public static Action BindSelectionIntoEnabled <ActionT, ItemT>(
this IActionModel <ActionT> model, DataGridModel <ItemT> datagrid, SelectionNeeded mode, RowFilter <ItemT> extraRowFilterOrNull = null)
{
void UpdateEnabled()
{
bool enabled;
switch (mode)
{
case SelectionNeeded.AtLeastOneSelected:
enabled = datagrid.Selected.Length >= 1;
break;
case SelectionNeeded.ExactlyOneSelected:
enabled = datagrid.Selected.Length == 1;
break;
default:
throw new Exception("unsupported selectionNeeded");
}
if (!enabled)
{
switch (mode)
{
case SelectionNeeded.AtLeastOneSelected:
model.ChangeEnabled(false, new[] { I18n.Translate("Need at least one row selected") }, true);
break;
case SelectionNeeded.ExactlyOneSelected:
model.ChangeEnabled(false, new[] { I18n.Translate("Need exactly one row selected") }, true);
break;
default:
throw new Exception("unsupported selectionNeeded");
}
return;
}
if (extraRowFilterOrNull == null)
{
model.ChangeEnabled(true, new string[] { }, true);
return;
}
if (datagrid.Selected.Length != datagrid.Selected.Where(extraRowFilterOrNull.Filter).Count())
{
model.ChangeEnabled(false, new[] { extraRowFilterOrNull.UserFriendlyReason }, true);
return;
}
model.ChangeEnabled(true, new string[] { }, true);
}
datagrid.Selected.Changed += (_, __, ___) => UpdateEnabled();
UpdateEnabled();
return(UpdateEnabled);
}
public static ValueChangedRich <bool> BindEnableAndInitialize <T>(this IActionModel <T> model, IReadOnlyValue <bool> validator)
{
void Handler(object sender, bool oldValue, bool newValue, IEnumerable <string> errors, bool isUserAction)
{
model.ChangeEnabled(newValue, errors, isUserAction);
Logger.Debug(typeof(ActionModelExtensions), "IActionModelExtensions->BindEnableAndInitialize set enable to {0}", newValue);
}
validator.Changed += Handler;
Handler(validator, validator.Value, validator.Value, validator.Errors, false);
return(Handler);
}