ash: Update app list button.

ash/wm/app_list_controller.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_WM_APP_LIST_CONTROLLER_H_
 #define ASH_WM_APP_LIST_CONTROLLER_H_
 
 #include "ash/launcher/launcher_icon_observer.h"
 #include "ash/shell_observer.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/observer_list.h"
 #include "base/timer.h"
 #include "ui/app_list/pagination_model_observer.h"
 #include "ui/aura/client/focus_change_observer.h"
 #include "ui/aura/root_window_observer.h"
 #include "ui/base/events/event_handler.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace app_list {
 class AppListView;
 class PaginationModel;
 }
 
 namespace ui {
 class LocatedEvent;
 }
 
 namespace ash {
+
+class Shell;
+
 namespace internal {
 
+class AppListControllerObserver;
+
 // AppListController is a controller that manages app list UI for shell.
 // It creates AppListView and schedules showing/hiding animation.
 // While the UI is visible, it monitors things such as app list widget's
 // activation state and desktop mouse click to auto dismiss the UI.
 class AppListController : public ui::EventHandler,
                           public aura::client::FocusChangeObserver,
                           public aura::RootWindowObserver,
                           public ui::ImplicitAnimationObserver,
                           public views::WidgetObserver,
                           public ShellObserver,
                           public LauncherIconObserver,
                           public app_list::PaginationModelObserver {
  public:
-  AppListController();
+  explicit AppListController(Shell* shell);
   virtual ~AppListController();
 
+  // Closes opened app list and cleans up its dependency on shell.
+  void Shutdown();
+
   // Show/hide app list window. The |window| is used to deterime in
   // which display (in which the |window| exists) the app list should
   // be shown.
   void SetVisible(bool visible, aura::Window* window);
 
   // Whether app list window is visible (shown or being shown).
   bool IsVisible() const;
 
+  // Convenience wrapper to toggle visibility using the SetVisible() and
+  // IsVisible().
+  void Toggle(aura::Window* window);
+
   // Returns target visibility. This differs from IsVisible() if an animation
   // is ongoing.
   bool GetTargetVisibility() const { return is_visible_; }
 
   // Returns app list window or NULL if it is not visible.
   aura::Window* GetWindow();
 
+  void AddObserver(AppListControllerObserver* observer);
+  void RemoveObserver(AppListControllerObserver* observer);
+
  private:
   // Sets the app list view and attempts to show it.
   void SetView(app_list::AppListView* view);
 
   // Forgets the view.
   void ResetView();
 
   // Starts show/hide animation.
   void ScheduleAnimation();
 
@@ skipping 24 matching lines @@
   virtual void OnShelfAlignmentChanged(aura::RootWindow* root_window) OVERRIDE;
 
   // LauncherIconObserver overrides:
   virtual void OnLauncherIconPositionsChanged() OVERRIDE;
 
   // app_list::PaginationModelObserver overrides:
   virtual void TotalPagesChanged() OVERRIDE;
   virtual void SelectedPageChanged(int old_selected, int new_selected) OVERRIDE;
   virtual void TransitionChanged() OVERRIDE;
 
+  Shell* shell_;
+
   scoped_ptr<app_list::PaginationModel> pagination_model_;
 
   // Whether we should show or hide app list widget.
   bool is_visible_;
 
   // The AppListView this class manages, owned by its widget.
   app_list::AppListView* view_;
 
   // Cached bounds of |view_| for snapping back animation after over-scroll.
   gfx::Rect view_bounds_;
 
   // Whether should schedule snap back animation.
   bool should_snap_back_;
 
+  ObserverList<AppListControllerObserver, true> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(AppListController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_APP_LIST_CONTROLLER_H_