QSignalTransition Class ReferenceThe QSignalTransition class provides a transition based on a Qt signal. More... #include <QSignalTransition> Inherits QAbstractTransition. This class was introduced in Qt 4.6. Properties
Public Functions
Reimplemented Protected Functions
Additional Inherited Members
Detailed DescriptionThe QSignalTransition class provides a transition based on a Qt signal. 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); Property DocumentationsenderObject : QObject *This property holds the sender object that this signal transition is associated with. Access functions:
signal : QByteArrayThis property holds the signal that this signal transition is associated with. Access functions:
Member Function DocumentationQSignalTransition::QSignalTransition ( QState * sourceState = 0 )Constructs a new signal transition with the given sourceState. QSignalTransition::QSignalTransition ( QObject * sender, const char * signal, QState * sourceState = 0 )Constructs a new signal transition associated with the given signal of the given sender, and with the given sourceState. QSignalTransition::~QSignalTransition ()Destroys this signal transition. bool QSignalTransition::event ( QEvent * e ) [virtual protected]Reimplemented from QObject::event(). bool QSignalTransition::eventTest ( QEvent * event ) [virtual protected]Reimplemented from QAbstractTransition::eventTest(). The default implementation returns true if the event is a QStateMachine::SignalEvent object and the event's sender and signal index match this transition, and returns false otherwise. void QSignalTransition::onTransition ( QEvent * event ) [virtual protected]Reimplemented from QAbstractTransition::onTransition(). X
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