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QSignalTransition Class Reference

^{[ QtCore module]}

The QSignalTransition class provides a transition based on a Qt 信号。 更多...

继承 QAbstractTransition .

方法

• __init__ ( self , QState  sourceState  = None)
• __init__ ( self , QObject  sender , SIGNAL()  signal , QState  sourceState  = None)
• __init__ ( self , signal  signal , QState  sourceState  = None)
• bool event ( self , QEvent  e )
• bool eventTest ( self , QEvent  event )
• onTransition ( self , QEvent  event )
• QObject senderObject ( self )
• setSenderObject ( self , QObject  sender )
• setSignal ( self , QByteArray  signal )
• QByteArray signal ( self )

---

详细描述

The QSignalTransition class provides a transition based on a Qt 信号。

Typically you would use the overload of QState.addTransition () that takes a sender and signal as arguments, rather than creating QSignalTransition objects directly. QSignalTransition is part of The State Machine Framework .

You can subclass QSignalTransition and reimplement eventTest () to make a signal transition conditional; the event object passed to eventTest () will be a QStateMachine.SignalEvent object. Example:

 class CheckedTransition : public QSignalTransition
 {
 public:
     CheckedTransition(QCheckBox *check)
         : QSignalTransition(check, SIGNAL(stateChanged(int))) {}
 protected:
     bool eventTest(QEvent *e) {
         if (!QSignalTransition.eventTest(e))
             return false;
         QStateMachine.SignalEvent *se = static_cast<QStateMachine.SignalEvent*>(e);
         return (se->arguments().at(0).toInt() == Qt.Checked);
     }
 };
 ...
 QCheckBox *check = new QCheckBox();
 check->setTristate(true);
 QState *s1 = new QState();
 QState *s2 = new QState();
 CheckedTransition *t1 = new CheckedTransition(check);
 t1->setTargetState(s2);
 s1->addTransition(t1);
			

---

方法文档编制

QSignalTransition.__init__ ( self , QState   sourceState  = None)

sourceState argument, if not None, causes self to be owned by Qt instead of PyQt.

Constructs a new signal transition with the given sourceState .

QSignalTransition.__init__ ( self , QObject   sender , SIGNAL()  signal , QState   sourceState  = None)

sourceState argument, if not None, causes self to be owned by Qt instead of PyQt.

Constructs a new signal transition associated with the given signal of the given sender ，和采用给定 sourceState .

QSignalTransition.__init__ ( self , signal  signal , QState   sourceState  = None)

sourceState argument, if not None, causes self to be owned by Qt instead of PyQt.

bool QSignalTransition.event ( self , QEvent   e )

重实现自 QObject.event ().

bool QSignalTransition.eventTest ( self , QEvent   event )

重实现自 QAbstractTransition.eventTest ().

The default implementation returns true if the event 是 QStateMachine.SignalEvent object and the event's sender and signal index match this transition, and returns false otherwise.

QSignalTransition.onTransition ( self , QEvent   event )

重实现自 QAbstractTransition.onTransition ().

QObject QSignalTransition.senderObject ( self )

QSignalTransition.setSenderObject ( self , QObject   sender )

QSignalTransition.setSignal ( self , QByteArray   signal )

QByteArray QSignalTransition.signal ( self )

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