qquickspritegoal.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquickspritegoal_p.h"
#include <private/qquickspriteengine_p.h>
#include <private/qquicksprite_p.h>
#include "qquickimageparticle_p.h"
#include <QDebug>
 
QT_BEGIN_NAMESPACE
 
QQuickSpriteGoalAffector::QQuickSpriteGoalAffector(QQuickItem *parent) :
    QQuickParticleAffector(parent),
    m_goalIdx(-1),
    m_lastEngine(nullptr),
    m_jump(false),
    m_systemStates(false),
    m_notUsingEngine(false)
{
    m_ignoresTime = true;
}
 
void QQuickSpriteGoalAffector::updateStateIndex(QQuickStochasticEngine* e)
{
    if (m_systemStates){
        m_goalIdx = m_system->groupIds[m_goalState];
    }else{
        m_lastEngine = e;
        for (int i=0; i<e->stateCount(); i++){
            if (e->state(i)->name() == m_goalState){
                m_goalIdx = i;
                return;
            }
        }
        m_goalIdx = -1;//Can't find it
    }
}
 
void QQuickSpriteGoalAffector::setGoalState(const QString &arg)
{
    if (m_goalState != arg) {
        m_goalState = arg;
        emit goalStateChanged(arg);
        if (m_goalState.isEmpty())
            m_goalIdx = -1;
        else
            m_goalIdx = -2;
    }
}
 
bool QQuickSpriteGoalAffector::affectParticle(QQuickParticleData *d, qreal dt)
{
    Q_UNUSED(dt);
    QQuickStochasticEngine *engine = nullptr;
    if (!m_systemStates){
        //TODO: Affect all engines
        for (QQuickParticlePainter *p : m_system->groupData[d->groupId]->painters) {
            if (qobject_cast<QQuickImageParticle*>(p))
                engine = qobject_cast<QQuickImageParticle*>(p)->spriteEngine();
        }
    } else {
        engine = m_system->stateEngine;
        if (!engine)
            m_notUsingEngine = true;
    }
    if (!engine && !m_notUsingEngine)
        return false;
 
    if (m_goalIdx == -2 || engine != m_lastEngine)
        updateStateIndex(engine);
    int index = d->index;
    if (m_systemStates)
        index = d->systemIndex;
    if (m_notUsingEngine){//systemStates && no stochastic states defined. So cut out the engine
        //TODO: It's possible to move to a group that is intermediate and not used by painters or emitters - but right now that will redirect to the default group
        m_system->moveGroups(d, m_goalIdx);
    }else if (engine->curState(index) != m_goalIdx){
        engine->setGoal(m_goalIdx, index, m_jump);
        return true; //Doesn't affect particle data, but necessary for onceOff
    }
    return false;
}
 
QT_END_NAMESPACE
 
#include "moc_qquickspritegoal_p.cpp"