/// <summary>Perform removal of the specified thing from our Children.</summary>
/// <param name="thingToRemove">The thing to remove from our Children.</param>
/// <param name="removalEvent">The removal event to work with; must have previously been sent as the request.</param>
/// <param name="multipleParentsBehavior">The multipleParentsBehavior, if applicable.</param>
/// <returns>True if the thing has been successfully removed, else false.</returns>
private bool PerformRemoval(Thing thingToRemove, RemoveChildEvent removalEvent, MultipleParentsBehavior multipleParentsBehavior)
{
if (removalEvent.IsCancelled)
{
return(false);
}
// Send the removal event.
Eventing.OnMovementEvent(removalEvent, EventScope.SelfDown);
// If the thing to remove was in our Children collection, remove it.
if (Children.Contains(thingToRemove))
{
Children.Remove(thingToRemove);
}
// If we don't have a MultipleParentsBehavior, directly remove the one-allowed
// parent ourselves, else use the behavior's logic for adjusting the parents.
if (multipleParentsBehavior == null)
{
thingToRemove.Parent = null;
}
else
{
multipleParentsBehavior.RemoveParent(this);
}
return(true);
}
private bool PerformAdd(Thing thingToAdd, AddChildEvent addEvent, MultipleParentsBehavior multipleParentsBehavior)
{
if (addEvent.IsCancelled)
{
return(false);
}
// If an existing thing is stackable with the added thing, combine the new
// thing into the existing thing instead of simply adding it.
foreach (Thing currentThing in Children)
{
if (thingToAdd.CanStack(currentThing))
{
currentThing.Combine(thingToAdd);
return(true);
}
}
// The item cannot be stacked so add the item to the specified parent.
if (!Children.Contains(thingToAdd))
{
Children.Add(thingToAdd);
}
// If we don't have a MultipleParentsBehavior, directly set the one-allowed
// parent ourselves, else use the behavior's logic for setting parents.
if (multipleParentsBehavior == null)
{
thingToAdd.Parent = this;
}
else
{
multipleParentsBehavior.AddParent(this);
}
Eventing.OnMovementEvent(addEvent, EventScope.SelfDown);
return(true);
}