private void AddOperand_Click(object sender, RoutedEventArgs e)
{
//
// Determine parent expression
//
ExprNode parentExpr;
parentExpr = (ExprNode)expressionModel.ExprTreeView.SelectedItem;
if (parentExpr == null && ExpressionModel.Count != 0)
{
return; // Nothing is selected
}
//
// Determine dimension (function) and create child expression
//
DimPath path = (DimPath)operands.SelectedItem;
if (path == null)
{
return;
}
var expr = ExprNode.CreateReader(path, false);
expr = (ExprNode)expr.Root;
//
// Insert new child expression
//
if (parentExpr == null) // First exprssion node
{
ExpressionModel.Add(expr);
}
else
{
parentExpr.AddChild(expr);
}
RefreshAll();
}
public ArithmeticBox(DcColumn column, bool whereExpression)
{
this.okCommand = new DelegateCommand(this.OkCommand_Executed, this.OkCommand_CanExecute);
IsWhere = whereExpression;
if (column.Input.Columns.Contains(column))
{
IsNew = false;
}
else
{
IsNew = true;
}
Column = column;
DcTable sourceTable = column.Input;
DcSchema schema = sourceTable.Schema;
SourceTable = sourceTable;
ExpressionModel = new ObservableCollection <ExprNode>(); // This contains what we will create/edit
if (IsWhere)
{
if (SourceTable.Definition.WhereExpr != null)
{
ExpressionModel.Add(SourceTable.Definition.WhereExpr);
}
}
else
{
if (Column.Definition.FormulaExpr != null)
{
ExpressionModel.Add(Column.Definition.FormulaExpr);
}
}
InitializeComponent();
newColumnName.Text = Column.Name;
// Initialize a list of possible operations
ActionType[] ops;
if (whereExpression)
{
// Other ways: to collapse a grid row: http://stackoverflow.com/questions/2502178/wpf-hide-grid-row
Controls.RowDefinitions[0].Height = new GridLength(0);
sourceTableName.IsReadOnly = false;
ops = new ActionType[]
{
ActionType.MUL, ActionType.DIV, ActionType.ADD, ActionType.SUB,
ActionType.LEQ, ActionType.GEQ, ActionType.GRE, ActionType.LES,
ActionType.EQ, ActionType.NEQ,
ActionType.AND, ActionType.OR,
};
}
else
{
Controls.RowDefinitions[0].Height = new GridLength(1, GridUnitType.Auto);
sourceTableName.IsReadOnly = true;
ops = new ActionType[] { ActionType.MUL, ActionType.DIV, ActionType.ADD, ActionType.SUB };
}
operations.ItemsSource = ops;
// Initialize a list of possible column accesses
var paths = new PathEnumerator(
new List <DcTable>(new DcTable[] { SourceTable }),
new List <DcTable>(new DcTable[] { schema.GetPrimitive("Integer"), schema.GetPrimitive("Double") }),
false,
DimensionType.IDENTITY_ENTITY
);
SourcePaths = paths.ToList();
// If we edit an existing column then we do not want to use it in the definition as an operand
DimPath columnPath = SourcePaths.FirstOrDefault(p => p.FirstSegment == column);
if (columnPath != null)
{
SourcePaths.Remove(columnPath);
}
RefreshAll();
}