Method reorderChild

core/2d/ParticleBatchNode.cpp:263–319

Reorder will be done in this function, no "lazy" reorder to particles

// Reorder will be done in this function, no "lazy" reorder to particles
void ParticleBatchNode::reorderChild(Node* aChild, int zOrder)
{
    AXASSERT(aChild != nullptr, "Child must be non-nullptr");
    AXASSERT(dynamic_cast<ParticleSystem*>(aChild) != nullptr,
             "CCParticleBatchNode only supports QuadParticleSystems as children");
    AXASSERT(_children.contains(aChild), "Child doesn't belong to batch");

    ParticleSystem* child = static_cast<ParticleSystem*>(aChild);

    if (zOrder == child->getLocalZOrder())
    {
        return;
    }

    // no reordering if only 1 child
    if (!_children.empty())
    {
        int newIndex = 0, oldIndex = 0;

        getCurrentIndex(&oldIndex, &newIndex, child, zOrder);

        if (oldIndex != newIndex)
        {

            // reorder _children->array
            child->retain();
            _children.erase(oldIndex);
            _children.insert(newIndex, child);
            child->release();

            // save old altasIndex
            int oldAtlasIndex = child->getAtlasIndex();

            // update atlas index
            updateAllAtlasIndexes();

            // Find new AtlasIndex
            int newAtlasIndex = 0;
            for (const auto& iter : _children)
            {
                auto node = static_cast<ParticleSystem*>(iter);
                if (node == child)
                {
                    newAtlasIndex = child->getAtlasIndex();
                    break;
                }
            }

            // reorder textureAtlas quads
            _textureAtlas->moveQuadsFromIndex(oldAtlasIndex, child->getTotalParticles(), newAtlasIndex);

            child->updateWithNoTime();
        }
    }

    child->setLocalZOrder(zOrder);
}