Implement ui for re-parenting an item from an app list folder to another position or folder in the …

ui/app_list/app_list_folder_item.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_APP_LIST_FOLDER_ITEM_H_
 #define UI_APP_LIST_APP_LIST_FOLDER_ITEM_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 18 matching lines @@
 
   explicit AppListFolderItem(const std::string& id);
   virtual ~AppListFolderItem();
 
   // Updates the folder's icon.
   void UpdateIcon();
 
   // Returns the icon of one of the top items with |item_index|.
   const gfx::ImageSkia& GetTopIcon(size_t item_index);
 
+  // Returns the target icon bounds for |item| to fly back to its parent folder
+  // icon in animation UI. If |item| is one of the top item icon, this will
+  // match its corresponding top item icon in the folder icon. Otherwise,
+  // the target icon bounds is centered at the |folder_icon_bounds| with
+  // the same size of the top item icon.
+  // The Rect returned is in the same coordinates of |folder_icon_bounds|.
+  gfx::Rect GetTargetIconRectInFolderForItem(
+      AppListItem* item, const gfx::Rect& folder_icon_bounds);
+
   AppListItemList* item_list() { return item_list_.get(); }
   const AppListItemList* item_list() const { return item_list_.get(); }
 
   // AppListItem
   virtual void Activate(int event_flags) OVERRIDE;
   virtual const char* GetItemType() const OVERRIDE;
   virtual ui::MenuModel* GetContextMenuModel() OVERRIDE;
   virtual AppListItem* FindChildItem(const std::string& id) OVERRIDE;
   virtual size_t ChildItemCount() const OVERRIDE;
   virtual bool CompareForTest(const AppListItem* other) const OVERRIDE;
@@ skipping 27 matching lines @@
   scoped_ptr<AppListItemList> item_list_;
   // Top items for generating folder icon.
   std::vector<AppListItem*> top_items_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListFolderItem);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_FOLDER_ITEM_H_