[nautilus] desktop-window: restore transparency

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 7f0e1b0c6869eb826e6c20d31c81bd917779db8f
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Jan 20 11:42:17 2016 +0200

    desktop-window: restore transparency
    
    And in same time port away from deprecated override_background_color
    function.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=760790

 src/nautilus-desktop-window.c |   21 +++++++++++++++++++--
 1 files changed, 19 insertions(+), 2 deletions(-)
---
diff --git a/src/nautilus-desktop-window.c b/src/nautilus-desktop-window.c
index 3283510..6714903 100644
--- a/src/nautilus-desktop-window.c
+++ b/src/nautilus-desktop-window.c
@@ -165,7 +165,6 @@ nautilus_desktop_window_constructed (GObject *obj)
 {
        AtkObject *accessible;
        NautilusDesktopWindow *window = NAUTILUS_DESKTOP_WINDOW (obj);
-        GdkRGBA transparent = {0, 0, 0, 0};
 
        G_OBJECT_CLASS (nautilus_desktop_window_parent_class)->constructed (obj);
 
@@ -203,7 +202,6 @@ nautilus_desktop_window_constructed (GObject *obj)
                 * Note that nautilus_desktop_window_init is too early to do this.
                 */
                nautilus_desktop_window_update_directory (window);
-               gtk_widget_override_background_color (GTK_WIDGET (window), 0, &transparent);
 
                /* We realize it immediately so that the NAUTILUS_DESKTOP_WINDOW_ID
                 * property is set so gnome-settings-daemon doesn't try to set
@@ -217,8 +215,25 @@ nautilus_desktop_window_constructed (GObject *obj)
 static void
 nautilus_desktop_window_init (NautilusDesktopWindow *window)
 {
+       const gchar *css;
+       GtkCssProvider *provider;
+
        window->details = G_TYPE_INSTANCE_GET_PRIVATE (window, NAUTILUS_TYPE_DESKTOP_WINDOW,
                                                       NautilusDesktopWindowDetails);
+
+       css = "nautilus-desktop-window,"
+             "nautilus-desktop-window notebook {"
+             "    background: transparent;"
+             "}";
+
+       provider = gtk_css_provider_new ();
+       gtk_css_provider_load_from_data (provider, css, -1, NULL);
+
+       gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
+                                                  GTK_STYLE_PROVIDER (provider),
+                                                  GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+
+       g_object_unref (provider);
 }
 
 static void
@@ -391,6 +406,8 @@ nautilus_desktop_window_class_init (NautilusDesktopWindowClass *klass)
        nclass->sync_title = real_sync_title;
        nclass->close = real_window_close;
 
+       gtk_widget_class_set_css_name (wclass, "nautilus-desktop-window");
+
        g_type_class_add_private (klass, sizeof (NautilusDesktopWindowDetails));
 }