panel: Add :overview pseudo class while in overview

The panel used to provide an .in-overview class which was removed after
the theme stopped using it. Classic mode should use a different top bar
style in the overview, so bring it back (but use a pseudo class this
time for consistency with MessageTray and ActivitiesButton).

https://bugzilla.gnome.org/show_bug.cgi?id=693218

diff --git a/js/ui/panel.js b/js/ui/panel.js
index 0a0de0373b23ba73a25d365bb0f604b5f2770c1f..cfeb3511ac98b7fb0f4462d01884216fb7e9a070 100644 (file)
--- a/js/ui/panel.js
+++ b/js/ui/panel.js
@@ -972,6 +972,13 @@ const Panel = new Lang.Class({
         this.actor.connect('allocate', Lang.bind(this, this._allocate));
         this.actor.connect('button-press-event', Lang.bind(this, this._onButtonPress));
 
+        Main.overview.connect('showing', Lang.bind(this, function () {
+            this.actor.add_style_pseudo_class('overview');
+        }));
+        Main.overview.connect('hiding', Lang.bind(this, function () {
+            this.actor.remove_style_pseudo_class('overview');
+        }));
+
         Main.layoutManager.panelBox.add(this.actor);
         Main.ctrlAltTabManager.addGroup(this.actor, _("Top Bar"), 'emblem-system-symbolic',
                                         { sortGroup: CtrlAltTab.SortGroup.TOP });