Pileus Git - ~andy/gtk/blob - demos/gtk-demo/theming_custom_css.c

   1 /* CSS Theming/Custom CSS
   2  *
   3  * GTK+ uses CSS for theming. If required, applications can
   4  * install their own custom CSS style provider to achieve
   5  * special effects.
   6  *
   7  * Doing this has the downside that your application will no
   8  * longer react to the users theme preferences, so this should
   9  * be used sparingly.
  10  */
  11
  12 #include <gtk/gtk.h>
  13
  14 static GtkWidget *window = NULL;
  15
  16 GtkWidget *
  17 do_theming_custom_css (GtkWidget *do_widget)
  18 {
  19   GtkWidget *box;
  20   GtkWidget *button;
  21   GtkCssProvider *provider;
  22   GBytes *bytes;
  23
  24   if (!window)
  25     {
  26       window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  27       gtk_window_set_screen (GTK_WINDOW (window),
  28                              gtk_widget_get_screen (do_widget));
  29       gtk_window_set_title (GTK_WINDOW (window), "Custom CSS");
  30       gtk_container_set_border_width (GTK_CONTAINER (window), 18);
  31       g_signal_connect (window, "destroy",
  32                         G_CALLBACK (gtk_widget_destroyed), &window);
  33       box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
  34       gtk_container_add (GTK_CONTAINER (window), box);
  35       button = gtk_button_new_with_label ("Plain");
  36       gtk_box_pack_start (GTK_BOX (box), button, TRUE, TRUE, 0);
  37       button = gtk_button_new_with_label ("Fancy");
  38       gtk_box_pack_start (GTK_BOX (box), button, TRUE, TRUE, 0);
  39       gtk_widget_set_name (button, "fancy");
  40
  41       provider = gtk_css_provider_new ();
  42       bytes = g_resources_lookup_data ("/theming_custom_css/fancy.css", 0, NULL);
  43       gtk_css_provider_load_from_data (provider, g_bytes_get_data (bytes, NULL),
  44                                        g_bytes_get_size (bytes), NULL);
  45       gtk_style_context_add_provider_for_screen (gtk_widget_get_screen (do_widget),
  46                                                  GTK_STYLE_PROVIDER (provider),
  47                                                  GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
  48       g_object_unref (provider);
  49       g_bytes_unref (bytes);
  50
  51       gtk_widget_show_all (box);
  52     }
  53
  54   if (!gtk_widget_get_visible (window))
  55     {
  56       gtk_widget_show (window);
  57     }
  58   else
  59     {
  60       gtk_widget_destroy (window);
  61       window = NULL;
  62     }
  63
  64   return window;
  65 }