| // Copyright 2012 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_ZOOM_ZOOM_OBSERVER_H_ |
| #define COMPONENTS_ZOOM_ZOOM_OBSERVER_H_ |
| |
| #include "components/zoom/zoom_controller.h" |
| |
| namespace zoom { |
| |
| // Interface for objects that wish to be notified of changes in ZoomController. |
| class ZoomObserver : public base::CheckedObserver { |
| public: |
| // Fired when the ZoomController is destructed. Observers should deregister |
| // themselves from the ZoomObserver in this event handler. Note that |
| // ZoomController::FromWebContents() returns nullptr at this point already. |
| virtual void OnZoomControllerDestroyed( |
| zoom::ZoomController* zoom_controller) = 0; |
| |
| // Notification that the zoom percentage has changed. |
| virtual void OnZoomChanged(const ZoomController::ZoomChangedEventData& data) { |
| } |
| }; |
| |
| } // namespace zoom |
| |
| #endif // COMPONENTS_ZOOM_ZOOM_OBSERVER_H_ |
