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 CHROME_BROWSER_UNDO_UNDO_MANAGER_OBSERVER_H_ 6 #define CHROME_BROWSER_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 // CHROME_BROWSER_UNDO_UNDO_MANAGER_OBSERVER_H_ 19
