76 lines
2.0 KiB
C#
76 lines
2.0 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.EventSystems;
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using UnityEngine.UI;
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/// <summary>
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/// ͨÓÃÍÏק×é¼þ
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/// </summary>
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public class DragUIItem :MonoBehaviour,IDragHandler,IBeginDragHandler,IEndDragHandler
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{
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private RectTransform rectTransform;
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private Canvas canvas;
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private Vector2 startPosition;
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private bool restrictToCanvas = true;
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private LayoutGroup parentLayoutGroup;
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private void Awake()
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{
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rectTransform = GetComponent<RectTransform>();
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canvas = GetComponentInParent<Canvas>();
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startPosition = rectTransform.anchoredPosition;
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parentLayoutGroup = GetComponentInParent<LayoutGroup>();
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}
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public void OnBeginDrag(PointerEventData eventData)
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{
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if (parentLayoutGroup != null)
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parentLayoutGroup.enabled = false;
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parentLayoutGroup.GetComponent<ContentSizeFitter>().enabled = false;
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}
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public void OnDrag(PointerEventData eventData)
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{
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if (RectTransformUtility.ScreenPointToWorldPointInRectangle(
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rectTransform,
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eventData.position,
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canvas.worldCamera,
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out Vector3 worldPosition))
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{
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rectTransform.position = worldPosition;
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if (restrictToCanvas)
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RestrictToCanvasBounds();
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}
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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parentLayoutGroup.enabled = true;
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parentLayoutGroup.GetComponent<ContentSizeFitter>().enabled = true;
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}
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private void RestrictToCanvasBounds()
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{
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Vector3[] corners = new Vector3[4];
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canvas.GetComponent<RectTransform>().GetWorldCorners(corners);
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Vector3 min = corners[0];
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Vector3 max = corners[2];
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Vector3 pos = rectTransform.position;
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pos.x = Mathf.Clamp(pos.x, min.x, max.x);
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pos.y = Mathf.Clamp(pos.y, min.y, max.y);
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rectTransform.position = pos;
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}
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public void ResetPosition()
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{
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rectTransform.anchoredPosition = startPosition;
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}
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}
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