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 <utility>
 #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/focus/focus_manager.h"
 #include "ui/views/view.h"
 
 namespace views {
 class BoundsAnimator;
 class ImageButton;
 class MenuRunner;
 class ViewModel;
 }
 
 namespace ash {
 
 class LauncherDelegate;
 struct LauncherItem;
+class LauncherIconObserver;
 class LauncherModel;
 
 namespace internal {
 
 class LauncherButton;
 
 class ASH_EXPORT LauncherView : public views::View,
                                 public LauncherModelObserver,
                                 public views::ButtonListener,
                                 public LauncherButtonHost,
@@ skipping 19 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 AddIconObserver(LauncherIconObserver* observer);
+  void RemoveIconObserver(LauncherIconObserver* observer);
+
   // Returns true if we're showing a menu.
   bool IsShowingMenu() const;
 
   // Overridden from FocusTraversable:
   virtual views::FocusSearch* GetFocusSearch() OVERRIDE;
   virtual FocusTraversable* GetFocusTraversableParent() OVERRIDE;
   virtual View* GetFocusTraversableParentView() OVERRIDE;
 
  private:
   class FadeOutAnimationDelegate;
@@ skipping 112 matching lines @@
   LauncherID context_menu_id_;
 
   scoped_ptr<views::FocusSearch> focus_search_;
 
 #if !defined(OS_MACOSX)
   scoped_ptr<views::MenuRunner> overflow_menu_runner_;
 
   scoped_ptr<views::MenuRunner> launcher_menu_runner_;
 #endif
 
+  ObserverList<LauncherIconObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(LauncherView);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_VIEW_H_