/// <summary>
/// Grab the best suited handler for dragging.
/// </summary>
/// <param name="wrapper"></param>
/// <param name="eventData"></param>
/// <returns></returns>
private static DragHandlerBase FindBestDragHandler(ItemCollectionSlotUIBase wrapper, PointerEventData eventData)
{
DragHandlerBase best = null;
foreach (var handler in dragHandlers)
{
if (handler.CanUse(wrapper, eventData) && (best == null || handler.priority > best.priority))
{
best = handler;
}
}
return(best);
}
public static UIDragModel OnBeginDrag(ItemCollectionSlotUIBase originalWrapper, PointerEventData eventData)
{
if (draggingItem != null)
{
Debug.LogWarning("Item still attached to cursor, can only drag one item at a time", draggingItem.gameObject);
return(null); // Can only drag one item at a time
}
currentDragHandler = FindBestDragHandler(originalWrapper, eventData);
if (currentDragHandler == null)
{
return(null);
}
var toDrag = CreateDragObject(originalWrapper);
var lookup = currentDragHandler.OnBeginDrag(toDrag, eventData);
if (OnStartDragging != null)
{
OnStartDragging(lookup, toDrag, eventData);
}
return(lookup);
}