public void OnDrag(PointerEventData eventData)
{
// move the dragged object with the mouse
if (dragging)
{
transform.position = eventData.position;
}
// highlight squares that can receive this component?
Slot slot = GetSlotUnderMouse();
if (slot != currentSlotOver)
{
if (slot)
{
slot.OnDraggableEnter();
}
if (currentSlotOver)
{
currentSlotOver.OnDraggableExit();
}
ObjectContainer oldContainer = currentSlotOver != null ? currentSlotOver.container : null;
ObjectContainer newContainer = slot != null ? slot.container : null;
if (oldContainer != null)
{
oldContainer.OnDraggableExit();
}
if (newContainer != null)
{
newContainer.OnDraggableEnter();
}
currentSlotOver = slot;
}
}
public void OnEndDrag(PointerEventData eventData)
{
if (!dragging)
{
return;
}
// raycast to find what we're dropping over
Slot target = GetSlotUnderMouse();
ObjectContainer containerTarget = null;
ObjectContainer containerDrag = slot.container;
bool legal = true;
// check that this move is OK with both containers - they can both veto it
if (target)
{
containerTarget = target.container;
// if there is a container and we can't drop into it for game logic reasons, cancel the drag
if (containerTarget != null)
{
legal = containerTarget.CanDrop(this, target);
}
}
// we're Ok to move
if (legal)
{
Slot fromSlot = slot;
SwapWith(target,
containerDrag != null ? containerDrag.IsReadOnly() : true,
containerTarget != null ? containerTarget.IsReadOnly() : true);
// game logic - let both containers know about the update
if (containerTarget != null)
{
containerTarget.Drop(target, containerDrag);
}
if (containerDrag != null)
{
containerDrag.Drop(fromSlot, containerTarget);
}
}
else
{
// allow us to make a sound or anything similar that the rejecting container has specified
containerTarget.onDragFail.Invoke();
}
// return to our parent slot now
transform.SetParent(slot.GetSlot());
dragging = false;
current = null;
// call the dragexit functions when we're placing, to unhighlight everything.
// at the slot level...
if (currentSlotOver)
{
currentSlotOver.OnDraggableExit();
}
// ...and at the container level
ObjectContainer oldContainer = currentSlotOver != null ? currentSlotOver.container : null;
if (oldContainer != null)
{
oldContainer.OnDraggableExit();
}
currentSlotOver = null;
if (canvas)
{
canvas.sortingOrder = 0;
}
}
