| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtCore module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** BSD License Usage |
| ** Alternatively, 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 The Qt Company Ltd 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> |
| |
| //! [0] |
| class Factorial : public QObject |
| { |
| Q_OBJECT |
| Q_PROPERTY(int x READ x WRITE setX) |
| Q_PROPERTY(int fac READ fac WRITE setFac) |
| public: |
| using QObject::QObject; |
| |
| 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 = -1; |
| int m_fac = 1; |
| }; |
| //! [0] |
| |
| //! [1] |
| class FactorialLoopTransition : public QSignalTransition |
| { |
| public: |
| FactorialLoopTransition(Factorial *fact) |
| : QSignalTransition(fact, &Factorial::xChanged), m_fact(fact) |
| {} |
| |
| bool eventTest(QEvent *e) override |
| { |
| if (!QSignalTransition::eventTest(e)) |
| return false; |
| QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e); |
| return se->arguments().at(0).toInt() > 1; |
| } |
| |
| void onTransition(QEvent *e) override |
| { |
| 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, &Factorial::xChanged), m_fact(fact) |
| {} |
| |
| bool eventTest(QEvent *e) override |
| { |
| if (!QSignalTransition::eventTest(e)) |
| return false; |
| QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e); |
| return se->arguments().at(0).toInt() <= 1; |
| } |
| |
| void onTransition(QEvent *) override |
| { |
| qInfo() << 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, &QStateMachine::finished, &app, QCoreApplication::quit); |
| machine.start(); |
| |
| return app.exec(); |
| } |
| //! [6] |
| |
| #include "main.moc" |