public static IDisposable BindValidationEx <TView, TViewModel, TViewModelProperty>(
this TView view,
TViewModel?viewModel,
Expression <Func <TViewModel, TViewModelProperty?> > viewModelProperty,
TextInputLayout viewProperty,
IValidationTextFormatter <string>?formatter = null)
where TView : IViewFor <TViewModel>
where TViewModel : class, IReactiveObject, 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 ??= Locator.Current.GetService <IValidationTextFormatter <string> >() ??
SingleLineFormatter.Default;
return(ValidationBinding.ForProperty(
view,
viewModelProperty,
(_, errors) => viewProperty.Error = errors.FirstOrDefault(msg => !string.IsNullOrEmpty(msg)),
formatter));
}
public static IDisposable BindValidation <TView, TViewModel, TViewModelProperty, TViewProperty>(
this TView view,
TViewModel viewModel,
Expression <Func <TViewModel, TViewModelProperty> > viewModelProperty,
Expression <Func <TView, TViewProperty> > viewProperty,
IValidationTextFormatter <string>?formatter = null)
where TView : IViewFor <TViewModel>
where TViewModel : class, IReactiveObject, IValidatableViewModel
{
if (viewModel is null)
{
throw new ArgumentNullException(nameof(viewModel));
}
if (viewModelProperty is null)
{
throw new ArgumentNullException(nameof(viewModelProperty));
}
if (viewProperty is null)
{
throw new ArgumentNullException(nameof(viewProperty));
}
return(ValidationBinding.ForProperty(view, viewModelProperty, viewProperty, formatter));
}
/// <summary>
/// Platform binding to the <see cref="TextInputLayout"/>
/// </summary>
/// <typeparam name="TView"></typeparam>
/// <typeparam name="TViewModel"></typeparam>
/// <typeparam name="TViewModelProp"></typeparam>
/// <param name="view"></param>
/// <param name="viewModel"></param>
/// <param name="viewModelProperty"></param>
/// <param name="viewProperty"></param>
/// <returns></returns>
public static IDisposable BindValidation <TView, TViewModel, TViewModelProp>(this TView view,
TViewModel viewModel, Expression <Func <TViewModel, TViewModelProp> > viewModelProperty,
TextInputLayout viewProperty)
where TViewModel : ReactiveObject, ISupportsValidation
where TView : IViewFor <TViewModel>
{
return(ValidationBinding.ForProperty(view, viewModelProperty, (ValidationState v, string f) => viewProperty.Error = f, SingleLineFormatter.Default));
}
public static IDisposable BindValidation <TView, TViewModel, TViewModelProperty, TViewProperty>(
this TView view,
TViewModel viewModel,
Expression <Func <TViewModel, TViewModelProperty> > viewModelProperty,
Expression <Func <TView, TViewProperty> > viewProperty)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, IValidatableViewModel
{
return(ValidationBinding.ForProperty(view, viewModelProperty, viewProperty));
}
public static IDisposable BindValidation<TView, TViewModel, TViewModelProperty>(
this TView view,
TViewModel viewModel,
Expression<Func<TViewModel, TViewModelProperty>> viewModelProperty,
TextInputLayout viewProperty)
where TView : IViewFor<TViewModel>
where TViewModel : ReactiveObject, IValidatableViewModel
{
return ValidationBinding.ForProperty(
view,
viewModelProperty,
(_, errorText) => viewProperty.Error = errorText,
SingleLineFormatter.Default);
}
public static IDisposable BindValidationEx <TView, TViewModel, TViewModelProperty>(
this TView view,
TViewModel viewModel,
Expression <Func <TViewModel, TViewModelProperty> > viewModelProperty,
TextInputLayout viewProperty)
where TView : IViewFor <TViewModel>
where TViewModel : ReactiveObject, IValidatableViewModel
{
return(ValidationBinding.ForProperty(
view,
viewModelProperty,
(_, errors) => viewProperty.Error = errors.FirstOrDefault(msg => !string.IsNullOrEmpty(msg)),
SingleLineFormatter.Default));
}
public void ShouldSupportActionBindingRequiredForPlatformSpecificImplementations()
{
const string nameErrorMessage = "Name should not be empty.";
var view = new TestView(new TestViewModel {
Name = string.Empty
});
view.ViewModel.ValidationRule(
vm => vm.Name,
s => !string.IsNullOrEmpty(s),
nameErrorMessage);
ValidationBinding.ForProperty <TestView, TestViewModel, string, string>(
view,
viewModel => viewModel.Name,
(_, errorText) => view.NameErrorLabel = errorText.FirstOrDefault(msg => !string.IsNullOrEmpty(msg)),
SingleLineFormatter.Default);
Assert.False(view.ViewModel.ValidationContext.IsValid);
Assert.Equal(1, view.ViewModel.ValidationContext.Validations.Count);
Assert.NotEmpty(view.NameErrorLabel);
Assert.Equal(nameErrorMessage, view.NameErrorLabel);
}
