# QEventTransition Class Reference ## [[QtCore](index.htm) module] 该QEventTransition类提供了一个[QObject](qobject.html)特定于Qt的事件过渡。[More...](#details) 继承[QAbstractTransition](qabstracttransition.html)。 通过继承[QKeyEventTransition](qkeyeventtransition.html)和[QMouseEventTransition](qmouseeventtransition.html)。 ### 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)` * * * ## Detailed Description 该QEventTransition类提供了一个[QObject](qobject.html)特定于Qt的事件过渡。 一个QEventTransition对象的事件绑定到一个特定的[QObject](qobject.html)。 QEventTransition是一部分[The State Machine Framework](index.htm)。 例如： ``` [QPushButton](qpushbutton.html) *button = ...; [QState](qstate.html) *s1 = ...; [QState](qstate.html) *s2 = ...; // If in s1 and the button receives an Enter event, transition to s2 QEventTransition *enterTransition = new QEventTransition(button, [QEvent](qevent.html).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](qevent.html).Leave); leaveTransition->setTargetState(s1); s2->addTransition(leaveTransition); ``` ### Subclassing 当重新实现[eventTest](qeventtransition.html#eventTest)（ ）函数，你应该先调用基实现，以验证该事件是[QStateMachine.WrappedEvent](index.htm)为正确的对象和事件类型。然后，您可投的情况下，以一[QStateMachine.WrappedEvent](index.htm)并通过调用得到的原始事件[QStateMachine.WrappedEvent.event](index.htm#event)（ ） ，并执行该对象上的额外检查。 * * * ## Method Documentation ``` QEventTransition.__init__ (self, QState sourceState = None) ``` 该_sourceState_的说法，如果不是没有，原因_self_通过Qt的，而不是PyQt的拥有。 构造一个新的[QEventTransition](qeventtransition.html)与给定对象_sourceState_。 ``` QEventTransition.__init__ (self, QObject object, QEvent.Type type, QState sourceState = None) ``` 该_sourceState_的说法，如果不是没有，原因_self_通过Qt的，而不是PyQt的拥有。 构造一个新的[QEventTransition](qeventtransition.html)与给定的事件相关联的对象_type_对于给定的_object_，并用给定的_sourceState_。 ``` bool QEventTransition.event (self, QEvent e) ``` 从重新实现[QObject.event](qobject.html#event)（ ） 。 ``` QObject QEventTransition.eventSource (self) ``` [ ``` bool QEventTransition.eventTest (self, QEvent event) ``` ](qobject.html) [从重新实现](qobject.html)[QAbstractTransition.eventTest](qabstracttransition.html#eventTest)（ ） 。 ``` QEvent.Type QEventTransition.eventType (self) ``` [ ``` QEventTransition.onTransition (self, QEvent event) ``` ](qevent.html#Type-enum) [从重新实现](qevent.html#Type-enum)[QAbstractTransition.onTransition](qabstracttransition.html#onTransition)（ ） 。 ``` QEventTransition.setEventSource (self, QObject object) ``` ``` QEventTransition.setEventType (self, QEvent.Type type) ```