87 lines
2.1 KiB
C#
87 lines
2.1 KiB
C#
using UnityEngine;
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using System.Collections.Generic;
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/// <summary>
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/// UI拖动组管理器，用于限制同时只能拖动一个UI元素
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/// </summary>
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public class UIDragGroup : MonoBehaviour
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{
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private static UIDragGroup instance;
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private HashSet<UIDragHandler> dragHandlers = new HashSet<UIDragHandler>();
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private UIDragHandler activeDragHandler = null;
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private void Awake()
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{
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if (instance == null)
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{
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instance = this;
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DontDestroyOnLoad(gameObject);
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}
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else
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{
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Destroy(gameObject);
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}
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}
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/// <summary>
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/// 注册拖动处理器
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/// </summary>
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public static void RegisterDragHandler(UIDragHandler handler)
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{
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if (instance != null)
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{
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instance.dragHandlers.Add(handler);
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}
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}
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/// <summary>
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/// 取消注册拖动处理器
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/// </summary>
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public static void UnregisterDragHandler(UIDragHandler handler)
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{
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if (instance != null)
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{
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instance.dragHandlers.Remove(handler);
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if (instance.activeDragHandler == handler)
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{
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instance.activeDragHandler = null;
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}
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}
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}
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/// <summary>
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/// 开始拖动处理
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/// </summary>
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public static bool BeginDrag(UIDragHandler handler)
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{
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if (instance == null) return true;
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// 如果已有活动的拖动处理器且不是当前处理器，则拒绝拖动
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if (instance.activeDragHandler != null && instance.activeDragHandler != handler)
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{
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return false;
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}
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instance.activeDragHandler = handler;
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return true;
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}
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/// <summary>
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/// 结束拖动处理
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/// </summary>
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public static void EndDrag(UIDragHandler handler)
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{
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if (instance != null && instance.activeDragHandler == handler)
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{
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instance.activeDragHandler = null;
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}
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}
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private void OnDestroy()
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{
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if (instance == this)
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{
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instance = null;
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}
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}
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} |