Add a no selection

This is a GtkSelectionModel that never selects anything.

The equivalent of GTK_SELECTION_MODE_NONE.

gtk/gtk.h

@@ -159,6 +159,7 @@
 #include <gtk/gtkmountoperation.h>
 #include <gtk/gtkmultiselection.h>
 #include <gtk/gtknativedialog.h>
+#include <gtk/gtknoselection.h>
 #include <gtk/gtknotebook.h>
 #include <gtk/gtkorientable.h>
 #include <gtk/gtkoverlay.h>

gtk/gtknoselection.c

@@ -0,0 +1,216 @@
+/*
+ * 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 "gtknoselection.h"
+
+#include "gtkintl.h"
+#include "gtkselectionmodel.h"
+
+/**
+ * SECTION:gtknoselection
+ * @Short_description: A selection model that does not allow selecting items
+ * @Title: GtkNoSelection
+ * @see_also: #GtkSelectionModel
+ *
+ * GtkNoSelection is an implementation of the #GtkSelectionModel interface 
+ * that never selects any items. It can be used where a #GtkSelectionModel
+ * is needed, but selection is not desired.
+ */
+struct _GtkNoSelection
+{
+  GObject parent_instance;
+
+  GListModel *model;
+};
+
+struct _GtkNoSelectionClass
+{
+  GObjectClass parent_class;
+};
+
+enum {
+  PROP_0,
+  PROP_MODEL,
+
+  N_PROPS,
+};
+
+static GParamSpec *properties[N_PROPS] = { NULL, };
+
+static GType
+gtk_no_selection_get_item_type (GListModel *list)
+{
+  return g_list_model_get_item_type (GTK_NO_SELECTION (list)->model);
+}
+
+static guint
+gtk_no_selection_get_n_items (GListModel *list)
+{
+  return g_list_model_get_n_items (GTK_NO_SELECTION (list)->model);
+}
+
+static gpointer
+gtk_no_selection_get_item (GListModel *list,
+                           guint       position)
+{
+  return g_list_model_get_item (GTK_NO_SELECTION (list)->model, position);
+}
+
+static void
+gtk_no_selection_list_model_init (GListModelInterface *iface)
+{
+  iface->get_item_type = gtk_no_selection_get_item_type;
+  iface->get_n_items = gtk_no_selection_get_n_items;
+  iface->get_item = gtk_no_selection_get_item;
+}
+
+static void
+gtk_no_selection_selection_model_init (GtkSelectionModelInterface *iface)
+{
+  /* the default implementation does what we want */
+}
+
+G_DEFINE_TYPE_EXTENDED (GtkNoSelection, gtk_no_selection, G_TYPE_OBJECT, 0,
+                        G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL,
+                                               gtk_no_selection_list_model_init)
+                        G_IMPLEMENT_INTERFACE (GTK_TYPE_SELECTION_MODEL,
+                                               gtk_no_selection_selection_model_init))
+
+static void
+gtk_no_selection_items_changed_cb (GListModel     *model,
+                                   guint           position,
+                                   guint           removed,
+                                   guint           added,
+                                   GtkNoSelection *self)
+{
+  g_list_model_items_changed (G_LIST_MODEL (self), position, removed, added);
+}
+
+static void
+gtk_no_selection_clear_model (GtkNoSelection *self)
+{
+  if (self->model == NULL)
+    return;
+
+  g_signal_handlers_disconnect_by_func (self->model, 
+                                        gtk_no_selection_items_changed_cb,
+                                        self);
+  g_clear_object (&self->model);
+}
+
+static void
+gtk_no_selection_set_property (GObject      *object,
+                               guint         prop_id,
+                               const GValue *value,
+                               GParamSpec   *pspec)
+
+{
+  GtkNoSelection *self = GTK_NO_SELECTION (object);
+
+  switch (prop_id)
+    {
+    case PROP_MODEL:
+      self->model = g_value_dup_object (value);
+      g_warn_if_fail (self->model != NULL);
+      g_signal_connect (self->model, "items-changed",
+                        G_CALLBACK (gtk_no_selection_items_changed_cb), self);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_no_selection_get_property (GObject    *object,
+                               guint       prop_id,
+                               GValue     *value,
+                               GParamSpec *pspec)
+{
+  GtkNoSelection *self = GTK_NO_SELECTION (object);
+
+  switch (prop_id)
+    {
+    case PROP_MODEL:
+      g_value_set_object (value, self->model);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_no_selection_dispose (GObject *object)
+{
+  gtk_no_selection_clear_model (GTK_NO_SELECTION (object));
+
+  G_OBJECT_CLASS (gtk_no_selection_parent_class)->dispose (object);
+}
+
+static void
+gtk_no_selection_class_init (GtkNoSelectionClass *klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  gobject_class->get_property = gtk_no_selection_get_property;
+  gobject_class->set_property = gtk_no_selection_set_property;
+  gobject_class->dispose = gtk_no_selection_dispose;
+
+  /**
+   * GtkNoSelection:model
+   *
+   * The list managed by this selection
+   */
+  properties[PROP_MODEL] =
+    g_param_spec_object ("model",
+                         P_("Model"),
+                         P_("List managed by this selection"),
+                         G_TYPE_LIST_MODEL,
+                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+
+  g_object_class_install_properties (gobject_class, N_PROPS, properties);
+}
+
+static void
+gtk_no_selection_init (GtkNoSelection *self)
+{
+}
+
+/**
+ * gtk_no_selection_new:
+ * @model: (transfer none): the #GListModel to manage
+ *
+ * Creates a new selection to handle @model.
+ *
+ * Returns: (transfer full) (type GtkNoSelection): a new #GtkNoSelection
+ **/
+GListModel *
+gtk_no_selection_new (GListModel *model)
+{
+  g_return_val_if_fail (G_IS_LIST_MODEL (model), NULL);
+
+  return g_object_new (GTK_TYPE_NO_SELECTION,
+                       "model", model,
+                       NULL);
+}

gtk/gtknoselection.h

@@ -0,0 +1,37 @@
+/*
+ * 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>
+ */
+
+#ifndef __GTK_NO_SELECTION_H__
+#define __GTK_NO_SELECTION_H__
+
+#include <gtk/gtktypes.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_NO_SELECTION (gtk_no_selection_get_type ())
+
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GtkNoSelection, gtk_no_selection, GTK, NO_SELECTION, GObject)
+
+GDK_AVAILABLE_IN_ALL
+GListModel * gtk_no_selection_new (GListModel *model);
+
+G_END_DECLS
+
+#endif /* __GTK_NO_SELECTION_H__ */

gtk/meson.build

@@ -293,6 +293,7 @@ gtk_public_sources = files([
   'gtkmultiselection.c',
   'gtknativedialog.c',
   'gtknomediafile.c',
+  'gtknoselection.c',
   'gtknotebook.c',
   'gtkorientable.c',
   'gtkoverlay.c',