private void AddElementInternal(GraphElement element)
{
if (element == null)
{
throw new ArgumentException("Cannot add null element");
}
if (containedElements.Contains(element))
{
throw new ArgumentException("The specified element is already contained in this scope.");
}
string reasonWhyNotAccepted = "Cannot add the specified element to this scope.";
if (!AcceptsElement(element, ref reasonWhyNotAccepted))
{
throw new ArgumentException(reasonWhyNotAccepted);
}
// Removes the element from its current scope
Scope currentScope = element.GetContainingScope();
if (currentScope != null)
{
currentScope.RemoveElement(element);
}
m_ContainedElements.Add(element);
element.SetContainingScope(this);
// To update the scope geometry whenever the added element's geometry changes
element.RegisterCallback <GeometryChangedEvent>(OnSubElementGeometryChanged);
ScheduleUpdateGeometryFromContent();
}
private void RemoveElementInternal(GraphElement element)
{
if (element == null)
{
throw new ArgumentException("Cannot remove null element from this scope");
}
if (!m_ContainedElements.Contains(element))
{
throw new ArgumentException("This element is not contained in this scope");
}
element.UnregisterCallback <GeometryChangedEvent>(OnSubElementGeometryChanged);
m_ContainedElements.Remove(element);
element.SetContainingScope(null);
ScheduleUpdateGeometryFromContent();
}
