public static ValueChangedRich <DomainT> BindRead <WidgetT, ViewT, DomainT>(this IReadOnlyValueView <WidgetT, ViewT> view, IReadOnlyValue <DomainT> domain, Func <DomainT, ViewT> convertFromDomain)
{
ValueChangedRich <DomainT> handler = (sender, oldValue, newValue, rawErrors, isUserAction) => {
var errors = rawErrors.ToList();
var allErrors = new HashSet <string>(errors);
var value = RunConvertingExceptionToFailure(convertFromDomain, newValue);
var selfInvalidation = sender == view && errors.Any();
if (!value.Success)
{
allErrors.Add(value.ErrorMessage);
}
Logger.Debug(typeof(ValueViewExtensions), "BindRead handler called with value after conversion={0} errors={1} senderIsSelf={2} selfInvalidation={3}", value, sender == view, allErrors.PrettyToString(), selfInvalidation);
if (!selfInvalidation)
{
//don't overwrite errorneus entry if entry origins from self so that user sees wrong value
view.Value = value.Result;
}
view.SetErrors(allErrors, isUserAction);
};
domain.Changed += handler;
return(handler);
}
// REVIEW: valuetuple
public static Tuple <ValueChangedRich <bool>, Action> BindAction <WidgetT, T>(this IActionView <WidgetT> view, IActionModel <T> domain)
{
ValueChangedRich <bool> domainHandler = (sender, oldValue, newValue, errors, isUserAction) => {
Logger.Debug(typeof(ActionViewExtensions), "BindAction: changing view to {0} and {1}", newValue, errors.PrettyToString());
view.Enabled = newValue;
view.DisabledReason = new HashSet <string>(errors);
};
domain.EnabledChanged += domainHandler;
Action viewHandler = async() => {
Logger.Debug(typeof(ActionViewExtensions), "BindAction: triggering enabled?={0} action {1} from view {2}", domain.Enabled, domain, view);
if (!domain.Enabled)
{
return;
}
view.State = ActionViewState.CreateOperationRunning();
view.Enabled = false;
view.DisabledReason = new HashSet <string> {
I18n.Translate("Please wait while operation is running...")
};
try {
await domain.Trigger();
view.State = ActionViewState.CreateIdleOrSuccess();
} catch (Exception ex) {
Logger.Error(typeof(ActionViewExtensions), "Bound action failed to execute {0}", ex);
view.State = ActionViewState.CreateOperationFailed(ex);
//should be handled by domain.ActionExecuted subscribers
} finally {
view.Enabled = domain.Enabled;
view.DisabledReason = new HashSet <string>(domain.DisabledReasons);
}
};
view.Triggered += viewHandler;
return(new Tuple <ValueChangedRich <bool>, Action>(domainHandler, viewHandler));
}
