public void Observes <U>(IReadOnlyValue <U> other)
{
// REVIEW: recursive?
void Handler(bool isUserAction)
{
var res = _computation();
Logger.Debug(GetType(), "DerivedValue computation[1] result={0}", res);
var old = Value;
Errors = !res.Success ? new[] { res.ErrorMessage } : new string[] { };
Value = res.Success ? res.Result : _errorValue;
Logger.Debug(GetType(), "DerivedValue computation[1] oldValue={0} newValue={1} errors={2}", old, Value, Errors.PrettyToString());
Changed?.Invoke(this, old, Value, Errors, isUserAction);
}
other.Changed += (sender, value, newValue, errors, change) => Handler(change);
Handler(false); //trigger validation / initialization
Logger.Debug(GetType(), "DerivedValue subscribed to value");
}
public static MenuItemUserModel CreateRemoteLeaf(
IReadOnlyValue <string> label, Func <Task <Unit> > command, bool isExitItem = false,
string descriptionOrNull = null)
{
return(new MenuItemUserModel(
label, new RemoteActionModel <Unit>(false, command), null, isExitItem, descriptionOrNull));
}
public void Observes <U>(IReadOnlyValue <U> other)
{
_dependencies.Add(() => other.Errors);
void Handler(bool isUserAction)
{
var old = Value;
var valueAndErrors = _computeValueAndErrors();
Value = valueAndErrors.Item1;
Errors = valueAndErrors.Item2;
var errCopy = Errors.ToList();
Logger.Debug(GetType(), "ComputedValueOnDependancyChanged oldValue={0} newValue={1} errors={2}", old, Value, errCopy.PrettyToString());
Changed?.Invoke(this, old, Value, errCopy, isUserAction);
}
// REVIEW: this looks like recursive call, because handler calls event inside it's body... or am I not getting somethiung ...
other.Changed += (sender, value, newValue, errors, change) => Handler(change);
Handler(false); //trigger validation / initialization
Logger.Debug(GetType(), "ComputedValueOnDependancyChanged subscribed to {0} values", _dependencies.Count);
}
private MenuItemModel(
int menuItemId, IReadOnlyValue <string> label, IEnumerable <MenuItemModel> subItemsOrNull,
string descriptionOrNull, MenuItemUserModel source)
{
Id = menuItemId;
DescriptonOrNull = descriptionOrNull;
Label = label;
Items = subItemsOrNull;
Source = source;
}
private MenuItemUserModel(
IReadOnlyValue <string> label, IActionModel <Unit> actionOrNull,
IEnumerable <MenuItemUserModel> subItemsOrNull, bool isExitItem, string descriptionOrNull)
{
Action = actionOrNull;
DescriptionOrNull = descriptionOrNull;
Label = label;
Items = subItemsOrNull;
IsExit = isExitItem;
}
public static ValueChangedRich <DomainT> BindReadOnlyAndInitialize <WidgetT, ViewT, DomainT>(
this IReadOnlyValueView <WidgetT, ViewT> view,
IReadOnlyValue <DomainT> domain,
Func <DomainT, ViewT> convertFromDomain)
{
var handler = view.BindRead(domain, convertFromDomain);
handler(domain, domain.Value, domain.Value, domain.Errors, false);
return(handler);
}
public void Observes <U>(IReadOnlyValue <U> other)
{
_dependencies.Add(() => other.Errors);
void Handler(object sender, U oldValue, U newValue, IEnumerable <string> _, bool isUserAction)
{
var old = Value;
var errors = DependencyErrors();
Value = _computation(this);
Logger.Debug(GetType(), "AggregatedErrorsValue oldValue={0} newValue={1} errors={2}", old, Value, errors.PrettyToString());
Changed?.Invoke(this, old, Value, errors, isUserAction);
}
other.Changed += Handler;
Handler(this, other.Value, other.Value, other.Errors, false); //trigger validation / initialization
Logger.Debug(GetType(), "AggregatedErrorsValue subscribed to {0} values", _dependencies.Count);
}
public static MenuItemModel CreateSubTree(
IReadOnlyValue <string> label, MenuItemUserModel source,
IEnumerable <MenuItemModel> subItems)
{
return(new MenuItemModel(-1, label, subItems, null, source));
}
public static MenuItemModel CreateLeaf(
int menuItemId, IReadOnlyValue <string> label, MenuItemUserModel source,
string descriptionOrNull = null)
{
return(new MenuItemModel(menuItemId, label, null, descriptionOrNull, source));
}
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);
}
public static ValueChangedRich <T> BindReadOnlyAndInitialize <WidgetT, T>(this IReadOnlyValueView <WidgetT, T> view, IReadOnlyValue <T> domain)
{
return(view.BindReadOnlyAndInitialize(domain, x => x));
}
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);
}
public static MenuItemUserModel CreateSubTree(
IReadOnlyValue <string> label, params MenuItemUserModel[] subItems)
{
return(new MenuItemUserModel(label, null, subItems, false, null));
}
public static MenuItemUserModel CreateSubTree(
IReadOnlyValue <string> label, IEnumerable <MenuItemUserModel> subItems)
{
return(new MenuItemUserModel(label, null, subItems, false, null));
}
public static MenuItemUserModel CreateLocalLeaf(
IReadOnlyValue <string> label, Action command, string descriptionOrNull = null)
{
return(new MenuItemUserModel(label, new LocalActionModel(command), null, false, descriptionOrNull));
}
public static MenuItemUserModel CreateLogoutLeaf(
IReadOnlyValue <string> label, string descriptionOrNull = null)
{
return(new MenuItemUserModel(
label, new LocalActionModel(LambdaUtil.DoNothingAction), null, true, descriptionOrNull));
}
