components/ui/zoom/zoom_observer.h

   1 // Copyright (c) 2012 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_OBSERVER_H_
   6 #define COMPONENTS_UI_ZOOM_ZOOM_OBSERVER_H_
   7
   8 #include "components/ui/zoom/zoom_controller.h"
   9
  10 namespace ui_zoom {
  11
  12 // Interface for objects that wish to be notified of changes in ZoomController.
  13 class ZoomObserver {
  14  public:
  15   // Notification that the zoom percentage has changed.
  16   virtual void OnZoomChanged(const ZoomController::ZoomChangedEventData& data) {
  17   }
  18
  19  protected:
  20   virtual ~ZoomObserver() {}
  21 };
  22
  23 }  // namespace ui_zoom
  24
  25 #endif  // COMPONENTS_UI_ZOOM_ZOOM_OBSERVER_H_