components/undo/undo_manager_observer.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_UNDO_UNDO_MANAGER_OBSERVER_H_
   6 #define COMPONENTS_UNDO_UNDO_MANAGER_OBSERVER_H_
   7
   8 // Observer for the UndoManager.
   9 class UndoManagerObserver {
  10  public:
  11   // Invoked when the internal state of the UndoManager has changed.
  12   virtual void OnUndoManagerStateChange() = 0;
  13
  14  protected:
  15   virtual ~UndoManagerObserver() {}
  16 };
  17
  18 #endif  // COMPONENTS_UNDO_UNDO_MANAGER_OBSERVER_H_