| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_ |
| #define UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_ |
| |
| #include "ui/events/events_export.h" |
| #include "ui/events/platform_event.h" |
| |
| namespace ui { |
| |
| // PlatformEventObserver can be installed on a PlatformEventSource, and it |
| // receives all events that are dispatched to the dispatchers. |
| class EVENTS_EXPORT PlatformEventObserver { |
| public: |
| // This is called before the dispatcher receives the event. |
| virtual void WillProcessEvent(const PlatformEvent& event) = 0; |
| |
| // This is called after the event has been dispatched to the dispatcher(s). |
| virtual void DidProcessEvent(const PlatformEvent& event) = 0; |
| |
| protected: |
| virtual ~PlatformEventObserver() {} |
| }; |
| |
| } // namespace ui |
| |
| #endif // UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_ |