using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class ResizableUI : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler
{
    public RectTransform targetRectTransform; // 需要调整大小的目标物体
    private float originalWidth;
    private Vector2 originalMousePosition;

    void Start()
    {
        // 如果没有指定目标物体，默认使用自身
        if (targetRectTransform == null)
        {
            targetRectTransform = GetComponent<RectTransform>();
        }
        originalWidth = targetRectTransform.rect.width;
    }

    // 当鼠标按下时记录初始的鼠标位置
    void IBeginDragHandler.OnBeginDrag(PointerEventData eventData)
    {
        originalMousePosition = Input.mousePosition;
    }

    // 持续拖动时调整物体宽度
    void IDragHandler.OnDrag(PointerEventData eventData)
    {
        float mouseDelta = Input.mousePosition.x - originalMousePosition.x;
        float newWidth = Mathf.Max(originalWidth + mouseDelta, 10f); // 最小宽度设置为10
        targetRectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, newWidth);
    }

    // 拖动结束时更新原始宽度
    void IEndDragHandler.OnEndDrag(PointerEventData eventData)
    {
        originalWidth = targetRectTransform.rect.width;
    }
}