2011-04-27 10:05:43 +00:00
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/****************************************************************************
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**
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2013-01-02 11:13:29 +00:00
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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2012-09-19 12:28:29 +00:00
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** Contact: http://www.qt-project.org/legal
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2011-04-27 10:05:43 +00:00
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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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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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2012-09-19 12:28:29 +00:00
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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2011-04-27 10:05:43 +00:00
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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2012-01-24 06:17:24 +00:00
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**
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2011-04-27 10:05:43 +00:00
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtCore>
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#include <stdio.h>
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//! [0]
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class Factorial : public QObject
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{
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Q_OBJECT
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Q_PROPERTY(int x READ x WRITE setX)
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Q_PROPERTY(int fac READ fac WRITE setFac)
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public:
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Factorial(QObject *parent = 0)
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: QObject(parent), m_x(-1), m_fac(1)
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{
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}
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int x() const
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{
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return m_x;
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}
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void setX(int x)
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{
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if (x == m_x)
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return;
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m_x = x;
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emit xChanged(x);
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}
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int fac() const
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{
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return m_fac;
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}
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void setFac(int fac)
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{
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m_fac = fac;
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}
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Q_SIGNALS:
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void xChanged(int value);
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2013-03-14 23:42:15 +00:00
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2011-04-27 10:05:43 +00:00
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private:
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int m_x;
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int m_fac;
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};
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//! [0]
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//! [1]
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class FactorialLoopTransition : public QSignalTransition
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{
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public:
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FactorialLoopTransition(Factorial *fact)
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: QSignalTransition(fact, SIGNAL(xChanged(int))), m_fact(fact)
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{}
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virtual bool eventTest(QEvent *e)
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{
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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() > 1;
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}
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virtual void onTransition(QEvent *e)
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{
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QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e);
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int x = se->arguments().at(0).toInt();
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int fac = m_fact->property("fac").toInt();
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m_fact->setProperty("fac", x * fac);
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m_fact->setProperty("x", x - 1);
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}
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private:
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Factorial *m_fact;
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};
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//! [1]
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//! [2]
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class FactorialDoneTransition : public QSignalTransition
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{
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public:
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FactorialDoneTransition(Factorial *fact)
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: QSignalTransition(fact, SIGNAL(xChanged(int))), m_fact(fact)
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{}
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virtual bool eventTest(QEvent *e)
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{
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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() <= 1;
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}
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virtual void onTransition(QEvent *)
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{
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fprintf(stdout, "%d\n", m_fact->property("fac").toInt());
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}
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private:
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Factorial *m_fact;
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};
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//! [2]
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//! [3]
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int main(int argc, char **argv)
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{
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QCoreApplication app(argc, argv);
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Factorial factorial;
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QStateMachine machine;
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//! [3]
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//! [4]
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QState *compute = new QState(&machine);
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compute->assignProperty(&factorial, "fac", 1);
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compute->assignProperty(&factorial, "x", 6);
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compute->addTransition(new FactorialLoopTransition(&factorial));
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//! [4]
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//! [5]
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QFinalState *done = new QFinalState(&machine);
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FactorialDoneTransition *doneTransition = new FactorialDoneTransition(&factorial);
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doneTransition->setTargetState(done);
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compute->addTransition(doneTransition);
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//! [5]
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//! [6]
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machine.setInitialState(compute);
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QObject::connect(&machine, SIGNAL(finished()), &app, SLOT(quit()));
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machine.start();
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return app.exec();
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}
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//! [6]
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#include "main.moc"
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