using UnityEngine;

[ExecuteAlways]
[RequireComponent(typeof(RectTransform))]
[RequireComponent(typeof(BoxCollider2D))]
public class MatchRectToCollider : MonoBehaviour
{
    RectTransform rt;
    BoxCollider2D col;

    void Awake()
    {
        rt = GetComponent<RectTransform>();
        col = GetComponent<BoxCollider2D>();
    }

    void UpdateCollider()
    {
        if (rt == null || col == null) return;

        col.size = rt.rect.size;
        col.offset = rt.rect.center;
    }

    void Start()
    {
        UpdateCollider();
    }

    void Update()
    {
        if (rt.hasChanged)
        {
            UpdateCollider();
            rt.hasChanged = false;
        }
    }

    void OnValidate()
    {
        rt = GetComponent<RectTransform>();
        col = GetComponent<BoxCollider2D>();
        UpdateCollider();
    }
}