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39
40#ifndef QGESTUREMANAGER_P_H
41#define QGESTUREMANAGER_P_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 for the convenience
48// of other Qt classes. 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 <QtWidgets/private/qtwidgetsglobal_p.h>
55#include "qobject.h"
56#include "qbasictimer.h"
57#include "private/qwidget_p.h"
58#include "qgesturerecognizer.h"
59
60#ifndef QT_NO_GESTURES
61
62#include <functional>
63
64QT_BEGIN_NAMESPACE
65
66class QBasicTimer;
67class QGraphicsObject;
68class QGestureManager : public QObject
69{
70 Q_OBJECT
71public:
72 QGestureManager(QObject *parent);
73 ~QGestureManager();
74
75 Qt::GestureType registerGestureRecognizer(QGestureRecognizer *recognizer);
76 void unregisterGestureRecognizer(Qt::GestureType type);
77
78 bool filterEvent(QWidget *receiver, QEvent *event);
79 bool filterEvent(QObject *receiver, QEvent *event);
80#if QT_CONFIG(graphicsview)
81 bool filterEvent(QGraphicsObject *receiver, QEvent *event);
82#endif // QT_CONFIG(graphicsview)
83
84 enum InstanceCreation { ForceCreation, DontForceCreation };
85
86 static QGestureManager *instance(InstanceCreation ic = ForceCreation); // declared in qapplication.cpp
87 static bool gesturePending(QObject *o);
88
89 void cleanupCachedGestures(QObject *target, Qt::GestureType type);
90
91 void recycle(QGesture *gesture);
92
93protected:
94 bool filterEventThroughContexts(const QMultiMap<QObject *, Qt::GestureType> &contexts,
95 QEvent *event);
96
97private:
98 QMultiMap<Qt::GestureType, QGestureRecognizer *> m_recognizers;
99
100 QSet<QGesture *> m_activeGestures;
101 QSet<QGesture *> m_maybeGestures;
102
103 enum State {
104 Gesture,
105 NotGesture,
106 MaybeGesture // this means timers are up and waiting for some
107 // more events, and input events are handled by
108 // gesture recognizer explicitly
109 } state;
110
111 struct ObjectGesture
112 {
113 QObject* object;
114 Qt::GestureType gesture;
115
116 ObjectGesture(QObject *o, const Qt::GestureType &g) : object(o), gesture(g) { }
117 inline bool operator<(const ObjectGesture &rhs) const
118 {
119 if (std::less<QObject *>{}(object, rhs.object))
120 return true;
121 if (object == rhs.object)
122 return gesture < rhs.gesture;
123 return false;
124 }
125 };
126
127 QMap<ObjectGesture, QList<QGesture *> > m_objectGestures;
128 QHash<QGesture *, QGestureRecognizer *> m_gestureToRecognizer;
129 QHash<QGesture *, QObject *> m_gestureOwners;
130
131 QHash<QGesture *, QPointer<QWidget> > m_gestureTargets;
132
133 int m_lastCustomGestureId;
134
135 QHash<QGestureRecognizer *, QSet<QGesture *> > m_obsoleteGestures;
136 QHash<QGesture *, QGestureRecognizer *> m_deletedRecognizers;
137 QSet<QGesture *> m_gesturesToDelete;
138 void cleanupGesturesForRemovedRecognizer(QGesture *gesture);
139
140 QGesture *getState(QObject *widget, QGestureRecognizer *recognizer,
141 Qt::GestureType gesture);
142 void deliverEvents(const QSet<QGesture *> &gestures,
143 QSet<QGesture *> *undeliveredGestures);
144 void getGestureTargets(const QSet<QGesture*> &gestures,
145 QHash<QWidget *, QList<QGesture *> > *conflicts,
146 QHash<QWidget *, QList<QGesture *> > *normal);
147
148 void cancelGesturesForChildren(QGesture *originatingGesture);
149};
150
151QT_END_NAMESPACE
152
153#endif // QT_NO_GESTURES
154
155#endif // QGESTUREMANAGER_P_H
156

source code of qtbase/src/widgets/kernel/qgesturemanager_p.h