/// ------------------------------------------------------------------------------------
/// <summary>
/// Makes the specified field the first, or primary, field on which to sort.
/// </summary>
/// ------------------------------------------------------------------------------------
public bool SetPrimarySortField(PaField field, bool changeDirection, bool ascending)
{
if (field == null)
{
return(ascending);
}
var sortInfo = SortFields.SingleOrDefault(si => si.Field.Name == field.Name);
int index = (sortInfo == null ? -1 : SortFields.IndexOf(sortInfo));
// If the sort information list already contains an item for the specified field,
// we need to remove it before reinserting it at the beginning of the list.
if (index > -1)
{
if (changeDirection)
{
ascending = SortFields[index].Ascending;
}
SortFields.RemoveAt(index);
}
if (changeDirection)
{
ascending = !ascending;
}
// Now insert an item at the beginning of the list since the specified field
// has now become the first (i.e. primary) field on which to sort.
SortFields.Insert(0, new SortField(field, ascending));
return(ascending);
}
