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// Copyright (c) 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 CONTENT_BROWSER_RENDERER_HOST_TOUCHSCREEN_TAP_SUPPRESSION_CONTROLLER_H_
#define CONTENT_BROWSER_RENDERER_HOST_TOUCHSCREEN_TAP_SUPPRESSION_CONTROLLER_H_
#include "base/memory/scoped_ptr.h"
#include "content/browser/renderer_host/gesture_event_filter.h"
#include "content/browser/renderer_host/tap_suppression_controller_client.h"
namespace content {
class GestureEventFilter;
class TapSuppressionController;
// Controls the suppression of touchscreen taps immediately following the
// dispatch of a GestureFlingCancel event.
class TouchscreenTapSuppressionController
: public TapSuppressionControllerClient {
public:
explicit TouchscreenTapSuppressionController(GestureEventFilter* gef);
virtual ~TouchscreenTapSuppressionController();
// Should be called on arrival of GestureFlingCancel events.
void GestureFlingCancel();
// Should be called on arrival of ACK for a GestureFlingCancel event.
// |processed| is true if the GestureFlingCancel successfully stopped a fling.
void GestureFlingCancelAck(bool processed);
// Should be called on arrival of GestureTapDown events. Returns true if the
// caller should stop normal handling of the GestureTapDown. In this case, the
// caller is responsible for saving the event for later use, if needed.
bool ShouldDeferGestureTapDown(const GestureEventWithLatencyInfo& event);
// Should be called on arrival of GestureTap events. Returns true if the
// caller should stop normal handling of the GestureTap.
bool ShouldSuppressGestureTap();
// Should be called on arrival of GestureTapCancel events. Returns true if the
// caller should stop normal handling of the GestureTapCancel.
bool ShouldSuppressGestureTapCancel();
private:
// TapSuppressionControllerClient implementation.
virtual int MaxCancelToDownTimeInMs() OVERRIDE;
virtual int MaxTapGapTimeInMs() OVERRIDE;
virtual void DropStashedTapDown() OVERRIDE;
virtual void ForwardStashedTapDownForDeferral() OVERRIDE;
virtual void ForwardStashedTapDownSkipDeferral() OVERRIDE;
GestureEventFilter* gesture_event_filter_;
GestureEventWithLatencyInfo stashed_tap_down_;
// The core controller of tap suppression.
scoped_ptr<TapSuppressionController> controller_;
DISALLOW_COPY_AND_ASSIGN(TouchscreenTapSuppressionController);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_TOUCHSCREEN_TAP_SUPPRESSION_CONTROLLER_H_
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