using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
[RequireComponent(typeof(Image))]
public class DragMe : MonoBehaviour, IBeginDragHandler, IDragHandler,IEndDragHandler
{
public bool dragOnSurfaces =
true;
public GameObject m_DraggingIcon;
private RectTransform m_DraggingPlane;
public void OnBeginDrag(PointerEventData eventData)
{
var canvas = FindInParents<Canvas>
(gameObject);
if (canvas ==
null)
return;
// We have clicked something that can be dragged.
// What we want to do is create an icon for this.
m_DraggingIcon =
new GameObject(
"icon");
m_DraggingIcon.transform.SetParent(canvas.transform, false);
m_DraggingIcon.transform.SetAsLastSibling();
var image = m_DraggingIcon.AddComponent<Image>
();
// The icon will be under the cursor.
// We want it to be ignored by the event system.
CanvasGroup group = m_DraggingIcon.AddComponent<CanvasGroup>
();
group.blocksRaycasts =
false;
image.sprite = GetComponent<Image>
().sprite;
image.SetNativeSize();
if (dragOnSurfaces)
{
m_DraggingPlane = transform
as RectTransform;
}
else
{
m_DraggingPlane = canvas.transform
as RectTransform;
}
SetDraggedPosition(eventData);
}
public void OnDrag(PointerEventData data)
{
if (m_DraggingIcon !=
null)
{
SetDraggedPosition(data);
}
transform.position =
m_DraggingIcon.transform.position;
m_DraggingIcon.SetActive(false);
}
private void SetDraggedPosition(PointerEventData data)
{
if (dragOnSurfaces && data.pointerEnter !=
null && data.pointerEnter.transform
as RectTransform !=
null)
{
m_DraggingPlane = data.pointerEnter.transform
as RectTransform;
}
var rt = m_DraggingIcon.GetComponent<RectTransform>
();
Vector3 globalMousePos;
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(m_DraggingPlane, data.position, data.pressEventCamera,
out globalMousePos))
{
rt.position =
globalMousePos;
rt.rotation =
m_DraggingPlane.rotation;
}
}
public void OnEndDrag(PointerEventData eventData)
{
if (m_DraggingIcon !=
null)
Destroy(m_DraggingIcon);
Debug.Log("万用表的位置"+
transform.position);
}
static public T FindInParents<T>(GameObject go)
where T : Component
{
if (go ==
null)
{
return null;
}
var comp = go.GetComponent<T>
();
if (comp !=
null)
{
return comp;
}
Transform t =
go.transform.parent;
while (t !=
null && comp ==
null)
{
comp = t.gameObject.GetComponent<T>
();
t =
t.parent;
}
return comp;
}
}
转载于:https://www.cnblogs.com/Cocomo/p/5753345.html
相关资源：25个经典网站源代码
