public static IPresenter GetPresenter(this IParameterDescriptor param)
{
if (PresenterProperty.TryGet(param.Metadata, out var presenter))
{
return(presenter);
}
if (TryGetPresentTypeConverter(param, out _))
{
return(TypeConvertedPresenter.Instance);
}
if (param.IsSelectable())
{
return(SelectablePresenter.Instance);
}
if (param.IsMultiValue())
{
return(MultiValuePresenter.Instance);
}
return(GetPresenter(param.ValueType) ?? throw new NotSupportedException($"presenter not found for type '{param.ValueType}'"));
}
public PresentedParameter Present(IParameterDescriptor param, Action updateCallback)
{
string ToStrFunc(object value) => param.ConvertValueToString(value);
IEnumerable items;
if (SelectableValuesFuncProperty.TryGet(param.Metadata, out var selectableValuesFunc))
{
items = selectableValuesFunc(param);
}
else if (param.IsSelectable())
{
items = param.SelectableValues;
}
else
{
throw new ProgrammingException("Parameter.SelectableValues or SelectablePresenter.SelectableValuesFuncProperty must be assigned");
}
var comboBox = new ComboBox {
ItemsSource = ToStringOverridenWrapper.Of(items, ToStrFunc)
};
comboBox.SelectionChanged += (sender, args) => updateCallback();
void Setter(object val) => comboBox.SelectedValue = ToStringOverridenWrapper.Wrap(val, ToStrFunc);
object Getter() => ToStringOverridenWrapper.TryUnwrap(comboBox.SelectedValue);
void Updater(ParameterStateType state, bool value)
{
if (state == ParameterStateType.Enabled)
{
comboBox.IsEnabled = value;
}
}
return(new PresentedParameter(param, comboBox, new PresentedParameter.ParamDelegates(Getter, Setter, value => value != null, Updater)));
}