public static IEnumerable <SelectionCommandViewModelBase> CreateColumnCommands(this IHasColumns page)
{
yield return(new DefaultColumnsCommandViewModel(page));
yield return(new AllColumnsCommandViewModel(page));
if (page is IHasColumnModes m)
{
foreach (var c in m.ModeCommands)
{
yield return(c);
}
}
yield return(null);
foreach (var kv in page.GetFlags())
{
var v = ((IConvertible)kv.Key).ToInt64(null);
yield return(new FlagColumnCommandViewModel(
page,
v,
kv.Value,
isSelected: (page.Columns & v) == v));
}
}
public DefaultColumnsCommandViewModel(IHasColumns page)
: this(page, page.GetFlags().Aggregate(0L, (s, kv) => s | ((IConvertible)kv.Key).ToInt64(null)))
{
}