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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 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qtransition.h"
#include "qtransition_p.h"
#include "qstateaction.h"
#include "qstateaction_p.h"
QT_BEGIN_NAMESPACE
/*!
\class QTransition
\brief The QTransition class provides an action-based transition.
\since 4.6
\ingroup statemachine
QTransition provides an action-based transition; you add actions with the
addAction() function. The transition executes the actions when the
transition is triggered. QTransition is part of \l{The State Machine
Framework}.
The invokeMethodOnTransition() function is used for defining method
invocations that should be performed when a transition is taken.
\code
QStateMachine machine;
QState *s1 = new QState();
machine.addState(s1);
QTransition *t1 = new QTransition();
QLabel label;
t1->invokeMethodOnTransition(&label, "clear");
QState *s2 = new QState();
machine.addState(s2);
t1->setTargetState(s2);
s1->addTransition(t1);
\endcode
Actions are executed in the order in which they were added.
\sa QState::addTransition(), QStateAction
*/
QTransitionPrivate::QTransitionPrivate()
{
}
QTransitionPrivate::~QTransitionPrivate()
{
}
QTransitionPrivate *QTransitionPrivate::get(QTransition *q)
{
return q->d_func();
}
const QTransitionPrivate *QTransitionPrivate::get(const QTransition *q)
{
return q->d_func();
}
QList<QStateAction*> QTransitionPrivate::actions() const
{
QList<QStateAction*> result;
QList<QObject*>::const_iterator it;
#ifdef QT_STATEMACHINE_SOLUTION
const QObjectList &children = q_func()->children();
#endif
for (it = children.constBegin(); it != children.constEnd(); ++it) {
QStateAction *s = qobject_cast<QStateAction*>(*it);
if (s)
result.append(s);
}
return result;
}
/*!
Constructs a new QTransition object with the given \a sourceState.
*/
QTransition::QTransition(QState *sourceState)
: QAbstractTransition(*new QTransitionPrivate, sourceState)
{
}
/*!
Constructs a new QTransition object with the given \a targets and \a
sourceState.
*/
QTransition::QTransition(const QList<QAbstractState*> &targets, QState *sourceState)
: QAbstractTransition(*new QTransitionPrivate, targets, sourceState)
{
}
/*!
\internal
*/
QTransition::QTransition(QTransitionPrivate &dd, QState *parent)
: QAbstractTransition(dd, parent)
{
}
/*!
\internal
*/
QTransition::QTransition(QTransitionPrivate &dd, const QList<QAbstractState*> &targets, QState *parent)
: QAbstractTransition(dd, targets, parent)
{
}
/*!
Destroys this transition.
*/
QTransition::~QTransition()
{
}
/*!
Instructs this QTransition to invoke the given \a method of the given \a
object with the given \a arguments when the transition is taken. This
function will create a QStateInvokeMethodAction object and add it to the
actions of the transition.
*/
void QTransition::invokeMethodOnTransition(QObject *object, const char *method,
const QList<QVariant> &arguments)
{
addAction(new QStateInvokeMethodAction(object, method, arguments));
}
/*!
Adds the given \a action to this transition.
The action will be executed when the transition is triggered.
The transition takes ownership of the action.
\sa removeAction()
*/
void QTransition::addAction(QStateAction *action)
{
if (!action) {
qWarning("QTransition::addAction: cannot add null action");
return;
}
action->setParent(this);
}
/*!
Removes the given \a action from this transition.
The transition releases ownership of the action.
\sa addAction()
*/
void QTransition::removeAction(QStateAction *action)
{
if (!action) {
qWarning("QTransition::removeAction: cannot remove null action");
return;
}
action->setParent(0);
}
/*!
Returns this transitions's actions, or an empty list if the transition has
no actions.
\sa addAction()
*/
QList<QStateAction*> QTransition::actions() const
{
Q_D(const QTransition);
return d->actions();
}
/*!
\reimp
*/
void QTransition::onTransition()
{
Q_D(QTransition);
QList<QStateAction*> actions = d->actions();
for (int i = 0; i < actions.size(); ++i)
QStateActionPrivate::get(actions.at(i))->callExecute();
}
/*!
\reimp
*/
bool QTransition::event(QEvent *e)
{
return QAbstractTransition::event(e);
}
QT_END_NAMESPACE
|
