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      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 CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_
      6 #define CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_
      7 
      8 #include "chrome/browser/ui/zoom/zoom_controller.h"
      9 
     10 namespace content {
     11 class WebContents;
     12 }
     13 
     14 // Interface for objects that wish to be notified of changes in ZoomController.
     15 class ZoomObserver {
     16  public:
     17   // Notification that the zoom percentage has changed.
     18   virtual void OnZoomChanged(const ZoomController::ZoomChangedEventData& data) {
     19   }
     20 
     21  protected:
     22   virtual ~ZoomObserver() {}
     23 };
     24 
     25 #endif  // CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_
     26