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
|
// Copyright (C) 2018 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 QQUICKDRAGHANDLER_H
#define QQUICKDRAGHANDLER_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 "qquickmultipointhandler_p.h"
#include "qquickdragaxis_p.h"
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
class Q_QUICK_EXPORT QQuickDragHandler : public QQuickMultiPointHandler
{
Q_OBJECT
Q_PROPERTY(QQuickDragAxis * xAxis READ xAxis CONSTANT)
Q_PROPERTY(QQuickDragAxis * yAxis READ yAxis CONSTANT)
#if QT_DEPRECATED_SINCE(6, 2)
Q_PROPERTY(QVector2D translation READ translation NOTIFY translationChanged)
#endif
Q_PROPERTY(QVector2D activeTranslation READ activeTranslation NOTIFY translationChanged REVISION(6, 2))
Q_PROPERTY(QVector2D persistentTranslation READ persistentTranslation WRITE setPersistentTranslation NOTIFY translationChanged REVISION(6, 2))
Q_PROPERTY(SnapMode snapMode READ snapMode WRITE setSnapMode NOTIFY snapModeChanged REVISION(2, 14))
QML_NAMED_ELEMENT(DragHandler)
QML_ADDED_IN_VERSION(2, 12)
public:
enum SnapMode {
NoSnap = 0,
SnapAuto,
SnapIfPressedOutsideTarget,
SnapAlways
};
Q_ENUM(SnapMode)
explicit QQuickDragHandler(QQuickItem *parent = nullptr);
void handlePointerEventImpl(QPointerEvent *event) override;
QQuickDragAxis *xAxis() { return &m_xAxis; }
QQuickDragAxis *yAxis() { return &m_yAxis; }
#if QT_DEPRECATED_SINCE(6, 2)
QVector2D translation() const { return activeTranslation(); }
#endif
QVector2D activeTranslation() const { return QVector2D(QPointF(m_xAxis.activeValue(), m_yAxis.activeValue())); }
void setActiveTranslation(const QVector2D &trans);
QVector2D persistentTranslation() const { return QVector2D(QPointF(m_xAxis.persistentValue(), m_yAxis.persistentValue())); }
void setPersistentTranslation(const QVector2D &trans);
QQuickDragHandler::SnapMode snapMode() const;
void setSnapMode(QQuickDragHandler::SnapMode mode);
Q_SIGNALS:
void translationChanged(QVector2D delta);
Q_REVISION(2, 14) void snapModeChanged();
protected:
bool wantsPointerEvent(QPointerEvent *event) override;
void onActiveChanged() override;
void onGrabChanged(QQuickPointerHandler *grabber, QPointingDevice::GrabTransition transition, QPointerEvent *event, QEventPoint &point) override;
private:
void ungrab();
void enforceAxisConstraints(QPointF *localPos);
QPointF targetCentroidPosition();
private:
QPointF m_pressTargetPos; // We must also store the local targetPos, because we cannot deduce
// the press target pos from the scene pos in case there was e.g a
// flick in one of the ancestors during the drag.
QQuickDragAxis m_xAxis = {this, u"x"_s};
QQuickDragAxis m_yAxis = {this, u"y"_s};
QQuickDragHandler::SnapMode m_snapMode = SnapAuto;
bool m_pressedInsideTarget = false;
friend class QQuickDragAxis;
};
QT_END_NAMESPACE
#endif // QQUICKDRAGHANDLER_H
|
