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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
#include <QtCore/QEvent>
#include <QtStateMachine/QAbstractTransition>
#include <QtStateMachine/QState>
#include <QtStateMachine/QStateMachine>
static constexpr QEvent::Type PingEventType = QEvent::Type(QEvent::User + 2);
static constexpr QEvent::Type PongEventType = QEvent::Type(QEvent::User + 3);
//! [0]
class PingEvent : public QEvent
{
public:
PingEvent() : QEvent(PingEventType) { }
};
class PongEvent : public QEvent
{
public:
PongEvent() : QEvent(PongEventType) { }
};
//! [0]
//! [1]
class Pinger : public QState
{
public:
explicit Pinger(QState *parent) : QState(parent) { }
protected:
void onEntry(QEvent *) override
{
machine()->postEvent(new PingEvent);
qInfo() << "ping?";
}
};
//! [1]
//! [3]
class PongTransition : public QAbstractTransition
{
public:
PongTransition() {}
protected:
bool eventTest(QEvent *e) override { return (e->type() == PingEventType); }
void onTransition(QEvent *) override
{
machine()->postDelayedEvent(new PingEvent, 500);
qInfo() << "ping?";
}
};
//! [3]
//! [2]
class PingTransition : public QAbstractTransition
{
public:
PingTransition() {}
protected:
bool eventTest(QEvent *e) override { return e->type() == PingEventType; }
void onTransition(QEvent *) override
{
machine()->postDelayedEvent(new PongEvent, 500);
qInfo() << "pong!";
}
};
//! [2]
//! [4]
int main(int argc, char **argv)
{
QCoreApplication app(argc, argv);
QStateMachine machine;
auto group = new QState(QState::ParallelStates);
group->setObjectName("group");
//! [4]
//! [5]
auto pinger = new Pinger(group);
pinger->setObjectName("pinger");
pinger->addTransition(new PongTransition);
auto ponger = new QState(group);
ponger->setObjectName("ponger");
ponger->addTransition(new PingTransition);
//! [5]
//! [6]
machine.addState(group);
machine.setInitialState(group);
machine.start();
return app.exec();
}
//! [6]
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