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</tr></table><h1 class="title">main.cpp Example File<br /><span class="small-subtitle">statemachine/factorial/main.cpp</span>

</h1>

<pre><span class="comment"> /****************************************************************************

** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying

** this package.

** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

** $QT_END_LICENSE$

****************************************************************************/</span>

#include <QtCore>

#include <stdio.h>

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_x(-1), m_fac(1)

{

}

int x() const

{

return m_x;

}

void setX(int x)

{

if (x == m_x)

return;

m_x = x;

emit xChanged(x);

}

int fac() const

{

return m_fac;

}

void setFac(int fac)

{

m_fac = fac;

}

Q_SIGNALS:

void xChanged(int value);

private:

int m_x;

int m_fac;

100

};

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class FactorialLoopTransition : public QSignalTransition

103

{

104

public:

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FactorialLoopTransition(Factorial *fact)

106

: QSignalTransition(fact, SIGNAL(xChanged(int))), m_fact(fact)

107

{}

108

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virtual bool eventTest(QEvent *e)

110

{

111

if (!QSignalTransition::eventTest(e))

112

return false;

113

QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e);

114

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);

120

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;

128

};

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class FactorialDoneTransition : public QSignalTransition

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{

132

public:

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FactorialDoneTransition(Factorial *fact)

134

: QSignalTransition(fact, SIGNAL(xChanged(int))), m_fact(fact)

135

{}

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virtual bool eventTest(QEvent *e)

138

{

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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 *)

146

{

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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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int main(int argc, char **argv)

155

{

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QCoreApplication app(argc, argv);

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Factorial factorial;

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QStateMachine machine;

159

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QState *compute = new QState(&machine);

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compute->assignProperty(&factorial, "fac", 1);

162

compute->assignProperty(&factorial, "x", 6);

163

compute->addTransition(new FactorialLoopTransition(&factorial));

164

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QFinalState *done = new QFinalState(&machine);

166

FactorialDoneTransition *doneTransition = new FactorialDoneTransition(&factorial);

167

doneTransition->setTargetState(done);

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compute->addTransition(doneTransition);

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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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#include "main.moc"</pre>

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