1 // Copyright 2014 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 UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_ 6 #define UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_ 7 8 #include "ui/events/events_export.h" 9 #include "ui/events/platform/platform_event_types.h" 10 11 namespace ui { 12 13 // PlatformEventObserver can be installed on a PlatformEventSource, and it 14 // receives all events that are dispatched to the dispatchers. 15 class EVENTS_EXPORT PlatformEventObserver { 16 public: 17 // This is called before the dispatcher receives the event. 18 virtual void WillProcessEvent(const PlatformEvent& event) = 0; 19 20 // This is called after the event has been dispatched to the dispatcher(s). 21 virtual void DidProcessEvent(const PlatformEvent& event) = 0; 22 23 protected: 24 virtual ~PlatformEventObserver() {} 25 }; 26 27 } // namespace ui 28 29 #endif // UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_ 30
