Home · All Classes · Modules

QEventTransition Class Reference
^{[QtCore module]}

The QEventTransition class provides a QObject-specific transition for Qt events. More...

Inherits QAbstractTransition.

Inherited by QKeyEventTransition and QMouseEventTransition.

Methods

• __init__ (self, QState sourceState = None)
• __init__ (self, QObject object, QEvent.Type type, QState sourceState = None)
• bool event (self, QEvent e)
• QObject eventSource (self)
• bool eventTest (self, QEvent event)
• QEvent.Type eventType (self)
• onTransition (self, QEvent event)
• setEventSource (self, QObject object)
• setEventType (self, QEvent.Type type)

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.

Method Documentation

QEventTransition.__init__ (self, QState sourceState = None)

Constructs a new QEventTransition object with the given sourceState.

QEventTransition.__init__ (self, QObject object, QEvent.Type type, QState sourceState = None)

Constructs a new QEventTransition object associated with events of the given type for the given object, and with the given sourceState.

bool QEventTransition.event (self, QEvent e)

Reimplemented from QObject.event().

QObject QEventTransition.eventSource (self)

bool QEventTransition.eventTest (self, QEvent event)

Reimplemented from QAbstractTransition.eventTest().

QEvent.Type QEventTransition.eventType (self)

QEventTransition.onTransition (self, QEvent event)

Reimplemented from QAbstractTransition.onTransition().

QEventTransition.setEventSource (self, QObject object)

QEventTransition.setEventType (self, QEvent.Type type)