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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsignaltransition.h"
#ifndef QT_NO_STATEMACHINE
#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.
\since 4.6
\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::senderObject
\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::unregister()
{
Q_Q(QSignalTransition);
if ((signalIndex == -1) || !machine())
return;
QStateMachinePrivate::get(machine())->unregisterSignalTransition(q);
}
void QSignalTransitionPrivate::maybeRegister()
{
Q_Q(QSignalTransition);
if (!machine() || !machine()->configuration().contains(sourceState()))
return;
QStateMachinePrivate::get(machine())->registerSignalTransition(q);
}
/*!
Constructs a new signal transition with the given \a sourceState.
*/
QSignalTransition::QSignalTransition(QState *sourceState)
: QAbstractTransition(*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)
: QAbstractTransition(*new QSignalTransitionPrivate, 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->unregister();
d->sender = sender;
d->maybeRegister();
}
/*!
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->unregister();
d->signal = signal;
d->maybeRegister();
}
/*!
\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)
{
Q_D(const QSignalTransition);
if (event->type() == QEvent::Signal) {
if (d->signalIndex == -1)
return false;
QSignalEvent *se = static_cast<QSignalEvent*>(event);
return (se->sender() == d->sender)
&& (se->signalIndex() == d->signalIndex);
}
return false;
}
/*!
\reimp
*/
void QSignalTransition::onTransition(QEvent *event)
{
Q_UNUSED(event);
}
/*!
\reimp
*/
bool QSignalTransition::event(QEvent *e)
{
return QAbstractTransition::event(e);
}
void QSignalTransitionPrivate::callOnTransition(QEvent *e)
{
Q_Q(QSignalTransition);
if (e->type() == QEvent::Signal) {
QSignalEvent *se = static_cast<QSignalEvent *>(e);
int savedSignalIndex = se->m_signalIndex;
se->m_signalIndex = originalSignalIndex;
q->onTransition(e);
se->m_signalIndex = savedSignalIndex;
} else {
q->onTransition(e);
}
}
QT_END_NAMESPACE
#endif //QT_NO_STATEMACHINE
|
