/// <summary>
/// Swap items between two cells
/// </summary>
/// <param name="firstCell"> Cell </param>
/// <param name="secondCell"> Cell </param>
public void SwapItems(DragAndDropCell firstCell, DragAndDropCell secondCell)
{
if ((firstCell != null) && (secondCell != null))
{
DragAndDropItem firstItem = firstCell.GetItem(); // Get item from first cell
DragAndDropItem secondItem = secondCell.GetItem(); // Get item from second cell
// Swap items
if (firstItem != null)
{
firstItem.transform.SetParent(secondCell.transform, false);
firstItem.transform.localPosition = Vector3.zero;
firstItem.MakeRaycast(true);
}
if (secondItem != null)
{
secondItem.transform.SetParent(firstCell.transform, false);
secondItem.transform.localPosition = Vector3.zero;
secondItem.MakeRaycast(true);
}
// Update states
firstCell.UpdateMyItem();
secondCell.UpdateMyItem();
firstCell.UpdateBackgroundState();
secondCell.UpdateBackgroundState();
}
}
/// <summary>
/// This item started to drag.
/// </summary>
/// <param name="eventData"></param>
public void OnBeginDrag(PointerEventData eventData)
{
if (dragDisabled == false)
{
sourceCell = GetCell(); // Remember source cell
draggedItem = this; // Set as dragged item
// Create item's icon
icon = new GameObject();
icon.transform.SetParent(canvas.transform);
icon.name = "Icon";
Image myImage = GetComponent <Image>();
myImage.raycastTarget = false; // Disable icon's raycast for correct drop handling
Image iconImage = icon.AddComponent <Image>();
iconImage.raycastTarget = false;
iconImage.sprite = myImage.sprite;
RectTransform iconRect = icon.GetComponent <RectTransform>();
// Set icon's dimensions
RectTransform myRect = GetComponent <RectTransform>();
iconRect.pivot = new Vector2(0.5f, 0.5f);
iconRect.anchorMin = new Vector2(0.5f, 0.5f);
iconRect.anchorMax = new Vector2(0.5f, 0.5f);
iconRect.sizeDelta = new Vector2(myRect.rect.width, myRect.rect.height);
if (OnItemDragStartEvent != null)
{
OnItemDragStartEvent(this); // Notify all items about drag start for raycast disabling
}
}
}
/// <summary>
/// Resets all temporary conditions.
/// </summary>
private void ResetConditions()
{
if (icon != null)
{
Destroy(icon); // Destroy icon on item drop
}
if (OnItemDragEndEvent != null)
{
OnItemDragEndEvent(this); // Notify all cells about item drag end
}
draggedItem = null;
icon = null;
sourceCell = null;
}
/// <summary>
/// Put item into this cell.
/// </summary>
/// <param name="item">Item.</param>
private void PlaceItem(DragAndDropItem item)
{
if (item != null)
{
DestroyItem(); // Remove current item from this cell
myDadItem = null;
DragAndDropCell cell = item.GetComponentInParent <DragAndDropCell>();
if (cell != null)
{
if (cell.unlimitedSource == true)
{
string itemName = item.name;
item = Instantiate(item); // Clone item from source cell
item.name = itemName;
}
}
item.transform.SetParent(transform, false);
item.transform.localPosition = Vector3.zero;
item.MakeRaycast(true);
myDadItem = item;
}
UpdateBackgroundState();
}
/// <summary>
/// Item is dropped in this cell
/// </summary>
/// <param name="data"></param>
public void OnDrop(PointerEventData data)
{
if (DragAndDropItem.icon == null)
{
return;
}
DragAndDropItem item = DragAndDropItem.draggedItem;
DragAndDropCell sourceCell = DragAndDropItem.sourceCell;
if (DragAndDropItem.icon.activeSelf == true) // If icon inactive do not need to drop item into cell
{
if ((item != null) && (sourceCell != this))
{
if (!section.Equals(item.section))
{
return;
}
if ((!slot.Equals(item.slot)) && (!slot.Equals(DragAndDrop.Slot.Everything)))
{
return;
}
DropEventDescriptor desc = new DropEventDescriptor();
switch (cellType) // Check this cell's type
{
case CellType.Swap: // Item in destination cell can be swapped
UpdateMyItem();
switch (sourceCell.cellType)
{
case CellType.Swap: // Item in source cell can be swapped
// Fill event descriptor
desc.item = item;
desc.sourceCell = sourceCell;
desc.destinationCell = this;
SendRequest(desc); // Send drop request
StartCoroutine(NotifyOnDragEnd(desc)); // Send notification after drop will be finished
if (desc.permission == true) // If drop permitted by application
{
if (myDadItem != null) // If destination cell has item
{
// Fill event descriptor
DropEventDescriptor descAutoswap = new DropEventDescriptor();
descAutoswap.item = myDadItem;
descAutoswap.sourceCell = this;
descAutoswap.destinationCell = sourceCell;
SendRequest(descAutoswap); // Send drop request
StartCoroutine(NotifyOnDragEnd(descAutoswap)); // Send notification after drop will be finished
if (descAutoswap.permission == true) // If drop permitted by application
{
SwapItems(sourceCell, this); // Swap items between cells
}
else
{
PlaceItem(item); // Delete old item and place dropped item into this cell
}
}
else
{
PlaceItem(item); // Place dropped item into this empty cell
}
}
break;
default: // Item in source cell can not be swapped
// Fill event descriptor
desc.item = item;
desc.sourceCell = sourceCell;
desc.destinationCell = this;
SendRequest(desc); // Send drop request
StartCoroutine(NotifyOnDragEnd(desc)); // Send notification after drop will be finished
if (desc.permission == true) // If drop permitted by application
{
PlaceItem(item); // Place dropped item into this cell
}
break;
}
break;
case CellType.DropOnly: // Item only can be dropped into destination cell
// Fill event descriptor
desc.item = item;
desc.sourceCell = sourceCell;
desc.destinationCell = this;
SendRequest(desc); // Send drop request
StartCoroutine(NotifyOnDragEnd(desc)); // Send notification after drop will be finished
if (desc.permission == true) // If drop permitted by application
{
PlaceItem(item); // Place dropped item in this cell
}
break;
default:
break;
}
}
}
if (item != null)
{
if (item.GetComponentInParent <DragAndDropCell>() == null) // If item have no cell after drop
{
Destroy(item.gameObject); // Destroy it
}
}
UpdateMyItem();
UpdateBackgroundState();
sourceCell.UpdateMyItem();
sourceCell.UpdateBackgroundState();
}