/// <summary>
/// Adds async scalar validator.
/// </summary>
/// <param name="input">The scalar input.</param>
/// <param name="validator">Delegate to perform validation.</param>
/// <param name="displayName">The display name used for fault error message.</param>
/// <returns>This template builder for fluent coding.</returns>
public T AddAsyncValidator <TElement>(ScalarInput <TElement> input, Func <Task <string> > validator, string displayName)
where TElement : UIElement, new()
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
return(AddAsyncValidator(input.Target, validator, displayName));
}
/// <summary>
/// Begins input implementation.
/// </summary>
/// <param name="flushingTrigger">The flushing trigger.</param>
/// <param name="progressiveFlushingTrigger">The progressive flushing trigger.</param>
/// <returns>The scalar input.</returns>
public ScalarInput <T> BeginInput(Trigger <T> flushingTrigger, Trigger <T> progressiveFlushingTrigger = null)
{
VerifyNotSealed();
if (Input != null)
{
throw new InvalidOperationException(DiagnosticMessages.TwoWayBinding_InputAlreadyExists);
}
return(Input = new ScalarInput <T>(this, flushingTrigger, progressiveFlushingTrigger));
}
void IScalarValidation.OnFlushed <T>(ScalarInput <T> scalarInput, bool makeProgress, bool valueChanged)
{
if (!makeProgress && !valueChanged)
{
return;
}
if (valueChanged)
{
UpdateAsyncErrors(scalarInput.Target);
if (Mode != ValidationMode.Explicit)
{
Validate(false);
}
}
if (UpdateProgress(scalarInput, valueChanged, makeProgress))
{
OnProgress(scalarInput);
}
InvalidateView();
}
internal bool UpdateProgress <T>(ScalarInput <T> scalarInput, bool valueChanged, bool makeProgress)
where T : UIElement, new()
{
Debug.Assert(valueChanged || makeProgress);
if (Mode != ValidationMode.Progressive || _showAll)
{
return(valueChanged);
}
var scalars = scalarInput.Target;
if (scalars == null || scalars.Count == 0)
{
return(false);
}
if (makeProgress)
{
if (_progress.IsSupersetOf(scalars))
{
return(valueChanged);
}
if (valueChanged || _valueChanged.IsSupersetOf(scalars))
{
_progress = _progress.Union(scalars);
return(true);
}
}
else
{
_valueChanged = _valueChanged.Union(scalars);
}
return(false);
}
private void OnProgress <T>(ScalarInput <T> scalarInput)
where T : UIElement, new()
{
if (Mode == ValidationMode.Explicit)
{
return;
}
if (HasError(scalarInput.Target))
{
return;
}
var asyncValidators = Template.ScalarAsyncValidators;
for (int i = 0; i < asyncValidators.Count; i++)
{
var asyncValidator = asyncValidators[i];
if (asyncValidator.SourceScalars.Intersect(scalarInput.Target).Count > 0)
{
asyncValidator.Run();
}
}
}
/// <summary>
/// Binds scalar input validation errors to <see cref="ValidationErrorsControl"/>.
/// </summary>
/// <typeparam name="T">The element type of scalar input.</typeparam>
/// <param name="source">The source scalar input.</param>
/// <returns>The scalar binding object.</returns>
public static ScalarBinding <ValidationErrorsControl> BindToValidationErrorsControl <T>(this ScalarInput <T> source)
where T : UIElement, new()
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
return(new ScalarBinding <ValidationErrorsControl>(
onRefresh: (v, p) =>
{
var errors = source.GetValidationInfo(p.FlowIndex).Errors;
if (ShouldUpdateItemsSource(v, errors))
{
v.ItemsSource = errors;
}
},
onSetup: null, onCleanup: null));
}
private static ScalarBinding <InPlaceEditor> MergeIntoInPlaceEditor <TEditing, TInert>(this ScalarInput <TEditing> scalarInput, ScalarBinding <TInert> inertScalarBinding)
where TEditing : UIElement, new()
where TInert : UIElement, new()
{
Debug.Assert(scalarInput != null);
Debug.Assert(inertScalarBinding != null);
return(InPlaceEditor.AddToInPlaceEditor(scalarInput, inertScalarBinding));
}
