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266 lines
7.3 KiB
C++
266 lines
7.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qsignaltransition.h"
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#ifndef QT_NO_STATEMACHINE
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#include "qsignaltransition_p.h"
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#include "qstate.h"
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#include "qstate_p.h"
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#include "qstatemachine.h"
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#include "qstatemachine_p.h"
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#include <qdebug.h>
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QT_BEGIN_NAMESPACE
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/*!
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\class QSignalTransition
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\brief The QSignalTransition class provides a transition based on a Qt signal.
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\since 4.6
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\ingroup statemachine
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Typically you would use the overload of QState::addTransition() that takes a
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sender and signal as arguments, rather than creating QSignalTransition
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objects directly. QSignalTransition is part of \l{The State Machine
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Framework}.
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You can subclass QSignalTransition and reimplement eventTest() to make a
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signal transition conditional; the event object passed to eventTest() will
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be a QStateMachine::SignalEvent object. Example:
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\code
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class CheckedTransition : public QSignalTransition
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{
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public:
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CheckedTransition(QCheckBox *check)
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: QSignalTransition(check, SIGNAL(stateChanged(int))) {}
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protected:
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bool eventTest(QEvent *e) {
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if (!QSignalTransition::eventTest(e))
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return false;
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QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e);
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return (se->arguments().at(0).toInt() == Qt::Checked);
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}
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};
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...
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QCheckBox *check = new QCheckBox();
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check->setTristate(true);
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QState *s1 = new QState();
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QState *s2 = new QState();
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CheckedTransition *t1 = new CheckedTransition(check);
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t1->setTargetState(s2);
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s1->addTransition(t1);
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\endcode
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*/
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/*!
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\property QSignalTransition::senderObject
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\brief the sender object that this signal transition is associated with
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*/
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/*!
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\property QSignalTransition::signal
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\brief the signal that this signal transition is associated with
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*/
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QSignalTransitionPrivate::QSignalTransitionPrivate()
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{
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sender = 0;
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signalIndex = -1;
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}
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QSignalTransitionPrivate *QSignalTransitionPrivate::get(QSignalTransition *q)
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{
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return q->d_func();
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}
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void QSignalTransitionPrivate::unregister()
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{
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Q_Q(QSignalTransition);
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if ((signalIndex == -1) || !machine())
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return;
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QStateMachinePrivate::get(machine())->unregisterSignalTransition(q);
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}
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void QSignalTransitionPrivate::maybeRegister()
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{
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Q_Q(QSignalTransition);
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if (!machine() || !machine()->configuration().contains(sourceState()))
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return;
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QStateMachinePrivate::get(machine())->registerSignalTransition(q);
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}
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/*!
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Constructs a new signal transition with the given \a sourceState.
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*/
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QSignalTransition::QSignalTransition(QState *sourceState)
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: QAbstractTransition(*new QSignalTransitionPrivate, sourceState)
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{
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}
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/*!
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Constructs a new signal transition associated with the given \a signal of
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the given \a sender, and with the given \a sourceState.
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*/
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QSignalTransition::QSignalTransition(QObject *sender, const char *signal,
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QState *sourceState)
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: QAbstractTransition(*new QSignalTransitionPrivate, sourceState)
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{
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Q_D(QSignalTransition);
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d->sender = sender;
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d->signal = signal;
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}
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/*!
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Destroys this signal transition.
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*/
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QSignalTransition::~QSignalTransition()
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{
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}
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/*!
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Returns the sender object associated with this signal transition.
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*/
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QObject *QSignalTransition::senderObject() const
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{
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Q_D(const QSignalTransition);
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return d->sender;
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}
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/*!
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Sets the \a sender object associated with this signal transition.
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*/
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void QSignalTransition::setSenderObject(QObject *sender)
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{
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Q_D(QSignalTransition);
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if (sender == d->sender)
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return;
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d->unregister();
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d->sender = sender;
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d->maybeRegister();
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}
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/*!
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Returns the signal associated with this signal transition.
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*/
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QByteArray QSignalTransition::signal() const
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{
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Q_D(const QSignalTransition);
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return d->signal;
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}
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/*!
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Sets the \a signal associated with this signal transition.
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*/
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void QSignalTransition::setSignal(const QByteArray &signal)
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{
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Q_D(QSignalTransition);
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if (signal == d->signal)
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return;
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d->unregister();
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d->signal = signal;
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d->maybeRegister();
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}
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/*!
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\reimp
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The default implementation returns true if the \a event is a
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QStateMachine::SignalEvent object and the event's sender and signal index
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match this transition, and returns false otherwise.
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*/
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bool QSignalTransition::eventTest(QEvent *event)
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{
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Q_D(const QSignalTransition);
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if (event->type() == QEvent::StateMachineSignal) {
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if (d->signalIndex == -1)
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return false;
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QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(event);
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return (se->sender() == d->sender)
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&& (se->signalIndex() == d->signalIndex);
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}
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return false;
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}
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/*!
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\reimp
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*/
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void QSignalTransition::onTransition(QEvent *event)
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{
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Q_UNUSED(event);
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}
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/*!
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\reimp
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*/
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bool QSignalTransition::event(QEvent *e)
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{
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return QAbstractTransition::event(e);
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}
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void QSignalTransitionPrivate::callOnTransition(QEvent *e)
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{
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Q_Q(QSignalTransition);
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if (e->type() == QEvent::StateMachineSignal) {
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QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent *>(e);
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int savedSignalIndex = se->m_signalIndex;
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se->m_signalIndex = originalSignalIndex;
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q->onTransition(e);
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se->m_signalIndex = savedSignalIndex;
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} else {
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q->onTransition(e);
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}
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}
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#include "moc_qsignaltransition.h"
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QT_END_NAMESPACE
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#endif //QT_NO_STATEMACHINE
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