QSignalTransition Class Reference

QSignalTransition Class Reference

[QtCore module]

The QSignalTransition class provides a transition based on a Qt signal. More…

Methods

__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)

Detailed Description

The QSignalTransition class provides a transition based on a Qt signal.

通常，您将使用的过载QState.addTransition（）采用一个发送器和信号作为参数，而不是创建QSignalTransition直接对象。 QSignalTransition是一部分The State Machine Framework。

你可以继承QSignalTransition和重新实现eventTest（）方法使一个信号转换条件;传递给事件对象eventTest（）将一个QStateMachine.SignalEvent对象。例如：

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

Method Documentation

QSignalTransition.__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。

构造具有给定一个新的信号转换sourceState。

QSignalTransition.__init__ (self, QObject sender, SIGNAL() signal, 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。

构造具有给定关联的一个新的信号转换signal的给定sender，并用给定的sourceState。

QSignalTransition.__init__ (self, signal signal, 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。

bool QSignalTransition.event (self, QEvent e)

从重新实现QObject.event（）。

bool QSignalTransition.eventTest (self, QEvent event)

从重新实现QAbstractTransition.eventTest（）。

默认实现返回True，如果event是QStateMachine.SignalEvent对象和事件的发送者和信号索引匹配这个过渡，否则返回False 。

QSignalTransition.onTransition (self, QEvent event)

从重新实现QAbstractTransition.onTransition（）。

QObject QSignalTransition.senderObject (self)

[

QSignalTransition.setSenderObject (self, QObject sender)

QSignalTransition.setSignal (self, QByteArray signal)

](qobject.html)

QByteArray QSignalTransition.signal (self)