It is time.

ui/views/controls/tree/tree_view_controller.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_VIEWS_CONTROLS_TREE_TREE_VIEW_CONTROLLER_H_
-#define UI_VIEWS_CONTROLS_TREE_TREE_VIEW_CONTROLLER_H_
-
-#include "ui/events/keycodes/keyboard_codes.h"
-#include "ui/views/views_export.h"
-
-namespace ui {
-class TreeModelNode;
-}
-
-namespace views {
-
-class TreeView;
-
-// TreeViewController ---------------------------------------------------------
-
-// Controller for the treeview.
-class VIEWS_EXPORT TreeViewController {
- public:
-  // Notification that the selection of the tree view has changed. Use
-  // GetSelectedNode to find the current selection.
-  virtual void OnTreeViewSelectionChanged(TreeView* tree_view) = 0;
-
-  // Returns true if the node can be edited. This is only used if the
-  // TreeView is editable.
-  virtual bool CanEdit(TreeView* tree_view, ui::TreeModelNode* node);
-
- protected:
-  virtual ~TreeViewController();
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_TREE_TREE_VIEW_CONTROLLER_H_