public override bool DeleteChild(Expression child)
{
bool result = SecondExpression.Remove(child) || FirstExpression.Remove(child);
Expression aux = AddAuxiliary();
Caret.Instance.SetActiveExpression(aux, ExpressionSide.Left);
return(result);
}
public override void AddExpression(Expression activeExpression, Expression expressionToBeAdded)
{
int activeIndex = SecondExpression.IndexOf(activeExpression);
if (activeIndex >= 0)
{
if (Caret.Instance.ExpressionSide == ExpressionSide.Right)
{
activeIndex++;
}
SecondExpression.Insert(activeIndex, expressionToBeAdded);
// remove auxiliary
if (activeExpression is Auxiliary)
{
SecondExpression.Remove(activeExpression);
}
base.UpdateChildrensBottomMargin(SecondExpression);
return;
}
activeIndex = FirstExpression.IndexOf(activeExpression);
if (activeIndex >= 0)
{
if (Caret.Instance.ExpressionSide == ExpressionSide.Right)
{
activeIndex++;
}
FirstExpression.Insert(activeIndex, expressionToBeAdded);
// remove auxiliary
if (activeExpression is Auxiliary)
{
FirstExpression.Remove(activeExpression);
}
base.UpdateChildrensBottomMargin(FirstExpression);
return;
}
throw new KeyNotFoundException("Active expression wasn't found therefore a new expression couldn't be added.");
}
