File: undo_manager_observer.h

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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_UNDO_UNDO_MANAGER_OBSERVER_H_
#define COMPONENTS_UNDO_UNDO_MANAGER_OBSERVER_H_

// Observer for the UndoManager.
class UndoManagerObserver {
 public:
  // Invoked when the internal state of the UndoManager has changed.
  virtual void OnUndoManagerStateChange() = 0;
  // Invoked when the UndoManager is being shut down, the UndoManager won't be
  // accessible after this call. It's required for the observer to deregister
  // from the manager.
  virtual void OnUndoManagerShutdown() = 0;

 protected:
  virtual ~UndoManagerObserver() = default;
};

#endif  // COMPONENTS_UNDO_UNDO_MANAGER_OBSERVER_H_