Layout panels on top of their launcher icons

ash/launcher/launcher_view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_LAUNCHER_LAUNCHER_VIEW_H_
 #define ASH_LAUNCHER_LAUNCHER_VIEW_H_
 #pragma once
 
 #include <vector>
 
 #include "ash/launcher/launcher_button_host.h"
 #include "ash/launcher/launcher_model_observer.h"
+#include "base/observer_list.h"
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/view.h"
 
 namespace views {
 class BoundsAnimator;
 class ImageButton;
 class MenuRunner;
 }
 
 namespace ash {
 
 class LauncherDelegate;
 struct LauncherItem;
+class LauncherIconsObserver;
 class LauncherModel;
 class LauncherWindowCycler;
 class ViewModel;
 
 namespace internal {
 
 class LauncherButton;
 
 class ASH_EXPORT LauncherView : public views::View,
                                 public LauncherModelObserver,
@@ skipping 20 matching lines @@
 
   LauncherView(LauncherModel* model, LauncherDelegate* delegate);
   virtual ~LauncherView();
 
   void Init();
 
   // Returns the ideal bounds of the specified item, or an empty rect if id
   // isn't know.
   gfx::Rect GetIdealBoundsOfItemIcon(LauncherID id);
 
+  void AddIconsObserver(LauncherIconsObserver* observer);
+  void RemoveIconsObserver(LauncherIconsObserver* observer);
+
  private:
   class FadeOutAnimationDelegate;
   class StartFadeAnimationDelegate;
 
   struct IdealBounds {
     gfx::Rect overflow_bounds;
   };
 
   // Sets the bounds of each view to its ideal bounds.
   void LayoutToIdealBounds();
@@ skipping 101 matching lines @@
 
 #if !defined(OS_MACOSX)
   scoped_ptr<views::MenuRunner> overflow_menu_runner_;
 
   scoped_ptr<views::MenuRunner> launcher_menu_runner_;
 #endif
 
   // Used to handle cycling among windows.
   scoped_ptr<LauncherWindowCycler> cycler_;
 
+  ObserverList<LauncherIconsObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(LauncherView);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_VIEW_H_