lifecycle.cpp Example File

animation/stickman/lifecycle.cpp
/****************************************************************************
**
** 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 "lifecycle.h"
#include "stickman.h"
#include "node.h"
#include "animation.h"
#include "graphicsview.h"

#include <QtCore>
#include <QtWidgets>

class KeyPressTransition: public QSignalTransition
{
public:
    KeyPressTransition(GraphicsView *receiver, Qt::Key key)
        : QSignalTransition(receiver, SIGNAL(keyPressed(int))), m_key(key)
    {
    }
    KeyPressTransition(GraphicsView *receiver, Qt::Key key, QAbstractState *target)
        : QSignalTransition(receiver, SIGNAL(keyPressed(int))), m_key(key)
    {
        setTargetState(target);
    }

    virtual bool eventTest(QEvent *e) Q_DECL_OVERRIDE
    {
        if (QSignalTransition::eventTest(e)) {
            QVariant key = static_cast<QStateMachine::SignalEvent*>(e)->arguments().at(0);
            return (key.toInt() == int(m_key));
        }

        return false;
    }
private:
    Qt::Key m_key;
};

class LightningStrikesTransition: public QEventTransition
{
public:
    LightningStrikesTransition(QAbstractState *target)
        : QEventTransition(this, QEvent::Timer)
    {
        setTargetState(target);
        qsrand((uint)QDateTime::currentDateTime().toTime_t());
        startTimer(1000);
    }

    virtual bool eventTest(QEvent *e) Q_DECL_OVERRIDE
    {
        return QEventTransition::eventTest(e) && ((qrand() % 50) == 0);
    }
};

LifeCycle::LifeCycle(StickMan *stickMan, GraphicsView *keyReceiver)
    : m_stickMan(stickMan), m_keyReceiver(keyReceiver)
{
    // Create animation group to be used for all transitions
    m_animationGroup = new QParallelAnimationGroup();
    const int stickManNodeCount = m_stickMan->nodeCount();
    for (int i=0; i<stickManNodeCount; ++i) {
        QPropertyAnimation *pa = new QPropertyAnimation(m_stickMan->node(i), "pos");
        m_animationGroup->addAnimation(pa);
    }

    // Set up initial state graph
    m_machine = new QStateMachine();
    m_machine->addDefaultAnimation(m_animationGroup);

    m_alive = new QState(m_machine);
    m_alive->setObjectName("alive");

    // Make it blink when lightning strikes before entering dead animation
    QState *lightningBlink = new QState(m_machine);
    lightningBlink->assignProperty(m_stickMan->scene(), "backgroundBrush", QColor(Qt::white));
    lightningBlink->assignProperty(m_stickMan, "penColor", QColor(Qt::black));
    lightningBlink->assignProperty(m_stickMan, "fillColor", QColor(Qt::white));
    lightningBlink->assignProperty(m_stickMan, "isDead", true);

    QTimer *timer = new QTimer(lightningBlink);
    timer->setSingleShot(true);
    timer->setInterval(100);
    QObject::connect(lightningBlink, SIGNAL(entered()), timer, SLOT(start()));
    QObject::connect(lightningBlink, SIGNAL(exited()), timer, SLOT(stop()));

    m_dead = new QState(m_machine);
    m_dead->assignProperty(m_stickMan->scene(), "backgroundBrush", QColor(Qt::black));
    m_dead->assignProperty(m_stickMan, "penColor", QColor(Qt::white));
    m_dead->assignProperty(m_stickMan, "fillColor", QColor(Qt::black));
    m_dead->setObjectName("dead");

    // Idle state (sets no properties)
    m_idle = new QState(m_alive);
    m_idle->setObjectName("idle");

    m_alive->setInitialState(m_idle);

    // Lightning strikes at random
    m_alive->addTransition(new LightningStrikesTransition(lightningBlink));
    lightningBlink->addTransition(timer, SIGNAL(timeout()), m_dead);

    m_machine->setInitialState(m_alive);
}

void LifeCycle::setDeathAnimation(const QString &fileName)
{
    QState *deathAnimation = makeState(m_dead, fileName);
    m_dead->setInitialState(deathAnimation);
}

void LifeCycle::start()
{
    m_machine->start();
}

void LifeCycle::addActivity(const QString &fileName, Qt::Key key, QObject *sender, const char *signal)
{
    QState *state = makeState(m_alive, fileName);
    m_alive->addTransition(new KeyPressTransition(m_keyReceiver, key, state));

    if((sender != NULL) || (signal != NULL)) {
        m_alive->addTransition(sender, signal, state);
    }
}

QState *LifeCycle::makeState(QState *parentState, const QString &animationFileName)
{
    QState *topLevel = new QState(parentState);

    Animation animation;
    {
        QFile file(animationFileName);
        if (file.open(QIODevice::ReadOnly))
            animation.load(&file);
    }

    const int frameCount = animation.totalFrames();
    QState *previousState = 0;
    for (int i=0; i<frameCount; ++i) {
        animation.setCurrentFrame(i);

        QState *frameState = new QState(topLevel);
        const int nodeCount = animation.nodeCount();
        for (int j=0; j<nodeCount; ++j)
            frameState->assignProperty(m_stickMan->node(j), "pos", animation.nodePos(j));

        frameState->setObjectName(QString::fromLatin1("frame %0").arg(i));
        if (previousState == 0)
            topLevel->setInitialState(frameState);
        else
            previousState->addTransition(previousState, SIGNAL(propertiesAssigned()), frameState);

        previousState = frameState;
    }

    // Loop
    previousState->addTransition(previousState, SIGNAL(propertiesAssigned()), topLevel->initialState());

    return topLevel;

}

LifeCycle::~LifeCycle()
{
    delete m_machine;
    delete m_animationGroup;
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.