Implement app list folder management page UI.

ui/app_list/views/apps_container_view.h

Index: ui/app_list/views/apps_container_view.h
diff --git a/ui/app_list/views/apps_container_view.h b/ui/app_list/views/apps_container_view.h
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+// 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 "ui/views/view.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace app_list {
+
+class AppsGridView;
+class AppListFolderItem;
+class AppListFolderView;
+class AppListMainView;
+class AppListModel;
+class ContentsView;
+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:
+  AppsContainerView(AppListMainView* app_list_main_view,
+                    PaginationModel* pagination_model,
+                    AppListModel* model,
+                    content::WebContents* start_page_contents);
+  virtual ~AppsContainerView();
+
+  // Shows the active folder content specified by |folder_item|.
+  void ShowActiveFolder(AppListFolderItem* folder_item);
+
+  // Shows the apps list from root.
+  void ShowApps();
+
+  // Overridden from views::View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void Layout() OVERRIDE;
+
+  AppsGridView* apps_grid_view() { return apps_grid_view_; }
+
+ private:
+  enum ShowState {
+    SHOW_APPS,
+    SHOW_ACTIVE_FOLDER,
+  };
+
+  void SetShowState(ShowState show_state);
+
+  AppListModel* model_;
+  AppsGridView* apps_grid_view_;  // Owned by views hierarchy.
+  AppListFolderView* app_list_folder_view_;  // Owned by views hierarchy.
+  ShowState show_state_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppsContainerView);
+};
+
+}  // namespace app_list
+
+
+#endif  // UI_APP_LIST_VIEWS_APPS_CONTAINER_VIEW_H_