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Qt 4.8
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Qt 4.8
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The QGesture class represents a gesture, containing properties that describe the corresponding user input. More...
#include <qgesture.h>
Public Types | |
| enum | GestureCancelPolicy { CancelNone = 0, CancelAllInContext } |
| This enum describes how accepting a gesture can cancel other gestures automatically. More... | |
Public Functions | |
| GestureCancelPolicy | gestureCancelPolicy () const |
| Qt::GestureType | gestureType () const |
| bool | hasHotSpot () const |
| QPointF | hotSpot () const |
| QGesture (QObject *parent=0) | |
| Constructs a new gesture object with the given parent. More... | |
| void | setGestureCancelPolicy (GestureCancelPolicy policy) |
| void | setHotSpot (const QPointF &value) |
| Qt::GestureState | state () const |
| void | unsetHotSpot () |
| ~QGesture () | |
| Destroys the gesture object. More... | |
 Public Functions inherited from QObject | |
| bool | blockSignals (bool b) |
| If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More... | |
| const QObjectList & | children () const |
| Returns a list of child objects. More... | |
| bool | connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const |
| bool | disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0) |
| bool | disconnect (const QObject *receiver, const char *member=0) |
| void | dumpObjectInfo () |
| Dumps information about signal connections, etc. More... | |
| void | dumpObjectTree () |
| Dumps a tree of children to the debug output. More... | |
| QList< QByteArray > | dynamicPropertyNames () const |
| Returns the names of all properties that were dynamically added to the object using setProperty(). More... | |
| virtual bool | event (QEvent *) |
| This virtual function receives events to an object and should return true if the event e was recognized and processed. More... | |
| virtual bool | eventFilter (QObject *, QEvent *) |
| Filters events if this object has been installed as an event filter for the watched object. More... | |
| template<typename T > | |
| T | findChild (const QString &aName=QString()) const |
| Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More... | |
| template<typename T > | |
| QList< T > | findChildren (const QString &aName=QString()) const |
| Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More... | |
| template<typename T > | |
| QList< T > | findChildren (const QRegExp &re) const |
| bool | inherits (const char *classname) const |
| Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More... | |
| void | installEventFilter (QObject *) |
| Installs an event filter filterObj on this object. More... | |
| bool | isWidgetType () const |
| Returns true if the object is a widget; otherwise returns false. More... | |
| void | killTimer (int id) |
| Kills the timer with timer identifier, id. More... | |
| virtual const QMetaObject * | metaObject () const |
| Returns a pointer to the meta-object of this object. More... | |
| void | moveToThread (QThread *thread) |
| Changes the thread affinity for this object and its children. More... | |
| QString | objectName () const |
| QObject * | parent () const |
| Returns a pointer to the parent object. More... | |
| QVariant | property (const char *name) const |
| Returns the value of the object's name property. More... | |
| Q_INVOKABLE | QObject (QObject *parent=0) |
| Constructs an object with parent object parent. More... | |
| void | removeEventFilter (QObject *) |
| Removes an event filter object obj from this object. More... | |
| void | setObjectName (const QString &name) |
| void | setParent (QObject *) |
| Makes the object a child of parent. More... | |
| bool | setProperty (const char *name, const QVariant &value) |
| Sets the value of the object's name property to value. More... | |
| void | setUserData (uint id, QObjectUserData *data) |
| bool | signalsBlocked () const |
| Returns true if signals are blocked; otherwise returns false. More... | |
| int | startTimer (int interval) |
| Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More... | |
| QThread * | thread () const |
| Returns the thread in which the object lives. More... | |
| QObjectUserData * | userData (uint id) const |
| virtual | ~QObject () |
| Destroys the object, deleting all its child objects. More... | |
Protected Functions | |
| QGesture (QGesturePrivate &dd, QObject *parent) | |
| Protected Functions inherited from QObject | |
| virtual void | childEvent (QChildEvent *) |
| This event handler can be reimplemented in a subclass to receive child events. More... | |
| virtual void | connectNotify (const char *signal) |
| This virtual function is called when something has been connected to signal in this object. More... | |
| virtual void | customEvent (QEvent *) |
| This event handler can be reimplemented in a subclass to receive custom events. More... | |
| virtual void | disconnectNotify (const char *signal) |
| This virtual function is called when something has been disconnected from signal in this object. More... | |
| QObject (QObjectPrivate &dd, QObject *parent=0) | |
| int | receivers (const char *signal) const |
| Returns the number of receivers connected to the signal. More... | |
| QObject * | sender () const |
| Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More... | |
| int | senderSignalIndex () const |
| virtual void | timerEvent (QTimerEvent *) |
| This event handler can be reimplemented in a subclass to receive timer events for the object. More... | |
Properties | |
| QGesture::GestureCancelPolicy | gestureCancelPolicy |
| the policy for deciding what happens on accepting a gesture More... | |
| Qt::GestureType | gestureType |
| the type of the gesture More... | |
| bool | hasHotSpot |
| whether the gesture has a hot-spot More... | |
| QPointF | hotSpot |
| The point that is used to find the receiver for the gesture event. More... | |
| Qt::GestureState | state |
| the current state of the gesture More... | |
Friends | |
| class | QGestureEvent |
| class | QGestureManager |
| class | QGestureRecognizer |
| class | QGraphicsScenePrivate |
Additional Inherited Members | |
| Public Slots inherited from QObject | |
| void | deleteLater () |
| Schedules this object for deletion. More... | |
| Signals inherited from QObject | |
| void | destroyed (QObject *=0) |
| This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More... | |
| Static Public Functions inherited from QObject | |
| static bool | connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection) |
| Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More... | |
| static bool | connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection) |
| static bool | disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member) |
| Disconnects signal in object sender from method in object receiver. More... | |
| static bool | disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member) |
| static uint | registerUserData () |
| static QString | tr (const char *sourceText, const char *comment=0, int n=-1) |
| static QString | trUtf8 (const char *sourceText, const char *comment=0, int n=-1) |
| Static Public Variables inherited from QObject | |
| static const QMetaObject | staticMetaObject |
| This variable stores the meta-object for the class. More... | |
| Protected Variables inherited from QObject | |
| QScopedPointer< QObjectData > | d_ptr |
| Static Protected Variables inherited from QObject | |
| static const QMetaObject | staticQtMetaObject |
| Related Functions inherited from QObject | |
| T | qFindChildqFindChildren (const QObject *obj, const QString &name)() |
| QList< T > | qFindChildrenqFindChildren (const QObject *obj, const QString &name)() |
| QList< T > | qFindChildrenqFindChildren (const QObject *obj, const QRegExp ®Exp)() |
| T * | qobject_cast (QObject *object) |
| QObjectList | |
| void * | qt_find_obj_child (QObject *parent, const char *type, const QString &name) |
| Returns a pointer to the object named name that inherits type and with a given parent. More... | |
The QGesture class represents a gesture, containing properties that describe the corresponding user input.
Gesture objects are not constructed directly by developers. They are created by the QGestureRecognizer object that is registered with the application; see QGestureRecognizer::registerRecognizer().
For an overview of gesture handling in Qt and information on using gestures in your applications, see the Gestures Programming document.
The class has a list of properties that can be queried by the user to get some gesture-specific arguments. For example, the pinch gesture has a scale factor that is exposed as a property.
Developers of custom gesture recognizers can add additional properties in order to provide additional information about a gesture. This can be done by adding new dynamic properties to a QGesture object, or by subclassing the QGesture class (or one of its subclasses).
A QGesture instance is implicitly created when needed and is owned by Qt. Developers should never destroy them or store them for later use as Qt may destroy particular instances of them and create new ones to replace them.
The registered gesture recognizer monitors the input events for the target object via its QGestureRecognizer::recognize() function, updating the properties of the gesture object as required.
The gesture object may be delivered to the target object in a QGestureEvent if the corresponding gesture is active or has just been canceled. Each event that is delivered contains a list of gesture objects, since support for more than one gesture may be enabled for the target object. Due to the way events are handled in Qt, gesture events may be filtered by other objects.
Definition at line 64 of file qgesture.h.
This enum describes how accepting a gesture can cancel other gestures automatically.
| Enumerator | |
|---|---|
| CancelNone | |
| CancelAllInContext | |
Definition at line 88 of file qgesture.h.
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explicit |
Constructs a new gesture object with the given parent.
QGesture objects are created by gesture recognizers in the QGestureRecognizer::create() function.
Definition at line 104 of file qgesture.cpp.
| QGesture::~QGesture | ( | ) |
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protected |
Definition at line 113 of file qgesture.cpp.
| GestureCancelPolicy QGesture::gestureCancelPolicy | ( | ) | const |
Referenced by setGestureCancelPolicy().
| Qt::GestureType QGesture::gestureType | ( | ) | const |
Referenced by ~QGesture().
| bool QGesture::hasHotSpot | ( | ) | const |
Referenced by setHotSpot().
| QPointF QGesture::hotSpot | ( | ) | const |
Referenced by ~QGesture().
| void QGesture::setGestureCancelPolicy | ( | GestureCancelPolicy | policy | ) |
Definition at line 226 of file qgesture.cpp.
Referenced by QGestureManager::recycle().
| void QGesture::setHotSpot | ( | const QPointF & | value | ) |
Definition at line 180 of file qgesture.cpp.
Referenced by QPanGestureRecognizer::recognize(), QMacSwipeGestureRecognizer::recognize(), QMacPinchGestureRecognizer::recognize(), QTapGestureRecognizer::recognize(), QTapAndHoldGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().
| Qt::GestureState QGesture::state | ( | ) | const |
| void QGesture::unsetHotSpot | ( | ) |
Definition at line 192 of file qgesture.cpp.
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friend |
Definition at line 100 of file qgesture.h.
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friend |
Definition at line 102 of file qgesture.h.
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friend |
Definition at line 101 of file qgesture.h.
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friend |
Definition at line 103 of file qgesture.h.
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private |
the policy for deciding what happens on accepting a gesture
On accepting one gesture Qt can automatically cancel other gestures that belong to other targets. The policy is normally set to not cancel any other gestures and can be set to cancel all active gestures in the context. For example for all child widgets.
Definition at line 71 of file qgesture.h.
Referenced by QGestureManager::filterEventThroughContexts(), and QGraphicsScenePrivate::gestureEventHandler().
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private |
the type of the gesture
Definition at line 70 of file qgesture.h.
Referenced by QGestureEvent::accept(), QGraphicsScenePrivate::cancelGesturesForChildren(), QGestureManager::deliverEvents(), QGestureManager::filterEvent(), QGestureEvent::gesture(), QGraphicsScenePrivate::gestureEventHandler(), QGraphicsScenePrivate::gestureTargetsAtHotSpots(), QGestureManager::getGestureTargets(), QGestureManager::getState(), QGestureEvent::ignore(), QGestureEvent::isAccepted(), QApplication::notify(), QPanGesture::QPanGesture(), QPinchGesture::QPinchGesture(), QSwipeGesture::QSwipeGesture(), QTapAndHoldGesture::QTapAndHoldGesture(), QTapGesture::QTapGesture(), QGestureManager::registerGestureRecognizer(), and QGestureEvent::setAccepted().
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private |
whether the gesture has a hot-spot
Definition at line 73 of file qgesture.h.
Referenced by QGraphicsScenePrivate::cancelGesturesForChildren(), QGestureManager::deliverEvents(), QGraphicsScenePrivate::gestureEventHandler(), and QGraphicsScenePrivate::gestureTargetsAtHotSpots().
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private |
The point that is used to find the receiver for the gesture event.
The hot-spot is a point in the global coordinate system, use QWidget::mapFromGlobal() or QGestureEvent::mapToGraphicsScene() to get a local hot-spot.
The hot-spot should be set by the gesture recognizer to allow gesture event delivery to a QGraphicsObject.
Definition at line 72 of file qgesture.h.
Referenced by QGestureManager::deliverEvents(), and QGraphicsScenePrivate::gestureEventHandler().
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private |
the current state of the gesture
Definition at line 69 of file qgesture.h.
Referenced by QGestureEvent::activeGestures(), QGestureEvent::canceledGestures(), QGestureManager::deliverEvents(), QGestureManager::filterEventThroughContexts(), QGraphicsScenePrivate::gestureEventHandler(), and QApplication::notify().