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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 <QtCore>
+#include <stdio.h>
+#ifdef QT_STATEMACHINE_SOLUTION
+#include <qstatemachine.h>
+#include <qstate.h>
+#include <qsignaltransition.h>
+#include <qfinalstate.h>
+#endif
+
+class Factorial : public QObject
+{
+ Q_OBJECT
+ Q_PROPERTY(int x READ x WRITE setX)
+ Q_PROPERTY(int fac READ fac WRITE setFac)
+public:
+ Factorial(QObject *parent = 0)
+ : QObject(parent)
+ {
+ m_fac = 1;
+ m_x = -1;
+ }
+
+ int x() const
+ {
+ return m_x;
+ }
+
+ void setX(int x)
+ {
+ if (x == m_x)
+ return;
+ m_x = x;
+ emit xChanged();
+ }
+
+ int fac() const
+ {
+ return m_fac;
+ }
+
+ void setFac(int fac)
+ {
+ m_fac = fac;
+ }
+
+Q_SIGNALS:
+ void xChanged();
+
+private:
+ int m_x;
+ int m_fac;
+};
+
+class FactorialLoopTransition : public QSignalTransition
+{
+public:
+ FactorialLoopTransition(Factorial *fact)
+ : QSignalTransition(fact, SIGNAL(xChanged())), m_fact(fact)
+ {}
+
+ virtual bool eventTest(QEvent *) const
+ {
+ return m_fact->property("x").toInt() > 1;
+ }
+
+ virtual void onTransition()
+ {
+ int x = m_fact->property("x").toInt();
+ int fac = m_fact->property("fac").toInt();
+ m_fact->setProperty("fac", x * fac);
+ m_fact->setProperty("x", x - 1);
+ }
+
+private:
+ Factorial *m_fact;
+};
+
+class FactorialDoneTransition : public QSignalTransition
+{
+public:
+ FactorialDoneTransition(Factorial *fact)
+ : QSignalTransition(fact, SIGNAL(xChanged())), m_fact(fact)
+ {}
+
+ virtual bool eventTest(QEvent *) const
+ {
+ return m_fact->property("x").toInt() <= 1;
+ }
+
+ virtual void onTransition()
+ {
+ fprintf(stdout, "%d\n", m_fact->property("fac").toInt());
+ }
+
+private:
+ Factorial *m_fact;
+};
+
+int main(int argc, char **argv)
+{
+ QCoreApplication app(argc, argv);
+
+ Factorial factorial;
+
+ QStateMachine machine;
+
+ QState *computing = new QState(machine.rootState());
+ computing->addTransition(new FactorialLoopTransition(&factorial));
+
+ QFinalState *done = new QFinalState(machine.rootState());
+ FactorialDoneTransition *doneTransition = new FactorialDoneTransition(&factorial);
+ doneTransition->setTargetState(done);
+ computing->addTransition(doneTransition);
+
+ QState *initialize = new QState(machine.rootState());
+ initialize->assignProperty(&factorial, "x", 6);
+ FactorialLoopTransition *enterLoopTransition = new FactorialLoopTransition(&factorial);
+ enterLoopTransition->setTargetState(computing);
+ initialize->addTransition(enterLoopTransition);
+
+ QObject::connect(&machine, SIGNAL(finished()), &app, SLOT(quit()));
+
+ machine.setInitialState(initialize);
+ machine.start();
+
+ return app.exec();
+}
+
+#include "main.moc"