[gnome-shell] st-scroll-bar: Add support for :active

[Florian MÃllner <fmuellner src gnome org>]

commit aa120e09020b51738d261a75ae0028e0064f09a9
Author: Florian MÃllner <fmuellner gnome org>
Date:   Wed Aug 1 14:15:03 2012 +0200

    st-scroll-bar: Add support for :active
    
    Add the :active pseudo class to the handle while it is dragged.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=680974

 src/st/st-scroll-bar.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/st/st-scroll-bar.c b/src/st/st-scroll-bar.c
index 8353109..172d4a8 100644
--- a/src/st/st-scroll-bar.c
+++ b/src/st/st-scroll-bar.c
@@ -591,6 +591,8 @@ stop_scrolling (StScrollBar *bar)
   if (!bar->priv->capture_handler)
     return;
 
+  st_widget_remove_style_pseudo_class (bar->priv->handle, "active");
+
   stage = CLUTTER_STAGE (clutter_actor_get_stage (bar->priv->trough));
   g_signal_handler_disconnect (stage, bar->priv->capture_handler);
   bar->priv->capture_handler = 0;
@@ -651,6 +653,8 @@ handle_button_press_event_cb (ClutterActor       *actor,
                                             &priv->y_origin))
     return FALSE;
 
+  st_widget_add_style_pseudo_class (priv->handle, "active");
+
   /* Account for the scrollbar-trough-handle nesting. */
   priv->x_origin += clutter_actor_get_x (priv->trough);
   priv->y_origin += clutter_actor_get_y (priv->trough);