tests: Add a test for a permanently changing listview

This is mostly for dealing with proper anchoring and can be used to
check that things don't scroll or that selection and focus handling
properly works.

For comparison purposes, a ListBox is provided next to it.

tests/meson.build

@@ -60,6 +60,7 @@ gtk_tests = [
   ['testlist3'],
   ['testlist4'],
   ['testlistview'],
+  ['testlistview-animating'],
   ['testlevelbar'],
   ['testlockbutton'],
   ['testmenubutton'],

tests/testlistview-animating.c

@@ -0,0 +1,138 @@
+#include <gtk/gtk.h>
+
+#define AVERAGE 300
+#define VARIANCE 200
+
+static GtkWidget *
+create_widget (gpointer unused)
+{
+  return gtk_label_new ("");
+}
+
+static void
+bind_widget (GtkWidget *widget,
+             gpointer   item,
+             gpointer   unused)
+{
+  const char *message = g_object_get_data (item, "message");
+
+  gtk_label_set_text (GTK_LABEL (widget), message);
+}
+
+static GtkWidget *
+create_widget_for_listbox (gpointer item,
+                           gpointer unused)
+{
+  GtkWidget *widget;
+
+  widget = create_widget (unused);
+  bind_widget (widget, item, unused);
+
+  return widget;
+}
+
+static void
+add (GListStore *store)
+{
+  static guint counter;
+  GObject *o;
+  char *message;
+  guint pos;
+
+  o = g_object_new (G_TYPE_OBJECT, NULL);
+  message = g_strdup_printf ("Item %u", ++counter);
+  g_object_set_data_full (o, "message", message, g_free);
+
+  pos = g_random_int_range (0, g_list_model_get_n_items (G_LIST_MODEL (store)) + 1);
+  g_list_store_insert (store, pos, o);
+  g_object_unref (o);
+}
+
+static void
+delete (GListStore *store)
+{
+  guint pos;
+
+  pos = g_random_int_range (0, g_list_model_get_n_items (G_LIST_MODEL (store)));
+  g_list_store_remove (store, pos);
+}
+
+static gboolean
+do_stuff (gpointer store)
+{
+  if (g_random_int_range (AVERAGE - VARIANCE, AVERAGE + VARIANCE) < g_list_model_get_n_items (store))
+    delete (store);
+  else
+    add (store);
+
+  return G_SOURCE_CONTINUE;
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  GtkWidget *win, *hbox, *vbox, *sw, *listview, *listbox, *label;
+  GListStore *store;
+  guint i;
+
+  gtk_init ();
+
+  win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_default_size (GTK_WINDOW (win), 400, 600);
+  g_signal_connect (win, "destroy", G_CALLBACK (gtk_main_quit), win);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_container_add (GTK_CONTAINER (win), hbox);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+  gtk_container_add (GTK_CONTAINER (hbox), vbox);
+
+  label = gtk_label_new ("GtkListView");
+  gtk_container_add (GTK_CONTAINER (vbox), label);
+
+  sw = gtk_scrolled_window_new (NULL, NULL);
+  gtk_widget_set_hexpand (sw, TRUE);
+  gtk_widget_set_vexpand (sw, TRUE);
+  gtk_container_add (GTK_CONTAINER (vbox), sw);
+
+  listview = gtk_list_view_new ();
+  gtk_list_view_set_functions (GTK_LIST_VIEW (listview),
+                               create_widget,
+                               bind_widget,
+                               NULL, NULL);
+  gtk_container_add (GTK_CONTAINER (sw), listview);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+  gtk_container_add (GTK_CONTAINER (hbox), vbox);
+
+  label = gtk_label_new ("GtkListBox");
+  gtk_container_add (GTK_CONTAINER (vbox), label);
+
+  sw = gtk_scrolled_window_new (NULL, NULL);
+  gtk_widget_set_hexpand (sw, TRUE);
+  gtk_widget_set_vexpand (sw, TRUE);
+  gtk_container_add (GTK_CONTAINER (vbox), sw);
+
+  listbox = gtk_list_box_new ();
+  gtk_container_add (GTK_CONTAINER (sw), listbox);
+
+  store = g_list_store_new (G_TYPE_OBJECT);
+  for (i = 0; i < AVERAGE; i++)
+    add (store);
+  gtk_list_view_set_model (GTK_LIST_VIEW (listview), G_LIST_MODEL (store));
+  gtk_list_box_bind_model (GTK_LIST_BOX (listbox),
+                           G_LIST_MODEL (store),
+                           create_widget_for_listbox,
+                           NULL, NULL);
+
+  g_timeout_add (100, do_stuff, store);
+
+  gtk_widget_show (win);
+
+  gtk_main ();
+
+  g_object_unref (store);
+
+  return 0;
+}