Add a "devel" CSS theme for our demosdevel-theme

It's useful to know if you're running the demos from an unstable version
of GTK+, so we should use a CSS fragment that updates the visual
identity of gtk-demo and gtk-widget-factory depending on the version of
GTK+ they are running against.

1 files changed, 28 insertions, 0 deletions

diff --git a/demos/widget-factory/widget-factory.c b/demos/widget-factory/widget-factory.c
index 8b8e852dd5..acc8abd450 100644
--- a/demos/widget-factory/widget-factory.c
+++ b/demos/widget-factory/widget-factory.c
@@ -1606,6 +1606,27 @@ adjustment3_value_changed (GtkAdjustment *adj, GtkProgressBar *pbar)
 }
 
 static void
+settings__notify_gtk_theme_name (GObject *gobject,
+                                 GParamSpec *pspec,
+                                 gpointer data)
+{
+  GtkWidget *window = data;
+  char *theme_name = NULL;
+
+  g_object_get (gobject, "gtk-theme-name", &theme_name, NULL);
+
+  if (g_strcmp0 (theme_name, "Adwaita") == 0)
+    {
+      if (gtk_get_minor_version () % 2 != 0)
+        gtk_style_context_add_class (gtk_widget_get_style_context (window), "devel");
+    }
+  else
+    gtk_style_context_remove_class (gtk_widget_get_style_context (window), "devel");
+
+  g_free (theme_name);
+}
+
+static void
 activate (GApplication *app)
 {
   GtkBuilder *builder;
@@ -1680,6 +1701,13 @@ activate (GApplication *app)
                                    win_entries, G_N_ELEMENTS (win_entries),
                                    window);
 
+  g_signal_connect (gtk_settings_get_default (), "notify::gtk-theme-name",
+                    G_CALLBACK (settings__notify_gtk_theme_name),
+                    window);
+  settings__notify_gtk_theme_name (G_OBJECT (gtk_settings_get_default ()),
+                                   NULL,
+                                   window);
+
   for (i = 0; i < G_N_ELEMENTS (accels); i++)
     gtk_application_set_accels_for_action (GTK_APPLICATION (app), accels[i].action_and_target, accels[i].accelerators);