/// <summary>
/// Destroy GameObject and remove from cache specific instance of DragElement
/// </summary>
/// <param name="dragElement"></param>
public void Destroy(DragElement dragElement)
{
if (!DragElementsCache.ContainsKey(dragElement.Id))
{
Destroy(dragElement.gameObject);
return;
}
Destroy(DragElementsCache[dragElement.Id].gameObject);
DragElementsCache.Remove(dragElement.Id);
}
/// <summary>
/// Attach events and Cache specific DragElement in <see cref="DragElementsCache"/>
/// </summary>
/// <param name="dragElement"></param>
public void CacheDragElement(DragElement dragElement)
{
PrepareDragEvents(dragElement);
if (!DragElementsCache.ContainsKey(dragElement.Id))
{
DragElementsCache.Add(dragElement.Id, null);
}
DragElementsCache[dragElement.Id] = dragElement;
DragElementsCache[dragElement.Id].IsCached = true;
}
/// <summary>
/// Add new GameObject with attached DragElement on specific place in hierarchy.
/// </summary>
/// <param name="parent">Parent for new GameObject.</param>
/// <param name="prefab">Original object to copy.</param>
/// <param name="name">Specific name for new Game object.</param>
/// <returns>Created instance of DragElement.</returns>
public DragElement AddDragElement(Transform parent, DragElement prefab = null, string name = "NewDragElement")
{
DragElement dragElement;
if (prefab == null)
{
dragElement = new GameObject(name, typeof(RectTransform), typeof(DragElement)).GetComponent <DragElement>();
}
else
{
dragElement = Instantiate(prefab, parent);
dragElement.name = name;
}
dragElement.transform.SetParent(parent);
CacheDragElement(dragElement);
return(dragElement);
}
/// <summary>
/// Trigger event when drag is beginning.
/// </summary>
/// <param name="eventData">Data from that event.</param>
public void OnBeginDrag(PointerEventData eventData)
{
if (cloneOnDragging)
{
// This element is in the toolbox
DragElement cloned = Instantiate(this.gameObject, this.TransformCache.parent).GetComponent <DragElement>();
cloned.TransformCache.SetSiblingIndex(this.TransformCache.GetSiblingIndex());
cloned.name = this.name;
// This element is the dragging element
this.cloneOnDragging = false;
this.isClonning = true;
}
this.IsDragging = true;
this.LastPosition = this.TransformCache.position;
this.GetComponent <Graphic>().raycastTarget = false;
this.OnBeginDragCallback?.Invoke();
}
/// <summary>
/// Attach on specific DragElement all officially drag events.
/// </summary>
/// <param name="dragElement">Specific DragElement for preparing.</param>
private void PrepareDragEvents(DragElement dragElement)
{
dragElement.OnBeginDragCallback = () => { LoadBeginDragEvents(dragElement); };
dragElement.OnDragCallback = () => LoadDragEvents();
dragElement.OnEndDragCallback = () => LoadEndDragEvents();
void LoadBeginDragEvents(DragElement element)
{
SelectedDragElement = element;
SelectedDragElement.TransformCache.SetParent(transform);
// Make all DragElements transparent
foreach (var entry in DropObjectsCache)
{
DropObject dropObject = entry.Value;
dropObject.GetComponent <Graphic>().raycastTarget = false;
}
onBeginDrag.Invoke();
}
void LoadDragEvents()
{
onDrag.Invoke();
// Revert all DragElements transparent
foreach (var entry in DropObjectsCache)
{
DropObject dropObject = entry.Value;
dropObject.GetComponent <Graphic>().raycastTarget = true;
}
}
void LoadEndDragEvents()
{
if (SelectedDragElement.isClonning)
{
if (HoveredDropObject != null)
{
if (HoveredDropObject.isEmpty)
{
SelectedDragElement.PlaceOnDropObject(HoveredDropObject);
Debug.Log("Cloning: HoveredDropObject : Empty");
}
else
{
SelectedDragElement.DestroyWithAnimation();
Debug.Log("Cloning: HoveredDropObject : Not empty");
}
}
else if (HoveredDropObject == null)
{
SelectedDragElement.DestroyWithAnimation();
Debug.Log("Cloning: HoveredDropObject : NULL");
}
}
else
{
if (HoveredDropObject != null)
{
if (HoveredDropObject.isEmpty)
{
SelectedDragElement.PlaceOnDropObject(HoveredDropObject);
Debug.Log("Grid: HoveredDropObject : Empty");
}
else
{
SelectedDragElement.ReturnWithAnimation();
Debug.Log("Grid: HoveredDropObject : Not empty");
}
}
else if (HoveredDropObject == null)
{
SelectedDragElement.DestroyWithoutAnimation();
Debug.Log("Grid: HoveredDropObject : NULL");
}
}
LastSelectedDragElement = SelectedDragElement;
SelectedDragElement = null;
onEndDrag.Invoke();
}
}