/// <summary>
/// Attempt to move item from to the destination
/// </summary>
/// <param name="destination"></param>
/// <returns></returns>
private bool AttemptSimpleTransfer(IDragDestination <T> destination, InputButton button)
{
//Debug.Log("In simple transfer");
//Get the current item and number from the source container
var draggingItem = m_source.GetItem();
var draggingNumber = 0;
var maxCanReceive = destination.MaxAcceptable(draggingItem);
if (button == InputButton.Left)
{
draggingNumber = m_source.GetNumber();
}
else
{
draggingNumber = 1;
}
//Determine how many of the item can be transfered based on the destination container
//var maxCanReceive = destination.MaxAcceptable(draggingItem);
var numToTransfer = Mathf.Min(maxCanReceive, draggingNumber);
//If there are items to be transfered, descrease count in source and add # of items to destination.
if (numToTransfer > 0)
{
m_source.RemoveItems(numToTransfer);
destination.AddItems(draggingItem, numToTransfer);
return(false);
}
return(true);
}
private void DropItemIntoContainer(IDragDestination <T> destination)
{
//if the destination is the same as the source
if (object.ReferenceEquals(destination, _itemSource))
{
return;
}
//Gets the IDragContainer of the destination
var destinationContainer = destination as IDragContainer <T>;
var sourceContainer = _itemSource as IDragContainer <T>;
// Swap won't be possible
//if the destination or the source are null
//or the item is null
//or the object of the source and destination are the same
//then attempt a transfer
if (destinationContainer == null || sourceContainer == null ||
destinationContainer.GetItem() == null ||
object.ReferenceEquals(destinationContainer.GetItem(), sourceContainer.GetItem()))
{
AttemptItemTransfer(destination);
return;
}
//if the conditions above are not met then attempt to swap the items
AttemptSwap(destinationContainer, sourceContainer);
}
void IEndDragHandler.OnEndDrag(PointerEventData eventData)
{
//Sets the position to original
transform.position = _startPosition;
//Canvas needs to block raycasts again
GetComponent <CanvasGroup>().blocksRaycasts = true;
//sets us to the original parent
transform.SetParent(_originalParent, true);
//Creates a destination object
IDragDestination <T> container = null;
//if we are not over this current object
if (!EventSystem.current.IsPointerOverGameObject())
{
//set the canvas as our destination
container = _parentCanvas.GetComponent <IDragDestination <T> >();
}
else
{
//Get the container we are hovering over
if (eventData.pointerEnter)
{
container = eventData.pointerEnter.GetComponentInParent <IDragDestination <T> >();
}
}
//if we have a container object then drop our item into the new container.
if (container != null)
{
DropItemIntoContainer(container);
}
}
private void DropItemIntoContainer(IDragDestination <T> destination)
{
if (ReferenceEquals(destination, _source))
{
return;
}
if (_source is EquipmentSlotUi sourceEquipmentSlot && sourceEquipmentSlot.IsLocked())
{
return;
}
if (destination is EquipmentSlotUi destEquipmentSlot && destEquipmentSlot.IsLocked())
{
return;
}
var destinationContainer = destination as IDragContainer <T>;
var sourceContainer = _source as IDragContainer <T>;
// Swap won't be possible
if (destinationContainer == null || sourceContainer == null ||
destinationContainer.GetItem() == null ||
ReferenceEquals(destinationContainer.GetItem(), sourceContainer.GetItem()))
{
AttemptSimpleTransfer(destination);
return;
}
AttemptSwap(destinationContainer, sourceContainer);
}
private bool AttemptSimpleTransfer(IDragDestination <T> destination)
{
var draggingItem = source.GetItem();
var draggingNumber = source.GetNumber();
var acceptable = destination.MaxAcceptable(draggingItem);
var toTransfer = Mathf.Min(acceptable, draggingNumber);
if (toTransfer > 0)
{
source.RemoveItems(toTransfer);
destination.AddItems(draggingItem, toTransfer);
return(false);
}
return(true);
}
private void DropItemIntoContainer(IDragDestination <T> destination)
{
if (ReferenceEquals(destination, source))
{
return;
}
var destinationContainer = destination as IDragContainer <T>;
var sourceContainer = source as IDragContainer <T>;
// swap won't be possible
if (destinationContainer == null || sourceContainer == null || destinationContainer.GetItem() == null ||
ReferenceEquals(destinationContainer.GetItem(), sourceContainer.GetItem()))
{
AttemptSimpleTransfer(destination);
return;
}
AttemptSwap(destinationContainer, sourceContainer);
}
private bool AttemptItemTransfer(IDragDestination <T> destination)
{
T draggingItem = _itemSource.GetItem();
int draggingNumber = _itemSource.GetNumber();
int acceptable = destination.MaxAcceptable(draggingItem);
int toTransfer = Mathf.Min(acceptable, draggingNumber);
//if we have items to transfer
if (toTransfer > 0)
{
//remove items from the source
_itemSource.RemoveItems(toTransfer);
//and add them to the destination
destination.AddItems(draggingItem, toTransfer);
return(false);
}
return(true);
}
private void DropItemIntoContainer(IDragDestination <T> destination, InputButton button)
{
//check if destination is the same as source. If so, do nothing and return
if (object.ReferenceEquals(destination, m_source))
{
return;
}
var destinationContainer = destination as IDragContainer <T>; //Cast destination to drag container
var sourceContainer = m_source as IDragContainer <T>; //Cast source to drag container
//Check if swap is not possible. Must satisfy one of the following:
//Either the source or destination are not containers
//Destination is a container but does not contain and item (i.e. its empty)
//Destination and source are both containers and have the same item
if (destinationContainer == null || sourceContainer == null || destinationContainer.GetItem() == null || object.ReferenceEquals(destinationContainer.GetItem(), sourceContainer.GetItem()))
{
//Can't swap but try to move item from source to destination.
AttemptSimpleTransfer(destination, button);
return;
}
AttemptSwap(destinationContainer, sourceContainer);
}
