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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 "qabstractstate.h"
#include "qabstractstate_p.h"
#include "qstate.h"
#include "qstate_p.h"
#include "qstatemachine.h"
#include "qstatemachine_p.h"
QT_BEGIN_NAMESPACE
/*!
\class QAbstractState
\brief The QAbstractState class is the base class of states of a QStateMachine.
\since 4.6
\ingroup statemachine
The QAbstractState class is the abstract base class of states that are part
of a QStateMachine. It defines the interface that all state objects have in
common. QAbstractState is part of \l{The State Machine Framework}.
The entered() signal is emitted when the state has been entered. The
exited() signal is emitted when the state has been exited.
The parentState() function returns the state's parent state. The machine()
function returns the state machine that the state is part of.
\section1 Subclassing
The onEntry() function is called when the state is entered; reimplement this
function to perform custom processing when the state is entered.
The onExit() function is called when the state is exited; reimplement this
function to perform custom processing when the state is exited.
*/
QAbstractStatePrivate::QAbstractStatePrivate()
{
}
QAbstractStatePrivate *QAbstractStatePrivate::get(QAbstractState *q)
{
return q->d_func();
}
const QAbstractStatePrivate *QAbstractStatePrivate::get(const QAbstractState *q)
{
return q->d_func();
}
QStateMachine *QAbstractStatePrivate::machine() const
{
Q_Q(const QAbstractState);
QObject *par = q->parent();
while (par != 0) {
if (QStateMachine *mach = qobject_cast<QStateMachine*>(par))
return mach;
par = par->parent();
}
return 0;
}
void QAbstractStatePrivate::callOnEntry(QEvent *e)
{
Q_Q(QAbstractState);
q->onEntry(e);
}
void QAbstractStatePrivate::callOnExit(QEvent *e)
{
Q_Q(QAbstractState);
q->onExit(e);
}
void QAbstractStatePrivate::emitEntered()
{
Q_Q(QAbstractState);
emit q->entered();
}
void QAbstractStatePrivate::emitExited()
{
Q_Q(QAbstractState);
emit q->exited();
}
/*!
Constructs a new state with the given \a parent state.
*/
QAbstractState::QAbstractState(QState *parent)
: QObject(*new QAbstractStatePrivate, parent)
{
}
/*!
\internal
*/
QAbstractState::QAbstractState(QAbstractStatePrivate &dd, QState *parent)
: QObject(dd, parent)
{
}
/*!
Destroys this state.
*/
QAbstractState::~QAbstractState()
{
}
/*!
Returns this state's parent state, or 0 if the state has no parent state.
*/
QState *QAbstractState::parentState() const
{
return qobject_cast<QState*>(parent());
}
/*!
Returns the state machine that this state is part of, or 0 if the state is
not part of a state machine.
*/
QStateMachine *QAbstractState::machine() const
{
Q_D(const QAbstractState);
return d->machine();
}
/*!
\fn QAbstractState::onExit(QEvent *event)
This function is called when the state is exited. The given \a event is what
caused the state to be exited. Reimplement this function to perform custom
processing when the state is exited.
*/
/*!
\fn QAbstractState::onEntry(QEvent *event)
This function is called when the state is entered. The given \a event is
what caused the state to be entered. Reimplement this function to perform
custom processing when the state is entered.
*/
/*!
\fn QAbstractState::entered()
This signal is emitted when the state has been entered (after onEntry() has
been called).
*/
/*!
\fn QAbstractState::exited()
This signal is emitted when the state has been exited (after onExit() has
been called).
*/
/*!
\reimp
*/
bool QAbstractState::event(QEvent *e)
{
return QObject::event(e);
}
QT_END_NAMESPACE
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