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// 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_TAP_SUPPRESSION_CONTROLLER_H_
#define CONTENT_BROWSER_RENDERER_HOST_INPUT_TAP_SUPPRESSION_CONTROLLER_H_
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "content/common/content_export.h"
namespace content {
class TapSuppressionControllerClient;
// The core controller for suppression of taps (touchpad or touchscreen)
// immediately following a GestureFlingCancel event (caused by the same tap).
// Only taps of sufficient speed and within a specified time window after a
// GestureFlingCancel are suppressed.
class CONTENT_EXPORT TapSuppressionController {
public:
explicit TapSuppressionController(TapSuppressionControllerClient* client);
virtual ~TapSuppressionController();
// Should be called whenever a GestureFlingCancel event is received.
void GestureFlingCancel();
// Should be called whenever an ACK for a GestureFlingCancel event is
// received. |processed| is true when the GestureFlingCancel actually stopped
// a fling and therefore should suppress the forwarding of the following tap.
void GestureFlingCancelAck(bool processed);
// Should be called whenever a tap down (touchpad or touchscreen) is received.
// Returns true if the tap down should be deferred. The caller is responsible
// for keeping the event for later release, if needed.
bool ShouldDeferTapDown();
// Should be called whenever a tap ending event is received. Returns true if
// the tap event should be suppressed.
bool ShouldSuppressTapEnd();
protected:
virtual base::TimeTicks Now();
virtual void StartTapDownTimer(const base::TimeDelta& delay);
virtual void StopTapDownTimer();
void TapDownTimerExpired();
private:
friend class MockTapSuppressionController;
enum State {
NOTHING,
GFC_IN_PROGRESS,
TAP_DOWN_STASHED,
LAST_CANCEL_STOPPED_FLING,
};
TapSuppressionControllerClient* client_;
base::OneShotTimer<TapSuppressionController> tap_down_timer_;
State state_;
// TODO(rjkroege): During debugging, the event times did not prove reliable.
// Replace the use of base::TimeTicks with an accurate event time when they
// become available post http://crbug.com/119556.
base::TimeTicks fling_cancel_time_;
DISALLOW_COPY_AND_ASSIGN(TapSuppressionController);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_TAP_SUPPRESSION_CONTROLLER_H_
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