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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

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"