我有一个脚本,用于处理从给定插槽拖动项目。但我想添加一个停止特定项目拖动的功能。我认为最好的地方是在OnBeginDrag
方法中实现,但似乎找不到停止/取消拖动事件本身的方法。以下是我的一部分代码:
public class SlotBehaviour : MonoBehaviour, IDropHandler, IPointerEnterHandler, IPointerExitHandler, IBeginDragHandler, IDragHandler, IEndDragHandler,IPointerClickHandler
{
public void OnBeginDrag(PointerEventData eventData)
{
if (eventData.button != PointerEventData.InputButton.Left)
{
return;
}
if (this.Empty) return;
var canvas = imageItem.canvas;
if (canvas == null) return;
GUIManager.mouseBusy = true;
// 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.
m_DraggingIcon.AddComponent<IgnoreRaycast>();
image.sprite = imageItem.sprite;
image.rectTransform.sizeDelta = imageItem.rectTransform.sizeDelta;
m_DraggingPlane = transform as RectTransform;
SetDraggedPosition(eventData);
}
public void OnDrag(PointerEventData data)
{
if (m_DraggingIcon != null)
SetDraggedPosition(data);
}
private void SetDraggedPosition(PointerEventData data)
{
if (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);
}
GUIManager.mouseBusy = false;
//if you drop it somewhere where its not wanted(or just nowhere)
if (eventData.used == false)
{
if (eventData.pointerCurrentRaycast.gameObject == null)// if its nowhere offer to drop it on ground
{
GUIManager.instance.DropItem((int)ItemsDatabase.container[containerID].items[indexInContainer]);
}
}
}
}
我之前尝试返回这个方法,但它没有做任何事情,可能需要处理事件数据...如果你告诉我如何处理它,我将不胜感激。