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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_GESTURE_EVENT_FILTER_H_
#define CONTENT_BROWSER_RENDERER_HOST_GESTURE_EVENT_FILTER_H_
#include <deque>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
class MockRenderWidgetHost;
namespace content {
class RenderWidgetHostImpl;
class TapSuppressionController;
// Manages a queue of in-progress |WebGestureEvent| instances filtering,
// coalescing or discarding them as required to maximize the chance that
// the event stream can be handled entirely by the compositor thread.
class GestureEventFilter {
public:
explicit GestureEventFilter(RenderWidgetHostImpl*);
~GestureEventFilter();
// Returns |true| if the caller should immediately forward the provided
// |WebGestureEvent| argument to the renderer.
bool ShouldForward(const WebKit::WebGestureEvent&);
// Indicate that calling RenderWidgetHostImpl has received an acknowledgement
// from the renderer with state |processed| and event |type|. May send events
// if the queue is not empty.
void ProcessGestureAck(bool processed, int type);
// Reset the state of the filter as would be needed when the Renderer exits.
void Reset();
// Set the state of the |fling_in_progress_| field to indicate that a fling is
// definitely not in progress.
void FlingHasBeenHalted();
// Return the |TapSuppressionController| instance.
TapSuppressionController* GetTapSuppressionController();
private:
friend class ::MockRenderWidgetHost;
// Returns |true| if the given GestureFlingCancel should be discarded
// as unnecessary.
bool ShouldDiscardFlingCancelEvent(
const WebKit::WebGestureEvent& gesture_event);
// Only a RenderWidgetHostViewImpl can own an instance.
RenderWidgetHostImpl* render_widget_host_;
// True if a GestureFlingStart is in progress on the renderer.
bool fling_in_progress_;
// (Similar to |mouse_wheel_pending_|.). True if gesture event was sent and
// we are waiting for a corresponding ack.
bool gesture_event_pending_;
// An object tracking the state of touchpad action on the delivery of mouse
// events to the renderer to filter mouse actiosn immediately after a touchpad
// fling canceling tap.
scoped_ptr<TapSuppressionController> tap_suppression_controller_;
typedef std::deque<WebKit::WebGestureEvent> GestureEventQueue;
// (Similar to |coalesced_mouse_wheel_events_|.) GestureScrollUpdate events
// are coalesced by merging deltas in a similar fashion as wheel events.
GestureEventQueue coalesced_gesture_events_;
DISALLOW_COPY_AND_ASSIGN(GestureEventFilter);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_GESTURE_EVENT_FILTER_H_
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