<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Qt 4.6: main.cpp Example File (statemachine/factorial/main.cpp)</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td> <td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">main.cpp Example File<br /><span class="small-subtitle">statemachine/factorial/main.cpp</span> </h1> <pre><span class="comment"> /**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtCore module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** 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. ** ** 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 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; }; class FactorialLoopTransition : public QSignalTransition { public: FactorialLoopTransition(Factorial *fact) : QSignalTransition(fact, SIGNAL(xChanged(int))), m_fact(fact) {} virtual bool eventTest(QEvent *e) { if (!QSignalTransition::eventTest(e)) return false; QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e); return se->arguments().at(0).toInt() > 1; } virtual void onTransition(QEvent *e) { QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e); int x = se->arguments().at(0).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(int))), m_fact(fact) {} virtual bool eventTest(QEvent *e) { if (!QSignalTransition::eventTest(e)) return false; QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e); return se->arguments().at(0).toInt() <= 1; } virtual void onTransition(QEvent *) { 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 *compute = new QState(&machine); compute->assignProperty(&factorial, "fac", 1); compute->assignProperty(&factorial, "x", 6); compute->addTransition(new FactorialLoopTransition(&factorial)); QFinalState *done = new QFinalState(&machine); FactorialDoneTransition *doneTransition = new FactorialDoneTransition(&factorial); doneTransition->setTargetState(done); compute->addTransition(doneTransition); machine.setInitialState(compute); QObject::connect(&machine, SIGNAL(finished()), &app, SLOT(quit())); machine.start(); return app.exec(); } #include "main.moc"</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="40%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td> <td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="40%" align="right"><div align="right">Qt 4.6.3</div></td> </tr></table></div></address></body> </html>