1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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_QUICK_PRIVATE_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)
QML_NAMED_ELEMENT(TapHandler)
QML_ADDED_IN_VERSION(2, 12)
public:
enum GesturePolicy {
DragThreshold,
WithinBounds,
ReleaseWithinBounds,
DragWithinBounds
};
Q_ENUM(GesturePolicy)
explicit QQuickTapHandler(QQuickItem *parent = nullptr);
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();
// the second argument (Qt::MouseButton) was added in 6.2: avoid name clashes with IDs by not naming it for now
void tapped(QEventPoint eventPoint, Qt::MouseButton /* button */);
void singleTapped(QEventPoint eventPoint, Qt::MouseButton /* button */);
void doubleTapped(QEventPoint eventPoint, Qt::MouseButton /* button */);
void longPressed();
protected:
void onGrabChanged(QQuickPointerHandler *grabber, QPointingDevice::GrabTransition transition,
QPointerEvent *ev, QEventPoint &point) override;
void timerEvent(QTimerEvent *event) override;
bool wantsEventPoint(const QPointerEvent *event, const QEventPoint &point) override;
void handleEventPoint(QPointerEvent *event, QEventPoint &point) override;
private:
void setPressed(bool press, bool cancel, QPointerEvent *event, QEventPoint &point);
int longPressThresholdMilliseconds() const;
void connectPreRenderSignal(bool conn = true);
void updateTimeHeld();
private:
QPointF m_lastTapPos;
qreal m_lastTapTimestamp = 0;
QElapsedTimer m_holdTimer;
QBasicTimer m_longPressTimer;
int m_tapCount = 0;
int m_longPressThreshold = -1;
GesturePolicy m_gesturePolicy = GesturePolicy::DragThreshold;
bool m_pressed = false;
static qreal m_multiTapInterval;
static int m_mouseMultiClickDistanceSquared;
static int m_touchMultiTapDistanceSquared;
};
QT_END_NAMESPACE
QML_DECLARE_TYPE(QQuickTapHandler)
#endif // QQUICKTAPHANDLER_H
|
