Unity 拖拽UGUI窗口

2024年4月10日 78次阅读 来源: Dore__ 
using UnityEngine;
using UnityEngine.EventSystems;

/// <summary>
/// UI拖拽
/// </summary>
public class DragUI : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    /// <summary>
    /// 拖拽对象  
    /// </summary>
    public Transform _Target;//可拖拽区域

    /// <summary>
    /// 拖拽对象RectTransform
    /// </summary>
    public RectTransform _TargetRect;//整个窗口

    private bool isDrag;

    private Vector3 offset;

    public void OnBeginDrag(PointerEventData eventData)
    {
        isDrag = false;
        SetDragObjPostion(eventData);
        _TargetRect.transform.SetSiblingIndex(1);
    }

    public void OnDrag(PointerEventData eventData)
    {
        isDrag = true;
        SetDragObjPostion(eventData);
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        SetDragObjPostion(eventData);
    }

    void SetDragObjPostion(PointerEventData eventData)
    {

        Vector3 mouseWorldPosition;

        //判断是否点到UI图片上的时候
        if (RectTransformUtility.ScreenPointToWorldPointInRectangle(_TargetRect, eventData.position, eventData.pressEventCamera, out mouseWorldPosition))
        {
            if (isDrag)
            {
                _TargetRect.position = mouseWorldPosition + offset;
            }
            else
            {
                //计算偏移量
                offset = _TargetRect.position - mouseWorldPosition;
            }
        }
    }
}

    原文作者：Dore__
    原文地址: https://blog.csdn.net/Dore__/article/details/123351695
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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