QSignalTransition

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

New in version 4.6.

Synopsis

Functions

• def senderObject ()

• def setSenderObject (sender)

• def setSignal (signal)

• def signal ()

Detailed Description

Typically you would use the overload of 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 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 QSignalTransition(arg__1[, arg__2=None])

QSignalTransition([sourceState=None])

QSignalTransition(sender, signal[, sourceState=None])

param sourceState

QState

param signal

str

param arg__1

PyObject

param arg__2

QState

param sender

QObject

Constructs a new signal transition with the given sourceState .

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

PySide2.QtCore.QSignalTransition.senderObject()

Return type

QObject

Returns the sender object associated with this signal transition.

See also

setSenderObject()

PySide2.QtCore.QSignalTransition.setSenderObject(sender)

Parameters

sender – QObject

Sets the sender object associated with this signal transition.

See also

senderObject()

PySide2.QtCore.QSignalTransition.setSignal(signal)

Parameters

signal – QByteArray

Sets the signal associated with this signal transition.

See also

signal()

PySide2.QtCore.QSignalTransition.signal()

Return type

QByteArray

Returns the signal associated with this signal transition.

See also

setSignal()