/// <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)
{
this.SelectedDragElement = element;
this.SelectedDragElement.TransformCache.SetParent(this.transform);
if (this.HoveredDropObject != null)
{
this.LastDropObject = this.HoveredDropObject;
}
this.onBeginDrag.Invoke();
}
void LoadDragEvents()
{
this.onDrag.Invoke();
}
void LoadEndDragEvents()
{
this.onEndDrag.Invoke();
if (this.HoveredDropObject != null)
{
if (this.HoveredDropObject.isEmpty)
{
this.SelectedDragElement.TransformCache.SetParent(this.HoveredDropObject.TransformCache);
this.SelectedDragElement.TransformCache.localPosition = Vector2.zero;
this.SelectedDragElement.SetLastParent();
this.HoveredDropObject.isEmpty = false;
LastDropObjectSetEmpty(true);
}
else
{
this.SelectedDragElement.ReturnToLastParent();
LastDropObjectSetEmpty(false);
}
}
else if (this.HoveredDropObject == null)
{
this.onDropElementOutside.Invoke();
LastDropObjectSetEmpty(true);
}
this.LastSelectedDragElement = this.SelectedDragElement;
this.SelectedDragElement = null;
}
}
/// <summary>
/// Destroy GameObject and remove from cache specific instance of DragElement
/// </summary>
/// <param name="dragElement"></param>
public void Destroy(DragElement dragElement)
{
if (!this.DragElementsCache.ContainsKey(dragElement.Id))
{
Object.Destroy(dragElement.gameObject);
return;
}
Object.Destroy(this.DragElementsCache[dragElement.Id].gameObject);
this.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 (!this.DragElementsCache.ContainsKey(dragElement.Id))
{
this.DragElementsCache.Add(dragElement.Id, null);
}
this.DragElementsCache[dragElement.Id] = dragElement;
this.DragElementsCache[dragElement.Id].IsCached = true;
}
public static void AddDragElementOnSelected()
{
DragAndDrop dragAndDrop = Selection.activeGameObject.transform.root.GetComponent <DragAndDrop>();
if (dragAndDrop == null)
{
DragAndDrop.Log("Don't have [DragAndDrop] Component in scene. Please assign and try again", DragAndDrop.LogType.Error);
return;
}
DragElement dragElement = dragAndDrop.AddDragElement(Selection.activeGameObject.transform);
Undo.RegisterCreatedObjectUndo(dragElement, "Create DragElement");
}
/// <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);
}
public static void CreateDragAndDropOnSelected()
{
GameObject go = new GameObject("DragAndDropPanel", typeof(RectTransform), typeof(DragAndDrop));
go.transform.SetParent(Selection.activeGameObject.transform);
RectTransform rectTransform = go.GetComponent <RectTransform>();
rectTransform.localScale = Vector2.one;
rectTransform.sizeDelta = new Vector2(400, 200);
DragAndDrop dragAndDrop = go.GetComponent <DragAndDrop>();
GameObject dropObjectContainer = new GameObject("DropObjectContainer", typeof(GridLayoutGroup));
dropObjectContainer.transform.SetParent(dragAndDrop.transform);
rectTransform = dropObjectContainer.GetComponent <RectTransform>();
rectTransform.localScale = Vector2.one;
rectTransform.sizeDelta = new Vector2(400, 200);
DragElement dragElement = dragAndDrop.AddDragElement(dragAndDrop.transform);
dragElement.transform.localScale = Vector2.one;
dragElement.transform.localPosition += new Vector3(0, -200, 0);
Image image = DragAndDrop.AddMissingComponent <Image>(dragElement.gameObject);
image.color = Color.cyan;
DropObject dropObject = dragAndDrop.AddDropObject(dropObjectContainer.transform);
dropObject.transform.localScale = Vector2.one;
image = DragAndDrop.AddMissingComponent <Image>(dropObject.gameObject);
image.color = Color.magenta;
Undo.RegisterCreatedObjectUndo(go, "Create DragAndDrop");
}