Update gtkcssanimatedstyle.c

Add an early exit in the transition creation code when no transitions are given. In that case, both transition-duration and transition-delay are equal to their default value of 0, which means no transitions should run at all.

.gitlab-ci.yml

@@ -1,7 +1,7 @@
 stages:
   - build
   - flatpak
-  - deploy
+#  - deploy
 
 .cache-paths: &cache-paths
   paths:
@@ -13,15 +13,22 @@ stages:
     - subprojects/pango/
 
 fedora-x86_64:
-  image: registry.gitlab.gnome.org/gnome/gtk/master:v2
+  image: registry.gitlab.gnome.org/gnome/gtk/master:v6
   stage: build
   script:
     - bash -x ./.gitlab-ci/test-docker.sh
   artifacts:
-    when: on_failure
+    when: always
+    reports:
+      junit:
+        - "${CI_PROJECT_DIR}/_build/report.xml" 
     name: "gtk-${CI_COMMIT_REF_NAME}"
     paths:
       - "${CI_PROJECT_DIR}/_build/meson-logs"
+      - "${CI_PROJECT_DIR}/_build/report.xml"
+      - "${CI_PROJECT_DIR}/_build/report.html"
+      - "${CI_PROJECT_DIR}/_build/testsuite/reftests/output/*.png"
+      - "${CI_PROJECT_DIR}/_build/testsuite/gsk/compare/*/*.png"
   cache:
     key: "$CI_JOB_NAME"
     <<: *cache-paths
@@ -53,30 +60,60 @@ msys2-mingw32:
   script:
     - bash -x ./.gitlab-ci/flatpak-build.sh "${APPID}"
 
-flatpak:demo:
-  variables:
-    APPID: org.gtk.Demo
+# Manual jobs, for branches and MRs
+.flatpak-manual: &flatpak-manual
   <<: *flatpak-defaults
+  when: manual
 
-flatpak:widget-factory:
-  variables:
-    APPID: org.gtk.WidgetFactory
+# Only build Flatpak bundles automatically on master
+.flatpak-master: &flatpak-master
   <<: *flatpak-defaults
-
-pages:
-  image: registry.gitlab.gnome.org/gnome/gtk/master:v2
-  stage: deploy 
-  script:
-    - meson -Ddocumentation=true _build .
-    - ninja -C _build
-    - ninja -C _build gdk4-doc gsk4-doc gtk4-doc
-
-    - mkdir -p public/
-    - mv _build/docs/reference/gtk/html/ public/gtk/
-    - mv _build/docs/reference/gdk/html/ public/gdk/
-    - mv _build/docs/reference/gsk/html/ public/gsk/
-  artifacts:
-    paths:
-      - public
   only:
     - master
+
+flatpak-manual:demo:
+  variables:
+    APPID: org.gtk.Demo4
+  <<: *flatpak-manual
+
+flatpak-master:demo:
+  variables:
+    APPID: org.gtk.Demo4
+  <<: *flatpak-master
+
+flatpak-manual:widget-factory:
+  variables:
+    APPID: org.gtk.WidgetFactory4
+  <<: *flatpak-manual
+
+flatpak-master:widget-factory:
+  variables:
+    APPID: org.gtk.WidgetFactory4
+  <<: *flatpak-master
+
+flatpak-manual:icon-browser:
+  variables:
+    APPID: org.gtk.IconBrowser4
+  <<: *flatpak-manual
+
+flatpak-master:icon-browser:
+  variables:
+    APPID: org.gtk.IconBrowser4
+  <<: *flatpak-master
+
+#pages:
+#  image: registry.gitlab.gnome.org/gnome/gtk/master:v6
+#  stage: deploy 
+#  script:
+#    - meson -Dgtk_doc=true _build .
+#    - ninja -C _build
+#    - ninja -C _build gdk4-doc gsk4-doc gtk4-doc
+#    - mkdir -p public/
+#    - mv _build/docs/reference/gtk/html/ public/gtk/
+#    - mv _build/docs/reference/gdk/html/ public/gdk/
+#    - mv _build/docs/reference/gsk/html/ public/gsk/
+#  artifacts:
+#    paths:
+#      - public
+#  only:
+#    - master

.gitlab-ci/Dockerfile

@@ -1,4 +1,4 @@
-FROM fedora:29
+FROM fedora:30
 
 RUN dnf -y install \
     hicolor-icon-theme \
@@ -11,6 +11,8 @@ RUN dnf -y install \
     ccache \
     colord-devel \
     cups-devel \
+    dbus-daemon \
+    dejavu-sans-mono-fonts \
     desktop-file-utils \
     elfutils-libelf-devel \
     fribidi-devel \
@@ -58,6 +60,7 @@ RUN dnf -y install \
     pango-devel \
     pcre-devel \
     python3 \
+    python3-jinja2 \
     python3-pip \
     python3-wheel \
     redhat-rpm-config \
@@ -70,7 +73,7 @@ RUN dnf -y install \
     xorg-x11-server-Xvfb \
  && dnf clean all
 
-RUN pip3 install meson==0.49.0
+RUN pip3 install meson==0.50.1
 
 ARG HOST_USER_ID=5555
 ENV HOST_USER_ID ${HOST_USER_ID}

.gitlab-ci/meson-html-report.py

@@ -0,0 +1,363 @@
+#!/usr/bin/env python3
+
+# Turns a Mason testlog.json file into an HTML report
+#
+# Copyright 2019  GNOME Foundation
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Original author: Emmanuele Bassi
+
+import argparse
+import datetime
+import json
+import os
+import sys
+from jinja2 import Template
+
+REPORT_TEMPLATE = '''
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <title>{{ report.project_name }} Test Report</title>
+  <meta charset="utf-8" />
+  <style type="text/css">
+body {
+  background: white;
+  color: #333;
+  font-family: 'Cantarell', sans-serif;
+}
+
+h1 {
+  color: #333333;
+  font-size: 1.9em;
+  font-weight: normal;
+  margin-bottom: 1em;
+  border-bottom: 1px solid #333333;
+}
+
+header {
+  position: fixed;
+  padding-bottom: 12px;
+  margin-bottom: 24px;
+  background: rgba(255, 255, 255, 0.85);
+  box-shadow: 0 0 1px rgba(0, 0, 0, 0.15);
+  z-index: 500;
+  left: 0;
+  top: 0;
+  width: 100%;
+  color: rgba(0, 0, 0, 0.3);
+  transform: translateY(0px);
+  transition: .2s background-color, color;
+  box-sizing: border-box;
+  display: block;
+  visibility: visible;
+  text-align: center;
+}
+
+article {
+  padding-top: 200px;
+  margin: 2em;
+}
+
+div.report-meta {
+  width: auto;
+  border: 1px solid #ccc;
+  padding: .5em 2em;
+  color: #3c3c3c;
+}
+
+span.result {
+  font-weight: bold;
+}
+
+span.pass {
+  color: rgb(51, 209, 122);
+}
+
+span.skip {
+  color: rgb(255, 163, 72);
+}
+
+span.fail {
+  color: rgb(224, 27, 36);
+}
+
+span.xfail {
+  color: rgb(163, 71, 186);
+}
+
+div.result {
+  border-top: 1px solid #c0c0c0;
+  padding-top: 1em;
+  padding-bottom: 1em;
+  width: 100%;
+}
+
+div.result h4 {
+  border-bottom: 1px solid #c0c0c0;
+  margin-bottom: 0.7em;
+}
+
+pre {
+  color: #fafafa;
+  background-color: black;
+  border-radius: 6px;
+  box-shadow: 0px 5px 8px 0px rgba(0, 0, 0, 0.25);
+  font-family: monospace;
+  line-height: 1.2em;
+  border: none;
+  padding: 10px 1em;
+  font-size: 0.9em;
+  overflow: auto;
+  white-space: pre;
+  word-break: normal;
+  word-wrap: normal;
+}
+
+ul.passed li {
+  display: inline;
+}
+
+ul.passed li:after {
+  content: ",";
+}
+
+ul.passed li:last-child:after {
+  content: "";
+}
+
+ul.images {
+  padding-bottom: 1em;
+}
+
+ul.images li {
+  display: inline;
+}
+  </style>
+</head>
+<body>
+  <header>
+    <h1>{{ report.project_name }} :: Test Reports</h1>
+    <div class="report-meta">
+      <p><strong>Branch:</strong> {{ report.branch_name }}</p>
+      <p><strong>Date:</strong> <time datetime="{{ report.date.isoformat() }}">{{ report.locale_date }}</time></p>
+      {% if report.job_id %}<p><strong>Job ID:</strong> {{ report.job_id }}</p>{% endif %}
+    </div>
+  </header>
+
+  <article>
+    <section>
+      <div class="summary">
+        <h3>Summary</h3>
+        <ul>
+          <li><strong>Total units:</strong> {{ report.total_units }}</li>
+          <li><strong>Passed:</strong> {{ report.total_successes }}</li>
+          <li><strong>Failed:</strong> {{ report.total_failures }}</li>
+        </ul>
+      </div>
+    </section>
+
+    {% for suite_result in report.results_list %}
+    <section>
+      <div class="result">
+        <h3>Suite: {{ suite_result.suite_name }}</h3>
+        <ul>
+          <li><strong>Units:</strong> {{ suite_result.n_units }}</li>
+          <li><strong>Passed:</strong> {{ suite_result.n_successes }}</li>
+          <li><strong>Failed:</strong> {{ suite_result.n_failures }}</li>
+        </ul>
+
+        <div class="successes">
+          <h4>Passed</h4>
+          <ul class="passed">
+            {% for success in suite_result.successes if success.result == 'OK' %}
+            <li>{{ success.name }} - result: <span class="result pass">{{ success.result }}</li>
+            {% else %}
+            <li>None</li>
+            {% endfor %}
+          </ul>
+
+          <h4>Skipped</h4>
+          <ul>
+            {% for success in suite_result.successes if success.result == 'SKIP' %}
+            <li>{{ success.name }} - result: <span class="result skip">{{ success.result }}</li>
+            {% else %}
+            <li>None</li>
+            {% endfor %}
+          </ul>
+
+          <h4>Expected failures</h4>
+          <ul>
+          {% for success in suite_result.successes if success.result == 'EXPECTEDFAIL' %}
+            <li>{{ success.name }} - result: <span class="result xfail">{{ success.result }}</span><br/>
+            {% if success.stdout %}
+              Output: <pre>{{ success.stdout }}</pre>
+            {% endif %}
+            {% if success.image_data is defined %}
+              <ul class="images">
+                <li><img alt="ref" src="{{ success.image_data.ref }}" /></li>
+                <li><img alt="out" src="{{ success.image_data.out }}" /></li>
+                <li><img alt="diff" src="{{ success.image_data.diff }}" /></li>
+              </ul>
+            {% endif %}
+            </li>
+          {% else %}
+            <li>None</li>
+          {% endfor %}
+          </ul>
+        </div>
+
+        <div class="failures">
+          <h4>Failed</h4>
+          <ul class="failed">
+            {% for failure in suite_result.failures if failure.result == 'FAIL' %}
+            <li>{{ failure.name }} - result: <span class="result fail">{{ failure.result }}</span><br/>
+              {% if failure.stdout %}
+              Output: <pre>{{ failure.stdout }}</pre>
+              {% endif %}
+              {% if failure.image_data is defined %}
+              <ul class="images">
+                <li><img alt="ref" src="{{ failure.image_data.ref }}" /></li>
+                <li><img alt="out" src="{{ failure.image_data.out }}" /></li>
+                <li><img alt="diff" src="{{ failure.image_data.diff }}" /></li>
+              </ul>
+              {% endif %}
+            </li>
+            {% else %}
+            <li>None</li>
+            {% endfor %}
+          </ul>
+
+          <h4>Timed out</h4>
+          <ul class="failed">
+            {% for failure in suite_result.failures if failure.result == 'TIMEOUT' %}
+            <li>{{ failure.name }} - result: <span class="result fail">{{ failure.result }}</span><br/>
+              {% if failure.stdout %}
+              Output: <pre>{{ failure.stdout }}</pre>
+              {% endif %}
+            </li>
+            {% else %}
+            <li>None</li>
+            {% endfor %}
+          </ul>
+        </div>
+
+      </div>
+    </section>
+    {% endfor %}
+
+  </article>
+</body>
+</html>
+'''
+
+aparser = argparse.ArgumentParser(description='Turns a Meson test log into an HTML report')
+aparser.add_argument('--project-name', metavar='NAME',
+                     help='The project name',
+                     default='Unknown')
+aparser.add_argument('--job-id', metavar='ID',
+                     help='The job ID for the report',
+                     default=None)
+aparser.add_argument('--branch', metavar='NAME',
+                     help='Branch of the project being tested',
+                     default='master')
+aparser.add_argument('--output', metavar='FILE',
+                     help='The output HTML file, stdout by default',
+                     type=argparse.FileType('w', encoding='UTF-8'),
+                     default=sys.stdout)
+aparser.add_argument('--reftest-suite', metavar='NAME',
+                     help='The name of the reftests suite',
+                     default='reftest')
+aparser.add_argument('--reftest-output-dir', metavar='DIR',
+                     help='The output directory for reftests data',
+                     default=None)
+aparser.add_argument('infile', metavar='FILE',
+                     help='The input testlog.json, stdin by default',
+                     type=argparse.FileType('r', encoding='UTF-8'),
+                     default=sys.stdin)
+
+args = aparser.parse_args()
+
+outfile = args.output
+
+suites = {}
+for line in args.infile:
+    data = json.loads(line)
+    (full_suite, unit_name) = data['name'].split(' / ')
+    (project_name, suite_name) = full_suite.split(':')
+
+    unit = {
+        'project-name': project_name,
+        'suite': suite_name,
+        'name': unit_name,
+        'duration': data['duration'],
+        'returncode': data['returncode'],
+        'result': data['result'],
+        'stdout': data['stdout'],
+    }
+
+    if args.reftest_output_dir is not None and suite_name == args.reftest_suite:
+        filename = unit_name.split(' ')[1]
+        basename = os.path.splitext(filename)[0]
+
+        image_data = {
+            'ref': os.path.join(args.reftest_output_dir, '{}.ref.png'.format(basename)),
+            'out': os.path.join(args.reftest_output_dir, '{}.out.png'.format(basename)),
+            'diff': os.path.join(args.reftest_output_dir, '{}.diff.png'.format(basename)),
+        }
+
+        unit['image_data'] = image_data
+
+    units = suites.setdefault(full_suite, [])
+    units.append(unit)
+
+report = {}
+report['date'] = datetime.datetime.utcnow()
+report['locale_date'] = report['date'].strftime("%c")
+report['project_name'] = args.project_name
+report['job_id'] = args.job_id
+report['branch_name'] = args.branch
+report['total_successes'] = 0
+report['total_failures'] = 0
+report['total_units'] = 0
+report['results_list'] = []
+
+for name, units in suites.items():
+    (project_name, suite_name) = name.split(':')
+    print('Processing {} suite {}:'.format(project_name, suite_name))
+
+    def if_failed(unit):
+        if unit['result'] in ['FAIL', 'TIMEOUT']:
+            return True
+        return False
+
+    def if_succeded(unit):
+        if unit['result'] in ['OK', 'EXPECTEDFAIL', 'SKIP']:
+            return True
+        return False
+
+    successes = list(filter(if_succeded, units))
+    failures = list(filter(if_failed, units))
+
+    n_units = len(units)
+    n_successes = len(successes)
+    n_failures = len(failures)
+
+    report['total_units'] += n_units
+    report['total_successes'] += n_successes
+    report['total_failures'] += n_failures
+    print(' - {}: {} total, {} pass, {} fail'.format(suite_name, n_units, n_successes, n_failures))
+
+    suite_report = {
+        'suite_name': suite_name,
+        'n_units': n_units,
+        'successes': successes,
+        'n_successes': n_successes,
+        'failures': failures,
+        'n_failures': n_failures,
+    }
+    report['results_list'].append(suite_report)
+
+template = Template(REPORT_TEMPLATE)
+outfile.write(template.render({'report': report}))

.gitlab-ci/meson-junit-report.py

@@ -0,0 +1,109 @@
+#!/usr/bin/env python3
+
+# Turns a Meson testlog.json file into a JUnit XML report
+#
+# Copyright 2019  GNOME Foundation
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Original author: Emmanuele Bassi
+
+import argparse
+import datetime
+import json
+import os
+import sys
+import xml.etree.ElementTree as ET
+
+aparser = argparse.ArgumentParser(description='Turns a Meson test log into a JUnit report')
+aparser.add_argument('--project-name', metavar='NAME',
+                     help='The project name',
+                     default='unknown')
+aparser.add_argument('--job-id', metavar='ID',
+                     help='The job ID for the report',
+                     default='Unknown')
+aparser.add_argument('--branch', metavar='NAME',
+                     help='Branch of the project being tested',
+                     default='master')
+aparser.add_argument('--output', metavar='FILE',
+                     help='The output file, stdout by default',
+                     type=argparse.FileType('w', encoding='UTF-8'),
+                     default=sys.stdout)
+aparser.add_argument('infile', metavar='FILE',
+                     help='The input testlog.json, stdin by default',
+                     type=argparse.FileType('r', encoding='UTF-8'),
+                     default=sys.stdin)
+
+args = aparser.parse_args()
+
+outfile = args.output
+
+testsuites = ET.Element('testsuites')
+testsuites.set('id', '{}/{}'.format(args.job_id, args.branch))
+testsuites.set('package', args.project_name)
+testsuites.set('timestamp', datetime.datetime.utcnow().isoformat(timespec='minutes'))
+
+suites = {}
+for line in args.infile:
+    data = json.loads(line)
+    (full_suite, unit_name) = data['name'].split(' / ')
+    (project_name, suite_name) = full_suite.split(':')
+
+    duration = data['duration']
+    return_code = data['returncode']
+    log = data['stdout']
+
+    unit = {
+        'suite': suite_name,
+        'name': unit_name,
+        'duration': duration,
+        'returncode': return_code,
+        'stdout': log,
+    }
+
+    units = suites.setdefault(suite_name, [])
+    units.append(unit)
+
+for name, units in suites.items():
+    print('Processing suite {} (units: {})'.format(name, len(units)))
+
+    def if_failed(unit):
+        if unit['returncode'] != 0:
+            return True
+        return False
+
+    def if_succeded(unit):
+        if unit['returncode'] == 0:
+            return True
+        return False
+
+    successes = list(filter(if_succeded, units))
+    failures = list(filter(if_failed, units))
+    print(' - {}: {} pass, {} fail'.format(name, len(successes), len(failures)))
+
+    testsuite = ET.SubElement(testsuites, 'testsuite')
+    testsuite.set('name', '{}/{}'.format(args.project_name, name))
+    testsuite.set('tests', str(len(units)))
+    testsuite.set('errors', str(len(failures)))
+    testsuite.set('failures', str(len(failures)))
+
+    for unit in successes:
+        testcase = ET.SubElement(testsuite, 'testcase')
+        testcase.set('classname', '{}/{}'.format(args.project_name, unit['suite']))
+        testcase.set('name', unit['name'])
+        testcase.set('time', str(unit['duration']))
+
+    for unit in failures:
+        testcase = ET.SubElement(testsuite, 'testcase')
+        testcase.set('classname', '{}/{}'.format(args.project_name, unit['suite']))
+        testcase.set('name', unit['name'])
+        testcase.set('time', str(unit['duration']))
+
+        failure = ET.SubElement(testcase, 'failure')
+        failure.set('classname', '{}/{}'.format(args.project_name, unit['suite']))
+        failure.set('name', unit['name'])
+        failure.set('type', 'error')
+        failure.text = unit['stdout']
+
+output = ET.tostring(testsuites, encoding='unicode')
+outfile.write(output)

.gitlab-ci/run-docker.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-TAG="registry.gitlab.gnome.org/gnome/gtk/master:v2"
+TAG="registry.gitlab.gnome.org/gnome/gtk/master:v6"
 
 sudo docker build --build-arg HOST_USER_ID="$UID" --tag "${TAG}" \
     --file "Dockerfile" .

.gitlab-ci/test-docker.sh

@@ -16,6 +16,7 @@ meson \
         -Dwayland-backend=true \
         -Dbroadway-backend=true \
         -Dvulkan=yes \
+        --werror \
         _build $srcdir
 unset CCACHE_DISABLE
 
@@ -24,9 +25,30 @@ cd _build
 ninja
 ccache --show-stats
 
+set +e
+
 xvfb-run -a -s "-screen 0 1024x768x24" \
     meson test \
+        --timeout-multiplier 2 \
         --print-errorlogs \
         --suite=gtk \
-        --no-suite=gtk:gsk \
         --no-suite=gtk:a11y
+
+# Save the exit code
+exit_code=$?
+
+# We always want to run the report generators
+$srcdir/.gitlab-ci/meson-junit-report.py \
+        --project-name=gtk \
+        --job-id="${CI_JOB_NAME}" \
+        --output=report.xml \
+        meson-logs/testlog.json
+
+$srcdir/.gitlab-ci/meson-html-report.py \
+        --project-name=GTK \
+        --job-id="${CI_JOB_NAME}" \
+        --reftest-output-dir="testsuite/reftests/output" \
+        --output=report.html \
+        meson-logs/testlog.json
+
+exit $exit_code

.gitlab-ci/test-msys2.sh

@@ -42,10 +42,11 @@ ccache --zero-stats
 ccache --show-stats
 export CCACHE_DISABLE=true
 meson \
-    -Denable-x11-backend=false \
-    -Denable-wayland-backend=false \
-    -Denable-win32-backend=true \
+    -Dx11-backend=false \
+    -Dwayland-backend=false \
+    -Dwin32-backend=true \
     -Dvulkan=no \
+    --werror \
     _build
 unset CCACHE_DISABLE
 

.gitlab/issue_templates/Bug.md

@@ -7,8 +7,8 @@
 <!--
   You should try and reproduce with the demos applications available
   under the `demos` directory, or the test programs in the `tests` directory.
-  Alternatively, please attach a *small and self-contained* example that
-  exhibits the issue.
+  Alternatively, please attach a *small and self-contained* example
+  *written in C* that exhibits the issue.
 -->
 
 ## Current behavior
@@ -26,7 +26,7 @@
  - Which version of GTK you are using
  - What operating system and version
   - For Linux, which distribution
- - If you built GTK+ yourself, the list of options used to configure the build
+ - If you built GTK yourself, the list of options used to configure the build
 -->
 
 ## Additional information

.gitlab/issue_templates/Crash.md

@@ -16,7 +16,7 @@
  - Which version of GTK you are using
  - What operating system and version
   - for Linux, which distribution
- - If you built GTK+ yourself, the list of options used to configure the build
+ - If you built GTK yourself, the list of options used to configure the build
 -->
 
 ## Warnings

NEWS

@@ -1,3 +1,105 @@
+Overview of Changes in GTK+ 3.96.0
+==================================
+
+* DND has been refactored. There are now separate GdkDrag and GdkDrop
+  objects. This work is still incomplete
+
+* The GDK_SURFACE_SUBSURFACE surface type has been removed.
+
+* Use of child surfaces has been greatly reduced. This work is still
+  incomplete
+
+* The use of global coordinates in GDK apis has been reduced. This
+  work is still incomplete
+
+* Events have been simplified and are used just for input
+  - expose events have been replaced by a GdkSurface::render signal
+  - configure events have been replaced by a GdkSurface::size-changed signal
+  - map events have been replaced by a GdkSurface::mapped property
+  - gdk_event_handler_set has been replaced by a GdkSurface::event signal
+  - key events no longer contain a string
+  - events on unmapped widgets are ignored
+
+* Warping the pointer is no longer supported
+
+* The Wayland backend now uses the Settings portal for GtkSettings
+
+* The Wayland input module uses the text-input-unstable-v3 protocol
+
+* The Broadway backend has been rewritten to work well with GSK
+
+* The color chooser has a color picker
+
+* GtkApplication tracks screensaver state and has a ::query-end signal
+
+* The file chooser portal backend supports file filters
+
+* A number of list models have been introduced, for internal use
+  and as public api:
+  - GtkMapListModel
+  - GtkSliceListModel
+  - GtkSortListModel
+  - GtkSelectionModel
+  - GtkSingleSelection
+
+* Support for tabular menus and combo boxes has been dropped
+
+* Key themes are no longer supported
+
+* GtkInvisible has been dropped
+
+* A GtkRoot interface has been added that is currently implemented
+  just by GtkWindow. This work is incomplete
+
+* GtkWidgets can transform their children using projective linear
+  transformations. This functionality is available in CSS and
+  as GskTransform argument to gtk_widget_allocate. GtkFixed is
+  a container that exposes this functionality. For examples of this,
+  see the swing transition of GtkRevealer, the rotate transitions
+  of GtkStack or the Fixed Layout example in gtk-demo.
+
+* GtkEntry functionality has been moved into a new GtkText widget,
+  the GtkEditable interface has been expanded, and new a new
+  GtkPasswordEntry widget has been introduced.
+
+* Focus handling has been rewritten, and focus-change event
+  generation has been unified with crossing events.
+
+* All demos and settings schemas have been renamed to avoid collisions
+  with GTK3.
+
+* GtkWidget can now use a GtkLayoutManager for size allocation.
+  Layout managers can optionally use layout children holding layout
+  properties. A number of layout managers are available:
+  - GtkBinLayout
+  - GtkBoxLayout
+  - GtkGridLayout
+  - GtkFixedLayout
+  - GtkCustomLayout
+  More layout manager implementations will appear in the future.
+
+* GtkAssistant, GtkStack and GtkNotebook now have publicly
+  accessible page objects for their children. The page objects
+  are also exposed via a list model.
+
+* GtkContainer no longer supports child properties. All existing
+  child properties have been removed, converted to regular properties,
+  moved to layout properties or moved to child meta objects.
+
+* GtkListBox has gained a ::show-separators property that gets
+  translated into a CSS style class.
+
+* A number of X11-specific GtkWindow and GdkSurface apis have been
+  removed or changed to backend APIs.
+
+* GtkBuilder can specify object-valued properties inline.
+
+* The gtk4-builder-tool simplify command has gained a --3to4 option
+  to convert GTK3 ui files to GTK4.
+
+* The inspector can show child meta objects and layout properties.
+
+
 Overview of Changes in GTK+ 3.94.0
 ==================================
 

build-aux/flatpak/org.gtk.Demo4.json

@@ -1,5 +1,5 @@
 {
-    "app-id": "org.gtk.Demo",
+    "app-id": "org.gtk.Demo4",
     "runtime": "org.gnome.Platform",
     "runtime-version": "master",
     "sdk": "org.gnome.Sdk",
@@ -9,10 +9,9 @@
     "finish-args": [
         "--device=dri",
         "--share=ipc",
-        "--socket=x11",
+        "--socket=fallback-x11",
         "--socket=wayland",
-        "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*",
-        "--talk-name=ca.desrt.conf", "--env=DCONF_USER_CONFIG_DIR=.config/dconf"
+        "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*"
     ],
     "cleanup": [
         "/include",

build-aux/flatpak/org.gtk.IconBrowser4.json

@@ -0,0 +1,72 @@
+{
+    "app-id": "org.gtk.IconBrowser4",
+    "runtime": "org.gnome.Platform",
+    "runtime-version": "master",
+    "sdk": "org.gnome.Sdk",
+    "command": "gtk4-icon-browser",
+    "tags": ["devel", "development", "nightly"],
+    "desktop-file-name-prefix": "(Development) ",
+    "finish-args": [
+        "--device=dri",
+        "--share=ipc",
+        "--socket=fallback-x11",
+        "--socket=wayland",
+        "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*"
+    ],
+    "cleanup": [
+        "/include",
+        "/lib/pkgconfig", "/share/pkgconfig",
+        "/share/aclocal",
+        "/man", "/share/man", "/share/gtk-doc",
+        "*.la", ".a",
+        "/lib/girepository-1.0",
+        "/share/gir-1.0",
+        "/share/doc"
+    ],
+    "modules": [
+        {
+            "name" : "wayland",
+            "buildsystem" : "autotools",
+            "builddir" : true,
+            "config-opts" : [
+                "--disable-documentation"
+            ],
+            "sources" : [
+                {
+                    "type" : "git",
+                    "url" : "https://github.com/wayland-project/wayland.git"
+                }
+            ]
+        },
+        {
+            "name": "graphene",
+            "buildsystem": "meson",
+            "builddir": true,
+            "config-opts": [
+                "--libdir=/app/lib",
+                "-Dtests=false",
+                "-Dbenchmarks=false"
+            ],
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://github.com/ebassi/graphene.git"
+                }
+            ]
+        },
+        {
+            "name": "gtk",
+            "buildsystem": "meson",
+            "builddir": true,
+            "config-opts": [
+                "--libdir=/app/lib"
+            ],
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://gitlab.gnome.org/GNOME/gtk.git"
+                }
+            ]
+        }
+    ]
+}

build-aux/flatpak/org.gtk.WidgetFactory4.json

@@ -1,5 +1,5 @@
 {
-    "app-id": "org.gtk.WidgetFactory",
+    "app-id": "org.gtk.WidgetFactory4",
     "runtime": "org.gnome.Platform",
     "runtime-version": "master",
     "sdk": "org.gnome.Sdk",
@@ -9,10 +9,9 @@
     "finish-args": [
         "--device=dri",
         "--share=ipc",
-        "--socket=x11",
+        "--socket=fallback-x11",
         "--socket=wayland",
-        "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*",
-        "--talk-name=ca.desrt.conf", "--env=DCONF_USER_CONFIG_DIR=.config/dconf"
+        "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*"
     ],
     "cleanup": [
         "/include",

build-aux/meson/post-install.py

@@ -19,7 +19,7 @@ if 'DESTDIR' not in os.environ:
                     os.path.join(gtk_datadir, 'glib-2.0', 'schemas')])
 
     print('Updating icon cache...')
-    subprocess.call(['gtk-update-icon-cache', '-q', '-t' ,'-f',
+    subprocess.call(['gtk4-update-icon-cache', '-q', '-t' ,'-f',
                     os.path.join(gtk_datadir, 'icons', 'hicolor')])
 
     print('Updating module cache for print backends...')

config.h.meson

@@ -24,9 +24,6 @@
 /* Define to 1 if you have the <crt_externs.h> header file. */
 #mesondefine HAVE_CRT_EXTERNS_H
 
-/* Define to 1 if CUPS 1.6 API is available */
-#mesondefine HAVE_CUPS_API_1_6
-
 /* Define to 1 if you have the `dcgettext' function. */
 #mesondefine HAVE_DCGETTEXT
 
@@ -59,12 +56,6 @@
 /* Define if GStreamer support is available */
 #mesondefine HAVE_GSTREAMER
 
-/* Define to 1 if you have the `httpGetAuthString' function. */
-#mesondefine HAVE_HTTPGETAUTHSTRING
-
-/* Define if cups http_t authstring field is accessible */
-#mesondefine HAVE_HTTP_AUTHSTRING
-
 /* Define to 1 if you have the <inttypes.h> header file. */
 #mesondefine HAVE_INTTYPES_H
 
@@ -134,6 +125,9 @@
 /* Define to 1 if you have the <sys/param.h> header file. */
 #mesondefine HAVE_SYS_PARAM_H
 
+/* Have the sysprof-capture library */
+#mesondefine HAVE_SYSPROF_CAPTURE
+
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #mesondefine HAVE_SYS_STAT_H
 
@@ -244,9 +238,6 @@
 #endif
 
 
-/* Define to 1 if XInput 2.0 is available */
-#mesondefine XINPUT_2
-
 /* Define to 1 if XInput 2.2 is available */
 #mesondefine XINPUT_2_2
 
@@ -300,18 +291,10 @@
 
 #mesondefine GTK_PRINT_BACKENDS
 
+#mesondefine HAVE_CAIRO_SCRIPT_INTERPRETER
+
 #mesondefine HAVE_HARFBUZZ
 
 #mesondefine HAVE_PANGOFT
 
 #mesondefine ISO_CODES_PREFIX
-
-#mesondefine MALLOC_IS_ALIGNED16
-
-#mesondefine HAVE_POSIX_MEMALIGN
-
-#mesondefine HAVE_MEMALIGN
-
-#mesondefine HAVE_ALIGNED_ALLOC
-
-#mesondefine HAVE__ALIGNED_MALLOC

demos/constraint-editor/constraint-editor-application.c

@@ -0,0 +1,115 @@
+/*
+ * Copyright © 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#include "config.h"
+
+#include "constraint-editor-application.h"
+#include "constraint-editor-window.h"
+
+struct _ConstraintEditorApplication
+{
+  GtkApplication parent_instance;
+};
+
+G_DEFINE_TYPE(ConstraintEditorApplication, constraint_editor_application, GTK_TYPE_APPLICATION);
+
+static void
+constraint_editor_application_init (ConstraintEditorApplication *app)
+{
+}
+
+static void
+quit_activated (GSimpleAction *action,
+                GVariant      *parameter,
+                gpointer       data)
+{
+  g_application_quit (G_APPLICATION (data));
+}
+
+static GActionEntry app_entries[] =
+{
+  { "quit", quit_activated, NULL, NULL, NULL }
+};
+
+static void
+constraint_editor_application_startup (GApplication *app)
+{
+  const char *quit_accels[2] = { "<Ctrl>Q", NULL };
+  const char *open_accels[2] = { "<Ctrl>O", NULL };
+  GtkCssProvider *provider;
+
+  G_APPLICATION_CLASS (constraint_editor_application_parent_class)->startup (app);
+
+  g_action_map_add_action_entries (G_ACTION_MAP (app),
+                                   app_entries, G_N_ELEMENTS (app_entries),
+                                   app);
+  gtk_application_set_accels_for_action (GTK_APPLICATION (app), "app.quit", quit_accels);
+  gtk_application_set_accels_for_action (GTK_APPLICATION (app), "win.open", open_accels);
+
+  provider = gtk_css_provider_new ();
+  gtk_css_provider_load_from_resource (provider, "/org/gtk/gtk4/constraint-editor/constraint-editor.css");
+  gtk_style_context_add_provider_for_display (gdk_display_get_default (),
+                                              GTK_STYLE_PROVIDER (provider),
+                                              GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+}
+
+static void
+constraint_editor_application_activate (GApplication *app)
+{
+  ConstraintEditorWindow *win;
+
+  win = constraint_editor_window_new (CONSTRAINT_EDITOR_APPLICATION (app));
+  gtk_window_present (GTK_WINDOW (win));
+}
+
+static void
+constraint_editor_application_open (GApplication  *app,
+                                    GFile        **files,
+                                    gint           n_files,
+                                    const gchar   *hint)
+{
+  ConstraintEditorWindow *win;
+  gint i;
+
+  for (i = 0; i < n_files; i++)
+    {
+      win = constraint_editor_window_new (CONSTRAINT_EDITOR_APPLICATION (app));
+      constraint_editor_window_load (win, files[i]);
+      gtk_window_present (GTK_WINDOW (win));
+    }
+}
+
+static void
+constraint_editor_application_class_init (ConstraintEditorApplicationClass *class)
+{
+  GApplicationClass *application_class = G_APPLICATION_CLASS (class);
+
+  application_class->startup = constraint_editor_application_startup;
+  application_class->activate = constraint_editor_application_activate;
+  application_class->open = constraint_editor_application_open;
+}
+
+ConstraintEditorApplication *
+constraint_editor_application_new (void)
+{
+  return g_object_new (CONSTRAINT_EDITOR_APPLICATION_TYPE,
+                       "application-id", "org.gtk.gtk4.ConstraintEditor",
+                       "flags", G_APPLICATION_HANDLES_OPEN,
+                       NULL);
+}

demos/constraint-editor/constraint-editor-application.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright © 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#define CONSTRAINT_EDITOR_APPLICATION_TYPE (constraint_editor_application_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintEditorApplication, constraint_editor_application, CONSTRAINT, EDITOR_APPLICATION, GtkApplication)
+
+ConstraintEditorApplication *constraint_editor_application_new (void);

demos/constraint-editor/constraint-editor-window.c

@@ -0,0 +1,639 @@
+/*
+ * Copyright © 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#include "config.h"
+
+#include "constraint-editor-window.h"
+#include "constraint-view.h"
+#include "constraint-editor.h"
+#include "guide-editor.h"
+
+struct _ConstraintEditorWindow
+{
+  GtkApplicationWindow parent_instance;
+
+  GtkWidget *paned;
+  GtkWidget *view;
+  GtkWidget *list;
+};
+
+G_DEFINE_TYPE(ConstraintEditorWindow, constraint_editor_window, GTK_TYPE_APPLICATION_WINDOW);
+
+static GtkConstraintTarget *
+find_target (GListModel *model,
+             GtkConstraintTarget *orig)
+{
+  const char *name;
+  const char *model_name;
+  gpointer item;
+  int i;
+
+  if (orig == NULL)
+    return NULL;
+
+  if (GTK_IS_LABEL (orig))
+    name = gtk_label_get_label (GTK_LABEL (orig));
+  else if (GTK_IS_CONSTRAINT_GUIDE (orig))
+    name = gtk_constraint_guide_get_name (GTK_CONSTRAINT_GUIDE (orig));
+  else
+    {
+      g_warning ("Don't know how to handle %s targets", G_OBJECT_TYPE_NAME (orig));
+      return NULL;
+    }
+  for (i = 0; i < g_list_model_get_n_items (model); i++)
+    {
+      item = g_list_model_get_item (model, i);
+      g_object_unref (item);
+      if (GTK_IS_WIDGET (item))
+        model_name = gtk_widget_get_name (GTK_WIDGET (item));
+      else
+        model_name = gtk_constraint_guide_get_name (GTK_CONSTRAINT_GUIDE (item));
+
+      if (strcmp (name, model_name) == 0)
+        return GTK_CONSTRAINT_TARGET (item);
+    }
+  g_warning ("Failed to find target '%s'", name);
+
+  return NULL;
+}
+
+gboolean
+constraint_editor_window_load (ConstraintEditorWindow *self,
+                               GFile            *file)
+{
+  char *path;
+  GtkBuilder *builder;
+  GError *error = NULL;
+  GtkWidget *view;
+  GtkLayoutManager *layout;
+  GtkWidget *child;
+  const char *name;
+  gpointer item;
+  int i;
+  GListModel *list;
+
+  path = g_file_get_path (file);
+
+  builder = gtk_builder_new ();
+  if (!gtk_builder_add_from_file (builder, path, &error))
+    {
+      g_print ("Could not load %s: %s", path, error->message);
+      g_error_free (error);
+      g_free (path);
+      g_object_unref (builder);
+      return FALSE;
+    }
+
+  view = GTK_WIDGET (gtk_builder_get_object (builder, "view"));
+  if (!GTK_IS_BOX (view))
+    {
+      g_print ("Could not load %s: No GtkBox named 'view'", path);
+      g_free (path);
+      g_object_unref (builder);
+      return FALSE;
+    }
+  layout = gtk_widget_get_layout_manager (view);
+  if (!GTK_IS_CONSTRAINT_LAYOUT (layout))
+    {
+      g_print ("Could not load %s: Widget 'view' does not use GtkConstraintLayout", path);
+      g_free (path);
+      g_object_unref (builder);
+      return FALSE;
+    }
+
+  for (child = gtk_widget_get_first_child (view);
+       child;
+       child = gtk_widget_get_next_sibling (child))
+    {
+      if (!GTK_IS_LABEL (child))
+        {
+          g_print ("Skipping non-GtkLabel child\n");
+          continue;
+        }
+
+      name = gtk_label_get_label (GTK_LABEL (child));
+      constraint_view_add_child (CONSTRAINT_VIEW (self->view), name);
+    }
+
+  list = gtk_constraint_layout_observe_guides (GTK_CONSTRAINT_LAYOUT (layout));
+  for (i = 0; i < g_list_model_get_n_items (list); i++)
+    {
+      GtkConstraintGuide *guide, *clone;
+      int w, h;
+
+      item = g_list_model_get_item (list, i);
+      guide = GTK_CONSTRAINT_GUIDE (item);
+
+      /* need to clone here, to attach to the right targets */
+      clone = gtk_constraint_guide_new ();
+      gtk_constraint_guide_set_name (clone, gtk_constraint_guide_get_name (guide));
+      gtk_constraint_guide_set_strength (clone, gtk_constraint_guide_get_strength (guide));
+      gtk_constraint_guide_get_min_size (guide, &w, &h);
+      gtk_constraint_guide_set_min_size (clone, w, h);
+      gtk_constraint_guide_get_nat_size (guide, &w, &h);
+      gtk_constraint_guide_set_nat_size (clone, w, h);
+      gtk_constraint_guide_get_max_size (guide, &w, &h);
+      gtk_constraint_guide_set_max_size (clone, w, h);
+      constraint_view_add_guide (CONSTRAINT_VIEW (self->view), clone);
+      g_object_unref (guide);
+      g_object_unref (clone);
+    }
+  g_object_unref (list);
+
+  list = gtk_constraint_layout_observe_constraints (GTK_CONSTRAINT_LAYOUT (layout));
+  for (i = 0; i < g_list_model_get_n_items (list); i++)
+    {
+      GtkConstraint *constraint;
+      GtkConstraint *clone;
+      GtkConstraintTarget *target;
+      GtkConstraintTarget *source;
+
+      item = g_list_model_get_item (list, i);
+      constraint = GTK_CONSTRAINT (item);
+
+      target = gtk_constraint_get_target (constraint);
+      source = gtk_constraint_get_source (constraint);
+      clone = gtk_constraint_new (find_target (constraint_view_get_model (CONSTRAINT_VIEW (self->view)), target),
+                                  gtk_constraint_get_target_attribute (constraint),
+                                  gtk_constraint_get_relation (constraint),
+                                  find_target (constraint_view_get_model (CONSTRAINT_VIEW (self->view)), source),
+                                  gtk_constraint_get_target_attribute (constraint),
+                                  gtk_constraint_get_multiplier (constraint),
+                                  gtk_constraint_get_constant (constraint),
+                                  gtk_constraint_get_strength (constraint));
+
+      constraint_view_add_constraint (CONSTRAINT_VIEW (self->view), clone);
+
+      g_object_unref (constraint);
+      g_object_unref (clone);
+    }
+  g_object_unref (list);
+
+  g_free (path);
+  g_object_unref (builder);
+
+  return TRUE;
+}
+
+static void
+open_response_cb (GtkNativeDialog        *dialog,
+                  gint                    response,
+                  ConstraintEditorWindow *self)
+{
+  gtk_native_dialog_hide (dialog);
+
+  if (response == GTK_RESPONSE_ACCEPT)
+    {
+      GFile *file;
+
+      file = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (dialog));
+      constraint_editor_window_load (self, file);
+      g_object_unref (file);
+    }
+
+  gtk_native_dialog_destroy (dialog);
+}
+
+static void
+open_cb (GtkWidget              *button,
+         ConstraintEditorWindow *self)
+{
+  GtkFileChooserNative *dialog;
+
+  dialog = gtk_file_chooser_native_new ("Open file",
+                                        GTK_WINDOW (self),
+                                        GTK_FILE_CHOOSER_ACTION_OPEN,
+                                        "_Load",
+                                        "_Cancel");
+
+  gtk_native_dialog_set_modal (GTK_NATIVE_DIALOG (dialog), TRUE);
+  gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (dialog), ".");
+  g_signal_connect (dialog, "response", G_CALLBACK (open_response_cb), self);
+  gtk_native_dialog_show (GTK_NATIVE_DIALOG (dialog));
+}
+
+static void
+serialize_child (GString   *str,
+                 int        indent,
+                 GtkWidget *child)
+{
+  const char *name;
+
+  name = gtk_widget_get_name (child);
+  g_string_append_printf (str, "%*s<child>\n", indent, "");
+  g_string_append_printf (str, "%*s  <object class=\"GtkLabel\" id=\"%s\">\n", indent, "", name);
+  g_string_append_printf (str, "%*s    <property name=\"label\">%s</property>\n", indent, "", name);
+  g_string_append_printf (str, "%*s  </object>\n", indent, "");
+  g_string_append_printf (str, "%*s</child>\n", indent, "");
+}
+
+static char *
+serialize_model (GListModel *list)
+{
+  GString *str = g_string_new ("");
+  int i;
+
+  g_string_append (str, "<interface>\n");
+  g_string_append (str, "  <object class=\"GtkBox\" id=\"view\">\n");
+  g_string_append (str, "    <property name=\"layout-manager\">\n");
+  g_string_append (str, "      <object class=\"GtkConstraintLayout\">\n");
+  g_string_append (str, "        <constraints>\n");
+  for (i = 0; i < g_list_model_get_n_items (list); i++)
+    {
+      gpointer item = g_list_model_get_item (list, i);
+      g_object_unref (item);
+      if (GTK_IS_CONSTRAINT (item))
+        constraint_editor_serialize_constraint (str, 10, GTK_CONSTRAINT (item));
+      else if (GTK_IS_CONSTRAINT_GUIDE (item))
+        guide_editor_serialize_guide (str, 10, GTK_CONSTRAINT_GUIDE (item));
+    }
+  g_string_append (str, "        </constraints>\n");
+  g_string_append (str, "      </object>\n");
+  g_string_append (str, "    </property>\n");
+  for (i = 0; i < g_list_model_get_n_items (list); i++)
+    {
+      gpointer item = g_list_model_get_item (list, i);
+      g_object_unref (item);
+      if (GTK_IS_WIDGET (item))
+        serialize_child (str, 4, GTK_WIDGET (item));
+    }
+  g_string_append (str, "  </object>\n");
+  g_string_append (str, "</interface>\n");
+
+  return g_string_free (str, FALSE);
+}
+
+
+static void
+save_response_cb (GtkNativeDialog        *dialog,
+                  gint                    response,
+                  ConstraintEditorWindow *self)
+{
+  gtk_native_dialog_hide (dialog);
+
+  if (response == GTK_RESPONSE_ACCEPT)
+    {
+      GListModel *model;
+      char *text, *filename;
+      GError *error = NULL;
+
+      model = constraint_view_get_model (CONSTRAINT_VIEW (self->view));
+      text = serialize_model (model);
+
+      filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
+      if (!g_file_set_contents (filename, text, -1, &error))
+        {
+          GtkWidget *dialog;
+
+          dialog = gtk_message_dialog_new (GTK_WINDOW (gtk_widget_get_root (GTK_WIDGET (self))),
+                                           GTK_DIALOG_MODAL|GTK_DIALOG_DESTROY_WITH_PARENT,
+                                           GTK_MESSAGE_INFO,
+                                           GTK_BUTTONS_OK,
+                                           "Saving failed");
+          gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog),
+                                                    "%s", error->message);
+          g_signal_connect (dialog, "response", G_CALLBACK (gtk_widget_destroy), NULL);
+          gtk_widget_show (dialog);
+          g_error_free (error);
+        }
+      g_free (filename);
+    }
+
+  gtk_native_dialog_destroy (dialog);
+}
+
+static void
+save_cb (GtkWidget              *button,
+         ConstraintEditorWindow *self)
+{
+  GtkFileChooserNative *dialog;
+
+  dialog = gtk_file_chooser_native_new ("Save constraints",
+                                        GTK_WINDOW (gtk_widget_get_root (GTK_WIDGET (button))),
+                                        GTK_FILE_CHOOSER_ACTION_SAVE,
+                                        "_Save",
+                                        "_Cancel");
+
+  gtk_native_dialog_set_modal (GTK_NATIVE_DIALOG (dialog), TRUE);
+  gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (dialog), ".");
+  g_signal_connect (dialog, "response", G_CALLBACK (save_response_cb), self);
+  gtk_native_dialog_show (GTK_NATIVE_DIALOG (dialog));
+}
+
+static void
+constraint_editor_window_finalize (GObject *object)
+{
+  //ConstraintEditorWindow *self = (ConstraintEditorWindow *)object;
+
+  G_OBJECT_CLASS (constraint_editor_window_parent_class)->finalize (object);
+}
+
+static int child_counter;
+static int guide_counter;
+
+static void
+add_child (ConstraintEditorWindow *win)
+{
+  char *name;
+
+  child_counter++;
+  name = g_strdup_printf ("Child %d", child_counter);
+  constraint_view_add_child (CONSTRAINT_VIEW (win->view), name);
+  g_free (name);
+}
+
+static void
+add_guide (ConstraintEditorWindow *win)
+{
+  char *name;
+  GtkConstraintGuide *guide;
+
+  guide_counter++;
+  name = g_strdup_printf ("Guide %d", guide_counter);
+  guide = gtk_constraint_guide_new ();
+  gtk_constraint_guide_set_name (guide, name);
+  g_free (name);
+
+  constraint_view_add_guide (CONSTRAINT_VIEW (win->view), guide);
+}
+
+static void
+constraint_editor_done (ConstraintEditor *editor,
+                        GtkConstraint    *constraint,
+                        ConstraintEditorWindow *win)
+{
+  GtkConstraint *old_constraint;
+
+  g_object_get (editor, "constraint", &old_constraint, NULL);
+
+  if (old_constraint)
+    constraint_view_remove_constraint (CONSTRAINT_VIEW (win->view), old_constraint);
+
+  constraint_view_add_constraint (CONSTRAINT_VIEW (win->view), constraint);
+
+  g_clear_object (&old_constraint);
+
+  gtk_widget_destroy (gtk_widget_get_ancestor (GTK_WIDGET (editor), GTK_TYPE_WINDOW));
+}
+
+static void
+edit_constraint (ConstraintEditorWindow *win,
+                 GtkConstraint          *constraint)
+{
+  GtkWidget *window;
+  ConstraintEditor *editor;
+  GListModel *model;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_transient_for (GTK_WINDOW (window), GTK_WINDOW (win));
+  gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
+  if (constraint)
+    gtk_window_set_title (GTK_WINDOW (window), "Edit Constraint");
+  else
+    gtk_window_set_title (GTK_WINDOW (window), "Create Constraint");
+
+  model = constraint_view_get_model (CONSTRAINT_VIEW (win->view));
+
+  editor = constraint_editor_new (model, constraint);
+
+  gtk_container_add (GTK_CONTAINER (window), GTK_WIDGET (editor));
+
+  g_signal_connect (editor, "done", G_CALLBACK (constraint_editor_done), win);
+
+  gtk_widget_show (window);
+}
+
+static void
+add_constraint (ConstraintEditorWindow *win)
+{
+  edit_constraint (win, NULL);
+}
+
+static void
+guide_editor_done (GuideEditor            *editor,
+                   GtkConstraintGuide     *guide,
+                   ConstraintEditorWindow *win)
+{
+  gtk_widget_destroy (gtk_widget_get_ancestor (GTK_WIDGET (editor), GTK_TYPE_WINDOW));
+}
+
+static void
+edit_guide (ConstraintEditorWindow *win,
+            GtkConstraintGuide     *guide)
+{
+  GtkWidget *window;
+  GuideEditor *editor;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
+  gtk_window_set_transient_for (GTK_WINDOW (window), GTK_WINDOW (win));
+  gtk_window_set_title (GTK_WINDOW (window), "Edit Guide");
+
+  editor = guide_editor_new (guide);
+  gtk_container_add (GTK_CONTAINER (window), GTK_WIDGET (editor));
+
+  g_signal_connect (editor, "done", G_CALLBACK (guide_editor_done), win);
+  gtk_widget_show (window);
+}
+
+static void
+row_activated (GtkListBox *list,
+               GtkListBoxRow *row,
+               ConstraintEditorWindow *win)
+{
+  GObject *item;
+
+  item = G_OBJECT (g_object_get_data (G_OBJECT (row), "item"));
+
+  if (GTK_IS_CONSTRAINT (item))
+    edit_constraint (win, GTK_CONSTRAINT (item));
+  else if (GTK_IS_CONSTRAINT_GUIDE (item))
+    edit_guide (win, GTK_CONSTRAINT_GUIDE (item));
+}
+
+static void
+constraint_editor_window_class_init (ConstraintEditorWindowClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+  g_type_ensure (CONSTRAINT_VIEW_TYPE);
+
+  object_class->finalize = constraint_editor_window_finalize;
+
+  gtk_widget_class_set_template_from_resource (widget_class,
+                                               "/org/gtk/gtk4/constraint-editor/constraint-editor-window.ui");
+
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditorWindow, paned);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditorWindow, view);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditorWindow, list);
+
+  gtk_widget_class_bind_template_callback (widget_class, open_cb);
+  gtk_widget_class_bind_template_callback (widget_class, save_cb);
+  gtk_widget_class_bind_template_callback (widget_class, add_child);
+  gtk_widget_class_bind_template_callback (widget_class, add_guide);
+  gtk_widget_class_bind_template_callback (widget_class, add_constraint);
+  gtk_widget_class_bind_template_callback (widget_class, row_activated);
+}
+
+static void
+row_edit (GtkButton *button,
+          ConstraintEditorWindow *win)
+{
+  GtkWidget *row;
+  GObject *item;
+
+  row = gtk_widget_get_ancestor (GTK_WIDGET (button), GTK_TYPE_LIST_BOX_ROW);
+  item = (GObject *)g_object_get_data (G_OBJECT (row), "item");
+  if (GTK_IS_CONSTRAINT (item))
+    edit_constraint (win, GTK_CONSTRAINT (item));
+  else if (GTK_IS_CONSTRAINT_GUIDE (item))
+    edit_guide (win, GTK_CONSTRAINT_GUIDE (item));
+}
+
+static void
+mark_constraints_invalid (ConstraintEditorWindow *win,
+                          gpointer                removed)
+{
+  GtkWidget *child;
+  GObject *item;
+
+  for (child = gtk_widget_get_first_child (win->list);
+       child;
+       child = gtk_widget_get_next_sibling (child))
+    {
+      item = (GObject *)g_object_get_data (G_OBJECT (child), "item");
+      if (GTK_IS_CONSTRAINT (item))
+        {
+          GtkConstraint *constraint = GTK_CONSTRAINT (item);
+
+          if (gtk_constraint_get_target (constraint) == (GtkConstraintTarget *)removed ||
+              gtk_constraint_get_source (constraint) == (GtkConstraintTarget *)removed)
+            {
+              GtkWidget *button;
+              button = (GtkWidget *)g_object_get_data (G_OBJECT (child), "edit");
+              gtk_button_set_icon_name (GTK_BUTTON (button), "dialog-warning-symbolic");
+              gtk_widget_set_tooltip_text (button, "Constraint is invalid");
+            }
+        }
+    }
+}
+
+static void
+row_delete (GtkButton *button,
+            ConstraintEditorWindow *win)
+{
+  GtkWidget *row;
+  GObject *item;
+
+  row = gtk_widget_get_ancestor (GTK_WIDGET (button), GTK_TYPE_LIST_BOX_ROW);
+  item = (GObject *)g_object_get_data (G_OBJECT (row), "item");
+  if (GTK_IS_CONSTRAINT (item))
+    constraint_view_remove_constraint (CONSTRAINT_VIEW (win->view),
+                                       GTK_CONSTRAINT (item));
+  else if (GTK_IS_CONSTRAINT_GUIDE (item))
+    {
+      mark_constraints_invalid (win, item);
+      constraint_view_remove_guide (CONSTRAINT_VIEW (win->view),
+                                    GTK_CONSTRAINT_GUIDE (item));
+    }
+  else if (GTK_IS_WIDGET (item))
+    {
+      mark_constraints_invalid (win, item);
+      constraint_view_remove_child (CONSTRAINT_VIEW (win->view),
+                                    GTK_WIDGET (item));
+    }
+}
+
+static GtkWidget *
+create_widget_func (gpointer item,
+                    gpointer user_data)
+{
+  ConstraintEditorWindow *win = user_data;
+  const char *name;
+  char *freeme = NULL;
+  GtkWidget *row, *box, *label, *button;
+
+  if (GTK_IS_WIDGET (item))
+    name = gtk_widget_get_name (GTK_WIDGET (item));
+  else if (GTK_IS_CONSTRAINT_GUIDE (item))
+    name = gtk_constraint_guide_get_name (GTK_CONSTRAINT_GUIDE (item));
+  else if (GTK_IS_CONSTRAINT (item))
+    name = freeme = constraint_editor_constraint_to_string (GTK_CONSTRAINT (item));
+  else
+    name = "";
+
+  row = gtk_list_box_row_new ();
+  g_object_set_data_full (G_OBJECT (row), "item", g_object_ref (item), g_object_unref);
+  box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+  label = gtk_label_new (name);
+  if (GTK_IS_WIDGET (item) || GTK_IS_CONSTRAINT_GUIDE (item))
+    g_object_bind_property (item, "name",
+                            label, "label",
+                            G_BINDING_DEFAULT);
+  g_object_set (label, "margin", 10, NULL);
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_widget_set_hexpand (label, TRUE);
+  gtk_container_add (GTK_CONTAINER (row), box);
+  gtk_container_add (GTK_CONTAINER (box), label);
+
+  if (GTK_IS_CONSTRAINT (item) || GTK_IS_CONSTRAINT_GUIDE (item))
+    {
+      button = gtk_button_new_from_icon_name ("document-edit-symbolic");
+      gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
+      g_signal_connect (button, "clicked", G_CALLBACK (row_edit), win);
+      g_object_set_data (G_OBJECT (row), "edit", button);
+      gtk_container_add (GTK_CONTAINER (box), button);
+      button = gtk_button_new_from_icon_name ("edit-delete-symbolic");
+      gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
+      g_signal_connect (button, "clicked", G_CALLBACK (row_delete), win);
+      gtk_container_add (GTK_CONTAINER (box), button);
+    }
+  else if (GTK_IS_WIDGET (item))
+    {
+      button = gtk_button_new_from_icon_name ("edit-delete-symbolic");
+      gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
+      g_signal_connect (button, "clicked", G_CALLBACK (row_delete), win);
+      gtk_container_add (GTK_CONTAINER (box), button);
+    }
+
+  g_free (freeme);
+
+  return row;
+}
+
+static void
+constraint_editor_window_init (ConstraintEditorWindow *self)
+{
+  gtk_widget_init_template (GTK_WIDGET (self));
+
+  gtk_list_box_bind_model (GTK_LIST_BOX (self->list),
+                           constraint_view_get_model (CONSTRAINT_VIEW (self->view)),
+                           create_widget_func,
+                           self,
+                           NULL);
+}
+
+ConstraintEditorWindow *
+constraint_editor_window_new (ConstraintEditorApplication *application)
+{
+  return g_object_new (CONSTRAINT_EDITOR_WINDOW_TYPE,
+                       "application", application,
+                       NULL);
+}

demos/constraint-editor/constraint-editor-window.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2019 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include "constraint-editor-application.h"
+
+
+#define CONSTRAINT_EDITOR_WINDOW_TYPE (constraint_editor_window_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintEditorWindow, constraint_editor_window, CONSTRAINT, EDITOR_WINDOW, GtkApplicationWindow)
+
+ConstraintEditorWindow * constraint_editor_window_new  (ConstraintEditorApplication  *application);
+
+gboolean                 constraint_editor_window_load (ConstraintEditorWindow       *self,
+                                                        GFile                        *file);

demos/constraint-editor/constraint-editor-window.ui

@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <template class="ConstraintEditorWindow" parent="GtkApplicationWindow">
+    <style>
+      <class name="devel"/>
+    </style>
+    <property name="title" translatable="yes">GTK Constraint Editor</property>
+    <property name="default-width">1024</property>
+    <property name="default-height">768</property>
+    <child type="titlebar">
+      <object class="GtkHeaderBar" id="header">
+        <property name="title" translatable="yes">GTK Constraint Editor</property>
+        <property name="show-title-buttons">1</property>
+        <child type="start">
+          <object class="GtkButton">
+            <property name="icon-name">document-open-symbolic</property>
+            <property name="tooltip-text">Open ui file</property>
+            <signal name="clicked" handler="open_cb"/>
+          </object>
+        </child>
+        <child type="start">
+          <object class="GtkButton">
+            <property name="icon-name">document-save-symbolic</property>
+            <property name="tooltip-text">Save to ui file</property>
+            <signal name="clicked" handler="save_cb"/>
+          </object>
+        </child>
+      </object>
+    </child>
+    <child>
+      <object class="GtkPaned" id="paned">
+        <property name="orientation">horizontal</property>
+        <child>
+          <object class="GtkBox">
+            <property name="orientation">vertical</property>
+            <child>
+              <object class="GtkBox">
+                <property name="orientation">horizontal</property>
+                <child>
+                  <object class="GtkButton">
+                    <property name="label">Add Child</property>
+                    <signal name="clicked" handler="add_child" swapped="yes"/>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkButton">
+                    <property name="label">Add Guide</property>
+                    <signal name="clicked" handler="add_guide" swapped="yes"/>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkButton">
+                    <property name="label">Add Constraint</property>
+                    <signal name="clicked" handler="add_constraint" swapped="yes"/>
+                  </object>
+                </child>
+              </object>
+            </child>
+            <child>
+              <object class="GtkScrolledWindow">
+                <property name="hscrollbar-policy">never</property>
+                <property name="vscrollbar-policy">automatic</property>
+                <property name="vexpand">1</property>
+                <child>
+                  <object class="GtkListBox" id="list">
+                    <property name="show-separators">1</property>
+                    <property name="selection-mode">none</property>
+                    <signal name="row-activated" handler="row_activated"/>
+                  </object>
+                </child>
+              </object>
+            </child>
+          </object>
+        </child>
+        <child>
+          <object class="ConstraintView" id="view">
+          </object>
+        </child>
+      </object>
+    </child>
+  </template>
+</interface>

demos/constraint-editor/constraint-editor.c

@@ -0,0 +1,656 @@
+/*
+ * Copyright © 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#include "config.h"
+
+#include "constraint-editor.h"
+
+struct _ConstraintEditor
+{
+  GtkWidget parent_instance;
+
+  GtkWidget *grid;
+  GtkWidget *target;
+  GtkWidget *target_attr;
+  GtkWidget *relation;
+  GtkWidget *source;
+  GtkWidget *source_attr;
+  GtkWidget *multiplier;
+  GtkWidget *constant;
+  GtkWidget *strength;
+  GtkWidget *preview;
+  GtkWidget *button;
+
+  GtkConstraint *constraint;
+  GListModel *model;
+
+  gboolean constructed;
+};
+
+enum {
+  PROP_MODEL = 1,
+  PROP_CONSTRAINT,
+  LAST_PROP
+};
+
+static GParamSpec *pspecs[LAST_PROP];
+
+enum {
+  DONE,
+  LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL];
+
+G_DEFINE_TYPE(ConstraintEditor, constraint_editor, GTK_TYPE_WIDGET);
+
+static const char *
+get_target_name (GtkConstraintTarget *target)
+{
+  if (target == NULL)
+    return "super";
+  else if (GTK_IS_WIDGET (target))
+    return gtk_widget_get_name (GTK_WIDGET (target));
+  else if (GTK_IS_CONSTRAINT_GUIDE (target))
+    return gtk_constraint_guide_get_name (GTK_CONSTRAINT_GUIDE (target));
+  else
+    return "";
+}
+
+static void
+constraint_target_combo (GListModel *model,
+                         GtkWidget  *combo,
+                         gboolean    is_source)
+{
+  int i;
+
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "super", "Super");
+
+  if (model)
+    {
+      for (i = 0; i < g_list_model_get_n_items (model); i++)
+        {
+          GObject *item = g_list_model_get_object (model, i);
+          const char *name;
+
+          if (GTK_IS_CONSTRAINT (item))
+            continue;
+
+          name = get_target_name (GTK_CONSTRAINT_TARGET (item));
+
+          gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), name, name);
+          g_object_unref (item);
+        }
+    }
+}
+
+static void
+constraint_attribute_combo (GtkWidget *combo,
+                            gboolean is_source)
+{
+  if (is_source)
+    gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "none", "None");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "left", "Left");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "right", "Right");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "top", "Top");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "bottom", "Bottom");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "start", "Start");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "end", "End");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "width", "Width");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "height", "Height");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "center-x", "Center X");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "center-y", "Center Y");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "baseline", "Baseline");
+}
+
+static void
+constraint_relation_combo (GtkWidget *combo)
+{
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "le", "≤");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "eq", "=");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "ge", "≥");
+}
+
+static void
+constraint_strength_combo (GtkWidget *combo)
+{
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "weak", "Weak");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "medium", "Medium");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "strong", "Strong");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "required", "Required");
+}
+
+static gpointer
+get_target (GListModel *model,
+            const char *id)
+{
+  int i;
+
+  if (strcmp ("super", id) == 0)
+    return NULL;
+
+  for (i = 0; i < g_list_model_get_n_items (model); i++)
+    {
+      GObject *item = g_list_model_get_object (model, i);
+      g_object_unref (item);
+      if (GTK_IS_CONSTRAINT (item))
+        continue;
+      else if (GTK_IS_WIDGET (item))
+        {
+          if (strcmp (id, gtk_widget_get_name (GTK_WIDGET (item))) == 0)
+            return item;
+        }
+      else if (GTK_IS_CONSTRAINT_GUIDE (item))
+        {
+          if (strcmp (id, gtk_constraint_guide_get_name (GTK_CONSTRAINT_GUIDE (item))) == 0)
+            return item;
+        }
+    }
+
+  return NULL;
+}
+
+static GtkConstraintAttribute
+get_target_attr (const char *id)
+{
+  GtkConstraintAttribute attr;
+  GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_ATTRIBUTE);
+  GEnumValue *value = g_enum_get_value_by_nick (class, id);
+  attr = value->value;
+  g_type_class_unref (class);
+
+  return attr;
+}
+
+static const char *
+get_attr_nick (GtkConstraintAttribute attr)
+{
+  GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_ATTRIBUTE);
+  GEnumValue *value = g_enum_get_value (class, attr);
+  const char *nick = value->value_nick;
+  g_type_class_unref (class);
+
+  return nick;
+}
+
+static GtkConstraintRelation
+get_relation (const char *id)
+{
+  GtkConstraintRelation relation;
+  GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_RELATION);
+  GEnumValue *value = g_enum_get_value_by_nick (class, id);
+  relation = value->value;
+  g_type_class_unref (class);
+
+  return relation;
+}
+
+static const char *
+get_relation_nick (GtkConstraintRelation relation)
+{
+  GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_RELATION);
+  GEnumValue *value = g_enum_get_value (class, relation);
+  const char *nick = value->value_nick;
+  g_type_class_unref (class);
+
+  return nick;
+}
+
+static GtkConstraintStrength
+get_strength (const char *id)
+{
+  GtkConstraintStrength strength;
+  GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_STRENGTH);
+  GEnumValue *value = g_enum_get_value_by_nick (class, id);
+  strength = value->value;
+  g_type_class_unref (class);
+
+  return strength;
+}
+
+static const char *
+get_strength_nick (GtkConstraintStrength strength)
+{
+  GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_STRENGTH);
+  GEnumValue *value = g_enum_get_value (class, strength);
+  const char *nick = value->value_nick;
+  g_type_class_unref (class);
+
+  return nick;
+}
+
+void
+constraint_editor_serialize_constraint (GString       *str,
+                                        int            indent,
+                                        GtkConstraint *constraint)
+{
+  const char *target;
+  const char *target_attr;
+  const char *relation;
+  const char *source;
+  const char *source_attr;
+  double multiplier;
+  double constant;
+  const char *strength;
+
+  target = get_target_name (gtk_constraint_get_target (constraint));
+  target_attr = get_attr_nick (gtk_constraint_get_target_attribute (constraint));
+  relation = get_relation_nick (gtk_constraint_get_relation (constraint));
+  source = get_target_name (gtk_constraint_get_source (constraint));
+  source_attr = get_attr_nick (gtk_constraint_get_source_attribute (constraint));
+  multiplier = gtk_constraint_get_multiplier (constraint);
+  constant = gtk_constraint_get_constant (constraint);
+  strength = get_strength_nick (gtk_constraint_get_strength (constraint));
+
+  g_string_append_printf (str, "%*s<constraint target=\"%s\" target-attribute=\"%s\"\n", indent, "", target, target_attr);
+  g_string_append_printf (str, "%*s            relation=\"%s\"\n", indent, "", relation);
+  if (strcmp (source_attr, "none") != 0)
+    {
+      g_string_append_printf (str, "%*s            source=\"%s\" source-attribute=\"%s\"\n", indent, "", source, source_attr);
+      g_string_append_printf (str, "%*s            multiplier=\"%g\"\n", indent, "", multiplier);
+    }
+  g_string_append_printf (str, "%*s            constant=\"%g\"\n", indent, "", constant);
+  g_string_append_printf (str, "%*s            strength=\"%s\" />\n", indent, "", strength);
+}
+
+static void
+create_constraint (GtkButton        *button,
+                   ConstraintEditor *editor)
+{
+  const char *id;
+  gpointer target;
+  GtkConstraintAttribute target_attr;
+  gpointer source;
+  GtkConstraintAttribute source_attr;
+  GtkConstraintRelation relation;
+  double multiplier;
+  double constant;
+  int strength;
+  GtkConstraint *constraint;
+
+  id = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->target));
+  target = get_target (editor->model, id);
+  id = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->target_attr));
+  target_attr = get_target_attr (id);
+
+  id = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->source));
+  source = get_target (editor->model, id);
+  id = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->source_attr));
+  source_attr = get_target_attr (id);
+
+  id = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->relation));
+  relation = get_relation (id);
+
+  multiplier = g_ascii_strtod (gtk_editable_get_text (GTK_EDITABLE (editor->multiplier)), NULL);
+
+  constant = g_ascii_strtod (gtk_editable_get_text (GTK_EDITABLE (editor->constant)), NULL);
+
+  id = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->strength));
+  strength = get_strength (id);
+
+  constraint = gtk_constraint_new (target, target_attr,
+                                   relation,
+                                   source, source_attr,
+                                   multiplier,
+                                   constant,
+                                   strength);
+  g_signal_emit (editor, signals[DONE], 0, constraint);
+  g_object_unref (constraint);
+}
+
+static void
+source_attr_changed (ConstraintEditor *editor)
+{
+  const char *id;
+
+  id = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->source_attr));
+  if (strcmp (id, "none") == 0)
+    {
+      gtk_combo_box_set_active (GTK_COMBO_BOX (editor->source), -1);
+      gtk_editable_set_text (GTK_EDITABLE (editor->multiplier), "");
+      gtk_widget_set_sensitive (editor->source, FALSE);
+      gtk_widget_set_sensitive (editor->multiplier, FALSE);
+    }
+  else
+    {
+      gtk_widget_set_sensitive (editor->source, TRUE);
+      gtk_widget_set_sensitive (editor->multiplier, TRUE);
+    }
+}
+
+char *
+constraint_editor_constraint_to_string (GtkConstraint *constraint)
+{
+  GString *str;
+  const char *name;
+  const char *attr;
+  const char *relation;
+  double c, m;
+
+  str = g_string_new ("");
+
+  name = get_target_name (gtk_constraint_get_target (constraint));
+  attr = get_attr_nick (gtk_constraint_get_target_attribute (constraint));
+  relation = get_relation_nick (gtk_constraint_get_relation (constraint));
+
+  if (name == NULL)
+    name = "[ ]";
+
+  g_string_append_printf (str, "%s.%s %s ", name, attr, relation);
+
+  c = gtk_constraint_get_constant (constraint);
+
+  attr = get_attr_nick (gtk_constraint_get_source_attribute (constraint));
+  if (strcmp (attr, "none") != 0)
+    {
+      name = get_target_name (gtk_constraint_get_source (constraint));
+      m = gtk_constraint_get_multiplier (constraint);
+
+      if (name == NULL)
+        name = "[ ]";
+
+      g_string_append_printf (str, "%s.%s", name, attr);
+
+      if (m != 1.0)
+        g_string_append_printf (str, " × %g", m);
+
+      if (c > 0.0)
+        g_string_append_printf (str, " + %g", c);
+      else if (c < 0.0)
+        g_string_append_printf (str, " - %g", -c);
+    }
+  else
+    g_string_append_printf (str, "%g", c);
+
+  return g_string_free (str, FALSE);
+}
+
+static void
+update_preview (ConstraintEditor *editor)
+{
+  GString *str;
+  const char *name;
+  const char *attr;
+  char *relation;
+  const char *multiplier;
+  const char *constant;
+  double c, m;
+
+  if (!editor->constructed)
+    return;
+
+  str = g_string_new ("");
+
+  name = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->target));
+  attr = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->target_attr));
+  relation = gtk_combo_box_text_get_active_text (GTK_COMBO_BOX_TEXT (editor->relation));
+
+  if (name == NULL)
+    name = "[ ]";
+
+  g_string_append_printf (str, "%s.%s %s ", name, attr, relation);
+  g_free (relation);
+
+  constant = gtk_editable_get_text (GTK_EDITABLE (editor->constant));
+  c = g_ascii_strtod (constant, NULL);
+
+  attr = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->source_attr));
+  if (strcmp (attr, "none") != 0)
+    {
+      name = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->source));
+      multiplier = gtk_editable_get_text (GTK_EDITABLE (editor->multiplier));
+      m = g_ascii_strtod (multiplier, NULL);
+
+      if (name == NULL)
+        name = "[ ]";
+
+      g_string_append_printf (str, "%s.%s", name, attr);
+
+      if (m != 1.0)
+        g_string_append_printf (str, " × %g", m);
+
+      if (c > 0.0)
+        g_string_append_printf (str, " + %g", c);
+      else if (c < 0.0)
+        g_string_append_printf (str, " - %g", -c);
+    }
+  else
+    g_string_append_printf (str, "%g", c);
+
+  gtk_label_set_label (GTK_LABEL (editor->preview), str->str);
+
+  g_string_free (str, TRUE);
+}
+
+static void
+update_button (ConstraintEditor *editor)
+{
+  if (gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->target)) != NULL &&
+      gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->source)) != NULL)
+    gtk_widget_set_sensitive (editor->button, TRUE);
+  else
+    gtk_widget_set_sensitive (editor->button, FALSE);
+}
+
+static void
+constraint_editor_init (ConstraintEditor *editor)
+{
+  gtk_widget_init_template (GTK_WIDGET (editor));
+}
+
+static void
+constraint_editor_constructed (GObject *object)
+{
+  ConstraintEditor *editor = CONSTRAINT_EDITOR (object);
+
+  constraint_target_combo (editor->model, editor->target, FALSE);
+  constraint_attribute_combo (editor->target_attr, FALSE);
+  constraint_relation_combo (editor->relation);
+  constraint_target_combo (editor->model, editor->source, TRUE);
+  constraint_attribute_combo (editor->source_attr, TRUE);
+
+  constraint_strength_combo (editor->strength);
+
+  if (editor->constraint)
+    {
+      GtkConstraintTarget *target;
+      GtkConstraintAttribute attr;
+      GtkConstraintRelation relation;
+      GtkConstraintStrength strength;
+      const char *nick;
+      char *val;
+      double multiplier;
+      double constant;
+
+      target = gtk_constraint_get_target (editor->constraint);
+      nick = get_target_name (target);
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->target), nick);
+
+      attr = gtk_constraint_get_target_attribute (editor->constraint);
+      nick = get_attr_nick (attr);
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->target_attr), nick);
+
+      target = gtk_constraint_get_source (editor->constraint);
+      nick = get_target_name (target);
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->source), nick);
+
+      attr = gtk_constraint_get_source_attribute (editor->constraint);
+      nick = get_attr_nick (attr);
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->source_attr), nick);
+
+      relation = gtk_constraint_get_relation (editor->constraint);
+      nick = get_relation_nick (relation);
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->relation), nick);
+
+      multiplier = gtk_constraint_get_multiplier (editor->constraint);
+      val = g_strdup_printf ("%g", multiplier);
+      gtk_editable_set_text (GTK_EDITABLE (editor->multiplier), val);
+      g_free (val);
+
+      constant = gtk_constraint_get_constant (editor->constraint);
+      val = g_strdup_printf ("%g", constant);
+      gtk_editable_set_text (GTK_EDITABLE (editor->constant), val);
+      g_free (val);
+
+      strength = gtk_constraint_get_strength (editor->constraint);
+      nick = get_strength_nick (strength);
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->strength), nick);
+
+      gtk_button_set_label (GTK_BUTTON (editor->button), "Apply");
+    }
+  else
+    {
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->target_attr), "left");
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->source_attr), "left");
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->relation), "eq");
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->strength), "required");
+
+      gtk_editable_set_text (GTK_EDITABLE (editor->multiplier), "1.0");
+      gtk_editable_set_text (GTK_EDITABLE (editor->constant), "0.0");
+
+      gtk_button_set_label (GTK_BUTTON (editor->button), "Create");
+    }
+
+  editor->constructed = TRUE;
+  update_preview (editor);
+  update_button (editor);
+}
+
+static void
+constraint_editor_set_property (GObject      *object,
+                                guint         property_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  ConstraintEditor *self = CONSTRAINT_EDITOR (object);
+
+  switch (property_id)
+    {
+    case PROP_MODEL:
+      self->model = g_value_dup_object (value);
+      break;
+
+    case PROP_CONSTRAINT:
+      self->constraint = g_value_dup_object (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+constraint_editor_get_property (GObject    *object,
+                                guint       property_id,
+                                GValue     *value,
+                                GParamSpec *pspec)
+{
+  ConstraintEditor *self = CONSTRAINT_EDITOR (object);
+
+  switch (property_id)
+    {
+    case PROP_MODEL:
+      g_value_set_object (value, self->model);
+      break;
+
+    case PROP_CONSTRAINT:
+      g_value_set_object (value, self->constraint);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+constraint_editor_dispose (GObject *object)
+{
+  ConstraintEditor *self = (ConstraintEditor *)object;
+
+  g_clear_pointer (&self->grid, gtk_widget_unparent);
+  g_clear_object (&self->model);
+  g_clear_object (&self->constraint);
+
+  G_OBJECT_CLASS (constraint_editor_parent_class)->dispose (object);
+}
+
+static void
+constraint_editor_class_init (ConstraintEditorClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+  object_class->constructed = constraint_editor_constructed;
+  object_class->dispose = constraint_editor_dispose;
+  object_class->set_property = constraint_editor_set_property;
+  object_class->get_property = constraint_editor_get_property;
+
+  pspecs[PROP_CONSTRAINT] =
+    g_param_spec_object ("constraint", "constraint", "constraint",
+                         GTK_TYPE_CONSTRAINT,
+                         G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY);
+
+  pspecs[PROP_MODEL] =
+    g_param_spec_object ("model", "model", "model",
+                         G_TYPE_LIST_MODEL,
+                         G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY);
+
+  g_object_class_install_properties (object_class, LAST_PROP, pspecs);
+
+  signals[DONE] =
+    g_signal_new ("done",
+                  G_TYPE_FROM_CLASS (object_class),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  NULL,
+                  G_TYPE_NONE, 1, GTK_TYPE_CONSTRAINT);
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
+
+  gtk_widget_class_set_template_from_resource (widget_class,
+                                               "/org/gtk/gtk4/constraint-editor/constraint-editor.ui");
+
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, grid);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, target);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, target_attr);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, relation);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, source);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, source_attr);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, multiplier);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, constant);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, strength);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, preview);
+  gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, button);
+
+  gtk_widget_class_bind_template_callback (widget_class, update_preview);
+  gtk_widget_class_bind_template_callback (widget_class, update_button);
+  gtk_widget_class_bind_template_callback (widget_class, create_constraint);
+  gtk_widget_class_bind_template_callback (widget_class, source_attr_changed);
+}
+
+ConstraintEditor *
+constraint_editor_new (GListModel    *model,
+                       GtkConstraint *constraint)
+{
+  return g_object_new (CONSTRAINT_EDITOR_TYPE,
+                       "model", model,
+                       "constraint", constraint,
+                       NULL);
+}

demos/constraint-editor/constraint-editor.css

@@ -0,0 +1,12 @@
+constraintview {
+  background: black;
+  color: white;
+}
+
+constraintview .child {
+  background: red;
+}
+
+constraintview .guide {
+  background: blue;
+}

demos/constraint-editor/constraint-editor.gresource.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gresources>
+  <gresource prefix="/org/gtk/gtk4/constraint-editor">
+    <file preprocess="xml-stripblanks">constraint-editor-window.ui</file>
+    <file preprocess="xml-stripblanks">constraint-editor.ui</file>
+    <file preprocess="xml-stripblanks">guide-editor.ui</file>
+    <file>constraint-editor.css</file>
+  </gresource>
+</gresources>

demos/constraint-editor/constraint-editor.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2019 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#define CONSTRAINT_EDITOR_TYPE (constraint_editor_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintEditor, constraint_editor, CONSTRAINT, EDITOR, GtkWidget)
+
+ConstraintEditor * constraint_editor_new (GListModel    *model,
+                                          GtkConstraint *constraint);
+
+void constraint_editor_serialize_constraint (GString       *str,
+                                             int            indent,
+                                             GtkConstraint *constraint);
+char *constraint_editor_constraint_to_string (GtkConstraint *constraint);

demos/constraint-editor/constraint-editor.ui

@@ -0,0 +1,163 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <template class="ConstraintEditor" parent="GtkWidget">
+    <child>
+      <object class="GtkGrid" id="grid">
+        <property name="margin">20</property>
+        <property name="row-spacing">10</property>
+        <property name="column-spacing">10</property>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Target</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkComboBoxText" id="target">
+            <signal name="changed" handler="update_preview" swapped="yes"/>
+            <signal name="changed" handler="update_button" swapped="yes"/>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkComboBoxText" id="target_attr">
+            <signal name="changed" handler="update_preview" swapped="yes"/>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Relation</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">2</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkComboBoxText" id="relation">
+            <signal name="changed" handler="update_preview" swapped="yes"/>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">2</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Source</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">3</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkComboBoxText" id="source">
+            <signal name="changed" handler="update_preview" swapped="yes"/>
+            <signal name="changed" handler="update_button" swapped="yes"/>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">3</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkComboBoxText" id="source_attr">
+            <signal name="changed" handler="update_preview" swapped="yes"/>
+            <signal name="changed" handler="source_attr_changed" swapped="yes"/>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">3</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Multiplier</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">4</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkEntry" id="multiplier">
+            <signal name="changed" handler="update_preview" swapped="yes"/>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">4</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Constant</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">5</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkEntry" id="constant">
+            <signal name="changed" handler="update_preview" swapped="yes"/>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">5</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Strength</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">6</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkComboBoxText" id="strength">
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">6</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel" id="preview">
+            <property name="xalign">0</property>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">7</property>
+              <property name="column-span">2</property>
+            </layout>
+            <attributes>
+              <attribute name="scale" value="1.44"/>
+            </attributes>
+          </object>
+        </child>
+        <child>
+          <object class="GtkButton" id="button">
+            <property name="label">Create</property>
+            <signal name="clicked" handler="create_constraint"/>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">8</property>
+            </layout>
+          </object>
+        </child>
+      </object>
+    </child>
+  </template>
+</interface>

demos/constraint-editor/constraint-view-child.c

@@ -0,0 +1,93 @@
+/*
+ * Copyright © 2019 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#include "constraint-view-child.h"
+
+struct _ConstraintViewChild
+{
+  GObject parent_instance;
+
+  char *name;
+};
+
+enum {
+  PROP_NAME = 1,
+  LAST_PROP
+};
+
+static GParamSpec props[LAST_PROP];
+
+G_DEFINE_TYPE (ConstraintViewChild, constraint_view_child, G_TYPE_OBJECT)
+
+static void
+constraint_view_child_init (ConstraintViewChild *child)
+{
+}
+
+static void
+constraint_view_child_finalize (GObject *object)
+{
+  ConstraintViewChild *child = CONSTRAINT_VIEW_CHILD (object);
+
+  g_free (child->name);
+
+  G_OBJECT_CLASS (constraint_view_child_parent_class)->finalize (object);
+}
+
+static void
+constraint_view_child_set_property (GObject *object,
+                                    
+static void
+constraint_view_child_class_init (ConstraintViewChildClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->finalize = constraint_view_child_finalize;
+  object_class->get_property = constraint_view_child_get_property;
+  object_class->set_property = constraint_view_child_set_property;
+
+  props[PROP_NAME] =
+    g_param_spec_string ("name", "name", "name",
+                         NULL,
+                         G_PARAM_READWRITE);
+
+  g_object_class_install_properties (object_class, LAST_PROP, props);
+}
+
+#define CONSTRAINT_VIEW_CHILD_TYPE (constraint_view_get_type ())
+
+G_DECLARE_TYPE (ConstraintViewChild, constraint_view_child, CONSTRAINT, VIEW_CHILD, GObject)
+
+#define CONSTRAINT_VIEW_WIDGET_TYPE (constraint_view_widget_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintViewWidget, constraint_view_widget, CONSTRAINT, VIEW_WIDGET, ConstraintViewChild)
+
+ConstraintViewWidget * constraint_view_widget_new (void);
+
+#define CONSTRAINT_VIEW_GUIDE_TYPE (constraint_view_guide_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintViewGuide, constraint_view_guide, CONSTRAINT, VIEW_GUIDE, ConstraintViewChild)
+
+ConstraintViewGuide * constraint_view_guide_new (void);
+
+#define CONSTRAINT_VIEW_CONSTRAINT_TYPE (constraint_view_constraint_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintViewConstraint, constraint_view_constraint, CONSTRAINT, VIEW_CONSTRAINT, ConstraintViewChild)
+
+ConstraintViewGuide * constraint_view_constraint_new (void);

demos/constraint-editor/constraint-view-child.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2019 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#define CONSTRAINT_VIEW_CHILD_TYPE (constraint_view_get_type ())
+
+G_DECLARE_TYPE (ConstraintViewChild, constraint_view_child, CONSTRAINT, VIEW_CHILD, GObject)
+
+#define CONSTRAINT_VIEW_WIDGET_TYPE (constraint_view_widget_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintViewWidget, constraint_view_widget, CONSTRAINT, VIEW_WIDGET, ConstraintViewChild)
+
+ConstraintViewWidget * constraint_view_widget_new (void);
+
+#define CONSTRAINT_VIEW_GUIDE_TYPE (constraint_view_guide_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintViewGuide, constraint_view_guide, CONSTRAINT, VIEW_GUIDE, ConstraintViewChild)
+
+ConstraintViewGuide * constraint_view_guide_new (void);
+
+#define CONSTRAINT_VIEW_CONSTRAINT_TYPE (constraint_view_constraint_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintViewConstraint, constraint_view_constraint, CONSTRAINT, VIEW_CONSTRAINT, ConstraintViewChild)
+
+ConstraintViewGuide * constraint_view_constraint_new (void);

demos/constraint-editor/constraint-view.c

@@ -0,0 +1,343 @@
+/* Copyright (C) 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <gtk/gtk.h>
+#include "constraint-view.h"
+
+struct _ConstraintView
+{
+  GtkWidget parent;
+
+  GListModel *model;
+
+  GtkWidget *drag_widget;
+};
+
+G_DEFINE_TYPE (ConstraintView, constraint_view, GTK_TYPE_WIDGET);
+
+static void
+constraint_view_dispose (GObject *object)
+{
+  ConstraintView *view = CONSTRAINT_VIEW (object);
+  GtkWidget *child;
+
+  while ((child = gtk_widget_get_first_child (GTK_WIDGET (view))) != NULL)
+    gtk_widget_unparent (child);
+
+  g_clear_object (&view->model);
+
+  G_OBJECT_CLASS (constraint_view_parent_class)->dispose (object);
+}
+
+static void
+constraint_view_class_init (ConstraintViewClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  object_class->dispose = constraint_view_dispose;
+
+  gtk_widget_class_set_css_name (widget_class, "constraintview");
+}
+
+static void
+update_weak_position (ConstraintView *self,
+                      GtkWidget      *child,
+                      double          x,
+                      double          y)
+{
+  GtkLayoutManager *manager;
+  GtkConstraint *constraint;
+
+  manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
+  constraint = (GtkConstraint *)g_object_get_data (G_OBJECT (child), "x-constraint");
+  if (constraint)
+    {
+      gtk_constraint_layout_remove_constraint (GTK_CONSTRAINT_LAYOUT (manager),
+                                               constraint);
+      g_object_set_data (G_OBJECT (child), "x-constraint", NULL);
+    }
+  if (x != -100)
+    {
+      constraint = gtk_constraint_new_constant (child,
+                                                GTK_CONSTRAINT_ATTRIBUTE_CENTER_X,
+                                                GTK_CONSTRAINT_RELATION_EQ,
+                                                x,
+                                                GTK_CONSTRAINT_STRENGTH_WEAK);
+      g_object_set_data (G_OBJECT (constraint), "internal", "yes");
+      gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (manager),
+                                            constraint);
+      g_object_set_data (G_OBJECT (child), "x-constraint", constraint);
+    }
+
+  constraint = (GtkConstraint *)g_object_get_data (G_OBJECT (child), "y-constraint");
+  if (constraint)
+    {
+      gtk_constraint_layout_remove_constraint (GTK_CONSTRAINT_LAYOUT (manager),
+                                                   constraint);
+      g_object_set_data (G_OBJECT (child), "y-constraint", NULL);
+    }
+  if (y != -100)
+    {
+      constraint = gtk_constraint_new_constant (child,
+                                                GTK_CONSTRAINT_ATTRIBUTE_CENTER_Y,
+                                                GTK_CONSTRAINT_RELATION_EQ,
+                                                y,
+                                                GTK_CONSTRAINT_STRENGTH_WEAK);
+      g_object_set_data (G_OBJECT (constraint), "internal", "yes");
+      gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (manager),
+                                            constraint);
+      g_object_set_data (G_OBJECT (child), "y-constraint", constraint);
+    }
+}
+
+static void
+drag_begin (GtkGestureDrag *drag,
+            double          start_x,
+            double          start_y,
+            ConstraintView *self)
+{
+  GtkWidget *widget;
+
+  widget = gtk_widget_pick (GTK_WIDGET (self), start_x, start_y, GTK_PICK_DEFAULT);
+
+  if (GTK_IS_LABEL (widget))
+    {
+      widget = gtk_widget_get_ancestor (widget, GTK_TYPE_FRAME);
+      if (widget &&
+          gtk_widget_get_parent (widget) == (GtkWidget *)self)
+        {
+          self->drag_widget = widget;
+        }
+    }
+}
+
+static void
+drag_update (GtkGestureDrag *drag,
+             double          offset_x,
+             double          offset_y,
+             ConstraintView *self)
+{
+  double x, y;
+
+  if (!self->drag_widget)
+    return;
+
+  gtk_gesture_drag_get_start_point (drag, &x, &y);
+  update_weak_position (self, self->drag_widget, x + offset_x, y + offset_y);
+}
+
+static void
+drag_end (GtkGestureDrag *drag,
+          double          offset_x,
+          double          offset_y,
+          ConstraintView *self)
+{
+  self->drag_widget = NULL;
+}
+
+static gboolean
+omit_internal (gpointer item, gpointer user_data)
+{
+  if (g_object_get_data (G_OBJECT (item), "internal"))
+    return FALSE;
+
+  return TRUE;
+}
+
+static void
+constraint_view_init (ConstraintView *self)
+{
+  GtkLayoutManager *manager;
+  GtkEventController *controller;
+  GListStore *list;
+  GListModel *all_children;
+  GListModel *all_constraints;
+  GListModel *guides;
+  GListModel *children;
+  GListModel *constraints;
+
+  manager = gtk_constraint_layout_new ();
+  gtk_widget_set_layout_manager (GTK_WIDGET (self), manager);
+
+  all_children = gtk_widget_observe_children (GTK_WIDGET (self));
+  all_constraints = gtk_constraint_layout_observe_constraints (GTK_CONSTRAINT_LAYOUT (manager));
+  guides = gtk_constraint_layout_observe_guides (GTK_CONSTRAINT_LAYOUT (manager));
+  constraints = (GListModel *)gtk_filter_list_model_new (all_constraints, omit_internal, NULL, NULL);
+  children = (GListModel *)gtk_filter_list_model_new (all_children, omit_internal, NULL, NULL);
+
+  list = g_list_store_new (G_TYPE_LIST_MODEL);
+  g_list_store_append (list, children);
+  g_list_store_append (list, guides);
+  g_list_store_append (list, constraints);
+  self->model = G_LIST_MODEL (gtk_flatten_list_model_new (G_TYPE_OBJECT, G_LIST_MODEL (list)));
+  g_object_unref (children);
+  g_object_unref (guides);
+  g_object_unref (constraints);
+  g_object_unref (all_children);
+  g_object_unref (all_constraints);
+  g_object_unref (list);
+
+
+  controller = (GtkEventController *)gtk_gesture_drag_new ();
+  g_signal_connect (controller, "drag-begin", G_CALLBACK (drag_begin), self);
+  g_signal_connect (controller, "drag-update", G_CALLBACK (drag_update), self);
+  g_signal_connect (controller, "drag-end", G_CALLBACK (drag_end), self);
+  gtk_widget_add_controller (GTK_WIDGET (self), controller);
+}
+
+ConstraintView *
+constraint_view_new (void)
+{
+  return g_object_new (CONSTRAINT_VIEW_TYPE, NULL);
+}
+
+void
+constraint_view_add_child (ConstraintView *view,
+                           const char     *name)
+{
+  GtkWidget *frame;
+  GtkWidget *label;
+
+  label = gtk_label_new (name);
+  frame = gtk_frame_new (NULL);
+  gtk_style_context_add_class (gtk_widget_get_style_context (frame), "child");
+  gtk_widget_set_name (frame, name);
+  gtk_container_add (GTK_CONTAINER (frame), label);
+  gtk_widget_set_parent (frame, GTK_WIDGET (view));
+
+  update_weak_position (view, frame, 100, 100);
+}
+
+void
+constraint_view_remove_child (ConstraintView *view,
+                              GtkWidget      *child)
+{
+  update_weak_position (view, child, -100, -100);
+  gtk_widget_unparent (child);
+}
+
+void
+constraint_view_add_guide (ConstraintView *view,
+                           GtkConstraintGuide *guide)
+{
+  GtkConstraintLayout *layout;
+  GtkWidget *frame;
+  GtkWidget *label;
+  const char *name;
+  GtkConstraint *constraint;
+  struct {
+    const char *name;
+    GtkConstraintAttribute attr;
+  } names[] = {
+    { "left-constraint", GTK_CONSTRAINT_ATTRIBUTE_LEFT },
+    { "top-constraint", GTK_CONSTRAINT_ATTRIBUTE_TOP },
+    { "width-constraint", GTK_CONSTRAINT_ATTRIBUTE_WIDTH },
+    { "height-constraint", GTK_CONSTRAINT_ATTRIBUTE_HEIGHT },
+  };
+  int i;
+
+  name = gtk_constraint_guide_get_name (guide);
+  label = gtk_label_new (name);
+  g_object_bind_property (guide, "name",
+                          label, "label",
+                          G_BINDING_DEFAULT);
+
+  frame = gtk_frame_new (NULL);
+  gtk_style_context_add_class (gtk_widget_get_style_context (frame), "guide");
+  g_object_set_data (G_OBJECT (frame), "internal", "yes");
+  gtk_container_add (GTK_CONTAINER (frame), label);
+  gtk_widget_insert_after (frame, GTK_WIDGET (view), NULL);
+
+  g_object_set_data (G_OBJECT (guide), "frame", frame);
+
+  layout = GTK_CONSTRAINT_LAYOUT (gtk_widget_get_layout_manager (GTK_WIDGET (view)));
+  gtk_constraint_layout_add_guide (layout, g_object_ref (guide));
+
+  for (i = 0; i < G_N_ELEMENTS (names); i++)
+    {
+      constraint = gtk_constraint_new (frame,
+                                       names[i].attr,
+                                       GTK_CONSTRAINT_RELATION_EQ,
+                                       guide,
+                                       names[i].attr,
+                                       1.0, 0.0,
+                                       GTK_CONSTRAINT_STRENGTH_REQUIRED);
+      g_object_set_data (G_OBJECT (constraint), "internal", "yes");
+      gtk_constraint_layout_add_constraint (layout, constraint);
+      g_object_set_data (G_OBJECT (guide), names[i].name, constraint);
+    }
+
+  update_weak_position (view, frame, 150, 150);
+}
+
+void
+constraint_view_remove_guide (ConstraintView     *view,
+                              GtkConstraintGuide *guide)
+{
+  GtkConstraintLayout *layout;
+  GtkWidget *frame;
+  GtkConstraint *constraint;
+  const char *names[] = {
+    "left-constraint",
+    "top-constraint",
+    "width-constraint",
+    "height-constraint"
+  };
+  int i;
+
+  layout = GTK_CONSTRAINT_LAYOUT (gtk_widget_get_layout_manager (GTK_WIDGET (view)));
+
+  for (i = 0; i < G_N_ELEMENTS (names); i++)
+    {
+      constraint = (GtkConstraint*)g_object_get_data (G_OBJECT (guide), names[i]);
+      gtk_constraint_layout_remove_constraint (layout, constraint);
+    }
+
+  frame = (GtkWidget *)g_object_get_data (G_OBJECT (guide), "frame");
+  update_weak_position (view, frame, -100, -100);
+  gtk_widget_unparent (frame);
+
+  gtk_constraint_layout_remove_guide (layout, guide);
+}
+
+void
+constraint_view_add_constraint (ConstraintView *view,
+                                GtkConstraint  *constraint)
+{
+  GtkLayoutManager *manager;
+
+  manager = gtk_widget_get_layout_manager (GTK_WIDGET (view));
+  gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (manager),
+                                        g_object_ref (constraint));
+}
+
+void
+constraint_view_remove_constraint (ConstraintView *view,
+                                   GtkConstraint  *constraint)
+{
+  GtkLayoutManager *manager;
+
+  manager = gtk_widget_get_layout_manager (GTK_WIDGET (view));
+  gtk_constraint_layout_remove_constraint (GTK_CONSTRAINT_LAYOUT (manager),
+                                           constraint);
+}
+
+GListModel *
+constraint_view_get_model (ConstraintView *view)
+{
+  return view->model;
+}

demos/constraint-editor/constraint-view.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2019 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#define CONSTRAINT_VIEW_TYPE (constraint_view_get_type ())
+
+G_DECLARE_FINAL_TYPE (ConstraintView, constraint_view, CONSTRAINT, VIEW, GtkWidget)
+
+ConstraintView * constraint_view_new (void);
+
+void             constraint_view_add_child (ConstraintView *view,
+                                            const char     *name);
+void             constraint_view_remove_child (ConstraintView *view,
+                                               GtkWidget      *child);
+void             constraint_view_add_guide (ConstraintView     *view,
+                                            GtkConstraintGuide *guide);
+void             constraint_view_remove_guide (ConstraintView     *view,
+                                               GtkConstraintGuide *guide);
+void             constraint_view_guide_changed (ConstraintView     *view,
+                                                GtkConstraintGuide *guide);
+void             constraint_view_add_constraint (ConstraintView *view,
+                                                 GtkConstraint  *constraint);
+void             constraint_view_remove_constraint (ConstraintView *view,
+                                                    GtkConstraint  *constraint);
+GListModel *     constraint_view_get_model (ConstraintView *view);

demos/constraint-editor/guide-editor.c

@@ -0,0 +1,411 @@
+/*
+ * Copyright © 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#include "config.h"
+
+#include "guide-editor.h"
+
+struct _GuideEditor
+{
+  GtkWidget parent_instance;
+
+  GtkWidget *grid;
+  GtkWidget *name;
+  GtkWidget *min_width;
+  GtkWidget *min_height;
+  GtkWidget *nat_width;
+  GtkWidget *nat_height;
+  GtkWidget *max_width;
+  GtkWidget *max_height;
+  GtkWidget *strength;
+  GtkWidget *button;
+
+  GtkConstraintGuide *guide;
+
+  gboolean constructed;
+};
+
+enum {
+  PROP_GUIDE = 1,
+  LAST_PROP
+};
+
+static GParamSpec *pspecs[LAST_PROP];
+
+enum {
+  DONE,
+  LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL];
+
+G_DEFINE_TYPE(GuideEditor, guide_editor, GTK_TYPE_WIDGET);
+
+static void
+guide_strength_combo (GtkWidget *combo)
+{
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "weak", "Weak");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "medium", "Medium");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "strong", "Strong");
+  gtk_combo_box_text_append (GTK_COMBO_BOX_TEXT (combo), "required", "Required");
+}
+
+static GtkConstraintStrength
+get_strength (const char *id)
+{
+  GtkConstraintStrength strength;
+  GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_STRENGTH);
+  GEnumValue *value = g_enum_get_value_by_nick (class, id);
+  strength = value->value;
+  g_type_class_unref (class);
+
+  return strength;
+}
+
+const char *
+get_strength_nick (GtkConstraintStrength strength)
+{
+  GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_STRENGTH);
+  GEnumValue *value = g_enum_get_value (class, strength);
+  const char *nick = value->value_nick;
+  g_type_class_unref (class);
+
+  return nick;
+}
+
+void
+guide_editor_serialize_guide (GString *str,
+                              int      indent,
+                              GtkConstraintGuide *guide)
+{
+  int min_width, min_height;
+  int nat_width, nat_height;
+  int max_width, max_height;
+  const char *name;
+  const char *strength;
+
+  gtk_constraint_guide_get_min_size (guide, &min_width, &min_height);
+  gtk_constraint_guide_get_nat_size (guide, &nat_width, &nat_height);
+  gtk_constraint_guide_get_max_size (guide, &max_width, &max_height);
+  name = gtk_constraint_guide_get_name (guide);
+  strength = get_strength_nick (gtk_constraint_guide_get_strength (guide));
+
+  g_string_append_printf (str, "%*s<guide min-width=\"%d\" min-height=\"%d\"\n", indent, "", min_width, min_height);
+  g_string_append_printf (str, "%*s       nat-width=\"%d\" nat-height=\"%d\"\n", indent, "", nat_width, nat_height);
+  g_string_append_printf (str, "%*s       max-width=\"%d\" max-height=\"%d\"\n", indent, "", max_width, max_height);
+  g_string_append_printf (str, "%*s       name=\"%s\" strength=\"%s\" />\n", indent, "", name, strength);
+}
+
+static void
+create_guide (GtkButton   *button,
+              GuideEditor *editor)
+{
+  const char *id;
+  int strength;
+  const char *name;
+  int w, h;
+  GtkConstraintGuide *guide;
+
+  if (editor->guide)
+    guide = g_object_ref (editor->guide);
+  else
+    guide = gtk_constraint_guide_new ();
+
+  name = gtk_editable_get_text (GTK_EDITABLE (editor->name));
+  gtk_constraint_guide_set_name (guide, name);
+
+  w = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (editor->min_width));
+  h = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (editor->min_height));
+  gtk_constraint_guide_set_min_size (guide, w, h);
+
+  w = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (editor->nat_width));
+  h = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (editor->nat_height));
+  gtk_constraint_guide_set_nat_size (guide, w, h);
+
+  w = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (editor->max_width));
+  h = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (editor->max_height));
+  gtk_constraint_guide_set_max_size (guide, w, h);
+
+  id = gtk_combo_box_get_active_id (GTK_COMBO_BOX (editor->strength));
+  strength = get_strength (id);
+  gtk_constraint_guide_set_strength (guide, strength);
+
+  g_signal_emit (editor, signals[DONE], 0, guide);
+  g_object_unref (guide);
+}
+
+static void
+guide_editor_init (GuideEditor *editor)
+{
+  gtk_widget_init_template (GTK_WIDGET (editor));
+}
+
+static int guide_counter;
+
+static int
+min_input (GtkSpinButton *spin_button,
+           double        *new_val)
+{
+  if (strcmp (gtk_editable_get_text (GTK_EDITABLE (spin_button)), "") == 0)
+    {
+      *new_val = 0.0;
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static int
+max_input (GtkSpinButton *spin_button,
+           double        *new_val)
+{
+  if (strcmp (gtk_editable_get_text (GTK_EDITABLE (spin_button)), "") == 0)
+    {
+      *new_val = G_MAXINT;
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static gboolean
+min_output (GtkSpinButton *spin_button)
+{
+  GtkAdjustment *adjustment;
+  double value;
+  GtkWidget *box, *text;
+
+  adjustment = gtk_spin_button_get_adjustment (spin_button);
+  value = gtk_adjustment_get_value (adjustment);
+
+  box = gtk_widget_get_first_child (GTK_WIDGET (spin_button));
+  text = gtk_widget_get_first_child (box);
+
+  if (value == 0.0)
+    {
+      gtk_editable_set_text (GTK_EDITABLE (spin_button), "");
+      gtk_text_set_placeholder_text (GTK_TEXT (text), "unset");
+      return TRUE;
+    }
+  else
+    {
+      gtk_text_set_placeholder_text (GTK_TEXT (text), "");
+      return FALSE;
+    }
+}
+
+static gboolean
+max_output (GtkSpinButton *spin_button)
+{
+  GtkAdjustment *adjustment;
+  double value;
+  GtkWidget *box, *text;
+
+  adjustment = gtk_spin_button_get_adjustment (spin_button);
+  value = gtk_adjustment_get_value (adjustment);
+
+  box = gtk_widget_get_first_child (GTK_WIDGET (spin_button));
+  text = gtk_widget_get_first_child (box);
+
+  if (value == (double)G_MAXINT)
+    {
+      gtk_editable_set_text (GTK_EDITABLE (spin_button), "");
+      gtk_text_set_placeholder_text (GTK_TEXT (text), "unset");
+      return TRUE;
+    }
+  else
+    {
+      gtk_text_set_placeholder_text (GTK_TEXT (text), "");
+      return FALSE;
+    }
+}
+
+static void
+guide_editor_constructed (GObject *object)
+{
+  GuideEditor *editor = GUIDE_EDITOR (object);
+
+  guide_strength_combo (editor->strength);
+
+  g_signal_connect (editor->min_width, "input", G_CALLBACK (min_input), NULL);
+  g_signal_connect (editor->min_width, "output", G_CALLBACK (min_output), NULL);
+
+  g_signal_connect (editor->min_height, "input", G_CALLBACK (min_input), NULL);
+  g_signal_connect (editor->min_height, "output", G_CALLBACK (min_output), NULL);
+
+  g_signal_connect (editor->max_width, "input", G_CALLBACK (max_input), NULL);
+  g_signal_connect (editor->max_width, "output", G_CALLBACK (max_output), NULL);
+
+  g_signal_connect (editor->max_height, "input", G_CALLBACK (max_input), NULL);
+  g_signal_connect (editor->max_height, "output", G_CALLBACK (max_output), NULL);
+
+  if (editor->guide)
+    {
+      GtkConstraintStrength strength;
+      const char *nick;
+      int w, h;
+
+      nick = gtk_constraint_guide_get_name (editor->guide);
+      if (nick)
+        gtk_editable_set_text (GTK_EDITABLE (editor->name), nick);
+
+      gtk_constraint_guide_get_min_size (editor->guide, &w, &h);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->min_width), w);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->min_height), h);
+
+      gtk_constraint_guide_get_nat_size (editor->guide, &w, &h);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->nat_width), w);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->nat_height), h);
+
+      gtk_constraint_guide_get_max_size (editor->guide, &w, &h);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->max_width), w);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->max_height), h);
+
+      strength = gtk_constraint_guide_get_strength (editor->guide);
+      nick = get_strength_nick (strength);
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->strength), nick);
+
+      gtk_button_set_label (GTK_BUTTON (editor->button), "Apply");
+    }
+  else
+    {
+      char *name;
+
+      guide_counter++;
+      name = g_strdup_printf ("Guide %d", guide_counter);
+      gtk_editable_set_text (GTK_EDITABLE (editor->name), name);
+      g_free (name);
+
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->min_width), 0.0);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->min_height), 0.0);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->nat_width), 0.0);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->nat_height), 0.0);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->max_width), G_MAXINT);
+      gtk_spin_button_set_value (GTK_SPIN_BUTTON (editor->max_height), G_MAXINT);
+
+      gtk_combo_box_set_active_id (GTK_COMBO_BOX (editor->strength), "medium");
+
+      gtk_button_set_label (GTK_BUTTON (editor->button), "Create");
+    }
+
+  editor->constructed = TRUE;
+}
+
+static void
+guide_editor_set_property (GObject      *object,
+                           guint         property_id,
+                           const GValue *value,
+                           GParamSpec   *pspec)
+{
+  GuideEditor *self = GUIDE_EDITOR (object);
+
+  switch (property_id)
+    {
+    case PROP_GUIDE:
+      self->guide = g_value_dup_object (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+guide_editor_get_property (GObject    *object,
+                           guint       property_id,
+                           GValue     *value,
+                           GParamSpec *pspec)
+{
+  GuideEditor *self = GUIDE_EDITOR (object);
+
+  switch (property_id)
+    {
+    case PROP_GUIDE:
+      g_value_set_object (value, self->guide);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+guide_editor_dispose (GObject *object)
+{
+  GuideEditor *self = (GuideEditor *)object;
+
+  g_clear_pointer (&self->grid, gtk_widget_unparent);
+  g_clear_object (&self->guide);
+
+  G_OBJECT_CLASS (guide_editor_parent_class)->dispose (object);
+}
+
+static void
+guide_editor_class_init (GuideEditorClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+  object_class->constructed = guide_editor_constructed;
+  object_class->dispose = guide_editor_dispose;
+  object_class->set_property = guide_editor_set_property;
+  object_class->get_property = guide_editor_get_property;
+
+  pspecs[PROP_GUIDE] =
+    g_param_spec_object ("guide", "guide", "guide",
+                         GTK_TYPE_CONSTRAINT_GUIDE,
+                         G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY);
+
+  g_object_class_install_properties (object_class, LAST_PROP, pspecs);
+
+  signals[DONE] =
+    g_signal_new ("done",
+                  G_TYPE_FROM_CLASS (object_class),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  NULL,
+                  G_TYPE_NONE, 1, GTK_TYPE_CONSTRAINT_GUIDE);
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
+
+  gtk_widget_class_set_template_from_resource (widget_class,
+                                               "/org/gtk/gtk4/constraint-editor/guide-editor.ui");
+
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, grid);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, name);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, min_width);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, min_height);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, nat_width);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, nat_height);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, max_width);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, max_height);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, strength);
+  gtk_widget_class_bind_template_child (widget_class, GuideEditor, button);
+
+  gtk_widget_class_bind_template_callback (widget_class, create_guide);
+}
+
+GuideEditor *
+guide_editor_new (GtkConstraintGuide *guide)
+{
+  return g_object_new (GUIDE_EDITOR_TYPE,
+                       "guide", guide,
+                       NULL);
+}

demos/constraint-editor/guide-editor.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright © 2019 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#define GUIDE_EDITOR_TYPE (guide_editor_get_type ())
+
+G_DECLARE_FINAL_TYPE (GuideEditor, guide_editor, GUIDE, EDITOR, GtkWidget)
+
+GuideEditor * guide_editor_new (GtkConstraintGuide  *guide);
+
+void guide_editor_serialize_guide (GString            *str,
+                                   int                 indent,
+                                   GtkConstraintGuide *guide);

demos/constraint-editor/guide-editor.ui

@@ -0,0 +1,188 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <object class="GtkAdjustment" id="min_width_adj">
+    <property name="lower">0</property>
+    <property name="upper">2147483647</property>
+    <property name="step-increment">1</property>
+    <property name="page-increment">10</property>
+    <property name="page-size">0</property>
+  </object>
+  <object class="GtkAdjustment" id="min_height_adj">
+    <property name="lower">0</property>
+    <property name="upper">2147483647</property>
+    <property name="step-increment">1</property>
+    <property name="page-increment">10</property>
+    <property name="page-size">0</property>
+  </object>
+  <object class="GtkAdjustment" id="nat_width_adj">
+    <property name="lower">0</property>
+    <property name="upper">2147483647</property>
+    <property name="step-increment">1</property>
+    <property name="page-increment">10</property>
+    <property name="page-size">0</property>
+  </object>
+  <object class="GtkAdjustment" id="nat_height_adj">
+    <property name="lower">0</property>
+    <property name="upper">2147483647</property>
+    <property name="step-increment">1</property>
+    <property name="page-increment">10</property>
+    <property name="page-size">0</property>
+  </object>
+  <object class="GtkAdjustment" id="max_width_adj">
+    <property name="lower">0</property>
+    <property name="upper">2147483647</property>
+    <property name="step-increment">1</property>
+    <property name="page-increment">10</property>
+    <property name="page-size">0</property>
+  </object>
+  <object class="GtkAdjustment" id="max_height_adj">
+    <property name="lower">0</property>
+    <property name="upper">2147483647</property>
+    <property name="step-increment">1</property>
+    <property name="page-increment">10</property>
+    <property name="page-size">0</property>
+  </object>
+  <template class="GuideEditor" parent="GtkWidget">
+    <child>
+      <object class="GtkGrid" id="grid">
+        <property name="margin">20</property>
+        <property name="row-spacing">10</property>
+        <property name="column-spacing">10</property>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Name</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">0</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkEntry" id="name">
+            <property name="max-width-chars">20</property>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">0</property>
+              <property name="column-span">2</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Min Size</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkSpinButton" id="min_width">
+            <property name="adjustment">min_width_adj</property>
+            <property name="max-width-chars">5</property>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkSpinButton" id="min_height">
+            <property name="adjustment">min_height_adj</property>
+            <property name="max-width-chars">5</property>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Nat Size</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">2</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkSpinButton" id="nat_width">
+            <property name="adjustment">nat_width_adj</property>
+            <property name="max-width-chars">5</property>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">2</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkSpinButton" id="nat_height">
+            <property name="adjustment">nat_height_adj</property>
+            <property name="max-width-chars">5</property>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">2</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Max Size</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">3</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkSpinButton" id="max_width">
+            <property name="adjustment">max_width_adj</property>
+            <property name="max-width-chars">5</property>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">3</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkSpinButton" id="max_height">
+            <property name="adjustment">max_height_adj</property>
+            <property name="max-width-chars">5</property>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">3</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Strength</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">4</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkComboBoxText" id="strength">
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">4</property>
+              <property name="column-span">2</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkButton" id="button">
+            <property name="label">Create</property>
+            <signal name="clicked" handler="create_guide"/>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">5</property>
+            </layout>
+          </object>
+        </child>
+      </object>
+    </child>
+  </template>
+</interface>

demos/constraint-editor/main.c

@@ -0,0 +1,28 @@
+/*
+ * Copyright © 2019 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen <mclasen@redhat.com>
+ */
+
+#include "config.h"
+
+#include <constraint-editor-application.h>
+
+int
+main (int argc, char *argv[])
+{
+  return g_application_run (G_APPLICATION (constraint_editor_application_new ()), argc, argv);
+}

demos/constraint-editor/meson.build

@@ -0,0 +1,20 @@
+constraint_editor_sources = [
+  'main.c',
+  'constraint-editor-application.c',
+  'constraint-editor-window.c',
+  'constraint-view.c',
+  'constraint-editor.c',
+  'guide-editor.c',
+]
+
+constraint_editor_resources = gnome.compile_resources('constraint_editor_resources',
+                                                      'constraint-editor.gresource.xml',
+                                                      source_dir: '.')
+
+executable('gtk4-constraint-editor',
+           constraint_editor_sources, constraint_editor_resources,
+           dependencies: libgtk_dep,
+           include_directories: confinc,
+           gui_app: true,
+           link_args: extra_demo_ldflags,
+           install: false)

demos/gtk-demo/application.c

@@ -212,7 +212,7 @@ activate_about (GSimpleAction *action,
                          "comments", "Program to demonstrate GTK functions.",
                          "authors", authors,
                          "documenters", documentors,
-                         "logo-icon-name", "org.gtk.Demo",
+                         "logo-icon-name", "org.gtk.Demo4",
                          "title", "About GTK Code Demos",
                          NULL);
 }
@@ -370,7 +370,7 @@ demo_application_init (DemoApplication *app)
   GSettings *settings;
   GAction *action;
 
-  settings = g_settings_new ("org.gtk.Demo");
+  settings = g_settings_new ("org.gtk.Demo4");
 
   g_action_map_add_action_entries (G_ACTION_MAP (app),
                                    app_entries, G_N_ELEMENTS (app_entries),
@@ -397,7 +397,7 @@ demo_application_window_store_state (DemoApplicationWindow *win)
 {
   GSettings *settings;
 
-  settings = g_settings_new ("org.gtk.Demo");
+  settings = g_settings_new ("org.gtk.Demo4");
   g_settings_set (settings, "window-size", "(ii)", win->width, win->height);
   g_settings_set_boolean (settings, "maximized", win->maximized);
   g_settings_set_boolean (settings, "fullscreen", win->fullscreen);
@@ -409,7 +409,7 @@ demo_application_window_load_state (DemoApplicationWindow *win)
 {
   GSettings *settings;
 
-  settings = g_settings_new ("org.gtk.Demo");
+  settings = g_settings_new ("org.gtk.Demo4");
   g_settings_get (settings, "window-size", "(ii)", &win->width, &win->height);
   win->maximized = g_settings_get_boolean (settings, "maximized");
   win->fullscreen = g_settings_get_boolean (settings, "fullscreen");
@@ -477,7 +477,7 @@ surface_state_changed (GtkWidget *widget)
   DemoApplicationWindow *window = (DemoApplicationWindow *)widget;
   GdkSurfaceState new_state;
 
-  new_state = gdk_surface_get_state (gtk_widget_get_surface (widget));
+  new_state = gdk_surface_get_state (gtk_native_get_surface (GTK_NATIVE (widget)));
   window->maximized = (new_state & GDK_SURFACE_STATE_MAXIMIZED) != 0;
   window->fullscreen = (new_state & GDK_SURFACE_STATE_FULLSCREEN) != 0;
 }
@@ -487,14 +487,14 @@ demo_application_window_realize (GtkWidget *widget)
 {
   GTK_WIDGET_CLASS (demo_application_window_parent_class)->realize (widget);
 
-  g_signal_connect_swapped (gtk_widget_get_surface (widget), "notify::state",
+  g_signal_connect_swapped (gtk_native_get_surface (GTK_NATIVE (widget)), "notify::state",
                             G_CALLBACK (surface_state_changed), widget);
 }
 
 static void
 demo_application_window_unrealize (GtkWidget *widget)
 {
-  g_signal_handlers_disconnect_by_func (gtk_widget_get_surface (widget),
+  g_signal_handlers_disconnect_by_func (gtk_native_get_surface (GTK_NATIVE (widget)),
                                         surface_state_changed, widget);
 
   GTK_WIDGET_CLASS (demo_application_window_parent_class)->unrealize (widget);
@@ -541,7 +541,7 @@ main (int argc, char *argv[])
   GtkApplication *app;
 
   app = GTK_APPLICATION (g_object_new (demo_application_get_type (),
-                                       "application-id", "org.gtk.Demo2",
+                                       "application-id", "org.gtk.Demo4.App",
                                        "flags", G_APPLICATION_HANDLES_OPEN,
                                        NULL));
 

demos/gtk-demo/application.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <template class="DemoApplicationWindow" parent="GtkApplicationWindow">
     <property name="title" translatable="yes">Application Class</property>
@@ -32,11 +33,11 @@
                 <property name="action-name">win.logo</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkInfoBar" id="infobar">
@@ -63,11 +64,11 @@
                 </child>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
         <child>
           <object class="GtkScrolledWindow">
@@ -79,20 +80,20 @@
                 <property name="buffer">buffer</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
         <child>
           <object class="GtkStatusbar" id="status">
             <property name="hexpand">1</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">3</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">3</property>
-          </packing>
         </child>
       </object>
     </child>

demos/gtk-demo/application_demo.c

@@ -52,7 +52,7 @@ do_application_demo (GtkWidget *toplevel)
 
   if (watch == 0)
     watch = g_bus_watch_name (G_BUS_TYPE_SESSION,
-                              "org.gtk.Demo2",
+                              "org.gtk.Demo4.App",
                               0,
                               on_name_appeared,
                               on_name_vanished,
@@ -80,8 +80,8 @@ do_application_demo (GtkWidget *toplevel)
   else
     {
       g_dbus_connection_call_sync (g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL),
-                                   "org.gtk.Demo2",
-                                   "/org/gtk/Demo2",
+                                   "org.gtk.Demo4.App",
+                                   "/org/gtk/Demo4/App",
                                    "org.gtk.Actions",
                                    "Activate",
                                    g_variant_new ("(sava{sv})", "quit", NULL, NULL),

demos/gtk-demo/appmenu.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <menu id="appmenu">
     <section>

demos/gtk-demo/blendmodes.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <requires lib="gtk+" version="3.20"/>
   <object class="GtkWindow" id="window">
@@ -16,11 +17,11 @@
             <style>
               <class name="dim-label"/>
             </style>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkScrolledWindow" id="scrolledwindow">
@@ -28,22 +29,22 @@
             <property name="vexpand">1</property>
             <property name="shadow-type">in</property>
             <property name="min-content-width">150</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
         <child>
           <object class="GtkStackSwitcher">
             <property name="halign">center</property>
             <property name="hexpand">1</property>
             <property name="stack">stack</property>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkStack" id="stack">
@@ -66,53 +67,53 @@
                     <child>
                       <object class="GtkLabel">
                         <property name="label" translatable="yes">Duck</property>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">0</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">0</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkLabel">
                         <property name="label" translatable="yes">Background</property>
+                        <layout>
+                          <property name="left-attach">1</property>
+                          <property name="top-attach">0</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">1</property>
-                        <property name="top-attach">0</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
                         <style>
                           <class name="duck"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">1</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">1</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
                         <style>
                           <class name="gradient"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">1</property>
+                          <property name="top-attach">1</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">1</property>
-                        <property name="top-attach">1</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkLabel">
                         <property name="label" translatable="yes">
 Blended picture</property>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">2</property>
+                          <property name="column-span">2</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">2</property>
-                        <property name="width">2</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
@@ -120,12 +121,12 @@ Blended picture</property>
                         <style>
                           <class name="blend0"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">3</property>
+                          <property name="column-span">2</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">3</property>
-                        <property name="width">2</property>
-                      </packing>
                     </child>
                   </object>
                 </property>
@@ -145,53 +146,53 @@ Blended picture</property>
                     <child>
                       <object class="GtkLabel">
                         <property name="label" translatable="yes">Red</property>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">0</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">0</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkLabel">
                         <property name="label" translatable="yes">Blue</property>
+                        <layout>
+                          <property name="left-attach">1</property>
+                          <property name="top-attach">0</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">1</property>
-                        <property name="top-attach">0</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
                         <style>
                           <class name="red"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">1</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">1</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
                         <style>
                           <class name="blue"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">1</property>
+                          <property name="top-attach">1</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">1</property>
-                        <property name="top-attach">1</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkLabel">
                         <property name="label" translatable="yes">
 Blended picture</property>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">2</property>
+                          <property name="column-span">2</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">2</property>
-                        <property name="width">2</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
@@ -199,12 +200,12 @@ Blended picture</property>
                         <style>
                           <class name="blend1"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">3</property>
+                          <property name="column-span">2</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">3</property>
-                        <property name="width">2</property>
-                      </packing>
                     </child>
                   </object>
                 </property>
@@ -227,33 +228,33 @@ Blended picture</property>
                         <style>
                           <class name="cyan"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">1</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">1</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
                         <style>
                           <class name="magenta"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">1</property>
+                          <property name="top-attach">1</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">1</property>
-                        <property name="top-attach">1</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
                         <style>
                           <class name="yellow"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">3</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">3</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkImage">
@@ -261,11 +262,11 @@ Blended picture</property>
                         <style>
                           <class name="blend2"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">1</property>
+                          <property name="top-attach">3</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">1</property>
-                        <property name="top-attach">3</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkLabel">
@@ -274,11 +275,11 @@ Blended picture</property>
                         <style>
                           <class name="dim-label"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">0</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">0</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkLabel">
@@ -287,11 +288,11 @@ Blended picture</property>
                         <style>
                           <class name="dim-label"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">1</property>
+                          <property name="top-attach">0</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">1</property>
-                        <property name="top-attach">0</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkLabel">
@@ -300,11 +301,11 @@ Blended picture</property>
                         <style>
                           <class name="dim-label"/>
                         </style>
+                        <layout>
+                          <property name="left-attach">0</property>
+                          <property name="top-attach">2</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">0</property>
-                        <property name="top-attach">2</property>
-                      </packing>
                     </child>
                     <child>
                       <object class="GtkLabel">
@@ -313,21 +314,21 @@ Blended picture</property>
                         <attributes>
                           <attribute name="weight" value="bold"></attribute>
                         </attributes>
+                        <layout>
+                          <property name="left-attach">1</property>
+                          <property name="top-attach">2</property>
+                        </layout>
                       </object>
-                      <packing>
-                        <property name="left-attach">1</property>
-                        <property name="top-attach">2</property>
-                      </packing>
                     </child>
                   </object>
                 </property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
       </object>
     </child>

demos/gtk-demo/bluroverlay.c

@@ -458,7 +458,6 @@ blur_overlay_class_init (BlurOverlayClass *klass)
 static void
 blur_overlay_init (BlurOverlay *overlay)
 {
-  gtk_widget_set_has_surface (GTK_WIDGET (overlay), FALSE);
 }
 
 GtkWidget *

demos/gtk-demo/changedisplay.c

@@ -74,17 +74,17 @@ find_toplevel_at_pointer (GdkDisplay *display)
   pointer_window = gdk_device_get_surface_at_position (gtk_get_current_event_device (), NULL, NULL);
 
   if (pointer_window)
-    widget = GTK_WIDGET (gtk_root_get_for_surface (pointer_window));
+    widget = GTK_WIDGET (gtk_native_get_for_surface (pointer_window));
 
   return widget;
 }
 
 static void
-released_cb (GtkGestureMultiPress *gesture,
-             guint                 n_press,
-             gdouble               x,
-             gdouble               y,
-             gboolean             *clicked)
+released_cb (GtkGestureClick *gesture,
+             guint            n_press,
+             gdouble          x,
+             gdouble          y,
+             gboolean        *clicked)
 {
   *clicked = TRUE;
 }
@@ -105,7 +105,6 @@ query_for_toplevel (GdkDisplay *display,
   popup = gtk_window_new (GTK_WINDOW_POPUP);
   gtk_window_set_display (GTK_WINDOW (popup), display);
   gtk_window_set_modal (GTK_WINDOW (popup), TRUE);
-  gtk_window_set_position (GTK_WINDOW (popup), GTK_WIN_POS_CENTER);
 
   frame = gtk_frame_new (NULL);
   gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
@@ -120,11 +119,11 @@ query_for_toplevel (GdkDisplay *display,
   device = gtk_get_current_event_device ();
 
   if (gdk_seat_grab (gdk_device_get_seat (device),
-                     gtk_widget_get_surface (popup),
+                     gtk_native_get_surface (GTK_NATIVE (popup)),
                      GDK_SEAT_CAPABILITY_ALL_POINTING,
                      FALSE, cursor, NULL, NULL, NULL) == GDK_GRAB_SUCCESS)
     {
-      GtkGesture *gesture = gtk_gesture_multi_press_new ();
+      GtkGesture *gesture = gtk_gesture_click_new ();
       gboolean clicked = FALSE;
 
       g_signal_connect (gesture, "released",

demos/gtk-demo/clipboard.c

@@ -319,7 +319,7 @@ do_clipboard (GtkWidget *do_widget)
                         G_CALLBACK (drag_data_received), image);
 
       /* context menu on image */
-      gesture = gtk_gesture_multi_press_new ();
+      gesture = gtk_gesture_click_new ();
       gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), GDK_BUTTON_SECONDARY);
       g_signal_connect (gesture, "pressed", G_CALLBACK (pressed_cb), image);
       gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (gesture));
@@ -344,7 +344,7 @@ do_clipboard (GtkWidget *do_widget)
                         G_CALLBACK (drag_data_received), image);
 
       /* context menu on image */
-      gesture = gtk_gesture_multi_press_new ();
+      gesture = gtk_gesture_click_new ();
       gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), GDK_BUTTON_SECONDARY);
       g_signal_connect (gesture, "pressed", G_CALLBACK (pressed_cb), image);
       gtk_widget_add_controller (image, GTK_EVENT_CONTROLLER (gesture));

demos/gtk-demo/constraints.c

@@ -0,0 +1,289 @@
+/* Constraints/Simple
+ *
+ * GtkConstraintLayout provides a layout manager that uses relations
+ * between widgets (also known as "constraints") to compute the position
+ * and size of each child.
+ */
+
+#include <glib/gi18n.h>
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE (SimpleGrid, simple_grid, SIMPLE, GRID, GtkWidget)
+
+struct _SimpleGrid
+{
+  GtkWidget parent_instance;
+
+  GtkWidget *button1, *button2;
+  GtkWidget *button3;
+};
+
+G_DEFINE_TYPE (SimpleGrid, simple_grid, GTK_TYPE_WIDGET)
+
+static void
+simple_grid_destroy (GtkWidget *widget)
+{
+  SimpleGrid *self = SIMPLE_GRID (widget);
+
+  g_clear_pointer (&self->button1, gtk_widget_destroy);
+  g_clear_pointer (&self->button2, gtk_widget_destroy);
+  g_clear_pointer (&self->button3, gtk_widget_destroy);
+
+  GTK_WIDGET_CLASS (simple_grid_parent_class)->destroy (widget);
+}
+
+static void
+simple_grid_class_init (SimpleGridClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  widget_class->destroy = simple_grid_destroy;
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_CONSTRAINT_LAYOUT);
+}
+
+/* Layout:
+ *
+ *   +-------------------------------------+
+ *   | +-----------++-------++-----------+ |
+ *   | |  Child 1  || Space ||  Child 2  | |
+ *   | +-----------++-------++-----------+ |
+ *   | +---------------------------------+ |
+ *   | |             Child 3             | |
+ *   | +---------------------------------+ |
+ *   +-------------------------------------+
+ *
+ * Constraints:
+ *
+ *   super.start = child1.start - 8
+ *   child1.width = child2.width
+ *   child1.end = space.start
+ *   space.end = child2.start
+ *   child2.end = super.end - 8
+ *   super.start = child3.start - 8
+ *   child3.end = super.end - 8
+ *   super.top = child1.top - 8
+ *   super.top = child2.top - 8
+ *   child1.bottom = child3.top - 12
+ *   child2.bottom = child3.top - 12
+ *   child3.height = child1.height
+ *   child3.height = child2.height
+ *   child3.bottom = super.bottom - 8
+ *
+ * To add some flexibility, we make the space
+ * stretchable:
+ *
+ *   space.width >= 10
+ *   space.width = 100
+ *   space.width <= 200
+ */
+static void
+build_constraints (SimpleGrid          *self,
+                   GtkConstraintLayout *manager)
+{
+  GtkConstraintGuide *guide;
+
+  guide = gtk_constraint_guide_new ();
+  gtk_constraint_guide_set_name (guide, "space");
+  gtk_constraint_guide_set_min_size (guide, 10, 10);
+  gtk_constraint_guide_set_nat_size (guide, 100, 10);
+  gtk_constraint_guide_set_max_size (guide, 200, 20);
+  gtk_constraint_guide_set_strength (guide, GTK_CONSTRAINT_STRENGTH_STRONG);
+  gtk_constraint_layout_add_guide (manager, guide);
+
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new_constant (GTK_CONSTRAINT_TARGET (self->button1),
+                        GTK_CONSTRAINT_ATTRIBUTE_WIDTH,
+                        GTK_CONSTRAINT_RELATION_LE,
+                        200.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button1,
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button1,
+                        GTK_CONSTRAINT_ATTRIBUTE_WIDTH,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button2,
+                        GTK_CONSTRAINT_ATTRIBUTE_WIDTH,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button1,
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        guide,
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (guide,
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button2,
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button2,
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button3,
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button3,
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button1,
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button2,
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button1,
+                        GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button3,
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        1.0,
+                        -12.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button2,
+                        GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button3,
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        1.0,
+                        -12.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button3,
+                        GTK_CONSTRAINT_ATTRIBUTE_HEIGHT,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button1,
+                        GTK_CONSTRAINT_ATTRIBUTE_HEIGHT,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button3,
+                        GTK_CONSTRAINT_ATTRIBUTE_HEIGHT,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        self->button2,
+                        GTK_CONSTRAINT_ATTRIBUTE_HEIGHT,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (self->button3,
+                        GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+}
+
+static void
+simple_grid_init (SimpleGrid *self)
+{
+  GtkWidget *widget = GTK_WIDGET (self);
+
+  self->button1 = gtk_button_new_with_label ("Child 1");
+  gtk_widget_set_parent (self->button1, widget);
+  gtk_widget_set_name (self->button1, "button1");
+
+  self->button2 = gtk_button_new_with_label ("Child 2");
+  gtk_widget_set_parent (self->button2, widget);
+  gtk_widget_set_name (self->button2, "button2");
+
+  self->button3 = gtk_button_new_with_label ("Child 3");
+  gtk_widget_set_parent (self->button3, widget);
+  gtk_widget_set_name (self->button3, "button3");
+
+  GtkLayoutManager *manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
+  build_constraints (self, GTK_CONSTRAINT_LAYOUT (manager));
+}
+
+GtkWidget *
+do_constraints (GtkWidget *do_widget)
+{
+ static GtkWidget *window;
+
+ if (!window)
+   {
+     GtkWidget *header, *box, *grid, *button;
+
+     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+     gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
+
+     header = gtk_header_bar_new ();
+     gtk_header_bar_set_title (GTK_HEADER_BAR (header), "Constraints");
+     gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (header), FALSE);
+     gtk_window_set_titlebar (GTK_WINDOW (window), header);
+     g_signal_connect (window, "destroy",
+                       G_CALLBACK (gtk_widget_destroyed), &window);
+
+     box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+     gtk_container_add (GTK_CONTAINER (window), box);
+
+     grid = g_object_new (simple_grid_get_type (), NULL);
+     gtk_widget_set_hexpand (grid, TRUE);
+     gtk_widget_set_vexpand (grid, TRUE);
+     gtk_container_add (GTK_CONTAINER (box), grid);
+
+     button = gtk_button_new_with_label ("Close");
+     gtk_container_add (GTK_CONTAINER (box), button);
+     gtk_widget_set_hexpand (grid, TRUE);
+     g_signal_connect_swapped (button, "clicked",
+                               G_CALLBACK (gtk_widget_destroy), window);
+   }
+
+ if (!gtk_widget_get_visible (window))
+   gtk_widget_show (window);
+ else
+   gtk_widget_destroy (window);
+
+ return window;
+}

demos/gtk-demo/constraints2.c

@@ -0,0 +1,245 @@
+/* Constraints/Interactive
+ *
+ * Demonstrate how constraints can be updates during
+ * user interaction.
+ */
+
+#include <glib/gi18n.h>
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE (InteractiveGrid, interactive_grid, INTERACTIVE, GRID, GtkWidget)
+
+struct _InteractiveGrid
+{
+  GtkWidget parent_instance;
+
+  GtkWidget *button1, *button2;
+  GtkWidget *button3;
+  GtkConstraintGuide *guide;
+  GtkConstraint *constraint;
+};
+
+G_DEFINE_TYPE (InteractiveGrid, interactive_grid, GTK_TYPE_WIDGET)
+
+static void
+interactive_grid_destroy (GtkWidget *widget)
+{
+  InteractiveGrid *self = INTERACTIVE_GRID (widget);
+
+  g_clear_pointer (&self->button1, gtk_widget_destroy);
+  g_clear_pointer (&self->button2, gtk_widget_destroy);
+  g_clear_pointer (&self->button3, gtk_widget_destroy);
+
+  GTK_WIDGET_CLASS (interactive_grid_parent_class)->destroy (widget);
+}
+
+static void
+interactive_grid_class_init (InteractiveGridClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  widget_class->destroy = interactive_grid_destroy;
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_CONSTRAINT_LAYOUT);
+}
+
+static void
+build_constraints (InteractiveGrid          *self,
+                   GtkConstraintLayout *manager)
+{
+  self->guide = g_object_new (GTK_TYPE_CONSTRAINT_GUIDE, NULL);
+  gtk_constraint_layout_add_guide (manager, self->guide);
+
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new_constant (GTK_CONSTRAINT_TARGET (self->guide),
+                        GTK_CONSTRAINT_ATTRIBUTE_WIDTH,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        GTK_CONSTRAINT_TARGET (self->button1),
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (GTK_CONSTRAINT_TARGET (self->button1),
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        GTK_CONSTRAINT_TARGET (self->guide),
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (GTK_CONSTRAINT_TARGET (self->button2),
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        GTK_CONSTRAINT_TARGET (self->guide),
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (GTK_CONSTRAINT_TARGET (self->button2),
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        GTK_CONSTRAINT_TARGET (self->button3),
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (GTK_CONSTRAINT_TARGET (self->button3),
+                        GTK_CONSTRAINT_ATTRIBUTE_END,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        GTK_CONSTRAINT_TARGET (self->guide),
+                        GTK_CONSTRAINT_ATTRIBUTE_START,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        GTK_CONSTRAINT_TARGET (self->button1),
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (GTK_CONSTRAINT_TARGET (self->button2),
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        GTK_CONSTRAINT_TARGET (self->button1),
+                        GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (GTK_CONSTRAINT_TARGET (self->button3),
+                        GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        GTK_CONSTRAINT_TARGET (self->button2),
+                        GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                        1.0,
+                        0.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+  gtk_constraint_layout_add_constraint (manager,
+    gtk_constraint_new (GTK_CONSTRAINT_TARGET (self->button3),
+                        GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                        GTK_CONSTRAINT_RELATION_EQ,
+                        NULL,
+                        GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                        1.0,
+                        -8.0,
+                        GTK_CONSTRAINT_STRENGTH_REQUIRED));
+}
+
+static void
+drag_cb (GtkGestureDrag  *drag,
+         double           offset_x,
+         double           offset_y,
+         InteractiveGrid *self)
+{
+  GtkConstraintLayout *layout = GTK_CONSTRAINT_LAYOUT (gtk_widget_get_layout_manager (GTK_WIDGET (self)));
+  double x, y;
+
+  if (self->constraint)
+    {
+      gtk_constraint_layout_remove_constraint (layout, self->constraint);
+      g_clear_object (&self->constraint);
+    }
+
+  gtk_gesture_drag_get_start_point (drag, &x, &y);
+  self->constraint = gtk_constraint_new_constant (GTK_CONSTRAINT_TARGET (self->guide),
+                                                  GTK_CONSTRAINT_ATTRIBUTE_LEFT,
+                                                  GTK_CONSTRAINT_RELATION_EQ,
+                                                  x + offset_x,
+                                                  GTK_CONSTRAINT_STRENGTH_REQUIRED);
+  gtk_constraint_layout_add_constraint (layout, g_object_ref (self->constraint));
+  gtk_widget_queue_allocate (GTK_WIDGET (self));
+}
+
+static void
+interactive_grid_init (InteractiveGrid *self)
+{
+  GtkWidget *widget = GTK_WIDGET (self);
+  GtkGesture *drag;
+
+  self->button1 = gtk_button_new_with_label ("Child 1");
+  gtk_widget_set_parent (self->button1, widget);
+  gtk_widget_set_name (self->button1, "button1");
+
+  self->button2 = gtk_button_new_with_label ("Child 2");
+  gtk_widget_set_parent (self->button2, widget);
+  gtk_widget_set_name (self->button2, "button2");
+
+  self->button3 = gtk_button_new_with_label ("Child 3");
+  gtk_widget_set_parent (self->button3, widget);
+  gtk_widget_set_name (self->button3, "button3");
+
+  GtkLayoutManager *manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
+  build_constraints (self, GTK_CONSTRAINT_LAYOUT (manager));
+
+  drag = gtk_gesture_drag_new ();
+  g_signal_connect (drag, "drag-update", G_CALLBACK (drag_cb), self);
+  gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (drag));
+}
+
+GtkWidget *
+do_constraints2 (GtkWidget *do_widget)
+{
+ static GtkWidget *window;
+
+ if (!window)
+   {
+     GtkWidget *header, *box, *grid, *button;
+
+     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+     gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
+
+     header = gtk_header_bar_new ();
+     gtk_header_bar_set_title (GTK_HEADER_BAR (header), "Constraints");
+     gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (header), FALSE);
+     gtk_window_set_titlebar (GTK_WINDOW (window), header);
+     g_signal_connect (window, "destroy",
+                       G_CALLBACK (gtk_widget_destroyed), &window);
+
+     box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+     gtk_container_add (GTK_CONTAINER (window), box);
+
+     grid = g_object_new (interactive_grid_get_type (), NULL);
+     gtk_widget_set_hexpand (grid, TRUE);
+     gtk_widget_set_vexpand (grid, TRUE);
+     gtk_container_add (GTK_CONTAINER (box), grid);
+
+     button = gtk_button_new_with_label ("Close");
+     gtk_container_add (GTK_CONTAINER (box), button);
+     gtk_widget_set_hexpand (grid, TRUE);
+     g_signal_connect_swapped (button, "clicked",
+                               G_CALLBACK (gtk_widget_destroy), window);
+   }
+
+ if (!gtk_widget_get_visible (window))
+   gtk_widget_show (window);
+ else
+   gtk_widget_destroy (window);
+
+ return window;
+}

demos/gtk-demo/constraints3.c

@@ -0,0 +1,165 @@
+/* Constraints/VFL
+ *
+ * GtkConstraintLayout allows defining constraints using a
+ * compact syntax called Visual Format Language, or VFL.
+ */
+
+#include <glib/gi18n.h>
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE (VflGrid, vfl_grid, VFL, GRID, GtkWidget)
+
+struct _VflGrid
+{
+  GtkWidget parent_instance;
+
+  GtkWidget *button1, *button2;
+  GtkWidget *button3;
+};
+
+G_DEFINE_TYPE (VflGrid, vfl_grid, GTK_TYPE_WIDGET)
+
+static void
+vfl_grid_destroy (GtkWidget *widget)
+{
+  VflGrid *self = VFL_GRID (widget);
+
+  g_clear_pointer (&self->button1, gtk_widget_destroy);
+  g_clear_pointer (&self->button2, gtk_widget_destroy);
+  g_clear_pointer (&self->button3, gtk_widget_destroy);
+
+  GTK_WIDGET_CLASS (vfl_grid_parent_class)->destroy (widget);
+}
+
+static void
+vfl_grid_class_init (VflGridClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  widget_class->destroy = vfl_grid_destroy;
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_CONSTRAINT_LAYOUT);
+}
+
+/* Layout:
+ *
+ *   +-----------------------------+
+ *   | +-----------+ +-----------+ |
+ *   | |  Child 1  | |  Child 2  | |
+ *   | +-----------+ +-----------+ |
+ *   | +-------------------------+ |
+ *   | |         Child 3         | |
+ *   | +-------------------------+ |
+ *   +-----------------------------+
+ *
+ * Constraints:
+ *
+ *   super.start = child1.start - 8
+ *   child1.width = child2.width
+ *   child1.end = child2.start - 12
+ *   child2.end = super.end - 8
+ *   super.start = child3.start - 8
+ *   child3.end = super.end - 8
+ *   super.top = child1.top - 8
+ *   super.top = child2.top - 8
+ *   child1.bottom = child3.top - 12
+ *   child2.bottom = child3.top - 12
+ *   child3.height = child1.height
+ *   child3.height = child2.height
+ *   child3.bottom = super.bottom - 8
+ *
+ * Visual format:
+ *
+ *   H:|-8-[view1(==view2)-12-[view2]-8-|
+ *   H:|-8-[view3]-8-|
+ *   V:|-8-[view1]-12-[view3(==view1)]-8-|
+ *   V:|-8-[view2]-12-[view3(==view2)]-8-|
+ */
+static void
+build_constraints (VflGrid          *self,
+                   GtkConstraintLayout *manager)
+{
+  const char * const vfl[] = {
+    "H:|-[button1(==button2)]-12-[button2]-|",
+    "H:|-[button3]-|",
+    "V:|-[button1]-12-[button3(==button1)]-|",
+    "V:|-[button2]-12-[button3(==button2)]-|",
+  };
+  GError *error = NULL;
+
+  gtk_constraint_layout_add_constraints_from_description (manager, vfl, G_N_ELEMENTS (vfl),
+                                                          8, 8,
+                                                          &error,
+                                                          "button1", self->button1,
+                                                          "button2", self->button2,
+                                                          "button3", self->button3,
+                                                          NULL);
+  if (error != NULL)
+    {
+      g_printerr ("VFL parsing error:\n%s", error->message);
+      g_error_free (error);
+    }
+}
+
+static void
+vfl_grid_init (VflGrid *self)
+{
+  GtkWidget *widget = GTK_WIDGET (self);
+
+  self->button1 = gtk_button_new_with_label ("Child 1");
+  gtk_widget_set_parent (self->button1, widget);
+  gtk_widget_set_name (self->button1, "button1");
+
+  self->button2 = gtk_button_new_with_label ("Child 2");
+  gtk_widget_set_parent (self->button2, widget);
+  gtk_widget_set_name (self->button2, "button2");
+
+  self->button3 = gtk_button_new_with_label ("Child 3");
+  gtk_widget_set_parent (self->button3, widget);
+  gtk_widget_set_name (self->button3, "button3");
+
+  GtkLayoutManager *manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
+  build_constraints (self, GTK_CONSTRAINT_LAYOUT (manager));
+}
+
+GtkWidget *
+do_constraints3 (GtkWidget *do_widget)
+{
+ static GtkWidget *window;
+
+ if (!window)
+   {
+     GtkWidget *header, *box, *grid, *button;
+
+     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+     gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
+
+     header = gtk_header_bar_new ();
+     gtk_header_bar_set_title (GTK_HEADER_BAR (header), "Constraints");
+     gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (header), FALSE);
+     gtk_window_set_titlebar (GTK_WINDOW (window), header);
+     g_signal_connect (window, "destroy",
+                       G_CALLBACK (gtk_widget_destroyed), &window);
+
+     box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+     gtk_container_add (GTK_CONTAINER (window), box);
+
+     grid = g_object_new (vfl_grid_get_type (), NULL);
+     gtk_widget_set_hexpand (grid, TRUE);
+     gtk_widget_set_vexpand (grid, TRUE);
+     gtk_container_add (GTK_CONTAINER (box), grid);
+
+     button = gtk_button_new_with_label ("Close");
+     gtk_container_add (GTK_CONTAINER (box), button);
+     gtk_widget_set_hexpand (grid, TRUE);
+     g_signal_connect_swapped (button, "clicked",
+                               G_CALLBACK (gtk_widget_destroy), window);
+   }
+
+ if (!gtk_widget_get_visible (window))
+   gtk_widget_show (window);
+ else
+   gtk_widget_destroy (window);
+
+ return window;
+}

demos/gtk-demo/css_basics.c

@@ -13,19 +13,22 @@ show_parsing_error (GtkCssProvider *provider,
                     const GError   *error,
                     GtkTextBuffer  *buffer)
 {
+  const GtkCssLocation *start_location, *end_location;
   GtkTextIter start, end;
   const char *tag_name;
 
+  start_location = gtk_css_section_get_start_location (section);
   gtk_text_buffer_get_iter_at_line_index (buffer,
                                           &start,
-                                          gtk_css_section_get_start_line (section),
-                                          gtk_css_section_get_start_position (section));
+                                          start_location->lines,
+                                          start_location->line_bytes);
+  end_location = gtk_css_section_get_end_location (section);
   gtk_text_buffer_get_iter_at_line_index (buffer,
                                           &end,
-                                          gtk_css_section_get_end_line (section),
-                                          gtk_css_section_get_end_position (section));
+                                          end_location->lines,
+                                          end_location->line_bytes);
 
-  if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
+  if (error->domain == GTK_CSS_PARSER_WARNING)
     tag_name = "warning";
   else
     tag_name = "error";

demos/gtk-demo/css_multiplebgs.c

@@ -13,19 +13,23 @@ show_parsing_error (GtkCssProvider *provider,
                     const GError   *error,
                     GtkTextBuffer  *buffer)
 {
+  const GtkCssLocation *start_location, *end_location;
   GtkTextIter start, end;
   const char *tag_name;
 
+  start_location = gtk_css_section_get_start_location (section);
   gtk_text_buffer_get_iter_at_line_index (buffer,
                                           &start,
-                                          gtk_css_section_get_start_line (section),
-                                          gtk_css_section_get_start_position (section));
+                                          start_location->lines,
+                                          start_location->line_bytes);
+  end_location = gtk_css_section_get_end_location (section);
   gtk_text_buffer_get_iter_at_line_index (buffer,
                                           &end,
-                                          gtk_css_section_get_end_line (section),
-                                          gtk_css_section_get_end_position (section));
+                                          end_location->lines,
+                                          end_location->line_bytes);
 
-  if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
+
+  if (error->domain == GTK_CSS_PARSER_WARNING)
     tag_name = "warning";
   else
     tag_name = "error";

demos/gtk-demo/css_pixbufs.c

@@ -12,19 +12,23 @@ show_parsing_error (GtkCssProvider *provider,
                     const GError   *error,
                     GtkTextBuffer  *buffer)
 {
+  const GtkCssLocation *start_location, *end_location;
   GtkTextIter start, end;
   const char *tag_name;
 
+  start_location = gtk_css_section_get_start_location (section);
   gtk_text_buffer_get_iter_at_line_index (buffer,
                                           &start,
-                                          gtk_css_section_get_start_line (section),
-                                          gtk_css_section_get_start_position (section));
+                                          start_location->lines,
+                                          start_location->line_bytes);
+  end_location = gtk_css_section_get_end_location (section);
   gtk_text_buffer_get_iter_at_line_index (buffer,
                                           &end,
-                                          gtk_css_section_get_end_line (section),
-                                          gtk_css_section_get_end_position (section));
+                                          end_location->lines,
+                                          end_location->line_bytes);
 
-  if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
+
+  if (error->domain == GTK_CSS_PARSER_WARNING)
     tag_name = "warning";
   else
     tag_name = "error";

demos/gtk-demo/css_shadows.c

@@ -11,19 +11,22 @@ show_parsing_error (GtkCssProvider *provider,
                     const GError   *error,
                     GtkTextBuffer  *buffer)
 {
+  const GtkCssLocation *start_location, *end_location;
   GtkTextIter start, end;
   const char *tag_name;
 
+  start_location = gtk_css_section_get_start_location (section);
   gtk_text_buffer_get_iter_at_line_index (buffer,
                                           &start,
-                                          gtk_css_section_get_start_line (section),
-                                          gtk_css_section_get_start_position (section));
+                                          start_location->lines,
+                                          start_location->line_bytes);
+  end_location = gtk_css_section_get_end_location (section);
   gtk_text_buffer_get_iter_at_line_index (buffer,
                                           &end,
-                                          gtk_css_section_get_end_line (section),
-                                          gtk_css_section_get_end_position (section));
+                                          end_location->lines,
+                                          end_location->line_bytes);
 
-  if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
+  if (error->domain == GTK_CSS_PARSER_WARNING)
     tag_name = "warning";
   else
     tag_name = "error";

demos/gtk-demo/cursors.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GdkCursor" id="default_cursor">
     <property name="name">default</property>

demos/gtk-demo/data/symbolic/apps/org.gtk.Demo4-symbolic.svg

@@ -10,7 +10,7 @@
    xmlns="http://www.w3.org/2000/svg"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   sodipodi:docname="org.gtk.Demo-symbolic.svg"
+   sodipodi:docname="org.gtk.Demo4-symbolic.svg"
    height="16.03125"
    id="svg7384"
    inkscape:version="0.92.4 5da689c313, 2019-01-14"

demos/gtk-demo/demo.gresource.xml

@@ -37,6 +37,9 @@
   <gresource prefix="/theming_style_classes">
     <file>theming.ui</file>
   </gresource>
+  <gresource prefix="/themes">
+    <file>themes.ui</file>
+  </gresource>
   <gresource prefix="/css_pixbufs">
     <file alias="gtk.css">css_pixbufs.css</file>
     <file>cssview.css</file>
@@ -147,6 +150,9 @@
     <file>clipboard.c</file>
     <file>colorsel.c</file>
     <file>combobox.c</file>
+    <file>constraints.c</file>
+    <file>constraints2.c</file>
+    <file>constraints3.c</file>
     <file>css_accordion.c</file>
     <file>css_basics.c</file>
     <file>css_blendmodes.c</file>
@@ -163,10 +169,12 @@
     <file>expander.c</file>
     <file>filtermodel.c</file>
     <file>fishbowl.c</file>
+    <file>fixed.c</file>
     <file>flowbox.c</file>
     <file>foreigndrawing.c</file>
     <file>font_features.c</file>
     <file>fontplane.c</file>
+    <file>fontrendering.c</file>
     <file>gestures.c</file>
     <file>glarea.c</file>
     <file>headerbar.c</file>
@@ -207,9 +215,11 @@
     <file>spinbutton.c</file>
     <file>spinner.c</file>
     <file>tabs.c</file>
+    <file>tagged_entry.c</file>
     <file>textview.c</file>
     <file>textscroll.c</file>
     <file>theming_style_classes.c</file>
+    <file>themes.c</file>
     <file>transparent.c</file>
     <file>tree_store.c</file>
     <file>textmask.c</file>
@@ -218,6 +228,9 @@
   <gresource prefix="/textview">
     <file>floppybuddy.gif</file>
   </gresource>
+  <gresource prefix="/tagged_entry">
+    <file>tagstyle.css</file>
+  </gresource>
   <gresource prefix="/listbox">
     <file>listbox.ui</file>
     <file>messages.txt</file>
@@ -262,7 +275,17 @@
   <gresource prefix="/dnd">
     <file>dnd.css</file>
   </gresource>
-  <gresource prefix="/org/gtk/Demo">
+  <gresource prefix="/tagged_entry">
+    <file>demotaggedentry.c</file>
+    <file>demotaggedentry.h</file>
+  </gresource>
+  <gresource prefix="/fixed">
+    <file>fixed.css</file>
+  </gresource>
+  <gresource prefix="/fontrendering">
+    <file>fontrendering.ui</file>
+  </gresource>
+  <gresource prefix="/org/gtk/Demo4">
     <file>icons/16x16/actions/application-exit.png</file>
     <file>icons/16x16/actions/document-new.png</file>
     <file>icons/16x16/actions/document-open.png</file>

demos/gtk-demo/demo.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkListStore" id="liststore1">
     <columns>

demos/gtk-demo/demotaggedentry.c

@@ -0,0 +1,489 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 2019 Red Hat, Inc.
+ *
+ * Authors:
+ * - Matthias Clasen <mclasen@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "demotaggedentry.h"
+
+#include <gtk/gtk.h>
+#include <gtk/gtk-a11y.h>
+
+typedef struct {
+  GtkWidget *box;
+  GtkWidget *entry;
+} DemoTaggedEntryPrivate;
+
+static void demo_tagged_entry_editable_init (GtkEditableInterface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (DemoTaggedEntry, demo_tagged_entry, GTK_TYPE_WIDGET,
+                         G_ADD_PRIVATE (DemoTaggedEntry)
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_EDITABLE, demo_tagged_entry_editable_init))
+
+static void
+demo_tagged_entry_init (DemoTaggedEntry *entry)
+{
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  priv->box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+  gtk_widget_set_parent (priv->box, GTK_WIDGET (entry));
+
+  priv->entry = gtk_text_new ();
+  gtk_widget_set_hexpand (priv->entry, TRUE);
+  gtk_widget_set_vexpand (priv->entry, TRUE);
+  gtk_widget_set_hexpand (priv->box, FALSE);
+  gtk_widget_set_vexpand (priv->box, FALSE);
+  gtk_container_add (GTK_CONTAINER (priv->box), priv->entry);
+  gtk_editable_init_delegate (GTK_EDITABLE (entry));
+}
+
+static void
+demo_tagged_entry_dispose (GObject *object)
+{
+  DemoTaggedEntry *entry = DEMO_TAGGED_ENTRY (object);
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  if (priv->entry)
+    gtk_editable_finish_delegate (GTK_EDITABLE (entry));
+
+  g_clear_pointer (&priv->entry, gtk_widget_unparent);
+  g_clear_pointer (&priv->box, gtk_widget_unparent);
+
+  G_OBJECT_CLASS (demo_tagged_entry_parent_class)->dispose (object);
+}
+
+static void
+demo_tagged_entry_finalize (GObject *object)
+{
+  G_OBJECT_CLASS (demo_tagged_entry_parent_class)->finalize (object);
+}
+
+static void
+demo_tagged_entry_set_property (GObject      *object,
+                                guint         prop_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  if (gtk_editable_delegate_set_property (object, prop_id, value, pspec))
+    return;
+
+  G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+}
+
+static void
+demo_tagged_entry_get_property (GObject    *object,
+                                guint       prop_id,
+                                GValue     *value,
+                                GParamSpec *pspec)
+{
+  if (gtk_editable_delegate_get_property (object, prop_id, value, pspec))
+    return;
+
+  G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+}
+
+static void
+demo_tagged_entry_measure (GtkWidget      *widget,
+                           GtkOrientation  orientation,
+                           int             for_size,
+                           int            *minimum,
+                           int            *natural,
+                           int            *minimum_baseline,
+                           int            *natural_baseline)
+{
+  DemoTaggedEntry *entry = DEMO_TAGGED_ENTRY (widget);
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  gtk_widget_measure (priv->box, orientation, for_size,
+                      minimum, natural,
+                      minimum_baseline, natural_baseline);
+}
+
+static void
+demo_tagged_entry_size_allocate (GtkWidget *widget,
+                                 int        width,
+                                 int        height,
+                                 int        baseline)
+{
+  DemoTaggedEntry *entry = DEMO_TAGGED_ENTRY (widget);
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  gtk_widget_size_allocate (priv->box,
+                            &(GtkAllocation) { 0, 0, width, height },
+                            baseline);
+}
+
+static void
+demo_tagged_entry_grab_focus (GtkWidget *widget)
+{
+  DemoTaggedEntry *entry = DEMO_TAGGED_ENTRY (widget);
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  gtk_widget_grab_focus (priv->entry);
+}
+
+static void
+demo_tagged_entry_class_init (DemoTaggedEntryClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  object_class->dispose = demo_tagged_entry_dispose;
+  object_class->finalize = demo_tagged_entry_finalize;
+  object_class->get_property = demo_tagged_entry_get_property;
+  object_class->set_property = demo_tagged_entry_set_property;
+
+  widget_class->measure = demo_tagged_entry_measure;
+  widget_class->size_allocate = demo_tagged_entry_size_allocate;
+  widget_class->grab_focus = demo_tagged_entry_grab_focus;
+ 
+  gtk_editable_install_properties (object_class, 1);
+
+  gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_ENTRY_ACCESSIBLE);
+  gtk_widget_class_set_css_name (widget_class, "entry");
+}
+
+static GtkEditable *
+demo_tagged_entry_get_delegate (GtkEditable *editable)
+{
+  DemoTaggedEntry *entry = DEMO_TAGGED_ENTRY (editable);
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  return GTK_EDITABLE (priv->entry);
+}
+
+static void
+demo_tagged_entry_editable_init (GtkEditableInterface *iface)
+{
+  iface->get_delegate = demo_tagged_entry_get_delegate;
+}
+
+GtkWidget *
+demo_tagged_entry_new (void)
+{
+  return GTK_WIDGET (g_object_new (DEMO_TYPE_TAGGED_ENTRY, NULL));
+}
+
+void
+demo_tagged_entry_add_tag (DemoTaggedEntry *entry,
+                           GtkWidget       *tag)
+{
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  g_return_if_fail (DEMO_IS_TAGGED_ENTRY (entry));
+
+  gtk_container_add (GTK_CONTAINER (priv->box), tag);
+}
+
+void
+demo_tagged_entry_insert_tag_after (DemoTaggedEntry *entry,
+                                    GtkWidget       *tag,
+                                    GtkWidget       *sibling)
+{
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  g_return_if_fail (DEMO_IS_TAGGED_ENTRY (entry));
+
+  if (sibling == NULL)
+    gtk_container_add (GTK_CONTAINER (priv->box), tag);
+  else
+    gtk_box_insert_child_after (GTK_BOX (priv->box), tag, sibling); 
+}
+
+void
+demo_tagged_entry_remove_tag (DemoTaggedEntry *entry,
+                              GtkWidget       *tag)
+{
+  DemoTaggedEntryPrivate *priv = demo_tagged_entry_get_instance_private (entry);
+
+  g_return_if_fail (DEMO_IS_TAGGED_ENTRY (entry));
+
+  gtk_container_remove (GTK_CONTAINER (priv->box), tag);
+}
+
+struct _DemoTaggedEntryTag
+{
+  GtkWidget parent;
+  GtkWidget *box;
+  GtkWidget *label;
+  GtkWidget *button;
+
+  gboolean has_close_button;
+  char *style;
+};
+
+struct _DemoTaggedEntryTagClass
+{
+  GtkWidgetClass parent_class;
+};
+
+enum {
+  PROP_0,
+  PROP_LABEL,
+  PROP_HAS_CLOSE_BUTTON,
+};
+
+enum {
+  SIGNAL_CLICKED,
+  SIGNAL_BUTTON_CLICKED,
+  LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL] = { 0, };
+
+G_DEFINE_TYPE (DemoTaggedEntryTag, demo_tagged_entry_tag, GTK_TYPE_WIDGET)
+
+static void
+on_released (GtkGestureClick      *gesture,
+             int                   n_press,
+             double                x,
+             double                y,
+             DemoTaggedEntryTag   *tag)
+{
+  g_signal_emit (tag, signals[SIGNAL_CLICKED], 0);
+}
+
+static void
+demo_tagged_entry_tag_init (DemoTaggedEntryTag *tag)
+{
+  GtkGesture *gesture;
+  GtkCssProvider *provider;
+
+  tag->box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+  gtk_widget_set_parent (tag->box, GTK_WIDGET (tag));
+  tag->label = gtk_label_new ("");
+  gtk_container_add (GTK_CONTAINER (tag->box), tag->label);
+
+  gesture = gtk_gesture_click_new ();
+  g_signal_connect (gesture, "released", G_CALLBACK (on_released), tag);
+  gtk_widget_add_controller (GTK_WIDGET (tag), GTK_EVENT_CONTROLLER (gesture));
+
+  provider = gtk_css_provider_new ();
+  gtk_css_provider_load_from_resource (provider, "/tagged_entry/tagstyle.css");
+  gtk_style_context_add_provider_for_display (gdk_display_get_default (),
+                                              GTK_STYLE_PROVIDER (provider),
+                                              800);
+  g_object_unref (provider);
+}
+
+static void
+demo_tagged_entry_tag_dispose (GObject *object)
+{
+  DemoTaggedEntryTag *tag = DEMO_TAGGED_ENTRY_TAG (object);
+
+  g_clear_pointer (&tag->box, gtk_widget_unparent);
+
+  G_OBJECT_CLASS (demo_tagged_entry_tag_parent_class)->dispose (object);
+}
+
+static void
+demo_tagged_entry_tag_finalize (GObject *object)
+{
+  DemoTaggedEntryTag *tag = DEMO_TAGGED_ENTRY_TAG (object);
+
+  g_clear_pointer (&tag->box, gtk_widget_unparent);
+  g_clear_pointer (&tag->style, g_free);
+
+  G_OBJECT_CLASS (demo_tagged_entry_tag_parent_class)->finalize (object);
+}
+
+static void
+demo_tagged_entry_tag_set_property (GObject      *object,
+                                    guint         prop_id,
+                                    const GValue *value,
+                                    GParamSpec   *pspec)
+{
+  DemoTaggedEntryTag *tag = DEMO_TAGGED_ENTRY_TAG (object);
+
+  switch (prop_id)
+    {
+    case PROP_LABEL:
+      demo_tagged_entry_tag_set_label (tag, g_value_get_string (value));
+      break;
+
+    case PROP_HAS_CLOSE_BUTTON:
+      demo_tagged_entry_tag_set_has_close_button (tag, g_value_get_boolean (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+demo_tagged_entry_tag_get_property (GObject    *object,
+                                    guint       prop_id,
+                                    GValue     *value,
+                                    GParamSpec *pspec)
+{
+  DemoTaggedEntryTag *tag = DEMO_TAGGED_ENTRY_TAG (object);
+
+  switch (prop_id)
+    {
+    case PROP_LABEL:
+      g_value_set_string (value, demo_tagged_entry_tag_get_label (tag));
+      break;
+
+    case PROP_HAS_CLOSE_BUTTON:
+      g_value_set_boolean (value, demo_tagged_entry_tag_get_has_close_button (tag));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+demo_tagged_entry_tag_measure (GtkWidget      *widget,
+                               GtkOrientation  orientation,
+                               int             for_size,
+                               int            *minimum,
+                               int            *natural,
+                               int            *minimum_baseline,
+                               int            *natural_baseline)
+{
+  DemoTaggedEntryTag *tag = DEMO_TAGGED_ENTRY_TAG (widget);
+
+  gtk_widget_measure (tag->box, orientation, for_size,
+                      minimum, natural,
+                      minimum_baseline, natural_baseline);
+}
+
+static void
+demo_tagged_entry_tag_size_allocate (GtkWidget *widget,
+                                     int        width,
+                                     int        height,
+                                     int        baseline)
+{
+  DemoTaggedEntryTag *tag = DEMO_TAGGED_ENTRY_TAG (widget);
+
+  gtk_widget_size_allocate (tag->box,
+                            &(GtkAllocation) { 0, 0, width, height },
+                            baseline);
+}
+
+static void
+demo_tagged_entry_tag_class_init (DemoTaggedEntryTagClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+  object_class->dispose = demo_tagged_entry_tag_dispose;
+  object_class->finalize = demo_tagged_entry_tag_finalize;
+  object_class->set_property = demo_tagged_entry_tag_set_property;
+  object_class->get_property = demo_tagged_entry_tag_get_property;
+
+  widget_class->measure = demo_tagged_entry_tag_measure;
+  widget_class->size_allocate = demo_tagged_entry_tag_size_allocate;
+
+  signals[SIGNAL_CLICKED] =
+      g_signal_new ("clicked",
+                    DEMO_TYPE_TAGGED_ENTRY_TAG,
+                    G_SIGNAL_RUN_FIRST,
+                    0, NULL, NULL, NULL,
+                    G_TYPE_NONE, 0);
+  signals[SIGNAL_BUTTON_CLICKED] =
+      g_signal_new ("button-clicked",
+                    DEMO_TYPE_TAGGED_ENTRY_TAG,
+                    G_SIGNAL_RUN_FIRST,
+                    0, NULL, NULL, NULL,
+                    G_TYPE_NONE, 0);
+
+  g_object_class_install_property (object_class, PROP_LABEL,
+      g_param_spec_string ("label", "Label", "Label",
+                           NULL, G_PARAM_READWRITE));
+  g_object_class_install_property (object_class, PROP_HAS_CLOSE_BUTTON,
+      g_param_spec_boolean ("has-close-button", "Has close button", "Whether this tag has a close button",
+                            FALSE, G_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
+
+  gtk_widget_class_set_css_name (widget_class, "tag");
+}
+
+DemoTaggedEntryTag *
+demo_tagged_entry_tag_new (const char *label)
+{
+  return DEMO_TAGGED_ENTRY_TAG (g_object_new (DEMO_TYPE_TAGGED_ENTRY_TAG,
+                                              "label", label,
+                                              NULL));
+}
+
+const char *
+demo_tagged_entry_tag_get_label (DemoTaggedEntryTag *tag)
+{
+  g_return_val_if_fail (DEMO_IS_TAGGED_ENTRY_TAG (tag), NULL);
+
+  return gtk_label_get_label (GTK_LABEL (tag->label));
+}
+
+void
+demo_tagged_entry_tag_set_label (DemoTaggedEntryTag *tag,
+                                 const char         *label)
+{
+  g_return_if_fail (DEMO_IS_TAGGED_ENTRY_TAG (tag));
+
+  gtk_label_set_label (GTK_LABEL (tag->label), label);
+}
+
+static void
+on_button_clicked (GtkButton          *button,
+                   DemoTaggedEntryTag *tag)
+{
+  g_signal_emit (tag, signals[SIGNAL_BUTTON_CLICKED], 0);
+}
+
+void
+demo_tagged_entry_tag_set_has_close_button (DemoTaggedEntryTag *tag,
+                                            gboolean            has_close_button)
+{
+  g_return_if_fail (DEMO_IS_TAGGED_ENTRY_TAG (tag));
+
+  if ((tag->button != NULL) == has_close_button)
+    return;
+
+  if (!has_close_button && tag->button)
+    {
+      gtk_container_remove (GTK_CONTAINER (tag->box), tag->button);
+      tag->button = NULL;
+    }
+  else if (has_close_button && tag->button == NULL)
+    {
+      GtkWidget *image;
+
+      image = gtk_image_new_from_icon_name ("window-close-symbolic");
+      tag->button = gtk_button_new ();
+      gtk_container_add (GTK_CONTAINER (tag->button), image);
+      gtk_widget_set_halign (tag->button, GTK_ALIGN_CENTER);
+      gtk_widget_set_valign (tag->button, GTK_ALIGN_CENTER);
+      gtk_button_set_relief (GTK_BUTTON (tag->button), GTK_RELIEF_NONE);
+      gtk_container_add (GTK_CONTAINER (tag->box), tag->button);
+      g_signal_connect (tag->button, "clicked", G_CALLBACK (on_button_clicked), tag);
+    }
+
+  g_object_notify (G_OBJECT (tag), "has-close-button");
+}
+
+gboolean
+demo_tagged_entry_tag_get_has_close_button (DemoTaggedEntryTag *tag)
+{
+  g_return_val_if_fail (DEMO_IS_TAGGED_ENTRY_TAG (tag), FALSE);
+
+  return tag->button != NULL;
+}

demos/gtk-demo/demotaggedentry.h

@@ -0,0 +1,89 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 2019 Red Hat, Inc.
+ *
+ * Authors:
+ * - Matthias Clasen <mclasen@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __DEMO_TAGGED_ENTRY_H__
+#define __DEMO_TAGGED_ENTRY_H__
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define DEMO_TYPE_TAGGED_ENTRY                 (demo_tagged_entry_get_type ())
+#define DEMO_TAGGED_ENTRY(obj)                 (G_TYPE_CHECK_INSTANCE_CAST ((obj), DEMO_TYPE_TAGGED_ENTRY, DemoTaggedEntry))
+#define DEMO_TAGGED_ENTRY_CLASS(klass)         (G_TYPE_CHECK_CLASS_CAST ((klass), DEMO_TYPE_TAGGED_ENTRY, DemoTaggedEntryClass))
+#define DEMO_IS_TAGGED_ENTRY(obj)              (G_TYPE_CHECK_INSTANCE_TYPE ((obj), DEMO_TYPE_TAGGED_ENTRY))
+#define DEMO_IS_TAGGED_ENTRY_CLASS(klass)      (G_TYPE_CHECK_CLASS_TYPE ((klass), DEMO_TYPE_TAGGED_ENTRY))
+#define DEMO_TAGGED_ENTRY_GET_CLASS(obj)       (G_TYPE_INSTANCE_GET_CLASS ((obj), DEMO_TYPE_TAGGED_ENTRY, DemoTaggedEntryClass))
+
+typedef struct _DemoTaggedEntry       DemoTaggedEntry;
+typedef struct _DemoTaggedEntryClass  DemoTaggedEntryClass;
+
+struct _DemoTaggedEntry
+{
+  GtkWidget parent;
+};
+
+struct _DemoTaggedEntryClass
+{
+  GtkWidgetClass parent_class;
+};
+
+#define DEMO_TYPE_TAGGED_ENTRY_TAG                (demo_tagged_entry_tag_get_type ())
+#define DEMO_TAGGED_ENTRY_TAG(obj)                (G_TYPE_CHECK_INSTANCE_CAST ((obj), DEMO_TYPE_TAGGED_ENTRY_TAG, DemoTaggedEntryTag))
+#define DEMO_TAGGED_ENTRY_TAG_CLASS(klass)        (G_TYPE_CHECK_CLASS_CAST ((klass), DEMO_TYPE_TAGGED_ENTRY_TAG, DemoTaggedEntryTag))
+#define DEMO_IS_TAGGED_ENTRY_TAG(obj)             (G_TYPE_CHECK_INSTANCE_TYPE ((obj), DEMO_TYPE_TAGGED_ENTRY_TAG))
+#define DEMO_IS_TAGGED_ENTRY_TAG_CLASS(klass)     (G_TYPE_CHECK_CLASS_TYPE ((klass), DEMO_TYPE_TAGGED_ENTRY_TAG))
+#define DEMO_TAGGED_ENTRY_TAG_GET_CLASS(obj)      (G_TYPE_INSTANCE_GET_CLASS ((obj), DEMO_TYPE_TAGGED_ENTRY_TAG, DemoTaggedEntryTagClass))
+
+typedef struct _DemoTaggedEntryTag       DemoTaggedEntryTag;
+typedef struct _DemoTaggedEntryTagClass  DemoTaggedEntryTagClass;
+
+
+GType           demo_tagged_entry_get_type (void) G_GNUC_CONST;
+GType           demo_tagged_entry_tag_get_type (void) G_GNUC_CONST;
+
+GtkWidget *     demo_tagged_entry_new     (void);
+
+void            demo_tagged_entry_add_tag (DemoTaggedEntry *entry,
+                                           GtkWidget       *tag);
+
+void            demo_tagged_entry_insert_tag_after (DemoTaggedEntry *entry,
+                                                    GtkWidget       *tag,
+                                                    GtkWidget       *sibling);
+
+void            demo_tagged_entry_remove_tag (DemoTaggedEntry *entry,
+                                              GtkWidget       *tag);
+
+DemoTaggedEntryTag *
+                demo_tagged_entry_tag_new (const char *label);
+
+const char *    demo_tagged_entry_tag_get_label (DemoTaggedEntryTag *tag);
+
+void            demo_tagged_entry_tag_set_label (DemoTaggedEntryTag *tag,
+                                                 const char         *label);
+
+gboolean        demo_tagged_entry_tag_get_has_close_button (DemoTaggedEntryTag *tag);
+
+void            demo_tagged_entry_tag_set_has_close_button (DemoTaggedEntryTag *tag,
+                                                            gboolean            has_close_button);
+
+G_END_DECLS
+
+#endif /* __DEMO_TAGGED_ENTRY_H__ */

demos/gtk-demo/dnd.c

@@ -196,7 +196,7 @@ edit_label_done (GtkWidget *entry, gpointer data)
   GtkWidget *label;
   int x, y;
 
-  gtk_container_child_get (GTK_CONTAINER (fixed), entry, "x", &x, "y", &y, NULL);
+  gtk_fixed_get_child_position (GTK_FIXED (fixed), entry, &x, &y);
 
   label = GTK_WIDGET (g_object_get_data (G_OBJECT (entry), "label"));
   gtk_label_set_text (GTK_LABEL (label), gtk_editable_get_text (GTK_EDITABLE (entry)));
@@ -210,7 +210,7 @@ edit_cb (GtkWidget *child)
   GtkWidget *fixed = gtk_widget_get_parent (child);
   int x, y;
 
-  gtk_container_child_get (GTK_CONTAINER (fixed), child, "x", &x, "y", &y, NULL);
+  gtk_fixed_get_child_position (GTK_FIXED (fixed), child, &x, &y);
 
   if (GTK_IS_LABEL (child))
     {
@@ -243,7 +243,7 @@ pressed_cb (GtkGesture *gesture,
   GtkWidget *child;
 
   widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
-  child = gtk_widget_pick (widget, x, y);
+  child = gtk_widget_pick (widget, x, y, GTK_PICK_DEFAULT);
 
   if (gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)) == GDK_BUTTON_SECONDARY)
     {
@@ -299,7 +299,7 @@ pressed_cb (GtkGesture *gesture,
       rect.height = 0;
 
       gtk_menu_popup_at_rect (GTK_MENU (menu),
-                              gtk_widget_get_surface (widget),
+                              gtk_native_get_surface (gtk_widget_get_native (widget)),
                               &rect,
                               GDK_GRAVITY_NORTH_WEST,
                               GDK_GRAVITY_NORTH_WEST,
@@ -320,7 +320,7 @@ released_cb (GtkGesture *gesture,
   GtkWidget *child;
 
   widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
-  child = gtk_widget_pick (widget, x, y);
+  child = gtk_widget_pick (widget, x, y, 0);
 
   if (gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)) == GDK_BUTTON_PRIMARY)
     {
@@ -356,7 +356,7 @@ do_dnd (GtkWidget *do_widget)
       gtk_widget_set_hexpand (fixed, TRUE);
       gtk_widget_set_vexpand (fixed, TRUE);
 
-      multipress = gtk_gesture_multi_press_new ();
+      multipress = gtk_gesture_click_new ();
       gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (multipress), 0);
       g_signal_connect (multipress, "pressed", G_CALLBACK (pressed_cb), NULL);
       g_signal_connect (multipress, "released", G_CALLBACK (released_cb), NULL);

demos/gtk-demo/expander.c

@@ -31,13 +31,14 @@ do_expander (GtkWidget *do_widget)
   GtkWidget *toplevel;
   GtkWidget *area;
   GtkWidget *expander;
+  GtkWidget *label;
   GtkWidget *sw;
   GtkWidget *tv;
   GtkTextBuffer *buffer;
 
   if (!window)
     {
-      toplevel = gtk_widget_get_toplevel (do_widget);
+      toplevel = GTK_WIDGET (gtk_widget_get_root (do_widget));
       window = gtk_message_dialog_new_with_markup (GTK_WINDOW (toplevel),
                                                    0,
                                                    GTK_MESSAGE_ERROR,
@@ -50,13 +51,19 @@ do_expander (GtkWidget *do_widget)
 
       area = gtk_message_dialog_get_message_area (GTK_MESSAGE_DIALOG (window));
 
+      label = gtk_widget_get_last_child (area);
+      gtk_label_set_line_wrap (GTK_LABEL (label), FALSE);
+      gtk_widget_set_vexpand (label, FALSE);
+
       expander = gtk_expander_new ("Details:");
+      gtk_widget_set_vexpand (expander, TRUE);
       sw = gtk_scrolled_window_new (NULL, NULL);
       gtk_scrolled_window_set_min_content_height (GTK_SCROLLED_WINDOW (sw), 100);
       gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sw), GTK_SHADOW_IN);
       gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                                       GTK_POLICY_NEVER,
                                       GTK_POLICY_AUTOMATIC);
+      gtk_scrolled_window_set_propagate_natural_height (GTK_SCROLLED_WINDOW (sw), TRUE);
 
       tv = gtk_text_view_new ();
       buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (tv));

demos/gtk-demo/filtermodel.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <requires lib="gtk+" version="3.16"/>
   <object class="GtkListStore" id="liststore1">
@@ -44,11 +45,11 @@
             <accessibility>
               <relation type="label-for" target="treeview1"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkTreeView" id="treeview1">
@@ -83,11 +84,11 @@
             <accessibility>
               <relation type="labelled-by" target="label1"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
         <child>
           <object class="GtkTreeView" id="treeview2">
@@ -134,11 +135,11 @@
             <accessibility>
               <relation type="labelled-by" target="label2"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
         <child>
           <object class="GtkLabel" id="label2">
@@ -150,11 +151,11 @@
             <accessibility>
               <relation type="label-for" target="treeview2"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkLabel" id="label3">
@@ -166,11 +167,11 @@
             <accessibility>
               <relation type="label-for" target="treeview3"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
         <child>
           <object class="GtkTreeView" id="treeview3">
@@ -199,11 +200,11 @@
             <accessibility>
               <relation type="labelled-by" target="label3"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">3</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">3</property>
-          </packing>
         </child>
       </object>
     </child>

demos/gtk-demo/fishbowl.c

@@ -164,6 +164,26 @@ create_switch (void)
   return w;
 }
 
+static void
+mapped (GtkWidget *w)
+{
+  gtk_menu_button_popup (GTK_MENU_BUTTON (w));
+}
+
+static GtkWidget *
+create_menu_button (void)
+{
+  GtkWidget *w = gtk_menu_button_new ();
+  GtkWidget *popover = gtk_popover_new (NULL);
+
+  gtk_container_add (GTK_CONTAINER (popover), gtk_button_new_with_label ("Hey!"));
+  gtk_popover_set_autohide (GTK_POPOVER (popover), FALSE);
+  gtk_menu_button_set_popover (GTK_MENU_BUTTON (w), popover);
+  g_signal_connect (w, "map", G_CALLBACK (mapped), NULL);
+
+  return w;
+}
+
 static const struct {
   const char *name;
   GtkWidget * (*create_func) (void);
@@ -179,6 +199,7 @@ static const struct {
   { "Video",      create_video          },
   { "Gears",      create_gears          },
   { "Switch",     create_switch         },
+  { "Menubutton", create_menu_button    },
 };
 
 static int selected_widget_type = -1;
@@ -198,7 +219,7 @@ set_widget_type (GtkFishbowl *fishbowl,
   gtk_fishbowl_set_creation_func (fishbowl,
                                   widget_types[selected_widget_type].create_func);
 
-  window = gtk_widget_get_toplevel (GTK_WIDGET (fishbowl));
+  window = GTK_WIDGET (gtk_widget_get_root (GTK_WIDGET (fishbowl)));
   headerbar = gtk_window_get_titlebar (GTK_WINDOW (window));
   gtk_header_bar_set_title (GTK_HEADER_BAR (headerbar),
                             widget_types[selected_widget_type].name);
@@ -234,6 +255,15 @@ prev_button_clicked_cb (GtkButton *source,
   set_widget_type (fishbowl, new_index);
 }
 
+void
+changes_toggled_cb (GtkToggleButton *button,
+                    gpointer         user_data)
+{
+  if (gtk_toggle_button_get_active (button))
+    gtk_button_set_icon_name (GTK_BUTTON (button), "changes-prevent");
+  else
+    gtk_button_set_icon_name (GTK_BUTTON (button), "changes-allow");
+}
 
 GtkWidget *
 do_fishbowl (GtkWidget *do_widget)
@@ -261,6 +291,7 @@ do_fishbowl (GtkWidget *do_widget)
       gtk_builder_add_callback_symbols (builder,
                                         "next_button_clicked_cb", G_CALLBACK (next_button_clicked_cb),
                                         "prev_button_clicked_cb", G_CALLBACK (prev_button_clicked_cb),
+                                        "changes_toggled_cb", G_CALLBACK (changes_toggled_cb),
                                         NULL);
       gtk_builder_connect_signals (builder, NULL);
       window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
@@ -275,6 +306,7 @@ do_fishbowl (GtkWidget *do_widget)
                         G_CALLBACK (gtk_widget_destroyed), &window);
 
       gtk_widget_realize (window);
+      g_object_unref (builder);
     }
 
   if (!gtk_widget_get_visible (window))

demos/gtk-demo/fishbowl.ui

@@ -1,6 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkWindow" id="window">
     <property name="title" translatable="yes">Fishbowl</property>
+    <property name="default-width">400</property>
+    <property name="default-height">400</property>
     <child type="titlebar">
       <object class="GtkHeaderBar" id="">
         <property name="show-title-buttons">1</property>
@@ -23,58 +26,32 @@
             </child>
           </object>
         </child>
-        <child>
+        <child type="end">
           <object class="GtkLabel">
             <property name="label">fps</property>
           </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
-        <child>
+        <child type="end">
           <object class="GtkLabel">
-            <property name="label" bind-source="bowl" bind-property="framerate"/>
+            <property name="label" bind-source="bowl" bind-property="framerate-string"/>
           </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
-        <child>
+        <child type="end">
           <object class="GtkLabel">
             <property name="label">Icons, </property>
           </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
-        <child>
+        <child type="end">
           <object class="GtkLabel">
             <property name="label" bind-source="bowl" bind-property="count"/>
           </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
-        <child>
+        <child type="end">
           <object class="GtkToggleButton" id="changes_allow">
-            <property name="visible" bind-source="changes_allow" bind-property="active" bind-flags="invert-boolean"/>
             <property name="icon-name">changes-allow</property>
             <property name="relief">none</property>
+            <signal name="notify::active" handler="changes_toggled_cb"/>
           </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
-        </child>
-        <child>
-          <object class="GtkToggleButton" id="changes_prevent">
-            <property name="active" bind-source="changes_allow" bind-property="active" bind-flags="bidirectional|invert-boolean">1</property>
-            <property name="visible" bind-source="changes_prevent" bind-property="active" bind-flags="invert-boolean">0</property>
-            <property name="icon-name">changes-prevent</property>
-            <property name="relief">none</property>
-          </object>
-          <packing>
-            <property name="pack-type">end</property>
-          </packing>
         </child>
       </object>
     </child>
@@ -82,7 +59,7 @@
       <object class="GtkFishbowl" id="bowl">
         <property name="visible">True</property>
         <property name="animating">True</property>
-        <property name="benchmark" bind-source="changes_allow" bind-property="active" bind-flags="invert-boolean">1</property>
+        <property name="benchmark" bind-source="changes_allow" bind-property="active" bind-flags="invert-boolean | sync-create"/>
       </object>
     </child>
   </object>

demos/gtk-demo/fixed.c

@@ -0,0 +1,167 @@
+/* Fixed layout
+ *
+ * GtkFixed is a container that allows placing and transforming
+ * widgets manually.
+ */
+
+#include <gtk/gtk.h>
+
+/* This enumeration determines the paint order */
+enum {
+  FACE_BACK,
+  FACE_LEFT,
+  FACE_BOTTOM,
+  FACE_RIGHT,
+  FACE_TOP,
+  FACE_FRONT,
+
+  N_FACES
+};
+
+/* Map face widgets to CSS classes */
+static struct {
+  GtkWidget *face;
+  const char *css_class;
+} faces[N_FACES] = {
+  [FACE_BACK] = { NULL, "back", },
+  [FACE_LEFT] = { NULL, "left", },
+  [FACE_RIGHT] = { NULL, "right", },
+  [FACE_TOP] = { NULL, "top", },
+  [FACE_BOTTOM] = { NULL, "bottom", },
+  [FACE_FRONT] = { NULL, "front", },
+};
+
+static GtkWidget *
+create_faces (void)
+{
+  GtkWidget *fixed = gtk_fixed_new ();
+  int face_size = 200;
+  float w, h, d, p;
+
+  gtk_widget_set_overflow (fixed, GTK_OVERFLOW_VISIBLE);
+
+  w = (float) face_size / 2.f;
+  h = (float) face_size / 2.f;
+  d = (float) face_size / 2.f;
+  p = face_size * 3.f;
+
+  for (int i = 0; i < N_FACES; i++)
+    {
+      GskTransform *transform = NULL;
+
+      /* Add a face */
+      faces[i].face = gtk_frame_new (NULL);
+      gtk_widget_set_size_request (faces[i].face, face_size, face_size);
+      gtk_style_context_add_class (gtk_widget_get_style_context (faces[i].face), faces[i].css_class);
+      gtk_container_add (GTK_CONTAINER (fixed), faces[i].face);
+
+      /* Set up the transformation for each face */
+      transform = gsk_transform_translate (transform, &GRAPHENE_POINT_INIT (w, h));
+      transform = gsk_transform_perspective (transform, p);
+      transform = gsk_transform_rotate_3d (transform, -30.f, graphene_vec3_x_axis ());
+      transform = gsk_transform_rotate_3d (transform, 135.f, graphene_vec3_y_axis ());
+      transform = gsk_transform_translate_3d (transform, &GRAPHENE_POINT3D_INIT (0, 0, -face_size / 6.f));
+
+      switch (i)
+        {
+        case FACE_FRONT:
+          transform = gsk_transform_rotate_3d (transform, 0.f, graphene_vec3_y_axis ());
+          break;
+
+        case FACE_BACK:
+          transform = gsk_transform_rotate_3d (transform, -180.f, graphene_vec3_y_axis ());
+          break;
+
+        case FACE_RIGHT:
+          transform = gsk_transform_rotate_3d (transform, 90.f, graphene_vec3_y_axis ());
+          break;
+
+        case FACE_LEFT:
+          transform = gsk_transform_rotate_3d (transform, -90.f, graphene_vec3_y_axis ());
+          break;
+
+        case FACE_TOP:
+          transform = gsk_transform_rotate_3d (transform, 90.f, graphene_vec3_x_axis ());
+          break;
+
+        case FACE_BOTTOM:
+          transform = gsk_transform_rotate_3d (transform, -90.f, graphene_vec3_x_axis ());
+          break;
+
+        default:
+          break;
+        }
+
+      transform = gsk_transform_translate_3d (transform, &GRAPHENE_POINT3D_INIT (0, 0, d));
+      transform = gsk_transform_translate_3d (transform, &GRAPHENE_POINT3D_INIT (-w, -h, 0));
+
+      gtk_fixed_set_child_transform (GTK_FIXED (fixed), faces[i].face, transform);
+      gsk_transform_unref (transform);
+    }
+
+  return fixed;
+}
+
+static GtkWidget *demo_window = NULL;
+static GtkCssProvider *provider = NULL;
+
+static void
+close_window (GtkWidget *widget)
+{
+  /* Reset the state */
+  for (int i = 0; i < N_FACES; i++)
+    faces[i].face = NULL;
+
+  gtk_style_context_remove_provider_for_display (gdk_display_get_default (),
+                                                 GTK_STYLE_PROVIDER (provider));
+  provider = NULL;
+
+  demo_window = NULL;
+}
+
+static GtkWidget *
+create_demo_window (GtkWidget *do_widget)
+{
+  GtkWidget *window, *sw, *fixed, *cube;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_display (GTK_WINDOW (window),  gtk_widget_get_display (do_widget));
+  gtk_window_set_title (GTK_WINDOW (window), "Fixed layout");
+  gtk_window_set_default_size (GTK_WINDOW (window), 600, 400);
+  g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);
+
+  sw = gtk_scrolled_window_new (NULL, NULL);
+  gtk_container_add (GTK_CONTAINER (window), sw);
+
+  fixed = gtk_fixed_new ();
+  gtk_container_add (GTK_CONTAINER (sw), fixed);
+  gtk_widget_set_halign (GTK_WIDGET (fixed), GTK_ALIGN_CENTER);
+  gtk_widget_set_valign (GTK_WIDGET (fixed), GTK_ALIGN_CENTER);
+
+  cube = create_faces ();
+  gtk_container_add (GTK_CONTAINER (fixed), cube);
+  gtk_widget_set_overflow (fixed, GTK_OVERFLOW_VISIBLE);
+
+  provider = gtk_css_provider_new ();
+  gtk_css_provider_load_from_resource (provider, "/fixed/fixed.css");
+  gtk_style_context_add_provider_for_display (gdk_display_get_default (),
+                                              GTK_STYLE_PROVIDER (provider),
+                                              800);
+  g_object_unref (provider);
+
+  return window;
+}
+
+GtkWidget*
+do_fixed (GtkWidget *do_widget)
+{
+  if (demo_window == NULL)
+    demo_window = create_demo_window (do_widget);
+
+  if (!gtk_widget_get_visible (demo_window))
+    gtk_widget_show (demo_window);
+  else
+    gtk_widget_destroy (demo_window);
+
+  return demo_window;
+}

demos/gtk-demo/fixed.css

@@ -0,0 +1,29 @@
+frame.front {
+  border: 2px solid white;
+  background-color: rgba(228, 0, 0, 0.8);
+}
+
+frame.back {
+  border: 2px solid white;
+  background-color: rgba(228, 0, 0, 0.8);
+}
+
+frame.right {
+  border: 2px solid white;
+  background-color: rgba(127, 231, 25, 0.8);
+}
+
+frame.left {
+  border: 2px solid white;
+  background-color: rgba(127, 231, 25, 0.8);
+}
+
+frame.top {
+  border: 2px solid white;
+  background-color: rgba(114, 159, 207, 0.8);
+}
+
+frame.bottom {
+  border: 2px solid white;
+  background-color: rgba(114, 159, 207, 0.8);
+}

demos/gtk-demo/font-features.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <requires lib="gtk+" version="3.12"/>
   <object class="GtkWindow" id="window">

demos/gtk-demo/font_features.c

@@ -495,7 +495,11 @@ update_script_combo (void)
   gboolean have_active = FALSE;
 
   lang = gtk_font_chooser_get_language (GTK_FONT_CHOOSER (font));
+
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS
   active = hb_ot_tag_from_language (hb_language_from_string (lang, -1));
+  G_GNUC_END_IGNORE_DEPRECATIONS
+
   g_free (lang);
 
   store = gtk_list_store_new (4, G_TYPE_STRING, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_UINT);
@@ -1665,7 +1669,7 @@ toggle_edit (void)
 static void
 stop_edit (void)
 {
-  gtk_button_clicked (GTK_BUTTON (edit_toggle));
+  g_signal_emit_by_name (edit_toggle, "clicked");
 }
 
 static gboolean

demos/gtk-demo/fontplane.c

@@ -209,7 +209,6 @@ gtk_font_plane_init (GtkFontPlane *plane)
 {
   GtkGesture *gesture;
 
-  gtk_widget_set_has_surface (GTK_WIDGET (plane), FALSE);
   gtk_widget_set_can_focus (GTK_WIDGET (plane), TRUE);
 
   gesture = gtk_gesture_drag_new ();

demos/gtk-demo/fontrendering.c

@@ -0,0 +1,288 @@
+/* Pango/Font rendering
+ *
+ * Demonstrates various aspects of font rendering.
+ */
+
+#include <gtk/gtk.h>
+
+static GtkWidget *window = NULL;
+static GtkWidget *font_button = NULL;
+static GtkWidget *entry = NULL;
+static GtkWidget *image = NULL;
+static GtkWidget *hinting = NULL;
+static GtkWidget *hint_metrics = NULL;
+static GtkWidget *up_button = NULL;
+static GtkWidget *down_button = NULL;
+static GtkWidget *text_radio = NULL;
+static GtkWidget *show_grid = NULL;
+static GtkWidget *show_extents = NULL;
+
+static PangoContext *context;
+
+static int scale = 10;
+
+static void
+on_destroy (gpointer data)
+{
+  window = NULL;
+}
+
+static void
+update_image (void)
+{
+  const char *text;
+  PangoFontDescription *desc;
+  PangoLayout *layout;
+  PangoRectangle ink, pink, logical;
+  int baseline;
+  cairo_surface_t *surface;
+  cairo_t *cr;
+  GdkPixbuf *pixbuf;
+  GdkPixbuf *pixbuf2;
+  const char *hint;
+  cairo_font_options_t *fopt;
+  cairo_hint_style_t hintstyle;
+  cairo_hint_metrics_t hintmetrics;
+  int i;
+
+  if (!context)
+    context = gtk_widget_create_pango_context (image);
+
+  text = gtk_editable_get_text (GTK_EDITABLE (entry));
+  desc = gtk_font_chooser_get_font_desc (GTK_FONT_CHOOSER (font_button));
+
+  fopt = cairo_font_options_copy (pango_cairo_context_get_font_options (context));
+
+  hint = gtk_combo_box_get_active_id (GTK_COMBO_BOX (hinting));
+  if (strcmp (hint, "none") == 0)
+    hintstyle = CAIRO_HINT_STYLE_NONE;
+  else if (strcmp (hint, "slight") == 0)
+    hintstyle = CAIRO_HINT_STYLE_SLIGHT;
+  else if (strcmp (hint, "medium") == 0)
+    hintstyle = CAIRO_HINT_STYLE_MEDIUM;
+  else if (strcmp (hint, "full") == 0)
+    hintstyle = CAIRO_HINT_STYLE_FULL;
+  else
+    hintstyle = CAIRO_HINT_STYLE_DEFAULT;
+  cairo_font_options_set_hint_style (fopt, hintstyle);
+
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (hint_metrics)))
+    hintmetrics = CAIRO_HINT_METRICS_ON;
+  else
+    hintmetrics = CAIRO_HINT_METRICS_OFF;
+  cairo_font_options_set_hint_metrics (fopt, hintmetrics);
+
+  pango_cairo_context_set_font_options (context, fopt);
+  cairo_font_options_destroy (fopt);
+  pango_context_changed (context);
+
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (text_radio)))
+    {
+      layout = pango_layout_new (context);
+      pango_layout_set_font_description (layout, desc);
+      pango_layout_set_text (layout, text, -1);
+      pango_layout_get_extents (layout, &ink, &logical);
+      pink = ink;
+      baseline = pango_layout_get_baseline (layout);
+
+      pango_extents_to_pixels (&ink, NULL);
+
+      surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, ink.width + 20, ink.height + 20);
+      cr = cairo_create (surface);
+      cairo_set_source_rgb (cr, 1, 1, 1);
+      cairo_paint (cr);
+
+      cairo_set_source_rgb (cr, 0, 0, 0);
+      cairo_move_to (cr, 10, 10);
+      pango_cairo_show_layout (cr, layout);
+
+      cairo_destroy (cr);
+      g_object_unref (layout);
+
+      pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, cairo_image_surface_get_width (surface), cairo_image_surface_get_height (surface));
+      pixbuf2 = gdk_pixbuf_scale_simple (pixbuf, gdk_pixbuf_get_width (pixbuf) * scale, gdk_pixbuf_get_height (pixbuf) * scale, GDK_INTERP_NEAREST);
+
+      g_object_unref (pixbuf);
+      cairo_surface_destroy (surface);
+
+      surface = cairo_image_surface_create_for_data (gdk_pixbuf_get_pixels (pixbuf2),
+                                                     CAIRO_FORMAT_ARGB32,
+                                                     gdk_pixbuf_get_width (pixbuf2),
+                                                     gdk_pixbuf_get_height (pixbuf2),
+                                                     gdk_pixbuf_get_rowstride (pixbuf2));
+
+      cr = cairo_create (surface);
+      cairo_set_line_width (cr, 1);
+
+      if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (show_grid)))
+        {
+          cairo_set_source_rgba (cr, 0.2, 0, 0, 0.2);
+          for (i = 1; i < ink.height + 20; i++)
+            {
+              cairo_move_to (cr, 0, scale * i - 0.5);
+              cairo_line_to (cr, scale * (ink.width + 20), scale * i - 0.5);
+              cairo_stroke (cr);
+            }
+          for (i = 1; i < ink.width + 20; i++)
+            {
+              cairo_move_to (cr, scale * i - 0.5, 0);
+              cairo_line_to (cr, scale * i - 0.5, scale * (ink.height + 20));
+              cairo_stroke (cr);
+            }
+        }
+
+      if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (show_extents)))
+        {
+          cairo_set_source_rgba (cr, 0, 0, 1, 1);
+
+          cairo_rectangle (cr,
+                           scale * (10 + pango_units_to_double (logical.x)) - 0.5,
+                           scale * (10 + pango_units_to_double (logical.y)) - 0.5,
+                           scale * pango_units_to_double (logical.width) + 1,
+                           scale * pango_units_to_double (logical.height) + 1);
+          cairo_stroke (cr);
+          cairo_move_to (cr, scale * (10 + pango_units_to_double (logical.x)) - 0.5,
+                             scale * (10 + pango_units_to_double (baseline)) - 0.5);
+          cairo_line_to (cr, scale * (10 + pango_units_to_double (logical.x + logical.width)) + 1,
+                             scale * (10 + pango_units_to_double (baseline)) - 0.5);
+          cairo_stroke (cr);
+          cairo_set_source_rgba (cr, 1, 0, 0, 1);
+          cairo_rectangle (cr,
+                           scale * (10 + pango_units_to_double (pink.x)) + 0.5,
+                           scale * (10 + pango_units_to_double (pink.y)) + 0.5,
+                           scale * pango_units_to_double (pink.width) - 1,
+                           scale * pango_units_to_double (pink.height) - 1);
+          cairo_stroke (cr);
+        }
+
+      cairo_surface_destroy (surface);
+      cairo_destroy (cr);
+    }
+  else
+    {
+      PangoLayoutIter *iter;
+      PangoLayoutRun *run;
+      PangoGlyphInfo *g;
+      int i, j;
+
+      layout = pango_layout_new (context);
+      pango_layout_set_font_description (layout, desc);
+      pango_layout_set_text (layout, "aaaa", -1);
+      pango_layout_get_extents (layout, &ink, &logical);
+      pango_extents_to_pixels (&logical, NULL);
+
+      surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, logical.width * 3 / 2, 4*logical.height);
+      cr = cairo_create (surface);
+      cairo_set_source_rgb (cr, 1, 1, 1);
+      cairo_paint (cr);
+
+      iter = pango_layout_get_iter (layout);
+      run = pango_layout_iter_get_run (iter);
+
+      cairo_set_source_rgb (cr, 0, 0, 0);
+      for (i = 0; i < 4; i++)
+        {
+          g = &(run->glyphs->glyphs[i]);
+          g->geometry.width = PANGO_UNITS_ROUND (g->geometry.width * 3 / 2);
+        }
+
+      for (j = 0; j < 4; j++)
+        {
+          for (i = 0; i < 4; i++)
+            {
+              g = &(run->glyphs->glyphs[i]);
+              g->geometry.x_offset = i * (PANGO_SCALE / 4);
+              g->geometry.y_offset = j * (PANGO_SCALE / 4);
+            }
+
+          cairo_move_to (cr, 0, j * logical.height);
+          pango_cairo_show_layout (cr, layout);
+        }
+
+      cairo_destroy (cr);
+      pango_layout_iter_free (iter);
+      g_object_unref (layout);
+
+      pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, cairo_image_surface_get_width (surface), cairo_image_surface_get_height (surface));
+      pixbuf2 = gdk_pixbuf_scale_simple (pixbuf, gdk_pixbuf_get_width (pixbuf) * scale, gdk_pixbuf_get_height (pixbuf) * scale, GDK_INTERP_NEAREST);
+      g_object_unref (pixbuf);
+      cairo_surface_destroy (surface);
+    }
+
+
+  gtk_picture_set_pixbuf (GTK_PICTURE (image), pixbuf2);
+
+  g_object_unref (pixbuf2);
+
+  pango_font_description_free (desc);
+}
+
+static void
+update_buttons (void)
+{
+  gtk_widget_set_sensitive (up_button, scale < 32);
+  gtk_widget_set_sensitive (down_button, scale > 1);
+}
+
+static void
+scale_up (void)
+{
+  scale += 1;
+  update_buttons ();
+  update_image ();
+}
+
+static void
+scale_down (void)
+{
+  scale -= 1;
+  update_buttons ();
+  update_image ();
+}
+
+GtkWidget *
+do_fontrendering (GtkWidget *do_widget)
+{
+  if (!window)
+    {
+      GtkBuilder *builder;
+
+      builder = gtk_builder_new_from_resource ("/fontrendering/fontrendering.ui");
+      gtk_builder_connect_signals (builder, NULL);
+      window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
+      gtk_window_set_display (GTK_WINDOW (window),
+                              gtk_widget_get_display (do_widget));
+      g_signal_connect (window, "destroy",
+                        G_CALLBACK (on_destroy), NULL);
+      g_object_set_data_full (G_OBJECT (window), "builder", builder, g_object_unref);
+      font_button = GTK_WIDGET (gtk_builder_get_object (builder, "font_button"));
+      up_button = GTK_WIDGET (gtk_builder_get_object (builder, "up_button"));
+      down_button = GTK_WIDGET (gtk_builder_get_object (builder, "down_button"));
+      entry = GTK_WIDGET (gtk_builder_get_object (builder, "entry"));
+      image = GTK_WIDGET (gtk_builder_get_object (builder, "image"));
+      hinting = GTK_WIDGET (gtk_builder_get_object (builder, "hinting"));
+      hint_metrics = GTK_WIDGET (gtk_builder_get_object (builder, "hint_metrics"));
+      text_radio = GTK_WIDGET (gtk_builder_get_object (builder, "text_radio"));
+      show_grid = GTK_WIDGET (gtk_builder_get_object (builder, "show_grid"));
+      show_extents = GTK_WIDGET (gtk_builder_get_object (builder, "show_extents"));
+
+      g_signal_connect (up_button, "clicked", G_CALLBACK (scale_up), NULL);
+      g_signal_connect (down_button, "clicked", G_CALLBACK (scale_down), NULL);
+      g_signal_connect (entry, "notify::text", G_CALLBACK (update_image), NULL);
+      g_signal_connect (font_button, "notify::font-desc", G_CALLBACK (update_image), NULL);
+      g_signal_connect (hinting, "notify::active", G_CALLBACK (update_image), NULL);
+      g_signal_connect (hint_metrics, "notify::active", G_CALLBACK (update_image), NULL);
+      g_signal_connect (text_radio, "notify::active", G_CALLBACK (update_image), NULL);
+      g_signal_connect (show_grid, "notify::active", G_CALLBACK (update_image), NULL);
+      g_signal_connect (show_extents, "notify::active", G_CALLBACK (update_image), NULL);
+
+      update_image ();
+    }
+
+  if (!gtk_widget_get_visible (window))
+    gtk_widget_show (window);
+  else
+    gtk_widget_destroy (window);
+
+  return window;
+}

demos/gtk-demo/fontrendering.ui

@@ -0,0 +1,215 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <object class="GtkAdjustment" id="scale_adj">
+    <property name="upper">24</property>
+    <property name="step-increment">1</property>
+    <property name="page-increment">4</property>
+  </object>
+  <object class="GtkWindow" id="window">
+    <property name="default-width">600</property>
+    <property name="default-height">300</property>
+    <property name="title">Font rendering</property>
+    <child>
+      <object class="GtkGrid">
+        <property name="margin-top">10</property>
+        <property name="row-spacing">10</property>
+        <property name="column-spacing">10</property>
+        <child>
+          <object class="GtkLabel">
+            <property name="margin-start">10</property>
+            <property name="label">Text</property>
+            <property name="xalign">1</property>
+            <style>
+              <class name="dim-label"/>
+            </style>
+          </object>
+        </child>
+        <child>
+          <object class="GtkEntry" id="entry">
+            <property name="text">Fonts render</property>
+            <layout>
+              <property name="left-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="margin-start">10</property>
+            <property name="label">Font</property>
+            <property name="xalign">1</property>
+            <style>
+              <class name="dim-label"/>
+            </style>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkFontButton" id="font_button">
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="label">Hinting</property>
+            <property name="xalign">1</property>
+            <style>
+              <class name="dim-label"/>
+            </style>
+            <layout>
+              <property name="left-attach">2</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkComboBoxText" id="hinting">
+            <property name="active">0</property>
+            <property name="valign">center</property>
+            <items>
+              <item translatable="yes" id="none">None</item>
+              <item translatable="yes" id="slight">Slight</item>
+              <item translatable="yes" id="medium">Medium</item>
+              <item translatable="yes" id="full">Full</item>
+            </items>
+            <layout>
+              <property name="left-attach">3</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkCheckButton" id="hint_metrics">
+            <child>
+              <object class="GtkLabel">
+                <property name="label">Hint Metrics</property>
+                <style>
+                  <class name="dim-label"/>
+                </style>
+              </object>
+            </child>
+            <layout>
+              <property name="left-attach">3</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkCheckButton" id="show_extents">
+            <property name="active">1</property>
+            <child>
+              <object class="GtkLabel">
+                <property name="label">Show Extents</property>
+                <style>
+                  <class name="dim-label"/>
+                </style>
+              </object>
+            </child>
+            <layout>
+              <property name="left-attach">4</property>
+              <property name="top-attach">0</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkCheckButton" id="show_grid">
+            <property name="active">1</property>
+            <child>
+              <object class="GtkLabel">
+                <property name="label">Show Grid</property>
+                <style>
+                  <class name="dim-label"/>
+                </style>
+              </object>
+            </child>
+            <layout>
+              <property name="left-attach">4</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkButton" id="up_button">
+            <property name="icon-name">list-add-symbolic</property>
+            <style>
+              <class name="circular"/>
+            </style>
+            <layout>
+              <property name="left-attach">5</property>
+              <property name="top-attach">0</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkButton" id="down_button">
+            <property name="icon-name">list-remove-symbolic</property>
+            <style>
+              <class name="circular"/>
+            </style>
+            <layout>
+              <property name="left-attach">5</property>
+              <property name="top-attach">1</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="hexpand">1</property>
+            <layout>
+              <property name="left-attach">6</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkBox">
+            <property name="orientation">horizontal</property>
+            <property name="halign">center</property>
+            <property name="valign">center</property>
+            <style><class name="linked"/></style>
+            <child>
+              <object class="GtkRadioButton" id="text_radio">
+                <property name="draw-indicator">0</property>
+                <property name="label">Text</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkRadioButton" id="grid_radio">
+                <property name="draw-indicator">0</property>
+                <property name="label">Grid</property>
+                <property name="group">text_radio</property>
+              </object>
+            </child>
+            <layout>
+             <property name="left-attach">0</property>
+              <property name="top-attach">3</property>
+              <property name="column-span">7</property>
+            </layout>
+          </object>
+        </child>
+        <child>
+          <object class="GtkScrolledWindow">
+            <property name="propagate-natural-height">1</property>
+            <property name="shadow-type">in</property>
+            <property name="hexpand">1</property>
+            <property name="vexpand">1</property>
+            <child>
+              <object class="GtkPicture" id="image">
+                <property name="halign">center</property>
+                <property name="valign">center</property>
+                <property name="can-shrink">0</property>
+              </object>
+            </child>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">4</property>
+              <property name="column-span">7</property>
+            </layout>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>

demos/gtk-demo/gtkfishbowl.c

@@ -53,6 +53,7 @@ enum {
    PROP_BENCHMARK,
    PROP_COUNT,
    PROP_FRAMERATE,
+   PROP_FRAMERATE_STRING,
    PROP_UPDATE_DELAY,
    NUM_PROPERTIES
 };
@@ -66,8 +67,6 @@ gtk_fishbowl_init (GtkFishbowl *fishbowl)
 {
   GtkFishbowlPrivate *priv = gtk_fishbowl_get_instance_private (fishbowl);
 
-  gtk_widget_set_has_surface (GTK_WIDGET (fishbowl), FALSE);
-
   priv->update_delay = G_USEC_PER_SEC;
 }
 
@@ -290,6 +289,14 @@ gtk_fishbowl_get_property (GObject         *object,
       g_value_set_double (value, gtk_fishbowl_get_framerate (fishbowl));
       break;
 
+    case PROP_FRAMERATE_STRING:
+      {
+        char *s = g_strdup_printf ("%.2f", gtk_fishbowl_get_framerate (fishbowl));
+        g_value_set_string (value, s);
+        g_free (s);
+      }
+      break;
+
     case PROP_UPDATE_DELAY:
       g_value_set_int64 (value, gtk_fishbowl_get_update_delay (fishbowl));
       break;
@@ -343,6 +350,13 @@ gtk_fishbowl_class_init (GtkFishbowlClass *klass)
                            0,
                            G_PARAM_READABLE);
 
+  props[PROP_FRAMERATE_STRING] =
+      g_param_spec_string ("framerate-string",
+                           "Framerate as string",
+                           "Framerate as string, with 2 decimals",
+                           NULL,
+                           G_PARAM_READABLE);
+
   props[PROP_UPDATE_DELAY] =
       g_param_spec_int64 ("update-delay",
                           "Update delay",
@@ -491,7 +505,10 @@ gtk_fishbowl_do_update (GtkFishbowl *fishbowl)
 
   n_frames = end_counter - start_counter;
   priv->framerate = ((double) n_frames) * G_USEC_PER_SEC / (end_timestamp - start_timestamp);
+  priv->framerate = ((int)(priv->framerate * 100))/100.0;
+
   g_object_notify_by_pspec (G_OBJECT (fishbowl), props[PROP_FRAMERATE]);
+  g_object_notify_by_pspec (G_OBJECT (fishbowl), props[PROP_FRAMERATE_STRING]);
 
   if (!priv->benchmark)
     return;

demos/gtk-demo/hypertext.c

@@ -136,11 +136,11 @@ static void set_cursor_if_appropriate (GtkTextView *text_view,
                                        gint         y);
 
 static void
-released_cb (GtkGestureMultiPress *gesture,
-             guint                 n_press,
-             gdouble               x,
-             gdouble               y,
-             GtkWidget            *text_view)
+released_cb (GtkGestureClick *gesture,
+             guint            n_press,
+             gdouble          x,
+             gdouble          y,
+             GtkWidget       *text_view)
 {
   GtkTextIter start, end, iter;
   GtkTextBuffer *buffer;
@@ -247,7 +247,7 @@ do_hypertext (GtkWidget *do_widget)
       g_signal_connect (controller, "key-pressed", G_CALLBACK (key_pressed), view);
       gtk_widget_add_controller (view, controller);
 
-      controller = GTK_EVENT_CONTROLLER (gtk_gesture_multi_press_new ());
+      controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
       g_signal_connect (controller, "released",
                         G_CALLBACK (released_cb), view);
       gtk_widget_add_controller (view, controller);

demos/gtk-demo/infobar.c

@@ -20,7 +20,7 @@ on_bar_response (GtkInfoBar *info_bar,
       return;
     }
 
-  window = gtk_widget_get_toplevel (GTK_WIDGET (info_bar));
+  window = GTK_WIDGET (gtk_widget_get_root (GTK_WIDGET (info_bar)));
   dialog = gtk_message_dialog_new (GTK_WINDOW (window),
                                    GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
                                    GTK_MESSAGE_INFO,

demos/gtk-demo/language-names.c

@@ -202,7 +202,7 @@ languages_variant_init (const char *variant)
   else
     g_warning ("Failed to load '%s': %s\n", filename, error->message);
 
-  g_free (error);
+  g_clear_error (&error);
   g_free (filename);
   g_free (buf);
 }

demos/gtk-demo/links.c

@@ -25,7 +25,7 @@ activate_link (GtkWidget   *label,
       GtkWidget *dialog;
       GtkWidget *parent;
 
-      parent = gtk_widget_get_toplevel (label);
+      parent = GTK_WIDGET (gtk_widget_get_root (label));
       dialog = gtk_message_dialog_new_with_markup (GTK_WINDOW (parent),
                  GTK_DIALOG_DESTROY_WITH_PARENT,
                  GTK_MESSAGE_INFO,

demos/gtk-demo/listbox.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface domain="gtk40">
   <object class="GtkMenu" id="menu1">
     <child>
@@ -28,12 +29,12 @@
             <property name="margin-start">8</property>
             <property name="margin-end">8</property>
             <property name="icon-name">image-missing</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">0</property>
+              <property name="row-span">5</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">0</property>
-            <property name="height">5</property>
-          </packing>
         </child>
         <child>
           <object class="GtkBox" id="box1">
@@ -74,11 +75,11 @@
                 </style>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkLabel" id="content_label">
@@ -91,11 +92,11 @@
             <accessibility>
               <role type="static"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
         <child>
           <object class="GtkBox" id="resent_box">
@@ -118,11 +119,11 @@
                 <property name="uri">http://www.gtk.org</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
         <child>
           <object class="GtkBox" id="box3">
@@ -170,22 +171,18 @@
                   <object class="GtkMenuButton" id="more-button">
                     <property name="can-focus">1</property>
                     <property name="receives-default">1</property>
-                    <property name="relief">none</property>
                     <property name="popup">menu1</property>
-                    <child>
-                      <object class="GtkLabel" id="label7">
-                        <property name="label" translatable="yes">More...</property>
-                      </object>
-                    </child>
+                    <property name="relief">none</property>
+                    <property name="label" translatable="yes">More...</property>
                   </object>
                 </child>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">3</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">3</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="details_revealer">
@@ -250,11 +247,11 @@ FAVORITES</property>
                 </child>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">4</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">4</property>
-          </packing>
         </child>
       </object>
     </child>

demos/gtk-demo/main.c

@@ -45,22 +45,43 @@ activate_about (GSimpleAction *action,
     "The GTK Team",
     NULL
   };
+  char *version;
+  GString *s;
+
+  s = g_string_new ("");
+
+  g_string_append (s, "System libraries\n");
+  g_string_append_printf (s, "\tGLib\t%d.%d.%d\n",
+                          glib_major_version,
+                          glib_minor_version,
+                          glib_micro_version);
+  g_string_append_printf (s, "\tGTK\t%d.%d.%d\n",
+                          gtk_get_major_version (),
+                          gtk_get_minor_version (),
+                          gtk_get_micro_version ());
+  g_string_append_printf (s, "\nA link can apppear here: <http://www.gtk.org>");
+
+  version = g_strdup_printf ("%s\nRunning against GTK %d.%d.%d",
+                             PACKAGE_VERSION,
+                             gtk_get_major_version (),
+                             gtk_get_minor_version (),
+                             gtk_get_micro_version ());
 
   gtk_show_about_dialog (GTK_WINDOW (gtk_application_get_active_window (app)),
                          "program-name", "GTK Demo",
-                         "version", g_strdup_printf ("%s,\nRunning against GTK %d.%d.%d",
-                                                     PACKAGE_VERSION,
-                                                     gtk_get_major_version (),
-                                                     gtk_get_minor_version (),
-                                                     gtk_get_micro_version ()),
-                         "copyright", "(C) 1997-2013 The GTK Team",
+                         "version", version,
+                         "copyright", "© 1997—2019 The GTK Team",
                          "license-type", GTK_LICENSE_LGPL_2_1,
                          "website", "http://www.gtk.org",
                          "comments", "Program to demonstrate GTK widgets",
                          "authors", authors,
-                         "logo-icon-name", "org.gtk.Demo",
+                         "logo-icon-name", "org.gtk.Demo4",
                          "title", "About GTK Demo",
+                         "system-information", s->str,
                          NULL);
+
+  g_string_free (s, TRUE);
+  g_free (version);
 }
 
 static void
@@ -84,6 +105,14 @@ activate_quit (GSimpleAction *action,
     }
 }
 
+static void
+activate_inspector (GSimpleAction *action,
+                    GVariant      *parameter,
+                    gpointer       user_data)
+{
+  gtk_window_set_interactive_debugging (TRUE);
+}
+
 static void
 window_closed_cb (GtkWidget *window, gpointer data)
 {
@@ -135,7 +164,7 @@ run_example_for_row (GtkWidget    *window,
           cbdata->model = model;
           cbdata->path = gtk_tree_model_get_path (model, iter);
 
-          if (gtk_widget_is_toplevel (demo))
+          if (GTK_IS_WINDOW (demo))
             {
               gtk_window_set_transient_for (GTK_WINDOW (demo), GTK_WINDOW (window));
               gtk_window_set_modal (GTK_WINDOW (demo), TRUE);
@@ -668,7 +697,7 @@ add_data_tab (const gchar *demoname)
       gtk_widget_show (label);
       gtk_notebook_append_page (GTK_NOTEBOOK (notebook), widget, label);
       g_object_set (gtk_notebook_get_page (GTK_NOTEBOOK (notebook), widget),
-                    "tab-expand", TRUE,
+                    "tab-expand", FALSE,
                     NULL);
 
       g_free (resource_name);
@@ -962,7 +991,7 @@ row_activated_cb (GtkWidget         *tree_view,
   GtkWidget *window;
   GtkTreeModel *model;
 
-  window = gtk_widget_get_toplevel (tree_view);
+  window = GTK_WIDGET (gtk_widget_get_root (tree_view));
   model = gtk_tree_view_get_model (GTK_TREE_VIEW (tree_view));
   gtk_tree_model_get_iter (model, &iter, path);
 
@@ -1200,6 +1229,7 @@ main (int argc, char **argv)
   static GActionEntry app_entries[] = {
     { "about", activate_about, NULL, NULL, NULL },
     { "quit", activate_quit, NULL, NULL, NULL },
+    { "inspector", activate_inspector, NULL, NULL, NULL },
   };
 
   /* Most code in gtk-demo is intended to be exemplary, but not
@@ -1212,7 +1242,7 @@ main (int argc, char **argv)
     }
   /* -- End of hack -- */
 
-  app = gtk_application_new ("org.gtk.Demo", G_APPLICATION_NON_UNIQUE|G_APPLICATION_HANDLES_COMMAND_LINE);
+  app = gtk_application_new ("org.gtk.Demo4", G_APPLICATION_NON_UNIQUE|G_APPLICATION_HANDLES_COMMAND_LINE);
 
   g_action_map_add_action_entries (G_ACTION_MAP (app),
                                    app_entries, G_N_ELEMENTS (app_entries),

demos/gtk-demo/main.ui

@@ -1,4 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
+  <menu id="gear_menu">
+    <section>
+      <item>
+        <attribute name="label" translatable="yes">_Inspector</attribute>
+        <attribute name="action">app.inspector</attribute>
+      </item>
+      <item>
+        <attribute name="label" translatable="yes">_About GTK Demo</attribute>
+        <attribute name="action">app.about</attribute>
+      </item>
+    </section>
+  </menu>
   <object class="GtkTreeStore" id="treestore">
     <columns>
       <column type="gchararray"/>
@@ -34,6 +47,13 @@
             </child>
           </object>
         </child>
+        <child type="end">
+          <object class="GtkMenuButton" id="gear_menu_button">
+            <property name="valign">center</property>
+            <property name="menu-model">gear_menu</property>
+            <property name="icon-name">open-menu-symbolic</property>
+          </object>
+        </child>
       </object>
     </child>
     <child>

demos/gtk-demo/menus.c

@@ -70,12 +70,6 @@ change_orientation (GtkWidget *button,
   parent = gtk_widget_get_parent (menubar);
   orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (parent));
   gtk_orientable_set_orientation (GTK_ORIENTABLE (parent), 1 - orientation);
-
-  if (orientation == GTK_ORIENTATION_VERTICAL)
-    g_object_set (menubar, "pack-direction", GTK_PACK_DIRECTION_TTB, NULL);
-  else
-    g_object_set (menubar, "pack-direction", GTK_PACK_DIRECTION_LTR, NULL);
-
 }
 
 static GtkWidget *window = NULL;
@@ -107,51 +101,41 @@ do_menus (GtkWidget *do_widget)
 
       box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
       gtk_container_add (GTK_CONTAINER (window), box);
-      gtk_widget_show (box);
 
       box1 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
       gtk_container_add (GTK_CONTAINER (box), box1);
-      gtk_widget_show (box1);
 
       menubar = gtk_menu_bar_new ();
       gtk_widget_set_hexpand (menubar, TRUE);
       gtk_container_add (GTK_CONTAINER (box1), menubar);
-      gtk_widget_show (menubar);
 
       menu = create_menu (2);
 
       menuitem = gtk_menu_item_new_with_label ("test\nline2");
       gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), menu);
       gtk_menu_shell_append (GTK_MENU_SHELL (menubar), menuitem);
-      gtk_widget_show (menuitem);
 
       menuitem = gtk_menu_item_new_with_label ("foo");
       gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), create_menu (3));
       gtk_menu_shell_append (GTK_MENU_SHELL (menubar), menuitem);
-      gtk_widget_show (menuitem);
 
       menuitem = gtk_menu_item_new_with_label ("bar");
       gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), create_menu (4));
       gtk_menu_shell_append (GTK_MENU_SHELL (menubar), menuitem);
-      gtk_widget_show (menuitem);
 
       box2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
       gtk_container_add (GTK_CONTAINER (box1), box2);
-      gtk_widget_show (box2);
 
       button = gtk_button_new_with_label ("Flip");
       g_signal_connect (button, "clicked",
                         G_CALLBACK (change_orientation), menubar);
       gtk_container_add (GTK_CONTAINER (box2), button);
-      gtk_widget_show (button);
 
       button = gtk_button_new_with_label ("Close");
       g_signal_connect_swapped (button, "clicked",
                                 G_CALLBACK(gtk_widget_destroy), window);
       gtk_container_add (GTK_CONTAINER (box2), button);
-      gtk_widget_set_can_default (button, TRUE);
-      gtk_widget_grab_default (button);
-      gtk_widget_show (button);
+      gtk_window_set_default_widget (GTK_WINDOW (window), button);
     }
 
   if (!gtk_widget_get_visible (window))

demos/gtk-demo/menus.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <menu id="appmenu">
     <section>

demos/gtk-demo/meson.build

@@ -8,6 +8,9 @@ demos = files([
   'clipboard.c',
   'colorsel.c',
   'combobox.c',
+  'constraints.c',
+  'constraints2.c',
+  'constraints3.c',
   'css_accordion.c',
   'css_basics.c',
   'css_blendmodes.c',
@@ -24,6 +27,8 @@ demos = files([
   'expander.c',
   'filtermodel.c',
   'fishbowl.c',
+  'fixed.c',
+  'fontrendering.c',
   'foreigndrawing.c',
   'gestures.c',
   'glarea.c',
@@ -65,9 +70,11 @@ demos = files([
   'spinner.c',
   'stack.c',
   'tabs.c',
+  'tagged_entry.c',
   'textmask.c',
   'textview.c',
   'textscroll.c',
+  'themes.c',
   'theming_style_classes.c',
   'transparent.c',
   'tree_store.c',
@@ -76,7 +83,13 @@ demos = files([
 
 gtkdemo_deps = [ libgtk_dep, ]
 
-extra_demo_sources = files(['main.c', 'gtkfishbowl.c', 'fontplane.c', 'gtkgears.c', 'puzzlepiece.c', 'bluroverlay.c'])
+extra_demo_sources = files(['main.c',
+                            'gtkfishbowl.c',
+                            'fontplane.c',
+                            'gtkgears.c',
+                            'puzzlepiece.c',
+                            'bluroverlay.c',
+                            'demotaggedentry.c'])
 
 if harfbuzz_dep.found() and pangoft_dep.found()
   demos += files('font_features.c')
@@ -127,11 +140,11 @@ foreach size: ['scalable', 'symbolic']
 endforeach
 
 # desktop file
-install_data('org.gtk.Demo.desktop', install_dir: gtk_applicationsdir)
+install_data('org.gtk.Demo4.desktop', install_dir: gtk_applicationsdir)
 
 # GSettings
-install_data('org.gtk.Demo.gschema.xml', install_dir: gtk_schemasdir)
+install_data('org.gtk.Demo4.gschema.xml', install_dir: gtk_schemasdir)
 gnome.compile_schemas()
 
 # appdata
-install_data('org.gtk.Demo.appdata.xml', install_dir: gtk_appdatadir)
+install_data('org.gtk.Demo4.appdata.xml', install_dir: gtk_appdatadir)

demos/gtk-demo/modelbutton.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkWindow" id="window1">
     <child type="titlebar">

demos/gtk-demo/org.gtk.Demo4.appdata.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.Demo.desktop</id>
+  <id>org.gtk.Demo4.desktop</id>
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>LGPL-2.0+</project_license>
   <name>GTK Demo</name>
@@ -30,4 +30,11 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <releases>
+    <release version="3.94.0" date="2018-06-25">
+      <description>
+        <p>A new developers snapshot towards GTK 4.0.</p>
+      </description>
+    </release>
+  </releases>
 </component>

demos/gtk-demo/org.gtk.Demo4.desktop

@@ -2,7 +2,7 @@
 Name=GTK Demo
 Comment=GTK code examples and demonstrations
 Exec=gtk4-demo
-Icon=org.gtk.Demo
+Icon=org.gtk.Demo4
 Terminal=false
 Type=Application
 StartupNotify=true

demos/gtk-demo/org.gtk.Demo4.gschema.xml

@@ -2,14 +2,14 @@
 
 <schemalist>
 
-  <enum id='org.gtk.Demo.Color'>
+  <enum id='org.gtk.Demo4.Color'>
     <value nick='red'   value='0'/>
     <value nick='green' value='1'/>
     <value nick='blue'  value='2'/>
   </enum>
 
-  <schema id='org.gtk.Demo' path='/org/gtk/Demo/'>
-    <key name='color' enum='org.gtk.Demo.Color'>
+  <schema id='org.gtk.Demo4' path='/org/gtk/Demo4/'>
+    <key name='color' enum='org.gtk.Demo4.Color'>
       <default>'red'</default>
     </key>
     <key name='window-size' type='(ii)'>

demos/gtk-demo/overlay.c

@@ -57,7 +57,7 @@ do_overlay (GtkWidget *do_widget)
 
       vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
       gtk_overlay_add_overlay (GTK_OVERLAY (overlay), vbox);
-      gtk_widget_set_can_pick (vbox, FALSE);
+      gtk_widget_set_can_target (vbox, FALSE);
       gtk_widget_set_halign (vbox, GTK_ALIGN_CENTER);
       gtk_widget_set_valign (vbox, GTK_ALIGN_CENTER);
 

demos/gtk-demo/overlay2.c

@@ -66,13 +66,13 @@ do_overlay2 (GtkWidget *do_widget)
 
       image = gtk_picture_new_for_resource ("/overlay2/decor1.png");
       gtk_overlay_add_overlay (GTK_OVERLAY (overlay), image);
-      gtk_widget_set_can_pick (image, FALSE);
+      gtk_widget_set_can_target (image, FALSE);
       gtk_widget_set_halign (image, GTK_ALIGN_START);
       gtk_widget_set_valign (image, GTK_ALIGN_START);
 
       image = gtk_picture_new_for_resource ("/overlay2/decor2.png");
       gtk_overlay_add_overlay (GTK_OVERLAY (overlay), image);
-      gtk_widget_set_can_pick (image, FALSE);
+      gtk_widget_set_can_target (image, FALSE);
       gtk_widget_set_halign (image, GTK_ALIGN_END);
       gtk_widget_set_valign (image, GTK_ALIGN_END);
 

demos/gtk-demo/paint.c

@@ -176,7 +176,7 @@ drawing_area_unroot (GtkWidget *widget)
   DrawingArea *area = (DrawingArea *) widget;
   GtkWidget *toplevel;
 
-  toplevel = gtk_widget_get_toplevel (widget);
+  toplevel = GTK_WIDGET (gtk_widget_get_root (widget));
 
   if (area->pad_controller)
     {
@@ -198,7 +198,7 @@ drawing_area_root (GtkWidget *widget)
 
   GTK_WIDGET_CLASS (drawing_area_parent_class)->root (widget);
 
-  toplevel = gtk_widget_get_toplevel (GTK_WIDGET (area));
+  toplevel = GTK_WIDGET (gtk_widget_get_root (GTK_WIDGET (area)));
 
   action_group = g_simple_action_group_new ();
   area->pad_controller = gtk_pad_controller_new (G_ACTION_GROUP (action_group), NULL);
@@ -330,8 +330,6 @@ drawing_area_init (DrawingArea *area)
 {
   GtkGesture *gesture;
 
-  gtk_widget_set_has_surface (GTK_WIDGET (area), FALSE);
-
   gesture = gtk_gesture_stylus_new ();
   g_signal_connect (gesture, "down",
                     G_CALLBACK (stylus_gesture_down), area);

demos/gtk-demo/panes.c

@@ -27,10 +27,16 @@ toggle_resize (GtkWidget *widget,
 
   is_child1 = (child == gtk_paned_get_child1 (paned));
 
-  gtk_container_child_get (GTK_CONTAINER (paned), child,
-                           "resize", &resize,
-                           "shrink", &shrink,
-                           NULL);
+  if (is_child1)
+    g_object_get (paned,
+                  "resize-child1", &resize,
+                  "shrink-child1", &shrink,
+                  NULL);
+  else
+    g_object_get (paned,
+                  "resize-child2", &resize,
+                  "shrink-child2", &shrink,
+                  NULL);
 
   g_object_ref (child);
   gtk_container_remove (GTK_CONTAINER (parent), child);
@@ -55,10 +61,16 @@ toggle_shrink (GtkWidget *widget,
 
   is_child1 = (child == gtk_paned_get_child1 (paned));
 
-  gtk_container_child_get (GTK_CONTAINER (paned), child,
-                           "resize", &resize,
-                           "shrink", &shrink,
-                           NULL);
+  if (is_child1)
+    g_object_get (paned,
+                  "resize-child1", &resize,
+                  "shrink-child1", &shrink,
+                  NULL);
+  else
+    g_object_get (paned,
+                  "resize-child2", &resize,
+                  "shrink-child2", &shrink,
+                  NULL);
 
   g_object_ref (child);
   gtk_container_remove (GTK_CONTAINER (parent), child);

demos/gtk-demo/password_entry.c

@@ -76,8 +76,7 @@ do_password_entry (GtkWidget *do_widget)
       gtk_widget_set_sensitive (button, FALSE);
       gtk_header_bar_pack_end (GTK_HEADER_BAR (header), button);
 
-      gtk_widget_set_can_default (button, TRUE);
-      gtk_window_set_default (GTK_WINDOW (window), button);
+      gtk_window_set_default_widget (GTK_WINDOW (window), button);
     }
 
   if (!gtk_widget_get_visible (window))

demos/gtk-demo/popover.c

@@ -143,7 +143,7 @@ do_popover (GtkWidget *do_widget)
       popover = create_popover (widget,
                                 gtk_label_new ("This popover does not grab input"),
                                 GTK_POS_TOP);
-      gtk_popover_set_modal (GTK_POPOVER (popover), FALSE);
+      gtk_popover_set_autohide (GTK_POPOVER (popover), FALSE);
       g_signal_connect (widget, "toggled",
                         G_CALLBACK (toggle_changed_cb), popover);
       gtk_container_add (GTK_CONTAINER (box), widget);

demos/gtk-demo/popover.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkListStore" id="liststore1">
     <columns>

demos/gtk-demo/revealer.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkWindow" id="window">
     <property name="default-width">300</property>
@@ -17,11 +18,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">2</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="revealer1">
@@ -33,11 +34,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">2</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="revealer2">
@@ -49,11 +50,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">3</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">3</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="revealer3">
@@ -64,11 +65,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">3</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">2</property>
-            <property name="top-attach">3</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="revealer4">
@@ -80,11 +81,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="revealer5">
@@ -96,11 +97,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">2</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="revealer6">
@@ -112,11 +113,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">4</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">4</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="revealer7">
@@ -127,11 +128,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">2</property>
+              <property name="top-attach">4</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">2</property>
-            <property name="top-attach">4</property>
-          </packing>
         </child>
         <child>
           <object class="GtkRevealer" id="revealer8">
@@ -143,11 +144,11 @@
                 <property name="icon-size">large</property>
               </object>
             </child>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
       </object>
     </child>

demos/gtk-demo/scale.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkAdjustment" id="adjustment1">
     <property name="upper">4</property>
@@ -31,11 +32,11 @@
             <accessibility>
               <relation type="label-for" target="scale_plain"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkScale" id="scale_plain">
@@ -47,11 +48,11 @@
             <accessibility>
               <relation type="labelled-by" target="label_plain"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object class="GtkLabel" id="label_marks">
@@ -60,11 +61,11 @@
             <accessibility>
               <relation type="label-for" target="scale_marks"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
         <child>
           <object class="GtkScale" id="scale_marks">
@@ -83,11 +84,11 @@
             <accessibility>
               <relation type="labelled-by" target="label_marks"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">1</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">1</property>
-          </packing>
         </child>
         <child>
           <object class="GtkLabel" id="label_discrete">
@@ -96,11 +97,11 @@
             <accessibility>
               <relation type="label-for" target="scale_discrete"/>
             </accessibility>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
         <child>
           <object class="GtkScale" id="scale_discrete">
@@ -120,11 +121,11 @@
               <mark value="3" position="bottom"/>
               <mark value="4" position="bottom"/>
             </marks>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">2</property>
-          </packing>
         </child>
       </object>
     </child>

demos/gtk-demo/search_entry.c

@@ -8,8 +8,8 @@
 #include <gtk/gtk.h>
 
 static GtkWidget *window = NULL;
-static GtkWidget *menu = NULL;
 static GtkWidget *notebook = NULL;
+static GSimpleActionGroup *actions = NULL;
 
 static guint search_progress_id = 0;
 static guint finish_search_id = 0;
@@ -83,69 +83,42 @@ stop_search (GtkButton *button,
 }
 
 static void
-clear_entry (GtkEntry *entry)
+clear_entry (GSimpleAction *action,
+             GVariant      *parameter,
+             gpointer       user_data)
 {
-  gtk_editable_set_text (GTK_EDITABLE (entry), "");
+  GtkEditable *editable = user_data;
+
+  gtk_editable_set_text (editable, "");
 }
 
 static void
-search_by_name (GtkWidget *item,
-                GtkEntry  *entry)
+set_search_by (GSimpleAction *action,
+               GVariant      *value,
+               gpointer       user_data)
 {
-  gtk_entry_set_icon_tooltip_text (entry,
-                                   GTK_ENTRY_ICON_PRIMARY,
-                                   "Search by name\n"
-                                   "Click here to change the search type");
-  gtk_entry_set_placeholder_text (entry, "name");
-}
+  GtkEntry *entry = user_data;
+  const char *term;
 
-static void
-search_by_description (GtkWidget *item,
-                       GtkEntry  *entry)
-{
+  term = g_variant_get_string (value, NULL);
 
-  gtk_entry_set_icon_tooltip_text (entry,
-                                   GTK_ENTRY_ICON_PRIMARY,
-                                   "Search by description\n"
-                                   "Click here to change the search type");
-  gtk_entry_set_placeholder_text (entry, "description");
-}
+  g_simple_action_set_state (action, value);
 
-static void
-search_by_file (GtkWidget *item,
-                GtkEntry  *entry)
-{
-  gtk_entry_set_icon_tooltip_text (entry,
-                                   GTK_ENTRY_ICON_PRIMARY,
-                                   "Search by file name\n"
-                                   "Click here to change the search type");
-  gtk_entry_set_placeholder_text (entry, "file name");
-}
-
-GtkWidget *
-create_search_menu (GtkWidget *entry)
-{
-  GtkWidget *menu;
-  GtkWidget *item;
-
-  menu = gtk_menu_new ();
-
-  item = gtk_menu_item_new_with_mnemonic ("Search by _name");
-  g_signal_connect (item, "activate",
-                    G_CALLBACK (search_by_name), entry);
-  gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
-
-  item = gtk_menu_item_new_with_mnemonic ("Search by _description");
-  g_signal_connect (item, "activate",
-                    G_CALLBACK (search_by_description), entry);
-  gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
-
-  item = gtk_menu_item_new_with_mnemonic ("Search by _file name");
-  g_signal_connect (item, "activate",
-                    G_CALLBACK (search_by_file), entry);
-  gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
-
-  return menu;
+  if (g_str_equal (term, "name"))
+    {
+      gtk_entry_set_icon_tooltip_text (entry, GTK_ENTRY_ICON_PRIMARY, "Search by name");
+      gtk_entry_set_placeholder_text (entry, "name");
+    }
+  else if (g_str_equal (term, "description"))
+    {
+      gtk_entry_set_icon_tooltip_text (entry, GTK_ENTRY_ICON_PRIMARY, "Search by description");
+      gtk_entry_set_placeholder_text (entry, "description");
+    }
+  else if (g_str_equal (term, "filename"))
+    {
+      gtk_entry_set_icon_tooltip_text (entry, GTK_ENTRY_ICON_PRIMARY, "Search by file name");
+      gtk_entry_set_placeholder_text (entry, "file name");
+    }
 }
 
 static void
@@ -154,7 +127,28 @@ icon_press_cb (GtkEntry       *entry,
                gpointer        data)
 {
   if (position == GTK_ENTRY_ICON_PRIMARY)
-    gtk_menu_popup_at_pointer (GTK_MENU (menu), NULL);
+    {
+      GAction *action;
+      GVariant *state;
+      GVariant *new_state;
+      const char *s;
+
+      action = g_action_map_lookup_action (G_ACTION_MAP (actions), "search-by");
+      state = g_action_get_state (action);
+      s = g_variant_get_string (state, NULL);
+
+      if (g_str_equal (s, "name"))
+        new_state = g_variant_new_string ("description");
+      else if (g_str_equal (s, "description"))
+        new_state = g_variant_new_string ("filename");
+      else if (g_str_equal (s, "filename"))
+        new_state = g_variant_new_string ("name");
+      else
+        g_assert_not_reached ();
+
+      g_action_change_state (action, new_state);
+      g_variant_unref (state);
+    }
 }
 
 static void
@@ -165,7 +159,6 @@ activate_cb (GtkEntry  *entry,
     return;
 
   start_search (button, entry);
-
 }
 
 static void
@@ -187,32 +180,62 @@ search_entry_destroyed (GtkWidget *widget)
 }
 
 static void
-entry_populate_popup (GtkEntry *entry,
-                      GtkMenu  *menu,
-                      gpointer user_data)
+text_changed (GObject *object,
+              GParamSpec *pspec,
+              gpointer data)
 {
-  GtkWidget *item;
-  GtkWidget *search_menu;
+  GtkEntry *entry = GTK_ENTRY (object);
+  GActionMap *actions = data;
+  GAction *action;
   gboolean has_text;
 
   has_text = gtk_entry_get_text_length (entry) > 0;
 
-  item = gtk_separator_menu_item_new ();
-  gtk_widget_show (item);
-  gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+  action = g_action_map_lookup_action (actions, "clear");
+  g_simple_action_set_enabled (G_SIMPLE_ACTION (action), has_text);
+}
 
-  item = gtk_menu_item_new_with_mnemonic ("C_lear");
-  gtk_widget_show (item);
-  g_signal_connect_swapped (item, "activate",
-                            G_CALLBACK (clear_entry), entry);
-  gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
-  gtk_widget_set_sensitive (item, has_text);
+static GMenuModel *
+create_search_menu_model (void)
+{
+  GMenu *menu = g_menu_new ();
+  g_menu_append (menu, _("Name"), "search.search-by::name");
+  g_menu_append (menu, _("Description"), "search.search-by::description");
+  g_menu_append (menu, _("File Name"), "search.search-by::filename");
 
-  search_menu = create_search_menu (GTK_WIDGET (entry));
-  item = gtk_menu_item_new_with_label ("Search by");
-  gtk_widget_show (item);
-  gtk_menu_item_set_submenu (GTK_MENU_ITEM (item), search_menu);
-  gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+  return G_MENU_MODEL (menu);
+}
+
+static void
+entry_add_to_context_menu (GtkEntry *entry)
+{
+  GMenu *menu;
+  GActionEntry entries[] = {
+    { "clear", clear_entry, NULL, NULL, NULL },
+    { "search-by", NULL, "s", "'name'", set_search_by }
+  };
+  GMenuModel *submenu;
+  GMenuItem *item;
+
+  actions = g_simple_action_group_new ();
+  g_action_map_add_action_entries (G_ACTION_MAP (actions), entries, G_N_ELEMENTS(entries), entry);
+  gtk_widget_insert_action_group (GTK_WIDGET (entry), "search", G_ACTION_GROUP (actions));
+
+  menu = g_menu_new ();
+  item = g_menu_item_new (_("C_lear"), "search.clear");
+  g_menu_item_set_attribute (item, "touch-icon", "s", "edit-clear-symbolic");
+  g_menu_append_item (G_MENU (menu), item);
+  g_object_unref (item);
+
+  submenu = create_search_menu_model ();
+  g_menu_append_submenu (menu, _("Search By"), submenu);
+  g_object_unref (submenu);
+
+  gtk_entry_set_extra_menu (entry, G_MENU_MODEL (menu));
+
+  g_object_unref (menu);
+
+  g_signal_connect (entry, "notify::text", G_CALLBACK (text_changed), actions);
 }
 
 GtkWidget *
@@ -271,29 +294,25 @@ do_search_entry (GtkWidget *do_widget)
       gtk_widget_show (cancel_button);
 
       /* Set up the search icon */
-      search_by_name (NULL, GTK_ENTRY (entry));
+      GVariant *value = g_variant_ref_sink (g_variant_new_string ("name"));
+      set_search_by (NULL, value, entry);
+      g_variant_unref (value);
 
-      /* Set up the clear icon */
-      g_signal_connect (entry, "icon-press",
-                        G_CALLBACK (icon_press_cb), NULL);
-      g_signal_connect (entry, "activate",
-                        G_CALLBACK (activate_cb), NULL);
+      gtk_entry_set_icon_activatable (GTK_ENTRY (entry), GTK_ENTRY_ICON_PRIMARY, TRUE);
+      gtk_entry_set_icon_sensitive (GTK_ENTRY (entry), GTK_ENTRY_ICON_PRIMARY, TRUE);
 
-      /* Create the menu */
-      menu = create_search_menu (entry);
-      gtk_menu_attach_to_widget (GTK_MENU (menu), entry, NULL);
+      g_signal_connect (entry, "icon-press", G_CALLBACK (icon_press_cb), NULL);
+      g_signal_connect (entry, "activate", G_CALLBACK (activate_cb), NULL);
 
       /* add accessible alternatives for icon functionality */
-      g_object_set (entry, "populate-all", TRUE, NULL);
-      g_signal_connect (entry, "populate-popup",
-                        G_CALLBACK (entry_populate_popup), NULL);
+      entry_add_to_context_menu (GTK_ENTRY (entry));
     }
 
   if (!gtk_widget_get_visible (window))
     gtk_widget_show (window);
   else
     {
-      gtk_widget_destroy (menu);
+      g_clear_object (&actions);
       gtk_widget_destroy (window);
     }
 

demos/gtk-demo/shortcuts-boxes.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkShortcutsWindow" id="shortcuts-boxes">
     <property name="modal">1</property>

demos/gtk-demo/shortcuts-builder.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkShortcutsWindow" id="shortcuts-builder">
     <property name="modal">1</property>

demos/gtk-demo/shortcuts-clocks.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkShortcutsWindow" id="shortcuts-clocks">
     <property name="modal">1</property>

demos/gtk-demo/shortcuts-gedit.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkShortcutsWindow" id="shortcuts-gedit">
     <property name="modal">1</property>

demos/gtk-demo/shortcuts.ui

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object class="GtkWindow" id="window1">
     <property name="title" translatable="yes">Shortcuts</property>

demos/gtk-demo/sidebar.c

@@ -65,7 +65,7 @@ do_sidebar (GtkWidget *do_widget)
         {
           if (i == 0)
             {
-              widget = gtk_image_new_from_icon_name ("org.gtk.Demo");
+              widget = gtk_image_new_from_icon_name ("org.gtk.Demo4");
               gtk_image_set_pixel_size (GTK_IMAGE (widget), 256);
             }
           else

demos/gtk-demo/sliding_puzzle.c

@@ -218,17 +218,17 @@ puzzle_key_pressed (GtkEventControllerKey *controller,
 }
 
 static void
-puzzle_button_pressed (GtkGestureMultiPress *gesture,
-                       int                   n_press,
-                       double                x,
-                       double                y,
-                       GtkWidget            *grid)
+puzzle_button_pressed (GtkGestureClick *gesture,
+                       int              n_press,
+                       double           x,
+                       double           y,
+                       GtkWidget       *grid)
 {
   GtkWidget *child;
   int l, t, i;
   int pos;
 
-  child = gtk_widget_pick (grid, x, y);
+  child = gtk_widget_pick (grid, x, y, GTK_PICK_DEFAULT);
 
   if (!child)
     {
@@ -236,10 +236,7 @@ puzzle_button_pressed (GtkGestureMultiPress *gesture,
       return;
     }
 
-  gtk_container_child_get (GTK_CONTAINER (grid), child,
-                           "left-attach", &l,
-                           "top-attach", &t,
-                           NULL);
+  gtk_grid_query_child (GTK_GRID (grid), child, &l, &t, NULL, NULL);
 
   if (l == pos_x && t == pos_y)
     {
@@ -285,6 +282,7 @@ start_puzzle (GdkPaintable *puzzle)
   GtkWidget *picture, *grid;
   GtkEventController *controller;
   guint x, y;
+  float aspect_ratio;
 
   /* Remove the old grid (if there is one) */
   grid = gtk_bin_get_child (GTK_BIN (frame));
@@ -295,7 +293,10 @@ start_puzzle (GdkPaintable *puzzle)
   grid = gtk_grid_new ();
   gtk_widget_set_can_focus (grid, TRUE);
   gtk_container_add (GTK_CONTAINER (frame), grid);
-  gtk_aspect_frame_set (GTK_ASPECT_FRAME (frame), 0.5, 0.5, (float) gdk_paintable_get_intrinsic_aspect_ratio (puzzle), FALSE);
+  aspect_ratio = gdk_paintable_get_intrinsic_aspect_ratio (puzzle);
+  if (aspect_ratio == 0.0)
+    aspect_ratio = 1.0;
+  gtk_aspect_frame_set (GTK_ASPECT_FRAME (frame), 0.5, 0.5, aspect_ratio, FALSE);
 
   /* Add a key event controller so people can use the arrow
    * keys to move the puzzle */
@@ -305,7 +306,7 @@ start_puzzle (GdkPaintable *puzzle)
                     grid);
   gtk_widget_add_controller (GTK_WIDGET (grid), controller);
 
-  controller = GTK_EVENT_CONTROLLER (gtk_gesture_multi_press_new ());
+  controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
   g_signal_connect (controller, "pressed",
                     G_CALLBACK (puzzle_button_pressed),
                     grid);
@@ -448,12 +449,11 @@ do_sliding_puzzle (GtkWidget *do_widget)
       g_signal_connect (apply, "clicked", G_CALLBACK (reconfigure), NULL);
 
       popover = gtk_popover_new (NULL);
-      gtk_popover_set_modal (GTK_POPOVER (popover), TRUE);
       gtk_container_add (GTK_CONTAINER (popover), tweaks);
 
       tweak = gtk_menu_button_new ();
       gtk_menu_button_set_popover (GTK_MENU_BUTTON (tweak), popover);
-      gtk_button_set_icon_name (GTK_BUTTON (tweak), "emblem-system-symbolic");
+      gtk_menu_button_set_icon_name (GTK_MENU_BUTTON (tweak), "emblem-system-symbolic");
 
       restart = gtk_button_new_from_icon_name ("view-refresh-symbolic");
       g_signal_connect (restart, "clicked", G_CALLBACK (reshuffle), NULL);