/// <inheritdoc />
public override void MoveEnd(GridLayout gridLayout, GameObject brushTarget, BoundsInt position)
{
if (brushTarget.layer == 31)
{
base.MoveEnd(gridLayout, brushTarget, position);
return;
}
if (IsInvalid(brushTarget, out var mapPart))
{
return;
}
// when moving items, we may overlap the start region, in which case, we can't blindly erase the
// objects at the given position. Therefore, keep track of all of the items we're moving
// and if we encounter them when needing to erase objects, don't erase them (they'll simply
// move position)
var itemsToKeep = new HashSet <GameObject>(_moveData.OfType <GameObject>().Where(it => it != null));
// destroy the given object if it's not in our keep list
void DestroyIfNeeded(GameObject it)
{
if (it != null && !itemsToKeep.Contains(it))
{
Undo.DestroyObjectImmediate(it);
}
}
// iterate through all of the new positions
foreach (var childPosition in position.allPositionsWithin)
{
// if there's something already there, delete it
var existingInstance = GetObjectInCell(gridLayout, brushTarget.transform, childPosition);
DestroyIfNeeded(existingInstance);
// and then move the old object over to the new position
var newInstance = _moveData[childPosition.x - position.xMin, childPosition.y - position.yMin];
if (newInstance != null)
{
if (mapPart.IsValidPosition(childPosition))
{
MoveInstanceToCellPosition(gridLayout, brushTarget, childPosition, newInstance);
}
else
{
Undo.DestroyObjectImmediate(newInstance);
}
}
}
// clear our existing move data so that we don't accidentally do anything with it later
_moveData = null;
}