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Diffstat (limited to 'examples/statemachine/factorial/main.cpp')
| -rw-r--r-- | examples/statemachine/factorial/main.cpp | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/examples/statemachine/factorial/main.cpp b/examples/statemachine/factorial/main.cpp new file mode 100644 index 0000000000..15e1306e24 --- /dev/null +++ b/examples/statemachine/factorial/main.cpp @@ -0,0 +1,175 @@ +/**************************************************************************** +** +** 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> + +//! [0] +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; +}; +//! [0] + +//! [1] +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; +}; +//! [1] + +//! [2] +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; +}; +//! [2] + +//! [3] +int main(int argc, char **argv) +{ + QCoreApplication app(argc, argv); + Factorial factorial; + QStateMachine machine; +//! [3] + +//! [4] + QState *compute = new QState(&machine); + compute->assignProperty(&factorial, "fac", 1); + compute->assignProperty(&factorial, "x", 6); + compute->addTransition(new FactorialLoopTransition(&factorial)); +//! [4] + +//! [5] + QFinalState *done = new QFinalState(&machine); + FactorialDoneTransition *doneTransition = new FactorialDoneTransition(&factorial); + doneTransition->setTargetState(done); + compute->addTransition(doneTransition); +//! [5] + +//! [6] + machine.setInitialState(compute); + QObject::connect(&machine, SIGNAL(finished()), &app, SLOT(quit())); + machine.start(); + + return app.exec(); +} +//! [6] + +#include "main.moc" |