It is time.

ui/views/controls/table/table_view_observer.h

-// Copyright (c) 2011 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_TABLE_TABLE_VIEW_OBSERVER_H_
-#define UI_VIEWS_CONTROLS_TABLE_TABLE_VIEW_OBSERVER_H_
-
-#include "ui/events/keycodes/keyboard_codes.h"
-#include "ui/views/views_export.h"
-
-namespace views {
-
-class TableView;
-class TableView2;
-
-// TableViewObserver is notified about the TableView selection.
-class VIEWS_EXPORT TableViewObserver {
- public:
-  virtual ~TableViewObserver() {}
-
-  // Invoked when the selection changes.
-  virtual void OnSelectionChanged() = 0;
-
-  // Optional method invoked when the user double clicks on the table.
-  virtual void OnDoubleClick() {}
-
-  // Optional method invoked when the user middle clicks on the table.
-  virtual void OnMiddleClick() {}
-
-  // Optional method invoked when the user hits a key with the table in focus.
-  virtual void OnKeyDown(ui::KeyboardCode virtual_keycode) {}
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_TABLE_TABLE_VIEW_OBSERVER_H_