public void Update(SortArgument sort_argument)
{
// Find comparer
var comparer = comparers.Find(c => c.Property == sort_argument.Property);
if (sort_argument.Direction.HasValue) // Sort direction is NOT null, so this is either a new sort property or an old property that must change direction
{
if (comparer != null) // This is an old property that must change direction
{
comparer.Direction = sort_argument.Direction.Value;
view.Refresh();
}
else // This is a new sort property that must be added
{
Add(factory.Create(sort_argument));
}
}
else // Sort direction is null, so old comparers/sorters must be removed
{
if (comparer != null)
{
Remove(comparer);
}
}
}
private static void UpdateHeader(GridViewColumnHeader header, ListSortDirection?direction)
{
// Set the sort direction on the header
SetSortDirection(header, direction);
// Find the property to report to the command
string property = GetSortProperty(header.Column);
if (property == null)
{
if (header.Content is string)
{
property = header.Content as string;
}
else
{
throw new InvalidOperationException("No sort property or string header defined on column");
}
}
SortArgument sort_argument = new SortArgument(property, direction);
// Execute the command
ICommand command = GetSortCommand(header.Column) as ICommand;
if (command != null && command.CanExecute(sort_argument))
{
command.Execute(sort_argument);
}
}