main.cpp 范例文件

statemachine/factorial/main.cpp
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#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) {} 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; }; class FactorialDoneTransition : public QSignalTransition { public: FactorialDoneTransition(Factorial *fact) : QSignalTransition(fact, SIGNAL(xChanged(int))), 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 { 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"