scene.h

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#pragma once
 
#include <functional>
#include <vector>
#include <string>
#include <unordered_map>
class GameObject;
 
class SceneNode
{
    friend class SceneTree;
    friend class SceneManager;
 
public:
    SceneNode(GameObject* gameObject);
 
    void addChild(GameObject* child, bool isBackground = false);
 
    const std::vector<SceneNode*> getChildren();
 
    SceneNode* getParent();
 
    GameObject* getGameObject();
 
    bool readyToDestroy();
 
    void setDestroy(bool destroy);
    
    bool isBackground();    
 
    void setIsBackground(bool isBackground);
 
private:
    SceneNode* m_parent; 
    GameObject* m_gameObject; 
    std::vector<SceneNode*> m_children; 
 
    bool m_destroy = false; 
    bool m_isBackground = false; 
 
    ~SceneNode();
};
 
class SceneTree
{
public:
    SceneTree();
 
    ~SceneTree();
 
    void addChild(GameObject* child, bool isBackground = false);
 
    void traverseTree(std::function<void(SceneNode*)> callback);
 
    void traverseTree(SceneNode* node, std::function<void(SceneNode*)> callback);
 
    GameObject* findGameObjectById(std::string id);
 
    std::vector<GameObject*> findGameObjectsByTag(std::string tag);
 
    std::vector<GameObject*>& findCachedGameObjectsInFrame(std::string tag);
 
    void resetCachedGameObjectsInFrame();
 
    int gameStatus();
 
private:
    SceneNode* m_root; 
 
    std::unordered_map<std::string, GameObject*> m_cachedGameObjects; 
    std::unordered_map<std::string, std::vector<GameObject*>> m_cachedGameObjectsInFrame; 
};