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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H_
      6 #define UI_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H_
      7 
      8 #include "base/observer_list.h"
      9 #include "ui/compositor/layer_animation_observer.h"
     10 #include "ui/views/view.h"
     11 
     12 namespace views {
     13 class ImageView;
     14 }
     15 
     16 namespace app_list {
     17 
     18 // Observer for top icon animation completion.
     19 class TopIconAnimationObserver {
     20  public:
     21   // Called when top icon animation completes.
     22   virtual void OnTopIconAnimationsComplete() {}
     23 
     24  protected:
     25   TopIconAnimationObserver() {}
     26   virtual ~TopIconAnimationObserver() {}
     27 
     28  private:
     29   DISALLOW_COPY_AND_ASSIGN(TopIconAnimationObserver);
     30 };
     31 
     32 // Transitional view used for top item icons animation when opening or closing
     33 // a folder. Owns itself.
     34 class TopIconAnimationView : public views::View,
     35                              public ui::ImplicitAnimationObserver {
     36  public:
     37   // |icon|: The icon image of the item icon of full scale size.
     38   // |scaled_rect|: Bounds of the small icon inside folder icon.
     39   // |open_folder|: Specify open/close folder animation to perform.
     40   // The view will be self-cleaned by the end of animation.
     41   TopIconAnimationView(const gfx::ImageSkia& icon,
     42                        const gfx::Rect& scaled_rect,
     43                        bool open_folder);
     44   virtual ~TopIconAnimationView();
     45 
     46   void AddObserver(TopIconAnimationObserver* observer);
     47   void RemoveObserver(TopIconAnimationObserver* observer);
     48 
     49   // When opening a folder, transform the top item icon from the small icon
     50   // inside folder icon to the full scale icon at the target location.
     51   // When closing a folder, transform the full scale item icon from its
     52   // location to the small icon inside the folder icon.
     53   void TransformView();
     54 
     55  private:
     56   // views::View overrides:
     57   virtual gfx::Size GetPreferredSize() const OVERRIDE;
     58   virtual void Layout() OVERRIDE;
     59 
     60   // ui::ImplicitAnimationObserver overrides:
     61   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
     62   virtual bool RequiresNotificationWhenAnimatorDestroyed() const OVERRIDE;
     63 
     64   gfx::Size icon_size_;
     65   views::ImageView* icon_;  // Owned by views hierarchy.
     66   // Rect of the scaled down top item icon inside folder icon's ink bubble.
     67   gfx::Rect scaled_rect_;
     68   // true: opening folder; false: closing folder.
     69   bool open_folder_;
     70 
     71   ObserverList<TopIconAnimationObserver> observers_;
     72 
     73   DISALLOW_COPY_AND_ASSIGN(TopIconAnimationView);
     74 };
     75 
     76 }  // namespace app_list
     77 
     78 #endif  // UI_APP_LIST_VIEWS_TOP_ICON_ANIMATION_VIEW_H_
     79