qquickparticlepainter_p.h

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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
 
#ifndef PARTICLE_H
#define PARTICLE_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QObject>
#include <QDebug>
#include <QPair>
#include "qquickparticlesystem_p.h"
 
QT_BEGIN_NAMESPACE
 
class Q_QUICKPARTICLES_PRIVATE_EXPORT QQuickParticlePainter : public QQuickItem
{
    Q_OBJECT
    Q_PROPERTY(QQuickParticleSystem* system READ system WRITE setSystem NOTIFY systemChanged FINAL)
    Q_PROPERTY(QStringList groups READ groups WRITE setGroups NOTIFY groupsChanged FINAL)
 
    QML_NAMED_ELEMENT(ParticlePainter)
    QML_ADDED_IN_VERSION(2, 0)
    QML_UNCREATABLE("Abstract type. Use one of the inheriting types instead.")
 
public: // data
    typedef QQuickParticleVarLengthArray<QQuickParticleGroupData::ID, 4> GroupIDs;
 
public:
    explicit QQuickParticlePainter(QQuickItem *parent = nullptr);
    //Data Interface to system
    void load(QQuickParticleData*);
    void reload(QQuickParticleData*);
    void setCount(int c);
 
    int count() const
    {
        return m_count;
    }
 
    void performPendingCommits();//Called from updatePaintNode
    QQuickParticleSystem* system() const
    {
        return m_system;
    }
 
    QStringList groups() const
    {
        return m_groups;
    }
 
    const GroupIDs &groupIds() const
    {
        if (m_groupIdsNeedRecalculation) {
            recalculateGroupIds();
        }
        return m_groupIds;
    }
 
    void itemChange(ItemChange, const ItemChangeData &) override;
 
Q_SIGNALS:
    void countChanged();
    void systemChanged(QQuickParticleSystem* arg);
 
    void groupsChanged(const QStringList &arg);
 
public Q_SLOTS:
    void setSystem(QQuickParticleSystem* arg);
 
    void setGroups(const QStringList &arg);
 
    void calcSystemOffset(bool resetPending = false);
 
private Q_SLOTS:
    virtual void sceneGraphInvalidated() {}
 
protected:
    /* Reset resets all your internal data structures. But anything attached to a particle should
       be in attached data. So reset + reloads should have no visible effect.
       ###Hunt down all cases where we do a complete reset for convenience and be more targeted
    */
    virtual void reset();
 
    void componentComplete() override;
    virtual void initialize(int gIdx, int pIdx){//Called from main thread
        Q_UNUSED(gIdx);
        Q_UNUSED(pIdx);
    }
    virtual void commit(int gIdx, int pIdx){//Called in Render Thread
        //###If you need to do something on size changed, check m_data size in this? Or we reset you every time?
        Q_UNUSED(gIdx);
        Q_UNUSED(pIdx);
    }
 
    QQuickParticleSystem* m_system;
    friend class QQuickParticleSystem;
    int m_count;
    bool m_pleaseReset;//Used by subclasses, but it's a nice optimization to know when stuff isn't going to matter.
    QPointF m_systemOffset;
 
    QQuickWindow *m_window;
    bool m_windowChanged;
 
private: // methods
    void recalculateGroupIds() const;
 
private: // data
    QStringList m_groups;
    QSet<QPair<int,int> > m_pendingCommits;
    mutable GroupIDs m_groupIds;
    mutable bool m_groupIdsNeedRecalculation;
};
 
QT_END_NAMESPACE
#endif // PARTICLE_H