/// <summary>
/// Binding a specified view model property to a provided action.
/// </summary>
/// <typeparam name="TView"></typeparam>
/// <typeparam name="TViewModel"></typeparam>
/// <typeparam name="TViewModelProperty1"></typeparam>
/// <typeparam name="TOut"></typeparam>
/// <param name="view"></param>
/// <param name="viewModelProperty"></param>
/// <param name="action"></param>
/// <param name="formatter"></param>
/// <param name="strict"></param>
/// <returns></returns>
public static IValidationBinding ForProperty <TView, TViewModel, TViewModelProperty1, TOut>(TView view,
Expression <Func <TViewModel, TViewModelProperty1> > viewModelProperty,
Action <ValidationState, TOut> action,
IValidationTextFormatter <TOut> formatter = null,
bool strict = true)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, ISupportsValidation
{
if (formatter == null)
{
throw new ArgumentNullException(nameof(formatter));
}
var vcObs = view.WhenAnyValue(v => v.ViewModel).
Where(vm => vm != null).
Select(
viewModel =>
viewModel.ValidationContext.ResolveFor(viewModelProperty, strict)
.ValidationStatusChange).
Switch().
Select(vc => new { ValidationChange = vc, Formatted = formatter.Format(vc.Text) }).
Do(r => action(r.ValidationChange, r.Formatted)).
Select(_ => Unit.Default);
return(new ValidationBinding(vcObs));
}
/// <summary>
/// Create a binding between a view model property and a view property.
/// </summary>
/// <remarks>Supports multiple validations for the same property.</remarks>
/// <typeparam name="TView">ViewFor of ViewModel type.</typeparam>
/// <typeparam name="TViewModel">ViewModel type.</typeparam>
/// <typeparam name="TViewModelProperty">ViewModel property type.</typeparam>
/// <typeparam name="TViewProperty">View property type.</typeparam>
/// <param name="view">View instance.</param>
/// <param name="viewModelProperty">ViewModel property.</param>
/// <param name="viewProperty">View property.</param>
/// <param name="formatter">Validation formatter.</param>
/// <param name="strict">Indicates if the ViewModel property to find is unique.</param>
/// <returns>Returns a validation component.</returns>
public static IValidationBinding ForProperty <TView, TViewModel, TViewModelProperty, TViewProperty>(
TView view,
Expression <Func <TViewModel, TViewModelProperty> > viewModelProperty,
Expression <Func <TView, TViewProperty> > viewProperty,
IValidationTextFormatter <string> formatter = null,
bool strict = true)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, ISupportsValidation
{
if (formatter == null)
{
formatter = SingleLineFormatter.Default;
}
var vcObs = view.WhenAnyValue(v => v.ViewModel)
.Where(vm => vm != null)
.Select(
viewModel => viewModel.ValidationContext
.ResolveForMultiple(viewModelProperty, strict)
.Select(x => x.ValidationStatusChange)
.CombineLatest())
.Switch()
.Select(states => states.Select(state => formatter.Format(state.Text)).ToList());
var updateObs = BindToView(vcObs, view, viewProperty)
.Select(_ => Unit.Default);
return(new ValidationBindingEx(updateObs));
}
/// <summary>
/// Bind a <see cref="ValidationHelper"/> to a specified action.
/// </summary>
/// <typeparam name="TView"></typeparam>
/// <typeparam name="TViewModel"></typeparam>
/// <typeparam name="TOut"></typeparam>
/// <param name="view"></param>
/// <param name="viewModelHelperProperty"></param>
/// <param name="action"></param>
/// <param name="formatter"></param>
/// <returns></returns>
public static IValidationBinding ForValidationHelperProperty <TView, TViewModel, TOut>(TView view,
Expression <Func <TViewModel, ValidationHelper> > viewModelHelperProperty,
Action <ValidationState, TOut> action,
IValidationTextFormatter <TOut> formatter = null
)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, ISupportsValidation
{
if (formatter == null)
{
throw new ArgumentNullException(nameof(formatter));
}
var vcObs = view.WhenAnyValue(v => v.ViewModel).
Where(vm => vm != null).
Select(
viewModel =>
viewModel.WhenAnyValue(viewModelHelperProperty).SelectMany(vy => vy.ValidationChanged)).
Switch().
Select(vc => new { ValidationChange = vc, Formatted = formatter.Format(vc.Text) });
var updateObs = vcObs.Do(r =>
{
action(r.ValidationChange, r.Formatted);
}).
Select(_ => Unit.Default);
return(new ValidationBinding(updateObs));
}
/// <summary>
/// Create a binding between a <see cref="ValidationHelper"/> and a specified view property.
/// </summary>
/// <typeparam name="TView"></typeparam>
/// <typeparam name="TViewModel"></typeparam>
/// <typeparam name="TViewProperty"></typeparam>
/// <param name="view"></param>
/// <param name="viewModelHelperProperty"></param>
/// <param name="viewProperty"></param>
/// <param name="formatter"></param>
/// <returns></returns>
public static IValidationBinding ForValidationHelperProperty <TView, TViewModel, TViewProperty>(TView view,
Expression <Func <TViewModel, ValidationHelper> > viewModelHelperProperty,
Expression <Func <TView, TViewProperty> > viewProperty,
IValidationTextFormatter <string> formatter = null)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, ISupportsValidation
{
if (formatter == null)
{
formatter = SingleLineFormatter.Default;
}
var vcObs = view.WhenAnyValue(v => v.ViewModel).
Where(vm => vm != null).
Select(
viewModel =>
viewModel.WhenAnyValue(viewModelHelperProperty).SelectMany(vy => vy.ValidationChanged)).
Switch().
Select(vc => formatter.Format(vc.Text));
var updateObs = BindToView(vcObs, view, viewProperty).
Select(_ => Unit.Default);
return(new ValidationBinding(updateObs));
}
/// <summary>
/// Creates a binding between a ViewModel and a View property.
/// </summary>
/// <typeparam name="TView">ViewFor of ViewModel type.</typeparam>
/// <typeparam name="TViewModel">ViewModel type.</typeparam>
/// <typeparam name="TViewProperty">View property type.</typeparam>
/// <param name="view">View instance.</param>
/// <param name="viewProperty">View property to bind the validation message.</param>
/// <param name="formatter">Validation formatter.</param>
/// <returns>Returns a validation component.</returns>
public static IValidationBinding ForViewModel <TView, TViewModel, TViewProperty>(
TView view,
Expression <Func <TView, TViewProperty> > viewProperty,
IValidationTextFormatter <string>?formatter = null)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, IValidatableViewModel
{
if (view is null)
{
throw new ArgumentNullException(nameof(view));
}
if (viewProperty is null)
{
throw new ArgumentNullException(nameof(view));
}
formatter ??= SingleLineFormatter.Default;
var vcObs = view
.WhenAnyValue(v => v.ViewModel)
.Where(vm => vm != null)
.SelectMany(vm => vm !.ValidationContext.ValidationStatusChange)
.Select(vc => formatter.Format(vc.Text));
var updateObs = BindToView(vcObs, view, viewProperty)
.Select(_ => Unit.Default);
return(new ValidationBinding(updateObs));
}
/// <summary>
/// Creates a binding from a specified ViewModel property to a provided action.
/// </summary>
/// <typeparam name="TView">ViewFor of ViewModel type.</typeparam>
/// <typeparam name="TViewModel">ViewModel type.</typeparam>
/// <typeparam name="TViewModelProperty">ViewModel property type.</typeparam>
/// <typeparam name="TOut">Action return type.</typeparam>
/// <param name="view">View instance.</param>
/// <param name="viewModelProperty">ViewModel property.</param>
/// <param name="action">Action to be executed.</param>
/// <param name="formatter">Validation formatter.</param>
/// <param name="strict">Indicates if the ViewModel property to find is unique.</param>
/// <returns>Returns a validation component.</returns>
public static IValidationBinding ForProperty <TView, TViewModel, TViewModelProperty, TOut>(
TView view,
Expression <Func <TViewModel, TViewModelProperty> > viewModelProperty,
Action <IList <ValidationState>, IList <TOut> > action,
IValidationTextFormatter <TOut> formatter,
bool strict = true)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, IValidatableViewModel
{
if (view is null)
{
throw new ArgumentNullException(nameof(view));
}
if (viewModelProperty is null)
{
throw new ArgumentNullException(nameof(viewModelProperty));
}
if (action is null)
{
throw new ArgumentNullException(nameof(action));
}
if (formatter == null)
{
throw new ArgumentNullException(nameof(formatter));
}
var vcObs = view
.WhenAnyValue(v => v.ViewModel)
.Where(vm => vm != null)
.Select(
viewModel => viewModel !
.ValidationContext
.ResolveFor(viewModelProperty, strict)
.Select(x => x.ValidationStatusChange)
.CombineLatest())
.Switch()
.Select(states => new
{
ValidationChange = states,
Formatted = states
.Select(state => formatter.Format(state.Text))
.ToList()
})
.Do(r => action(r.ValidationChange, r.Formatted))
.Select(_ => Unit.Default);
return(new ValidationBinding(vcObs));
}
/// <summary>
/// Creates a binding between a ViewModel property and a view property.
/// </summary>
/// <typeparam name="TView">ViewFor of ViewModel type.</typeparam>
/// <typeparam name="TViewModel">ViewModel type.</typeparam>
/// <typeparam name="TViewModelProperty">ViewModel property type.</typeparam>
/// <typeparam name="TViewProperty">View property type.</typeparam>
/// <param name="view">View instance.</param>
/// <param name="viewModelProperty">ViewModel property.</param>
/// <param name="viewProperty">View property.</param>
/// <param name="formatter">Validation formatter. Defaults to the <see cref="SingleLineFormatter"/>.</param>
/// <param name="strict">Indicates if the ViewModel property to find is unique.</param>
/// <returns>Returns a validation component.</returns>
public static IValidationBinding ForProperty <TView, TViewModel, TViewModelProperty, TViewProperty>(
TView view,
Expression <Func <TViewModel, TViewModelProperty> > viewModelProperty,
Expression <Func <TView, TViewProperty> > viewProperty,
IValidationTextFormatter <string>?formatter = null,
bool strict = true)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, IValidatableViewModel
{
if (view is null)
{
throw new ArgumentNullException(nameof(view));
}
if (viewModelProperty is null)
{
throw new ArgumentNullException(nameof(viewModelProperty));
}
if (viewProperty is null)
{
throw new ArgumentNullException(nameof(viewProperty));
}
formatter ??= SingleLineFormatter.Default;
var vcObs = view
.WhenAnyValue(v => v.ViewModel)
.Where(vm => vm != null)
.Select(
viewModel => viewModel !
.ValidationContext
.ResolveFor(viewModelProperty, strict)
.Select(x => x.ValidationStatusChange)
.CombineLatest())
.Switch()
.Select(
states => states
.Select(state => formatter.Format(state.Text))
.FirstOrDefault(msg => !string.IsNullOrEmpty(msg)) ?? string.Empty);
var updateObs = BindToView(vcObs, view, viewProperty)
.Select(_ => Unit.Default);
return(new ValidationBinding(updateObs));
}