Component.h

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#pragma once
#include "../Core/Config.h"
 
namespace Shit {
    class GameObject; // 前向声明

    class SHIT_API Component {
        friend class GameObject; // 只能通过GameObject初始化组件
 
    public:
        Component();
        virtual ~Component() = default;
 
        virtual void onCreate() {}   // 组件创建时（有 owner，但可能尚未挂到场景）
        virtual void onAttach() {}   // 组件挂载到活动场景时
        virtual void onDetach() {}   // 组件从场景卸下时
        virtual void onDestroy() {}  // 组件销毁时
 
        // 禁止拷贝和移动
        Component(const Component&) = delete;
        Component& operator=(const Component&) = delete;
        Component(Component&&) = delete;
        Component& operator=(Component&&) = delete;
 
        GameObject* getOwner() const { return m_owner; }
        bool isRegistered() const { return m_isRegistered; }
 
    private:
        // 只允许 GameObject 设置
        inline void setOwner(GameObject* owner) { m_owner = owner; }
 
    protected:
        GameObject* m_owner = nullptr; // 组件的拥有者
        bool m_isRegistered = false;
    };
}