private void AddOperand_Click(object sender, RoutedEventArgs e)
{
//
// Determine parent expression
//
ExprNode parentExpr;
parentExpr = (ExprNode)expressionModel.ExpressionTree.SelectedItem;
if (parentExpr == null && ExpressionModel.Count != 0)
{
return; // Nothing is selected
}
//
// Determine dimension (function) and create child expression
//
Dim op = (Dim)Operands.SelectedItem;
if (op == null)
{
return;
}
var expr = ExprNode.CreateProjectExpression(new List <Dim> {
FilteredTable.SuperDim, op
}, Operation.DOT);
//
// Insert new child expression
//
if (parentExpr == null) // First exprssion node
{
ExpressionModel.Add(expr);
}
else
{
if (parentExpr.Input == null)
{
parentExpr.Input = expr;
}
else
{
parentExpr.AddOperand(expr);
}
}
RefreshAll();
}
