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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QQUICKTAPHANDLER_H
#define QQUICKTAPHANDLER_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qquickitem.h"
#include "qevent.h"
#include "qquicksinglepointhandler_p.h"
#include <QtCore/qbasictimer.h>
QT_BEGIN_NAMESPACE
class Q_AUTOTEST_EXPORT QQuickTapHandler : public QQuickSinglePointHandler
{
Q_OBJECT
Q_PROPERTY(bool pressed READ isPressed NOTIFY pressedChanged)
Q_PROPERTY(int tapCount READ tapCount NOTIFY tapCountChanged)
Q_PROPERTY(qreal timeHeld READ timeHeld NOTIFY timeHeldChanged)
Q_PROPERTY(qreal longPressThreshold READ longPressThreshold WRITE setLongPressThreshold NOTIFY longPressThresholdChanged)
Q_PROPERTY(GesturePolicy gesturePolicy READ gesturePolicy WRITE setGesturePolicy NOTIFY gesturePolicyChanged)
public:
enum GesturePolicy {
DragThreshold,
WithinBounds,
ReleaseWithinBounds
};
Q_ENUM(GesturePolicy)
explicit QQuickTapHandler(QObject *parent = 0);
~QQuickTapHandler();
bool isPressed() const { return m_pressed; }
int tapCount() const { return m_tapCount; }
qreal timeHeld() const { return (m_holdTimer.isValid() ? m_holdTimer.elapsed() / 1000.0 : -1.0); }
qreal longPressThreshold() const;
void setLongPressThreshold(qreal longPressThreshold);
GesturePolicy gesturePolicy() const { return m_gesturePolicy; }
void setGesturePolicy(GesturePolicy gesturePolicy);
Q_SIGNALS:
void pressedChanged();
void tapCountChanged();
void timeHeldChanged();
void longPressThresholdChanged();
void gesturePolicyChanged();
void tapped();
void longPressed();
protected:
void onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabState stateChange, QQuickEventPoint *point) override;
void timerEvent(QTimerEvent *event) override;
bool wantsEventPoint(QQuickEventPoint *point) override;
void handleEventPoint(QQuickEventPoint *point) override;
private:
void setPressed(bool press, bool cancel, QQuickEventPoint *point);
int longPressThresholdMilliseconds() const;
void connectPreRenderSignal(bool conn = true);
void updateTimeHeld();
private:
bool m_pressed;
GesturePolicy m_gesturePolicy;
int m_tapCount;
int m_longPressThreshold;
QBasicTimer m_longPressTimer;
QElapsedTimer m_holdTimer;
QPointF m_lastTapPos;
qreal m_lastTapTimestamp;
static qreal m_multiTapInterval;
static int m_mouseMultiClickDistanceSquared;
static int m_touchMultiTapDistanceSquared;
};
QT_END_NAMESPACE
QML_DECLARE_TYPE(QQuickTapHandler)
#endif // QQUICKTAPHANDLER_H
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