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// 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/platform_event_types.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_
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