The cursor enters a widget during a drag and drop operation ( QDragEnterEvent). The object will be deleted after it has cleaned up (QDeferredDeleteEvent) The margins of the widget's content rect changed. The state of the application has changed.Ī widget child gets polished ( QChildEvent).Ī widget wants to close the software input panel (SIP). The default application palette has changed. The default application layout direction has changed. The default application font has changed.
See also QObject::event(), QObject::installEventFilter(), QCoreApplication::sendEvent(), QCoreApplication::postEvent(), and QCoreApplication::processEvents().Ī new action has been added ( QActionEvent).Īn action has been changed ( QActionEvent).Īn action has been removed ( QActionEvent).Ī widget's top-level window activation state has changed. Subclasses of QEvent contain additional parameters that describe the particular event. It is set by default, but don't rely on this as subclasses may choose to clear it in their constructor. The accept flag set with accept(), and cleared with ignore(). The basic QEvent contains only an event type parameter and an "accept" flag. QObject::installEventFilter() allows an object to intercept events destined for another object.
By default, events are dispatched to event handlers like QObject::timerEvent() and QWidget::mouseMoveEvent(). The function can be reimplemented in subclasses to customize event handling and add additional event types QWidget::event() is a notable example.
QObjects receive events by having their QObject::event() function called. In general, events come from the underlying window system ( spontaneous() returns true), but it is also possible to manually send events using QCoreApplication::sendEvent() and QCoreApplication::postEvent() ( spontaneous() returns false). Qt's main event loop ( QCoreApplication::exec()) fetches native window system events from the event queue, translates them into QEvents, and sends the translated events to QObjects.
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