1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtWidgets module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 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 64 QT_BEGIN_NAMESPACE 65 66 class QBasicTimer; 67 class QGraphicsObject; 68 class QGestureManager : public QObject 69 { 70 Q_OBJECT 71 public: 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 93 protected: 94 bool filterEventThroughContexts(const QMultiMap<QObject *, Qt::GestureType> &contexts, 95 QEvent *event); 96 97 private: 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 ObjectGestureObjectGesture116 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 }; 150 151 QT_END_NAMESPACE 152 153 #endif // QT_NO_GESTURES 154 155 #endif // QGESTUREMANAGER_P_H 156