Implement animation UI for opening/closing an app list folder.

ui/app_list/views/apps_grid_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 UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 #define UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/timer/timer.h"
 #include "ui/app_list/app_list_export.h"
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/app_list_model_observer.h"
 #include "ui/app_list/pagination_model_observer.h"
 #include "ui/base/models/list_model_observer.h"
+#include "ui/compositor/layer_animation_observer.h"
 #include "ui/views/animation/bounds_animator.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/view.h"
 #include "ui/views/view_model.h"
 
 #if defined(OS_WIN)
 #include "ui/base/dragdrop/drag_source_win.h"
 #endif
 
 namespace content {
@@ skipping 20 matching lines @@
 class AppListItemView;
 class AppsGridViewDelegate;
 class PageSwitcher;
 class PaginationModel;
 
 // AppsGridView displays a grid for AppListItemList sub model.
 class APP_LIST_EXPORT AppsGridView : public views::View,
                                      public views::ButtonListener,
                                      public AppListItemListObserver,
                                      public PaginationModelObserver,
-                                     public AppListModelObserver {
+                                     public AppListModelObserver,
+                                     public ui::ImplicitAnimationObserver {
  public:
   enum Pointer {
     NONE,
     MOUSE,
     TOUCH,
   };
 
   // Constructs the app icon grid view. |delegate| is the delegate of this
   // view, which usually is the hosting AppListView. |pagination_model| is
   // the paging info shared within the launcher UI. |start_page_contents| is
@@ skipping 62 matching lines @@
       const ViewHierarchyChangedDetails& details) OVERRIDE;
   virtual bool GetDropFormats(
       int* formats,
       std::set<OSExchangeData::CustomFormat>* custom_formats) OVERRIDE;
   virtual bool CanDrop(const OSExchangeData& data) OVERRIDE;
   virtual int OnDragUpdated(const ui::DropTargetEvent& event) OVERRIDE;
 
   // Stops the timer that triggers a page flip during a drag.
   void StopPageFlipTimer();
 
+  // Returns the item view of the item at |index|.
+  AppListItemView* GetItemViewAt(int index) const;
+
+  // Show or hide the top item views.
+  void ShowTopItemViews(bool show);

[xiyuan, 2014/01/16 01:46:48]

nit: ShowTopItemViews -> SetTopItemsVisible

[jennyz, 2014/01/16 17:49:52]

Done.

+
+  void ScheduleAnimationToShow(bool show);
+
   // Return the view model for test purposes.
   const views::ViewModel* view_model_for_test() const { return &view_model_; }
 
   // For test: Return if the drag and drop handler was set.
   bool has_drag_and_drop_host_for_test() { return NULL != drag_and_drop_host_; }
 
   // For test: Return if the drag and drop operation gets dispatched.
   bool forward_events_to_drag_and_drop_host_for_test() {
     return forward_events_to_drag_and_drop_host_;
   }
 
   void set_is_root_level(bool value) { is_root_level_ = value; }
 
+  AppListItemView* activated_item_view() const {
+    return activated_item_view_;
+  }
+
  private:
   friend class test::AppsGridViewTestApi;
 
   enum DropAttempt {
     DROP_FOR_NONE,
     DROP_FOR_REORDER,
     DROP_FOR_FOLDER,
   };
 
   // Represents the index to an item view in the grid.
@@ skipping 120 matching lines @@
 
   // Overridden from PaginationModelObserver:
   virtual void TotalPagesChanged() OVERRIDE;
   virtual void SelectedPageChanged(int old_selected, int new_selected) OVERRIDE;
   virtual void TransitionStarted() OVERRIDE;
   virtual void TransitionChanged() OVERRIDE;
 
   // Overridden from AppListModelObserver:
   virtual void OnAppListModelStatusChanged() OVERRIDE;
 
+  // ui::ImplicitAnimationObserver overrides:
+  virtual void OnImplicitAnimationsCompleted() OVERRIDE;
+
   // Hide a given view temporarily without losing (mouse) events and / or
   // changing the size of it. If |immediate| is set the change will be
   // immediately applied - otherwise it will change gradually.
   // If |hide| is set the view will get hidden, otherwise it gets shown.
   void SetViewHidden(views::View* view, bool hide, bool immediate);
 
   // Whether the folder drag-and-drop UI should be enabled.
   bool EnableFolderDragDropUI();
 
   // Whether target specified by |drap_target| can accept more items to be
@@ skipping 102 matching lines @@
 
   // Delay in milliseconds of when |page_flip_timer_| should fire after user
   // drags an item near the edges.
   int page_flip_delay_in_ms_;
 
   views::BoundsAnimator bounds_animator_;
 
   // If true, AppsGridView is rending items at the root level of the app list.
   bool is_root_level_;
 
+  // The most recent activated item view.
+  AppListItemView* activated_item_view_;
+
+  // Animated to show or hide the view.
+  bool animate_to_show_;
+
   DISALLOW_COPY_AND_ASSIGN(AppsGridView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_