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 FlagColumnCommandViewModel(IHasColumns page, long value, string title, bool isSelected = false, long unselectValue = 0)
: base(title: title, isSelected: isSelected)
{
Page = page;
Value = value;
UnselectValue = unselectValue;
Invalidate();
Page.PropertyChanged += Page_PropertyChanged;
}
private AllColumnsCommandViewModel(IHasColumns page, long allFlags)
: base(page, allFlags, SR.SelectAll, isSelected: (page.Columns & allFlags) == allFlags)
{
_Extensions = page as IHasExtensionColumns;
if (_Extensions != null)
{
OnColumnsChanged();
}
}
private DefaultColumnsCommandViewModel(IHasColumns page, long allFlags)
: base(page,
page.DefaultColumns & allFlags,
SR.SelectDefault,
isSelected: (page.Columns & page.DefaultColumns & allFlags) == (page.DefaultColumns & allFlags),
unselectValue: ~page.DefaultColumns)
{
_AllFlags = allFlags;
_Extensions = page as IHasExtensionColumns;
if (_Extensions != null)
{
OnColumnsChanged();
}
}
public DefaultColumnsCommandViewModel(IHasColumns page)
: this(page, page.GetFlags().Aggregate(0L, (s, kv) => s | ((IConvertible)kv.Key).ToInt64(null)))
{
}
