[gtk/wip/otte/listview: 148/207] demo: Add a GSettings tree demo

[Benjamin Otte <otte src gnome org>]

commit b863d30987b9b89d06ee5d334d3d81052e0b2f0f
Author: Benjamin Otte <otte redhat com>
Date:   Sun Oct 13 07:40:58 2019 +0200

    demo: Add a GSettings tree demo
    
    It is meant to look somewhat like dconf-editor when it is done.
    
    So far, it's just a list.

 demos/gtk-demo/demo.gresource.xml  |   1 +
 demos/gtk-demo/listview_settings.c | 147 +++++++++++++++++++++++++++++++++++++
 demos/gtk-demo/meson.build         |   1 +
 3 files changed, 149 insertions(+)
---
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index 5a10443208..be78211350 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -199,6 +199,7 @@
     <file>infobar.c</file>
     <file>links.c</file>
     <file>listbox.c</file>
+    <file>listview_settings.c</file>
     <file>listview_weather.c</file>
     <file>list_store.c</file>
     <file>markup.c</file>
diff --git a/demos/gtk-demo/listview_settings.c b/demos/gtk-demo/listview_settings.c
new file mode 100644
index 0000000000..1c942df910
--- /dev/null
+++ b/demos/gtk-demo/listview_settings.c
@@ -0,0 +1,147 @@
+/* Lists/Settings
+ *
+ * This demo shows a settings viwer for GSettings.
+ *
+ * It demonstrates how to implement support for trees with listview.
+ */
+
+#include <gtk/gtk.h>
+
+static int
+strvcmp (gconstpointer p1,
+         gconstpointer p2)
+{
+  const char * const *s1 = p1;
+  const char * const *s2 = p2;
+
+  return strcmp (*s1, *s2);
+}
+
+static GListModel *
+create_settings_model (gpointer item,
+                       gpointer unused)
+{
+  GSettings *settings = item;
+  char **schemas;
+  GListStore *result;
+  guint i;
+
+  if (settings == NULL)
+    {
+      g_settings_schema_source_list_schemas (g_settings_schema_source_get_default (),
+                                             TRUE,
+                                             &schemas,
+                                             NULL);
+    }
+  else
+    {
+      schemas = g_settings_list_children (settings);
+    }
+
+  if (schemas == NULL || schemas[0] == NULL)
+    {
+      g_free (schemas);
+      return NULL;
+    }
+
+  qsort (schemas, g_strv_length (schemas), sizeof (char *), strvcmp);
+
+  result = g_list_store_new (G_TYPE_SETTINGS);
+  for (i = 0;  schemas[i] != NULL; i++)
+    {
+      GSettings *child;
+
+      if (settings == NULL)
+        child = g_settings_new (schemas[i]);
+      else
+        child = g_settings_get_child (settings, schemas[i]);
+
+      g_list_store_append (result, child);
+      g_object_unref (child);
+    }
+
+  return G_LIST_MODEL (result);
+}
+
+static void
+setup_widget (GtkListItem *list_item,
+              gpointer     unused)
+{
+  GtkWidget *label, *expander;
+
+  expander = gtk_tree_expander_new ();
+  gtk_list_item_set_child (list_item, expander);
+
+  label = gtk_label_new (NULL);
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_tree_expander_set_child (GTK_TREE_EXPANDER (expander), label);
+}
+
+static void
+bind_widget (GtkListItem *list_item,
+             gpointer     unused)
+{
+  GSettings *settings;
+  GtkWidget *label, *expander;
+  GSettingsSchema *schema;
+
+  expander = gtk_list_item_get_child (list_item);
+  gtk_tree_expander_set_list_row (GTK_TREE_EXPANDER (expander), gtk_list_item_get_item (list_item));
+  label = gtk_tree_expander_get_child (GTK_TREE_EXPANDER (expander));
+  settings = gtk_tree_expander_get_item (GTK_TREE_EXPANDER (expander));
+
+  g_object_get (settings, "settings-schema", &schema, NULL);
+
+  gtk_label_set_label (GTK_LABEL (label), g_settings_schema_get_id (schema));
+
+  g_settings_schema_unref (schema);
+}
+
+static GtkWidget *window = NULL;
+
+GtkWidget *
+do_listview_settings (GtkWidget *do_widget)
+{
+  if (window == NULL)
+    {
+      GtkWidget *listview, *sw;;
+      GListModel *model;
+      GtkTreeListModel *treemodel;
+
+      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+      gtk_window_set_default_size (GTK_WINDOW (window), 400, 600);
+      gtk_window_set_display (GTK_WINDOW (window),
+                              gtk_widget_get_display (do_widget));
+      gtk_window_set_title (GTK_WINDOW (window), "Settings");
+      g_signal_connect (window, "destroy",
+                        G_CALLBACK(gtk_widget_destroyed), &window);
+
+      sw = gtk_scrolled_window_new (NULL, NULL);
+      gtk_container_add (GTK_CONTAINER (window), sw);
+    
+      listview = gtk_list_view_new_with_factory (
+        gtk_functions_list_item_factory_new (setup_widget,
+                                             bind_widget,
+                                             NULL, NULL));
+
+      model = create_settings_model (NULL, NULL);
+      treemodel = gtk_tree_list_model_new (FALSE,
+                                           model,
+                                           TRUE,
+                                           create_settings_model,
+                                           NULL,
+                                           NULL);
+      gtk_list_view_set_model (GTK_LIST_VIEW (listview), G_LIST_MODEL (treemodel));
+      g_object_unref (treemodel);
+      g_object_unref (model);
+
+      gtk_container_add (GTK_CONTAINER (sw), listview);
+    }
+
+  if (!gtk_widget_get_visible (window))
+    gtk_widget_show (window);
+  else
+    gtk_widget_destroy (window);
+
+  return window;
+}
diff --git a/demos/gtk-demo/meson.build b/demos/gtk-demo/meson.build
index aa4098090b..f1f1ad11df 100644
--- a/demos/gtk-demo/meson.build
+++ b/demos/gtk-demo/meson.build
@@ -44,6 +44,7 @@ demos = files([
   'listbox.c',
   'flowbox.c',
   'list_store.c',
+  'listview_settings.c',
   'listview_weather.c',
   'markup.c',
   'menus.c',