QEventTransition Class Reference

Detailed Description

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);

Subclassing

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.