81 lines
2.0 KiB
C#
81 lines
2.0 KiB
C#
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using UnityEngine;
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using UnityEngine.Events;
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using UnityEngine.EventSystems;
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/// <summary>
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/// 接受拖动操作的Ui底层组件，Unity原生接口需要额外处理一些释放的问题
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/// </summary>
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public class UiDragComponent : MonoBehaviour, IDragHandler, IPointerDownHandler, IPointerUpHandler
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{
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/// <summary>
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/// 当前操作的手指Id
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/// </summary>
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public int? CurrentPointerId { get; private set; }
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/// <summary>
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/// 上次移动的缓存位置
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/// </summary>
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public Vector2 lastPoint { get; private set; }
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/// <summary>
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/// 手指从一点移动到下一点
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/// </summary>
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public event UnityAction<Vector2, Vector2> onDrag;
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/// <summary>
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/// 手指按下操作
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/// </summary>
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public event UnityAction<Vector2> onPress;
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/// <summary>
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/// 手指抬起操作
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/// </summary>
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public event UnityAction<Vector2> onUp;
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private void OnDisable()
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{
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Release();
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}
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private void OnApplicationFocus(bool hasFocus)
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{
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if (!hasFocus)
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Release();
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}
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public void OnPointerDown(PointerEventData eventData)
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{
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if (CurrentPointerId == null)
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{
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CurrentPointerId = eventData.pointerId;
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lastPoint = eventData.position;
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if (onPress != null)
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onPress(lastPoint);
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}
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}
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public void OnDrag(PointerEventData eventData)
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{
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if (CurrentPointerId == eventData.pointerId)
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{
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if (onDrag != null)
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onDrag(lastPoint, eventData.position);
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lastPoint = eventData.position;
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}
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}
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public void OnPointerUp(PointerEventData eventData)
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{
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if (CurrentPointerId == eventData.pointerId)
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{
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lastPoint = eventData.position;
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Release();
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}
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}
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public void Release()
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{
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var temp = CurrentPointerId;
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CurrentPointerId = null;
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if (temp != null)
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{
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if (onUp != null)
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onUp(lastPoint);
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}
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}
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}
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