94 lines
2.5 KiB
C#
94 lines
2.5 KiB
C#
using System;
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using UnityEngine;
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using UnityEngine.EventSystems;
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using UnityEngine.Serialization;
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public class UIElementDragger : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
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{
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[SerializeField]
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private Target m_Target;
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[SerializeField]
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private Transform m_CustomTarget;
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[FormerlySerializedAs("ex2")]
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[SerializeField]
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private bool m_UseCanvasScale;
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private Canvas _canvas;
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private RectTransform _rectTransform;
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private void OnEnable()
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{
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_rectTransform = GetComponent<RectTransform>();
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_canvas = GetComponentInParent<Canvas>();
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}
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public void OnBeginDrag(PointerEventData eventData)
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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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var delta = (Vector3)GetLocalDelta(eventData.delta);
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switch (m_Target)
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{
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case Target.Self:
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_rectTransform.localPosition += delta;
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break;
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case Target.Parent:
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_rectTransform.parent.localPosition += delta;
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break;
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case Target.Custom:
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_rectTransform.localPosition += delta;
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if (m_CustomTarget)
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{
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if (m_UseCanvasScale)
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{
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delta.Scale(_canvas.rootCanvas.transform.localScale);
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}
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m_CustomTarget.localPosition += delta;
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}
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break;
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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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}
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private Vector2 GetLocalDelta(Vector2 evDelta)
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{
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switch (_canvas.renderMode)
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{
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case RenderMode.ScreenSpaceOverlay:
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{
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var zero = transform.InverseTransformPoint(Vector2.zero);
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var delta = transform.InverseTransformPoint(evDelta);
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return delta - zero;
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}
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case RenderMode.ScreenSpaceCamera:
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case RenderMode.WorldSpace:
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{
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RectTransformUtility.ScreenPointToLocalPointInRectangle(_rectTransform, Vector2.zero,
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_canvas.worldCamera, out var zero);
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RectTransformUtility.ScreenPointToLocalPointInRectangle(_rectTransform, evDelta,
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_canvas.worldCamera, out var delta);
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return delta - zero;
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}
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default:
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throw new NotSupportedException();
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}
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}
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private enum Target
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{
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Self,
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Parent,
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Custom
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}
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}
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