97 lines
3.2 KiB
C#
97 lines
3.2 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.EventSystems;
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namespace CHN
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{
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public class Dragger : MonoBehaviour, IBeginDragHandler, IDragHandler
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{
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[Header("Resources")]
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public RectTransform dragArea;
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public RectTransform dragObject;
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[Header("Settings")]
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public bool topOnDrag = true;
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private Vector2 originalLocalPointerPosition;
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private Vector3 originalPanelLocalPosition;
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public void Awake()
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{
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if (dragArea == null)
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{
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try
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{
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var canvas = transform.GetComponentInParent<Canvas>();
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dragArea = canvas.GetComponent<RectTransform>();
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}
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catch { Debug.LogError("<b>[Movable Window]</b> Drag Area has not been assigned."); }
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}
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}
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private RectTransform DragObjectInternal
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{
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get
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{
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if (dragObject == null) { return (transform as RectTransform); }
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else { return dragObject; }
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}
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}
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private RectTransform DragAreaInternal
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{
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get
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{
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if (dragArea == null)
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{
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RectTransform canvas = transform as RectTransform;
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while (canvas.parent != null && canvas.parent is RectTransform) { canvas = canvas.parent as RectTransform; }
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return canvas;
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}
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else { return dragArea; }
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}
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}
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public void OnBeginDrag(PointerEventData data)
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{
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if (!Input.GetMouseButton(0))
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return;
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originalPanelLocalPosition = DragObjectInternal.localPosition;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(DragAreaInternal, data.position, data.pressEventCamera, out originalLocalPointerPosition);
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gameObject.transform.SetAsLastSibling();
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if (topOnDrag == true) { dragObject.transform.SetAsLastSibling(); }
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}
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public void OnDrag(PointerEventData data)
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{
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if (!Input.GetMouseButton(0))
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return;
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Vector2 localPointerPosition;
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle(DragAreaInternal, data.position, data.pressEventCamera, out localPointerPosition))
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{
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Vector3 offsetToOriginal = localPointerPosition - originalLocalPointerPosition;
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DragObjectInternal.localPosition = originalPanelLocalPosition + offsetToOriginal;
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}
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ClampToArea();
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}
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private void ClampToArea()
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{
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Vector3 pos = DragObjectInternal.localPosition;
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Vector3 minPosition = DragAreaInternal.rect.min - DragObjectInternal.rect.min;
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Vector3 maxPosition = DragAreaInternal.rect.max - DragObjectInternal.rect.max;
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pos.x = Mathf.Clamp(DragObjectInternal.localPosition.x, minPosition.x, maxPosition.x);
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pos.y = Mathf.Clamp(DragObjectInternal.localPosition.y, minPosition.y, maxPosition.y);
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DragObjectInternal.localPosition = pos;
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}
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}
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}
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