public static IAttribute <T> Default <T>()
{
return(Create(
Observable.Return(UxExpression.Inherited(default(T))),
Observable.Return(default(T)),
clear: Command.Disabled,
write: (t, save) => { },
isReadOnly: Observable.Return(true),
stringValue: Property.Constant("")));
}
public static IAttribute <TOut> Focus <TIn, TOut>(
this IAttribute <TIn> property,
Func <TIn, TOut> select,
Func <TIn, TOut, TIn> combine,
Func <string, Parsed <TOut> > parse,
Func <TOut, string> serialize,
TOut inheritedValue)
{
return(property.Focus(
c => c.Local
.SelectMany(l => l.Value)
.MatchWith(
some: local => UxExpression.Local(serialize(select(local)), parse, inheritedValue),
none: () => UxExpression.Inherited(inheritedValue)),
select,
combine));
}
public static IAttribute <TTo> Convert <TTo>(
this IProperty <Optional <string> > property,
Func <string, Parsed <TTo> > parse,
Func <TTo, string> serialize,
TTo defaultValue)
{
return(Attribute.Create(
expression: property.Select(v =>
v.MatchWith(
some: value => UxExpression.Local(value, parse, defaultValue),
none: () => UxExpression.Inherited(defaultValue))),
value: property.SelectSome(v =>
v.MatchWith(
some: prop => parse(prop).Value,
none: () => Optional.Some(defaultValue))),
clear: Command.Enabled(() => property.Write(Optional.None())),
write: (value, save) => property.Write(serialize(value), save),
isReadOnly: property.IsReadOnly,
stringValue: property.OrEmpty()));
}