/// <summary>
/// This event is automatically fired automatically
/// as this object is a MonoBehaviour. If the event
/// is already used, or there is an item already
/// being dragged, will do nothing.
/// </summary>
/// <param name="eventData">The `PointerEventData` of the event</param>
public void OnBeginDrag(PointerEventData eventData)
{
if ((eventData != null && eventData.used) || DraggedItem != null)
{
return;
}
if (OnBeginDragCallback != null)
{
OnBeginDragCallback(eventData);
}
DraggedItem = this;
canvasGroup.blocksRaycasts = false;
oldSlot = GetComponentInParent <Slot>();
oldSlot.RemoveItem();
// place it in the parent canvas so
// it renders above everything else
transform.SetParent(canvas.transform);
beingDragged = true;
// trigger the item did get picked up event
ItemEventManager.TriggerItemDidPickup(gameObject, eventData);
}
private void Awake()
{
if (Instance == null)
{
Instance = this;
DontDestroyOnLoad(gameObject);
}
else
{
Destroy(gameObject);
}
StartCoroutine(GetItemDataFromServer());
}
/// <summary>
/// Called when the item stops being dragged.
/// Will get called _after_ `OnDrop` (which `Slot`
/// implements). Will trigger the `ItemDidInvalidDrop`
/// event if the item wasn't dropped successfully.
/// </summary>
/// <param name="eventData">The `PointerEventData` of the event</param>
public void OnEndDrag(PointerEventData eventData)
{
// OnEndDrag can be triggered via mouse down
// or mouse up, if there is no currently dragged
// item the event has already been fired
if (DraggedItem == null)
{
return;
}
DraggedItem = null;
// if this item is still in the canvas transform
// that means the drop was unsuccessful- trigger
// the ItemDidDrop event
if (transform.parent == canvas.transform)
{
transform.position = oldSlot.transform.position;
transform.SetParent(oldSlot.transform);
oldSlot.AddItem(this);
if (!eventData.used)
{
ItemEventManager.TriggerItemDidInvalidDrop(gameObject, oldSlot, eventData);
}
}
oldSlot = null;
canvasGroup.blocksRaycasts = true;
beingDragged = false;
// trigger necessary events
if (OnEndDragCallback != null)
{
OnEndDragCallback(eventData);
}
ItemEventManager.TriggerItemDidDrop(gameObject, eventData);
}
