[Unity] UI드래그로 이동 시킬 때 범위 제한

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class UnitContent : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler
{
    // 부모 그리드 레이아웃 그룹
    [SerializeField]private GridLayoutGroup parentGroup;
    // 드래그 제한 범위
    [SerializeField] private RectTransform dragArea;
    private PointerEventData currentEventData;

    public void OnBeginDrag(PointerEventData eventData)
    {
        currentEventData = eventData;
    }

    public void OnDrag(PointerEventData eventData)
    {       
        Vector2 localPointPos = dragArea.InverseTransformPoint(eventData.position);

        if(dragArea.rect.Contains(localPointPos))
        {
            transform.position = eventData.position;
        }
        else if (dragArea.rect.Contains(new Vector2(dragArea.rect.center.x, localPointPos.y)))
        {
            transform.position = new Vector2(transform.position.x, eventData.position.y);
        }
        else if (dragArea.rect.Contains(new Vector2(localPointPos.x, dragArea.rect.center.y)))
        {
            transform.position = new Vector2(eventData.position.x, transform.position.y);
        }
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        // 부모 레이아웃 그룹 재정렬
        parentGroup.SetLayoutVertical();
        parentGroup.SetLayoutHorizontal();
    }
}

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결과물