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-rw-r--r-- | src/gui/kernel/qpointingdevice.cpp | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/gui/kernel/qpointingdevice.cpp b/src/gui/kernel/qpointingdevice.cpp index cf73dd3ec0..f890fc1ca8 100644 --- a/src/gui/kernel/qpointingdevice.cpp +++ b/src/gui/kernel/qpointingdevice.cpp @@ -111,6 +111,48 @@ Q_LOGGING_CATEGORY(lcPointerGrab, "qt.pointer.grab"); Any of the above (used as a default filter value). */ +/*! \enum QPointingDevice::GrabTransition + + This enum represents a transition of exclusive or passive grab + from one object (possibly \c nullptr) to another (possibly \c nullptr). + It is emitted as an argument of the QPointingDevice::grabChanged() signal. + + Valid values are: + + \value GrabExclusive + Emitted after QPointerEvent::setExclusiveGrabber(). + \value UngrabExclusive + Emitted after QPointerEvent::setExclusiveGrabber() when the grabber is + set to \c nullptr, to notify that the grab has terminated normally. + \value CancelGrabExclusive + Emitted after QPointerEvent::setExclusiveGrabber() when the grabber is set + to a different object, to notify that the old grabber's grab is "stolen". + \value GrabPassive + Emitted after QPointerEvent::addPassiveGrabber(). + \value UngrabPassive + Emitted when a passive grab is terminated normally, + for example after QPointerEvent::removePassiveGrabber(). + \value CancelGrabPassive + Emitted when a passive grab is terminated abnormally (a gesture is canceled). + \value OverrideGrabPassive + This value is not currently used. +*/ + +/*! \fn void QPointingDevice::grabChanged(QObject *grabber, QPointingDevice::GrabTransition transition, const QPointerEvent *event, const QEventPoint &point) const + + This signal is emitted when the \a grabber object gains or loses an + exclusive or passive grab of \a point during delivery of \a event. + The \a transition tells what happened, from the perspective of the + \c grabber object. + + \note A grab transition from one object to another results in two signals, + to notify that one object has lost its grab, and to notify that there is + another grabber. In other cases, when transitioning to or from a non-grabbing + state, only one signal is emitted: the \a grabber argument is never \c nullptr. + + \sa QPointerEvent::setExclusiveGrabber(), QPointerEvent::addPassiveGrabber(), QPointerEvent::removePassiveGrabber() +*/ + /*! Creates a new invalid pointing device instance as a child of \a parent. */ |