Contents

• Properties
• Public Functions
• Reimplemented Protected Functions
• Detailed Description
• Subclassing

Detailed Description

TheQEventTransition class provides aQObject-specific transition for Qt events.

AQEventTransition object binds an event to a particularQObject.QEventTransition is part ofThe State Machine Framework.

Example:

QPushButton*button=...;QState*s1=...;QState*s2=...;// If in s1 and the button receives an Enter event, transition to s2QEventTransition*enterTransition=newQEventTransition(button,QEvent::Enter);enterTransition->setTargetState(s2);s1->addTransition(enterTransition);// If in s2 and the button receives an Exit event, transition back to s1QEventTransition*leaveTransition=newQEventTransition(button,QEvent::Leave);leaveTransition->setTargetState(s1);s2->addTransition(leaveTransition);

Subclassing

When reimplementing theeventTest() function, you should first call the base implementation to verify that the event is aQStateMachine::WrappedEvent for the proper object and event type. You may then cast the event to aQStateMachine::WrappedEvent and get the original event by callingQStateMachine::WrappedEvent::event(), and perform additional checks on that object.

Property Documentation

eventSource :QObject *

This property holds the event source that this event transition is associated with.

Access functions:

eventType :QEvent::Type

This property holds the type of event that this event transition is associated with.

Access functions:

Member Function Documentation

QEventTransition::QEventTransition(QState * sourceState = 0)

Constructs a newQEventTransition object with the givensourceState.

QEventTransition::QEventTransition(QObject * object,QEvent::Type type,QState * sourceState = 0)

Constructs a newQEventTransition object associated with events of the giventype for the givenobject, and with the givensourceState.

QEventTransition::~QEventTransition()

Destroys thisQObject event transition.

[virtual protected]bool QEventTransition::event(QEvent * e)

Reimplemented fromQObject::event().

[virtual protected]bool QEventTransition::eventTest(QEvent * event)

Reimplemented fromQAbstractTransition::eventTest().

[virtual protected]void QEventTransition::onTransition(QEvent * event)

Reimplemented fromQAbstractTransition::onTransition().