geode/loader/src/hooks/GeodeNodeMetadata.cpp

#include <cocos2d.h>
#include <Geode/utils/Ref.hpp>
#include <Geode/utils/cocos.hpp>
#include <Geode/modify/Field.hpp>
#include <Geode/modify/CCNode.hpp>

USE_GEODE_NAMESPACE();
using namespace geode::modifier;

#pragma warning(push)
#pragma warning(disable: 4273)

constexpr auto METADATA_TAG = 0xB324ABC;

struct ProxyCCNode;

class GeodeNodeMetadata final : public cocos2d::CCObject {
private:
    FieldContainer* m_fieldContainer;
    Ref<cocos2d::CCObject> m_userObject;
    std::string m_id = "";

    friend class ProxyCCNode;
    friend class cocos2d::CCNode;

    GeodeNodeMetadata() : m_fieldContainer(new FieldContainer()) {}
    virtual ~GeodeNodeMetadata() {
        delete m_fieldContainer;
    }

public:
    static GeodeNodeMetadata* set(CCNode* target) {
        if (!target) return nullptr;
        
        auto old = target->m_pUserObject;
        // faster than dynamic_cast, technically can 
        // but extremely unlikely to fail
        if (old && old->getTag() == METADATA_TAG) {
            return static_cast<GeodeNodeMetadata*>(old);
        }
        auto meta = new GeodeNodeMetadata();
        meta->autorelease();
        meta->setTag(METADATA_TAG);

        // set user object
        target->m_pUserObject = meta;
        meta->retain();

        if (old) {
            meta->m_userObject = old;
            // the old user object has been retained by CCNode
            old->release();
        }
        return meta;
    }

    FieldContainer* getFieldContainer() {
        return m_fieldContainer;
    }
};

// proxy forwards
class $modify(ProxyCCNode, CCNode) {
    virtual CCObject* getUserObject() {
        return GeodeNodeMetadata::set(this)->m_userObject;
    }
    virtual void setUserObject(CCObject* obj) {
        GeodeNodeMetadata::set(this)->m_userObject = obj;
    }
};

// not const because might modify contents
FieldContainer* CCNode::getFieldContainer() {
    return GeodeNodeMetadata::set(this)->getFieldContainer();
}

std::string CCNode::getID() {
    return GeodeNodeMetadata::set(this)->m_id;
}

void CCNode::setID(std::string const& id) {
    GeodeNodeMetadata::set(this)->m_id = id;
}

CCNode* CCNode::getChildByID(std::string const& id) {
    for (auto child : CCArrayExt<CCNode>(m_pChildren)) {
        if (child->getID() == id) {
            return child;
        }
    }
    return nullptr;
}

CCNode* CCNode::getChildByIDRecursive(std::string const& id) {
    if (auto child = this->getChildByID(id)) {
        return child;
    }
    for (auto child : CCArrayExt<CCNode>(m_pChildren)) {
        if ((child = child->getChildByIDRecursive(id))) {
            return child;
        }
    }
    return nullptr;
}

#pragma warning(pop)