The QEventTransition class provides a QObject-specific transition for Qt events. More...
#include <QEventTransition>Inherits: QAbstractTransition.
Inherited by: QKeyEventTransition and QMouseEventTransition.
This class was introduced in Qt 4.6.
| QEventTransition ( QState * sourceState = 0 ) | |
| QEventTransition ( QObject * object, QEvent::Type type, QState * sourceState = 0 ) | |
| ~QEventTransition () | |
| QObject * | eventSource () const |
| QEvent::Type | eventType () const |
| void | setEventSource ( QObject * object ) |
| void | setEventType ( QEvent::Type type ) |
| virtual bool | event ( QEvent * e ) |
| virtual bool | eventTest ( QEvent * event ) |
| virtual void | onTransition ( QEvent * event ) |
The QEventTransition class provides a QObject-specific transition for Qt events.
A QEventTransition object binds an event to a particular QObject. QEventTransition is part of The State Machine Framework.
Example:
QPushButton *button = ...; QState *s1 = ...; QState *s2 = ...; // If in s1 and the button receives an Enter event, transition to s2 QEventTransition *enterTransition = new QEventTransition(button, QEvent::Enter); enterTransition->setTargetState(s2); s1->addTransition(enterTransition); // If in s2 and the button receives an Exit event, transition back to s1 QEventTransition *leaveTransition = new QEventTransition(button, QEvent::Leave); leaveTransition->setTargetState(s1); s2->addTransition(leaveTransition);
When reimplementing the eventTest() function, you should first call the base implementation to verify that the event is a QStateMachine::WrappedEvent for the proper object and event type. You may then cast the event to a QStateMachine::WrappedEvent and get the original event by calling QStateMachine::WrappedEvent::event(), and perform additional checks on that object.
See also QState::addTransition().
This property holds the event source that this event transition is associated with.
Access functions:
| QObject * | eventSource () const |
| void | setEventSource ( QObject * object ) |
This property holds the type of event that this event transition is associated with.
Access functions:
| QEvent::Type | eventType () const |
| void | setEventType ( QEvent::Type type ) |
Constructs a new QEventTransition object with the given sourceState.
Constructs a new QEventTransition object associated with events of the given type for the given object, and with the given sourceState.
Destroys this QObject event transition.
Reimplemented from QObject::event().
Reimplemented from QAbstractTransition::eventTest().
Reimplemented from QAbstractTransition::onTransition().