private AddChildEvent RequestAdd(Thing thingToAdd)
{
// Prepare an add event request, and ensure both the new parent (this) and the
// thing itself both get a chance to cancel this request before committing.
var addChildEvent = new AddChildEvent(thingToAdd, this);
this.Eventing.OnMovementRequest(addChildEvent, EventScope.SelfDown);
thingToAdd.Eventing.OnMovementRequest(addChildEvent, EventScope.SelfDown);
return(addChildEvent);
}
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 this.Children)
{
if (thingToAdd.CanStack(currentThing))
{
currentThing.Combine(thingToAdd);
return(true);
}
}
// The item cannot be stacked so add the item to the specified parent.
if (!this.Children.Contains(thingToAdd))
{
this.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);
}
this.Eventing.OnMovementEvent(addEvent, EventScope.SelfDown);
return(true);
}