diff options
Diffstat (limited to 'src/gui/kernel')
| -rw-r--r-- | src/gui/kernel/qevent.cpp | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/gui/kernel/qevent.cpp b/src/gui/kernel/qevent.cpp index 543f5453ff..c3a6be692b 100644 --- a/src/gui/kernel/qevent.cpp +++ b/src/gui/kernel/qevent.cpp @@ -3305,15 +3305,21 @@ QWindowStateChangeEvent::~QWindowStateChangeEvent() \section1 Event Handling - All touch events are of type QEvent::TouchBegin, QEvent::TouchUpdate, or QEvent::TouchEnd. - Reimplement QWidget::event() or QAbstractScrollArea::viewportEvent() for widgets and - QGraphicsItem::sceneEvent() for items in a graphics view to receive touch events. + All touch events are of type QEvent::TouchBegin, QEvent::TouchUpdate, QEvent::TouchEnd or + QEvent::TouchCancel. Reimplement QWidget::event() or QAbstractScrollArea::viewportEvent() for + widgets and QGraphicsItem::sceneEvent() for items in a graphics view to receive touch events. The QEvent::TouchUpdate and QEvent::TouchEnd events are sent to the widget or item that accepted the QEvent::TouchBegin event. If the QEvent::TouchBegin event is not accepted and not filtered by an event filter, then no further touch events are sent until the next QEvent::TouchBegin. + Some systems may send an event of type QEvent::TouchCancel. Upon receiving this event + applications are requested to ignore the entire active touch sequence. For example in a + composited system the compositor may decide to treat certain gestures as system-wide + gestures. Whenever such a decision is made (the gesture is recognized), the clients will be + notified with a QEvent::TouchCancel event so they can update their state accordingly. + The touchPoints() function returns a list of all touch points contained in the event. Information about each touch point can be retrieved using the QTouchEvent::TouchPoint class. The Qt::TouchPointState enum describes the different states that a touch point may have. |