public virtual void OnBeginDrag(PointerEventData eventData)
{
if (draggedItem == null)
{
draggedItem = this.transform.parent.parent.gameObject; //need to get the whole line as dragged item
}
dropZone = draggedItem.transform.parent;
startingSiblingIndex = draggedItem.transform.GetSiblingIndex();
dragHandleOffset = this.transform.position - draggedItem.transform.position;
placeholder = new GameObject();
placeholder.transform.SetParent(draggedItem.transform.parent);
placeholder.transform.SetSiblingIndex(startingSiblingIndex);
var rt = placeholder.AddComponent <RectTransform>();
rt.pivot = Vector2.zero;
var le = placeholder.AddComponent <LayoutElement>();
le.preferredHeight = startingHeight = GetDraggedItemHeight();
//le.flexibleWidth = 1;
animationHelper = draggedItem.AddComponent <UIAnimationHelper>();
animationHelper.SetHeight = SetPlaceholderHeight;
animationHelper.SetPosition = SetDraggedItemPosition;
animationHelper.AnimateHeight(le.preferredHeight, PLACEHOLDER_MIN_HEIGHT, 0.1f);
var cg = draggedItem.AddComponent <CanvasGroup>();
cg.blocksRaycasts = false;
draggedItemBG = draggedItem.AddComponent <Image>();
draggedItemBG.sprite = background;
draggedItemBG.type = Image.Type.Sliced;
draggedItemBG.color = Color.white;
draggedItemBG.fillCenter = true;
draggedItem.transform.SetParent(mainCanvas.transform);
Debug.Log("OnBeginDrag: draggedItem.name = " + draggedItem.name + ", dropZone.name" + dropZone.name);
}