Refactor app list event handling and prerendering.

ui/app_list/views/apps_container_view.h

 // Copyright 2013 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_CONTAINER_VIEW_H_
 #define UI_APP_LIST_VIEWS_APPS_CONTAINER_VIEW_H_
 
 #include <vector>
 
 #include "ui/app_list/app_list_folder_item.h"
 #include "ui/app_list/views/top_icon_animation_view.h"
 #include "ui/views/view.h"
 
 namespace app_list {
 
 class AppsGridView;
 class ApplicationDragAndDropHost;
 class AppListFolderItem;
 class AppListFolderView;
 class AppListMainView;
 class AppListModel;
 class ContentsView;
 class FolderBackgroundView;
+class PaginationModel;
 
 // AppsContainerView contains a root level AppsGridView to render the root level
 // app items, and a AppListFolderView to render the app items inside the
 // active folder. Only one if them is visible to user at any time.
 class AppsContainerView : public views::View,
                           public TopIconAnimationObserver {
  public:
   AppsContainerView(AppListMainView* app_list_main_view,
                     AppListModel* model);
   virtual ~AppsContainerView();
@@ skipping 20 matching lines @@
   // re-parenting a child item of |folder_item|.
   void ReparentFolderItemTransit(AppListFolderItem* folder_item);
 
   // Returns true if it is currently showing an active folder page.
   bool IsInFolderView() const;
 
   // views::View overrides:
   virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
+  virtual bool OnMouseWheel(const ui::MouseWheelEvent& event) OVERRIDE;
+
+  // Overridden from ui::EventHandler:
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;

[calamity, 2014/08/26 08:12:34]

Should this be part of the AppsGridView instead?

[Matt Giuca, 2014/08/28 00:35:21]

Done.

 
   // TopIconAnimationObserver overrides:
   virtual void OnTopIconAnimationsComplete() OVERRIDE;
 
   AppsGridView* apps_grid_view() { return apps_grid_view_; }
   FolderBackgroundView* folder_background_view() {
      return folder_background_view_;
   }
   AppListFolderView* app_list_folder_view() { return app_list_folder_view_; }
 
  private:
   enum ShowState {
     SHOW_NONE,  // initial state
     SHOW_APPS,
     SHOW_ACTIVE_FOLDER,
     SHOW_ITEM_REPARENT,
   };
 
   void SetShowState(ShowState show_state, bool show_apps_with_animation);
 
   // Calculates the top item icon bounds in the active folder icon. The bounds
   // is relative to AppsContainerView.
   // Returns the bounds of top items' icon in sequence of top left, top right,
   // bottom left, bottom right.
   Rects GetTopItemIconBoundsInActiveFolder();
 
+  // Gets the PaginationModel owned by the AppsGridView.
+  PaginationModel* GetPaginationModel();
+
   // Creates the transitional views for animating the top items in the folder
   // when opening or closing a folder.
   void CreateViewsForFolderTopItemsAnimation(
       AppListFolderItem* active_folder, bool open_folder);
 
   void PrepareToShowApps(AppListFolderItem* folder_item);
 
   AppListModel* model_;
   AppsGridView* apps_grid_view_;  // Owned by views hierarchy.
   AppListFolderView* app_list_folder_view_;  // Owned by views hierarchy.
   FolderBackgroundView* folder_background_view_;  // Owned by views hierarchy.
   ShowState show_state_;
 
   // The transitional views for animating the top items in folder
   // when opening or closing a folder.
   std::vector<views::View*> top_icon_views_;
 
   size_t top_icon_animation_pending_count_;
 
   DISALLOW_COPY_AND_ASSIGN(AppsContainerView);
 };
 
 }  // namespace app_list
 
 
 #endif  // UI_APP_LIST_VIEWS_APPS_CONTAINER_VIEW_H_