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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the $MODULE$ of the Qt Toolkit.
**
** $TROLLTECH_DUAL_LICENSE$
**
****************************************************************************/
#include "qsignaltransition.h"
#include "qsignaltransition_p.h"
#include "qsignalevent.h"
#include "qstate.h"
#include "qstate_p.h"
#include "qstatemachine.h"
#include "qstatemachine_p.h"
#include <qdebug.h>
QT_BEGIN_NAMESPACE
/*!
\class QSignalTransition
\brief The QSignalTransition class provides a transition based on a Qt signal.
\ingroup statemachine
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 \l{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 QSignalEvent object. Example:
\code
class CheckedTransition : public QSignalTransition
{
public:
CheckedTransition(QCheckBox *check)
: QSignalTransition(check, SIGNAL(stateChanged(int))) {}
protected:
bool eventTest(QEvent *e) const {
if (!QSignalTransition::eventTest(e))
return false;
QSignalEvent *se = static_cast<QSignalEvent*>(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);
\endcode
*/
/*!
\property QSignalTransition::object
\brief the sender object that this signal transition is associated with
*/
/*!
\property QSignalTransition::signal
\brief the signal that this signal transition is associated with
*/
QSignalTransitionPrivate::QSignalTransitionPrivate()
{
sender = 0;
signalIndex = -1;
}
QSignalTransitionPrivate *QSignalTransitionPrivate::get(QSignalTransition *q)
{
return q->d_func();
}
void QSignalTransitionPrivate::invalidate()
{
Q_Q(QSignalTransition);
if (signalIndex != -1) {
QState *source = sourceState();
QStatePrivate *source_d = QStatePrivate::get(source);
QStateMachinePrivate *mach = QStateMachinePrivate::get(source_d->machine());
if (mach) {
mach->unregisterSignalTransition(q);
if (mach->configuration.contains(source))
mach->registerSignalTransition(q);
}
}
}
/*!
Constructs a new signal transition with the given \a sourceState.
*/
QSignalTransition::QSignalTransition(QState *sourceState)
: QTransition(*new QSignalTransitionPrivate, sourceState)
{
}
/*!
Constructs a new signal transition associated with the given \a signal of
the given \a sender, and with the given \a sourceState.
*/
QSignalTransition::QSignalTransition(QObject *sender, const char *signal,
QState *sourceState)
: QTransition(*new QSignalTransitionPrivate, sourceState)
{
Q_D(QSignalTransition);
d->sender = sender;
d->signal = signal;
}
/*!
Constructs a new signal transition associated with the given \a signal of
the given \a sender. The transition has the given \a targets and \a
sourceState.
*/
QSignalTransition::QSignalTransition(QObject *sender, const char *signal,
const QList<QAbstractState*> &targets,
QState *sourceState)
: QTransition(*new QSignalTransitionPrivate, targets, sourceState)
{
Q_D(QSignalTransition);
d->sender = sender;
d->signal = signal;
}
/*!
Destroys this signal transition.
*/
QSignalTransition::~QSignalTransition()
{
}
/*!
Returns the sender object associated with this signal transition.
*/
QObject *QSignalTransition::senderObject() const
{
Q_D(const QSignalTransition);
return d->sender;
}
/*!
Sets the \a sender object associated with this signal transition.
*/
void QSignalTransition::setSenderObject(QObject *sender)
{
Q_D(QSignalTransition);
if (sender == d->sender)
return;
d->sender = sender;
d->invalidate();
}
/*!
Returns the signal associated with this signal transition.
*/
QByteArray QSignalTransition::signal() const
{
Q_D(const QSignalTransition);
return d->signal;
}
/*!
Sets the \a signal associated with this signal transition.
*/
void QSignalTransition::setSignal(const QByteArray &signal)
{
Q_D(QSignalTransition);
if (signal == d->signal)
return;
d->signal = signal;
d->invalidate();
}
/*!
\reimp
The \a event is a QSignalEvent object. The default implementation returns
true if the event's sender and signal index match this transition, and
returns false otherwise.
*/
bool QSignalTransition::eventTest(QEvent *event) const
{
Q_D(const QSignalTransition);
#ifndef QT_STATEMACHINE_SOLUTION
if (event->type() == QEvent::Signal) {
#else
if (event->type() == QEvent::Type(QEvent::User-1)) {
#endif
QSignalEvent *se = static_cast<QSignalEvent*>(event);
Q_ASSERT(d->signalIndex != -1);
return (se->sender() == d->sender)
&& (se->signalIndex() == d->signalIndex);
}
return false;
}
/*!
\reimp
*/
void QSignalTransition::onTransition()
{
}
/*!
\reimp
*/
bool QSignalTransition::event(QEvent *e)
{
return QTransition::event(e);
}
QT_END_NAMESPACE
|
