main.cpp Example Filestatemachine/factorial/main.cpp/**************************************************************************** ** ** Copyright (C) 2011 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. ** ** $QT_BEGIN_LICENSE:BSD$ ** You may use this file under the terms of the BSD license as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor ** the names of its contributors may be used to endorse or promote ** products derived from this software without specific prior written ** permission. ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** $QT_END_LICENSE$ ** ****************************************************************************/ #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" |
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