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// Copyright (c) 2012 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 CONTENT_BROWSER_RENDERER_HOST_TOUCH_EVENT_QUEUE_H_
#define CONTENT_BROWSER_RENDERER_HOST_TOUCH_EVENT_QUEUE_H_
#include <deque>
#include "base/basictypes.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
class MockRenderWidgetHost;
namespace content {
class RenderWidgetHostImpl;
// A queue for throttling and coalescing touch-events.
class TouchEventQueue {
public:
explicit TouchEventQueue(RenderWidgetHostImpl* host);
virtual ~TouchEventQueue();
// Adds an event to the queue. The event may be coalesced with previously
// queued events (e.g. consecutive touch-move events can be coalesced into a
// single touch-move event). The event may also be immediately forwarded to
// the renderer (e.g. when there are no other queued touch event).
void QueueEvent(const WebKit::WebTouchEvent& event);
// Notifies the queue that a touch-event has been processed by the renderer.
// At this point, the queue may send one or more gesture events and/or
// additional queued touch-events to the renderer.
void ProcessTouchAck(bool processed);
// Empties the queue of touch events. This may result in any number of gesture
// events being sent to the renderer.
void FlushQueue();
// Resets all internal state. This does not trigger any touch or gesture
// events to be sent.
void Reset();
// Returns whether the event-queue is empty.
bool empty() const WARN_UNUSED_RESULT {
return touch_queue_.empty();
}
private:
friend class ::MockRenderWidgetHost;
// Pops the touch-event from the top of the queue and sends it to the
// RenderWidgetHostView. This reduces the size of the queue by one.
void PopTouchEventToView(bool processed);
// The RenderWidgetHost that owns this event-queue.
RenderWidgetHostImpl* render_widget_host_;
typedef std::deque<WebKit::WebTouchEvent> TouchQueue;
TouchQueue touch_queue_;
DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_TOUCH_EVENT_QUEUE_H_
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