ui/events/event_processor.h

// Copyright 2013 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_EVENT_PROCESSOR_H_
#define UI_EVENTS_EVENT_PROCESSOR_H_

#include "ui/events/event_dispatcher.h"
#include "ui/events/event_source.h"

namespace ui {

// EventProcessor receives an event from an EventSource and dispatches it to a
// tree of EventTargets.
class EVENTS_EXPORT EventProcessor : public EventDispatcherDelegate {
 public:
  virtual ~EventProcessor() {}

  // Returns the root of the tree this event processor owns.
  virtual EventTarget* GetRootTarget() = 0;

  // Dispatches an event received from the EventSource to the tree of
  // EventTargets (whose root is returned by GetRootTarget()).
  virtual EventDispatchDetails OnEventFromSource(Event* event)
      WARN_UNUSED_RESULT;
};

}  // namespace ui

#endif  // UI_EVENTS_EVENT_PROCESSOR_H_