void ReplaceDropTarget(DragDropTarget oldTarget, DragDropTarget newTarget)
{
if (oldTarget == newTarget)
{
return;
}
if (oldTarget)
{
oldTarget.OnItemExit(currentEventData);
OnItemExit(currentEventData);
}
currentEventData.target = newTarget;
if (newTarget)
{
newTarget.OnItemEnter(currentEventData);
OnItemEnter(currentEventData);
}
}
public void OnPointerDown(PointerEventData eventData)
{
DragDropEventData.current.Reset();
scrollRect = DragDropHelper.FindComponentUpward <ScrollRect>(transform);
DragDropEventData.current.item = this;
DragDropEventData.current.eligibleForClick = true;
if (attachedTarget)
{
lastTarget = attachedTarget;
}
else
{
Debug.LogError("will detach from a non-target parent");
}
if (delayDetach && !freeItem)
{
StartCoroutine(DelayHandleDragDropEvent());
}
}
public static bool TryRemoveItem(DragDropItem item, DragDropTarget target)
{
if (item.attachedTarget == target && target.HasItemAttached(item))
{
DragDropEventData eventData = new DragDropEventData();
eventData.Reset();
eventData.external = true;
eventData.target = target;
eventData.item = item;
target.OnItemDetach(eventData);
item.OnItemDetach(eventData);
target.OnItemExit(eventData);
item.OnItemExit(eventData);
item.OnSetFree(eventData);
return(true);
}
else
{
return(false);
}
}
public void OnPointerDown(PointerEventData eventData)
{
currentEventData.Reset();
scrollRect = DragDropHelper.FindComponentUpward <ScrollRect>(transform);
currentEventData.item = this;
currentEventData.eligibleForClick = true;
if (attachedTarget)
{
lastTarget = attachedTarget;
lastParent = attachedTarget.targetParent;
}
else
{
lastParent = transform.parent;
}
if (delayDetach && !freeItem)
{
StartCoroutine(DelayHandleDragDropEvent());
}
}
public static bool TryRemoveItem(DragDropItem item, DragDropTarget target, bool sendCallback = true)
{
if (item == null || target == null)
{
return(false);
}
if (item.attachedTarget == target && target.HasItemAttached(item))
{
DragDropEventData eventData = new DragDropEventData(!sendCallback);
eventData.Reset();
eventData.target = target;
eventData.item = item;
target.OnItemDetach(eventData);
item.OnItemDetach(eventData);
item.OnSetFree(eventData);
return(true);
}
else
{
return(false);
}
}
public void OnDrag(PointerEventData eventData)
{
if (!HandlingDragDropEvent())
{
return;
}
if (rectTransform)
{
Vector3 pointerPos;
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(rectTransform, eventData.position, eventData.pressEventCamera, out pointerPos))
{
rectTransform.position = pointerPos;
}
}
DragDropTarget newTarget = DragDropRegistry.Instance.FindDropTarget(eventData, this);
if (newTarget != DragDropEventData.current.target)
{
ReplaceDropTarget(DragDropEventData.current.target, newTarget);
}
}
public LinkedListNode <DragDropTarget> Register(DragDropTarget target)
{
return(managedTargets.AddLast(target));
}
public static bool IsChannelMatch(DragDropTarget target, DragDropItem item)
{
return((target.matchingChannel & item.matchingChannel) != 0);
}
public static bool InitializePair(DragDropItem item, DragDropTarget target)
{
item.SetInitialTarget(target);
return(true);
}
