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39
40#ifndef QSCROLLER_H
41#define QSCROLLER_H
42
43#include <QtWidgets/qtwidgetsglobal.h>
44#include <QtCore/QObject>
45#include <QtCore/QPointF>
46#include <QtWidgets/QScrollerProperties>
47
48QT_REQUIRE_CONFIG(scroller);
49
50QT_BEGIN_NAMESPACE
51
52
53class QWidget;
54class QScrollerPrivate;
55class QScrollerProperties;
56#ifndef QT_NO_GESTURES
57class QFlickGestureRecognizer;
58class QMouseFlickGestureRecognizer;
59#endif
60
61class Q_WIDGETS_EXPORT QScroller : public QObject
62{
63 Q_OBJECT
64 Q_PROPERTY(State state READ state NOTIFY stateChanged)
65 Q_PROPERTY(QScrollerProperties scrollerProperties READ scrollerProperties WRITE setScrollerProperties NOTIFY scrollerPropertiesChanged)
66
67public:
68 enum State
69 {
70 Inactive,
71 Pressed,
72 Dragging,
73 Scrolling
74 };
75 Q_ENUM(State)
76
77 enum ScrollerGestureType
78 {
79 TouchGesture,
80 LeftMouseButtonGesture,
81 RightMouseButtonGesture,
82 MiddleMouseButtonGesture
83 };
84
85 enum Input
86 {
87 InputPress = 1,
88 InputMove,
89 InputRelease
90 };
91
92 static bool hasScroller(QObject *target);
93
94 static QScroller *scroller(QObject *target);
95 static const QScroller *scroller(const QObject *target);
96
97#ifndef QT_NO_GESTURES
98 static Qt::GestureType grabGesture(QObject *target, ScrollerGestureType gestureType = TouchGesture);
99 static Qt::GestureType grabbedGesture(QObject *target);
100 static void ungrabGesture(QObject *target);
101#endif
102
103 static QList<QScroller *> activeScrollers();
104
105 QObject *target() const;
106
107 State state() const;
108
109 bool handleInput(Input input, const QPointF &position, qint64 timestamp = 0);
110
111 void stop();
112 QPointF velocity() const;
113 QPointF finalPosition() const;
114 QPointF pixelPerMeter() const;
115
116 QScrollerProperties scrollerProperties() const;
117
118 void setSnapPositionsX( const QList<qreal> &positions );
119 void setSnapPositionsX( qreal first, qreal interval );
120 void setSnapPositionsY( const QList<qreal> &positions );
121 void setSnapPositionsY( qreal first, qreal interval );
122
123public Q_SLOTS:
124 void setScrollerProperties(const QScrollerProperties &prop);
125 void scrollTo(const QPointF &pos);
126 void scrollTo(const QPointF &pos, int scrollTime);
127 void ensureVisible(const QRectF &rect, qreal xmargin, qreal ymargin);
128 void ensureVisible(const QRectF &rect, qreal xmargin, qreal ymargin, int scrollTime);
129 void resendPrepareEvent();
130
131Q_SIGNALS:
132 void stateChanged(QScroller::State newstate);
133 void scrollerPropertiesChanged(const QScrollerProperties &);
134
135private:
136 QScrollerPrivate *d_ptr;
137
138 QScroller(QObject *target);
139 virtual ~QScroller();
140
141 Q_DISABLE_COPY(QScroller)
142 Q_DECLARE_PRIVATE(QScroller)
143
144#ifndef QT_NO_GESTURES
145 friend class QFlickGestureRecognizer;
146#endif
147};
148
149QT_END_NAMESPACE
150
151#endif // QSCROLLER_H
152

source code of qtbase/src/widgets/util/qscroller.h