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75 lines
2.2 KiB
75 lines
2.2 KiB
using UnityEngine;
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using UnityEngine.EventSystems;
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using UnityEngine.UI;
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[RequireComponent(typeof(Image))]
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public class Dragable : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
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{
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protected GameObject m_DraggingIcon;
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protected RectTransform m_DraggingPlane;
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public virtual void OnBeginDrag(PointerEventData eventData)
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{
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var canvas = FindInParents<Canvas>(gameObject);
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if (canvas == null)
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return;
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// We have clicked something that can be dragged.
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// What we want to do is create an icon for this.
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m_DraggingIcon = new GameObject("icon");
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m_DraggingIcon.transform.SetParent(canvas.transform, false);
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m_DraggingIcon.transform.SetAsLastSibling();
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m_DraggingIcon.layer = LayerMask.NameToLayer("Ignore Raycast");
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var image = m_DraggingIcon.AddComponent<Image>();
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image.sprite = GetComponent<Image>().sprite;
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image.SetNativeSize();
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m_DraggingPlane = canvas.transform as RectTransform;
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SetDraggedPosition(eventData);
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}
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public virtual void OnDrag(PointerEventData data)
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{
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if (m_DraggingIcon != null)
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SetDraggedPosition(data);
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}
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protected virtual void SetDraggedPosition(PointerEventData data)
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{
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var rt = m_DraggingIcon.GetComponent<RectTransform>();
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Vector3 globalMousePos;
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if (RectTransformUtility.ScreenPointToWorldPointInRectangle(m_DraggingPlane, data.position, data.pressEventCamera, out globalMousePos))
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{
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rt.position = globalMousePos;
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rt.rotation = m_DraggingPlane.rotation;
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}
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}
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public virtual void OnEndDrag(PointerEventData eventData)
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{
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Destroy(m_DraggingIcon);
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m_DraggingIcon = null;
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}
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static public T FindInParents<T>(GameObject go) where T : Component
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{
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if (go == null) return null;
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var comp = go.GetComponent<T>();
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if (comp != null)
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return comp;
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Transform t = go.transform.parent;
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while (t != null && comp == null)
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{
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comp = t.gameObject.GetComponent<T>();
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t = t.parent;
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}
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return comp;
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}
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}
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