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39
40#ifndef QQUICKPINCHHANDLER_H
41#define QQUICKPINCHHANDLER_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include "qquickitem.h"
55#include "qevent.h"
56#include "qquickmultipointhandler_p.h"
57#include <private/qquicktranslate_p.h>
58#include "qquickdragaxis_p.h"
59
60QT_BEGIN_NAMESPACE
61
62class Q_QUICK_PRIVATE_EXPORT QQuickPinchHandler : public QQuickMultiPointHandler
63{
64 Q_OBJECT
65 Q_PROPERTY(qreal minimumScale READ minimumScale WRITE setMinimumScale NOTIFY minimumScaleChanged)
66 Q_PROPERTY(qreal maximumScale READ maximumScale WRITE setMaximumScale NOTIFY maximumScaleChanged)
67 Q_PROPERTY(qreal minimumRotation READ minimumRotation WRITE setMinimumRotation NOTIFY minimumRotationChanged)
68 Q_PROPERTY(qreal maximumRotation READ maximumRotation WRITE setMaximumRotation NOTIFY maximumRotationChanged)
69 Q_PROPERTY(qreal scale READ scale NOTIFY updated)
70 Q_PROPERTY(qreal activeScale READ activeScale NOTIFY updated)
71 Q_PROPERTY(qreal rotation READ rotation NOTIFY updated)
72 Q_PROPERTY(QVector2D translation READ translation NOTIFY updated)
73#if QT_DEPRECATED_SINCE(5, 12)
74 Q_PROPERTY(qreal minimumX READ minimumX WRITE setMinimumX NOTIFY minimumXChanged) // ### Qt 6: remove
75 Q_PROPERTY(qreal maximumX READ maximumX WRITE setMaximumX NOTIFY maximumXChanged) // ### Qt 6: remove
76 Q_PROPERTY(qreal minimumY READ minimumY WRITE setMinimumY NOTIFY minimumYChanged) // ### Qt 6: remove
77 Q_PROPERTY(qreal maximumY READ maximumY WRITE setMaximumY NOTIFY maximumYChanged) // ### Qt 6: remove
78#endif
79 Q_PROPERTY(QQuickDragAxis * xAxis READ xAxis CONSTANT)
80 Q_PROPERTY(QQuickDragAxis * yAxis READ yAxis CONSTANT)
81 QML_NAMED_ELEMENT(PinchHandler)
82 QML_ADDED_IN_MINOR_VERSION(12)
83
84public:
85 explicit QQuickPinchHandler(QQuickItem *parent = nullptr);
86
87 qreal minimumScale() const { return m_minimumScale; }
88 void setMinimumScale(qreal minimumScale);
89
90 qreal maximumScale() const { return m_maximumScale; }
91 void setMaximumScale(qreal maximumScale);
92
93 qreal minimumRotation() const { return m_minimumRotation; }
94 void setMinimumRotation(qreal minimumRotation);
95
96 qreal maximumRotation() const { return m_maximumRotation; }
97 void setMaximumRotation(qreal maximumRotation);
98
99 QVector2D translation() const { return m_activeTranslation; }
100 qreal scale() const { return m_accumulatedScale; }
101 qreal activeScale() const { return m_activeScale; }
102 qreal rotation() const { return m_activeRotation; }
103
104#if QT_DEPRECATED_SINCE(5, 12)
105 void warnAboutMinMaxDeprecated() const;
106 qreal minimumX() const { warnAboutMinMaxDeprecated(); return m_minimumX; }
107 void setMinimumX(qreal minX);
108 qreal maximumX() const { warnAboutMinMaxDeprecated(); return m_maximumX; }
109 void setMaximumX(qreal maxX);
110 qreal minimumY() const { warnAboutMinMaxDeprecated(); return m_minimumY; }
111 void setMinimumY(qreal minY);
112 qreal maximumY() const { warnAboutMinMaxDeprecated(); return m_maximumY; }
113 void setMaximumY(qreal maxY);
114#endif
115
116 QQuickDragAxis *xAxis() { return &m_xAxis; }
117 QQuickDragAxis *yAxis() { return &m_yAxis; }
118
119signals:
120 void minimumScaleChanged();
121 void maximumScaleChanged();
122 void minimumRotationChanged();
123 void maximumRotationChanged();
124 void minimumXChanged();
125 void maximumXChanged();
126 void minimumYChanged();
127 void maximumYChanged();
128 void updated();
129
130protected:
131 bool wantsPointerEvent(QQuickPointerEvent *event) override;
132 void onActiveChanged() override;
133 void handlePointerEventImpl(QQuickPointerEvent *event) override;
134
135private:
136 // properties
137 qreal m_activeScale = 1;
138 qreal m_accumulatedScale = 1;
139 qreal m_activeRotation = 0;
140 QVector2D m_activeTranslation = QVector2D(0, 0);
141
142 qreal m_minimumScale = -qInf();
143 qreal m_maximumScale = qInf();
144
145 qreal m_minimumRotation = -qInf();
146 qreal m_maximumRotation = qInf();
147
148 qreal m_minimumX = -qInf();
149 qreal m_maximumX = qInf();
150 qreal m_minimumY = -qInf();
151 qreal m_maximumY = qInf();
152 QQuickDragAxis m_xAxis;
153 QQuickDragAxis m_yAxis;
154
155 // internal
156 qreal m_startScale = 1;
157 qreal m_startRotation = 0;
158 qreal m_startDistance = 0;
159 QPointF m_startPos;
160 qreal m_accumulatedStartCentroidDistance = 0;
161 QVector<PointData> m_startAngles;
162 QQuickMatrix4x4 m_transform;
163};
164
165QT_END_NAMESPACE
166
167QML_DECLARE_TYPE(QQuickPinchHandler)
168
169#endif // QQUICKPINCHHANDLER_H
170

source code of qtdeclarative/src/quick/handlers/qquickpinchhandler_p.h