public static bool TryAddItem(DragDropItem item, DragDropTarget target)
{
if (item.attachedTarget != null)
{
return(false);
}
if (!IsChannelMatch(target, item))
{
return(false);
}
if (target.currentItemCount >= target.maxItemCount)
{
return(false);
}
DragDropEventData eventData = new DragDropEventData();
eventData.Reset();
eventData.external = true;
eventData.target = target;
eventData.item = item;
target.OnItemEnter(eventData);
item.OnItemEnter(eventData);
target.OnItemAttach(eventData);
item.OnItemAttach(eventData);
return(true);
}
void ReplaceDropTarget(DragDropTarget oldTarget, DragDropTarget newTarget)
{
if (oldTarget == newTarget)
{
return;
}
if (oldTarget)
{
oldTarget.OnItemExit(DragDropEventData.current);
OnItemExit(DragDropEventData.current);
}
DragDropEventData.current.target = newTarget;
if (newTarget)
{
newTarget.OnItemEnter(DragDropEventData.current);
OnItemEnter(DragDropEventData.current);
}
}