//--------------------------------------------------------------------------------------------------
#endregion
#region Operands
public bool AddOperand(IShapeOperand operandShape)
{
Operands.Add(operandShape);
operandShape.AddDependent(this);
RaisePropertyChanged("ChildCount");
Invalidate();
return(true);
}
//--------------------------------------------------------------------------------------------------
public virtual bool ReplaceOperand(int operandIndex, IShapeOperand operandShape)
{
Debug.Assert(operandIndex < Operands.Count);
Debug.Assert(operandShape != null);
if (!CanReplaceOperand(operandIndex))
{
return(false);
}
var oldOp = Operands[operandIndex];
oldOp?.RemoveDependent(this);
Operands[operandIndex] = operandShape;
operandShape.AddDependent(this);
RaisePropertyChanged("ChildCount");
Invalidate();
return(true);
}