QSignalTransition

Note

This class was introduced in Qt 4.6

Synopsis

Functions

• def senderObject ()
• def setSenderObject (sender)
• def setSignal (signal)
• def signal ()

Detailed Description

The PySide.QtCore.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 PySide.QtCore.QSignalTransition objects directly. PySide.QtCore.QSignalTransition is part of The State Machine Framework .

You can subclass PySide.QtCore.QSignalTransition and reimplement PySide.QtCore.QSignalTransition.eventTest() to make a signal transition conditional; the event object passed to PySide.QtCore.QSignalTransition.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);

class PySide.QtCore.QSignalTransition(arg__1[, arg__2=None])

class PySide.QtCore.QSignalTransition(sender, signal[, sourceState=None])

class PySide.QtCore.QSignalTransition([sourceState=None])

Parameters:

• sender – PySide.QtCore.QObject
• sourceState – PySide.QtCore.QState
• signal – str
• arg__1 – PyObject
• arg__2 – PySide.QtCore.QState

Constructs a new signal transition associated with the given signal of the given sender , and with the given sourceState .

Constructs a new signal transition with the given sourceState .

PySide.QtCore.QSignalTransition.senderObject()

Return type:PySide.QtCore.QObject

This property holds the sender object that this signal transition is associated with.

PySide.QtCore.QSignalTransition.setSenderObject(sender)

Parameters:sender – PySide.QtCore.QObject

This property holds the sender object that this signal transition is associated with.

PySide.QtCore.QSignalTransition.setSignal(signal)

Parameters:signal – PySide.QtCore.QByteArray

This property holds the signal that this signal transition is associated with.

PySide.QtCore.QSignalTransition.signal()

Return type:PySide.QtCore.QByteArray

This property holds the signal that this signal transition is associated with.