/// <summary>
/// Uses event system to raycast to all UI elements as the elemnt is being dragged.
/// </summary>
/// <returns></returns>
private IEnumerator DropcastHover()
{
_originParent = dynamicTransform.parent;
originalDepositArea = _activeDepositArea;
while (true)
{
// Raycast with even system
_currentDropcastData = new PointerEventData(EventSystem.current)
{
position = Input.mousePosition
};
EventSystem.current.RaycastAll(_currentDropcastData, _dropcastResults);
// Act on raycast results
if (_dropcastResults.Count == 0 && _activeDepositArea != null)
{
OnNullDropcast();
}
else
{
foreach (RaycastResult result in _dropcastResults)
{
DepositArea d = result.gameObject.GetComponent <DepositArea>();
if (d != null)
{
if (d.gameObject != gameObject)
{
if (d != _activeDepositArea)
{
if (_activeDepositArea != null)
{
_activeDepositArea.OnDroppableRaycastReceiveExit(this);
OnDragElementContainerHoverExit(_activeDepositArea, d);
}
_activeDepositArea = d;
_activeDepositArea.OnDroppableRaycastReceiveEnter(this);
OnDragElementContainerHoverEnter(_activeDepositArea);
}
else
{
_activeDepositArea.OnDroppableRaycastReceiveStay(this);
}
}
break;
}
else
{
dynamicTransform.SetParent(result.gameObject.transform);
OnNullDropcast();
}
}
}
yield return(null);
}
}
/// <summary>
///
/// </summary>
private void OnNullDropcast()
{
if (_activeDepositArea != null)
{
_activeDepositArea.OnDroppableRaycastReceiveExit(this);
OnDragElementContainerHoverExit(_activeDepositArea, null);
}
_activeDepositArea = null;
}
public virtual void OnDragElementContainerHoverEnter(DepositArea container)
{
dynamicTransform.SetParent(container.depositAreaTransform);
// Inform decorators
foreach (IDropElementEventReceivable d in _decorators)
{
d.OnDragElementContainerHoverEnter(container);
}
}
public virtual void OnDragElementContainerHoverExit(DepositArea outContainer, DepositArea inContainer)
{
dynamicTransform.SetParent(_defaultParent);
dynamicTransform.localScale = _defaultScale;
// Inform decorators
foreach (IDropElementEventReceivable d in _decorators)
{
d.OnDragElementContainerHoverExit(outContainer, inContainer);
}
}
public virtual void OnDragElementDrop(DepositArea container)
{
// Cancel any momentum we may have after dragging
if (container != null &&
_originParent != container.depositAreaTransform &&
_rectIsSlidingWithMomentum)
{
_rectIsSlidingWithMomentum = false;
StopCoroutine(nameof(OnMomentumSlideFrame));
}
// If we drop out of the area we were previously in, we need to inform that area
if (originalDepositArea != null && _activeDepositArea != originalDepositArea)
{
originalDepositArea.OnDroppableRemove(this);
}
dynamicTransform.localScale = _defaultScale;
// Inform decorators
foreach (IDropElementEventReceivable d in _decorators)
{
d.OnDragElementDrop(container);
}
}
protected virtual void Awake()
{
_depositArea = GetComponent <DepositArea>();
}
public virtual void OnDragElementDrop(DepositArea container)
{
}
public virtual void OnDragElementContainerHoverExit(DepositArea outContainer, DepositArea inContainer)
{
}
public virtual void OnDragElementContainerHoverEnter(DepositArea container)
{
}