/// <summary>
/// Creates a display from this row tree. The display is an ordered list of rows, in which each row is a form-item list of values and a section for each
/// child row-tree display.
/// </summary>
/// <param name="rowTree">The merge row tree.</param>
/// <param name="fieldNameTree">The fields that you want to include in the display. Pass null for all.</param>
/// <param name="omitListIfSingleRow">Pass true to omit the root ordered-list component if the tree has exactly one row.</param>
/// <param name="useSubtractiveMode">Pass true if you want the field-name tree to represent excluded fields, rather than included fields.</param>
public static FlowComponent ToRowTreeDisplay(
this MergeRowTree rowTree, MergeFieldNameTree fieldNameTree, bool omitListIfSingleRow = false, bool useSubtractiveMode = false) =>
new GenericFlowContainer(
omitListIfSingleRow && rowTree.Rows.Count() == 1
? getRow(rowTree.Rows.Single(), fieldNameTree, useSubtractiveMode)
: new StackList(from i in rowTree.Rows select getRow(i, fieldNameTree, useSubtractiveMode).ToComponentListItem()).ToCollection(),
classes: rowTreeClass);
private static IReadOnlyCollection <FlowComponent> getRow(MergeRow row, MergeFieldNameTree fieldNameTree, bool useSubtractiveMode)
{
var valueFormItems = (useSubtractiveMode
? row.Values.Where(mergeValue => fieldNameTree?.FieldNames.All(i => i != mergeValue.Name) ?? false)
: fieldNameTree?.FieldNames.Select(fieldName => row.Values.Single(i => i.Name == fieldName)) ?? row.Values).Select(
mergeValue => {
IReadOnlyCollection <PhrasingComponent> value = null;
if (mergeValue is MergeValue <string> stringValue)
{
value = stringValue.Evaluate(false).ToComponents();
}
// Use ApplicationException instead of MailMergingException because the field names can easily be validated before this method is called.
return(value == null
? throw new ApplicationException("Merge field {0} evaluates to an unsupported type.".FormatWith(mergeValue.Name))
: value.ToFormItem(label: mergeValue.Name.ToComponents()));
})
.Materialize();
var valueList = valueFormItems.Any()
? FormItemList.CreateGrid(2, items: valueFormItems).ToCollection()
: Enumerable.Empty <FlowComponent>().Materialize();
var children = (useSubtractiveMode
? row.Children.Select(
childRowTree => {
MergeFieldNameTree childFieldNameTree = null;
if (fieldNameTree != null)
{
var childNameAndFieldNameTree = fieldNameTree.ChildNamesAndChildren.SingleOrDefault(i => i.Item1 == childRowTree.NodeName);
childFieldNameTree = childNameAndFieldNameTree != null
? childNameAndFieldNameTree.Item2
: new MergeFieldNameTree(Enumerable.Empty <string>());
}
return(new { rowTree = childRowTree, fieldNameTree = childFieldNameTree });
})
.Where(i => i.fieldNameTree != null)
: fieldNameTree?.ChildNamesAndChildren.Select(
childNameAndFieldNameTree => new
{
rowTree = row.Children.Single(i => i.NodeName == childNameAndFieldNameTree.Item1),
fieldNameTree = childNameAndFieldNameTree.Item2
}) ?? row.Children.Select(childRowTree => new { rowTree = childRowTree, fieldNameTree = (MergeFieldNameTree)null }))
.Where(child => child.rowTree.Rows.Any())
.Select(
child => new Section(
child.rowTree.NodeName,
new StackList(child.rowTree.Rows.Select(i => getRow(i, child.fieldNameTree, useSubtractiveMode).ToComponentListItem())).ToCollection()))
.Materialize();
return(children.Any() ? valueList.Append(new GenericFlowContainer(children, classes: rowTreeChildClass)).Materialize() : valueList);
}