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);

Member Function Documentation

QSignalTransition::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.

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

Reimplemented from QObject::event().

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

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.

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

Reimplemented from QAbstractTransition::onTransition().