components/ui/zoom/zoom_event_manager_observer.h

   1 // Copyright 2015 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_UI_ZOOM_ZOOM_EVENT_MANAGER_OBSERVER_H_
   6 #define COMPONENTS_UI_ZOOM_ZOOM_EVENT_MANAGER_OBSERVER_H_
   7
   8 namespace ui_zoom {
   9
  10 class ZoomEventManagerObserver {
  11  public:
  12   // TODO(wjmaclean): convert existing ZoomLevelChangedCallbacks to be
  13   // observers.
  14   virtual void OnZoomLevelChanged() {}
  15   virtual void OnDefaultZoomLevelChanged() {}
  16
  17  protected:
  18   virtual ~ZoomEventManagerObserver() {}
  19 };
  20
  21 }  // namespace ui_zoom
  22
  23 #endif  // COMPONENTS_UI_ZOOM_ZOOM_EVENT_MANAGER_OBSERVER_H_