ValidationStatusHandler (com.holon-platform.vaadin:holon-vaadin-root 5.2.5 API)

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface ValidationStatusHandler
```
Handler for validation status change events, typically bound to a ValueComponent source object.

Since:

5.0.0

Nested Class Summary

Nested Classes
Modifier and Type	Interface and Description
`static class`	`ValidationStatusHandler.Status` Validation status.
`static interface`	`ValidationStatusHandler.ValidationStatusEvent<V>` A validation status event.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`static ValidationStatusHandler`	`getDefault()` Create and return the default `ValidationStatusHandler`.
`static ValidationStatusHandler`	`label(com.vaadin.ui.Label statusLabel)` Create a `ValidationStatusHandler` which uses a `Label` to notify validation errors.
`static ValidationStatusHandler`	`label(com.vaadin.ui.Label statusLabel, boolean hideWhenValid)` Create a `ValidationStatusHandler` which uses a `Label` to notify validation errors.
`static ValidationStatusHandler`	`notification()` Create a `ValidationStatusHandler` which shows a `Notification` of type `Notification.TYPE_ERROR_MESSAGE` to notify validation errors.
`static ValidationStatusHandler`	`notification(boolean showAllErrors)` Create a `ValidationStatusHandler` which shows a `Notification` of type `Notification.TYPE_ERROR_MESSAGE` to notify validation errors.
`static ValidationStatusHandler`	`notification(com.vaadin.ui.Notification notification)` Create a `ValidationStatusHandler` which shows a `Notification` to notify validation errors.
`static ValidationStatusHandler`	`notification(com.vaadin.ui.Notification notification, boolean showAllErrors)` Create a `ValidationStatusHandler` which shows a `Notification` to notify validation errors.
`void`	`validationStatusChange(ValidationStatusHandler.ValidationStatusEvent<?> statusChangeEvent)` Invoked when the validation status has changed.

- Method Detail
  - validationStatusChange
```
void validationStatusChange(ValidationStatusHandler.ValidationStatusEvent<?> statusChangeEvent)
```
    Invoked when the validation status has changed.
    
    Parameters:
    
    statusChangeEvent - the changed status event, providing validation status, error message and the optional source component
  - getDefault
```
static ValidationStatusHandler getDefault()
```
    Create and return the default ValidationStatusHandler.
    The default validation status handler uses AbstractComponent.setComponentError(com.vaadin.server.ErrorMessage) to notify the validation status on the value component against whom the validation is performed, if it is available and the component returned by HasComponent.getComponent() is an AbstractComponent instance.
    
    Returns:
    
    A new default ValidationStatusHandler instance
  - label
```
static ValidationStatusHandler label(com.vaadin.ui.Label statusLabel)
```
    Create a ValidationStatusHandler which uses a Label to notify validation errors.
    By default, the status Label is set to visible only when the validation status is invalid, i.e. a validation error to display is available.
    
    Parameters:
    
    statusLabel - The Label to use to notify validation errors (not null)
    
    Returns:
    
    A new Label validation status handler instance
  - label
```
static ValidationStatusHandler label(com.vaadin.ui.Label statusLabel,
                                     boolean hideWhenValid)
```
    Create a ValidationStatusHandler which uses a Label to notify validation errors.
    
    Parameters:
    
    statusLabel - The Label to use to notify validation errors (not null)
    
    hideWhenValid - whether to hide the Label when the validation status is not invalid
    
    Returns:
    
    A new Label validation status handler instance
  - notification
```
static ValidationStatusHandler notification()
```
    Create a ValidationStatusHandler which shows a Notification of type Notification.TYPE_ERROR_MESSAGE to notify validation errors.
    This methods creates a notification validation status handler which displays only the first validation error.
    
    Returns:
    
    A new notification validation status handler instance
  - notification
```
static ValidationStatusHandler notification(boolean showAllErrors)
```
    Create a ValidationStatusHandler which shows a Notification of type Notification.TYPE_ERROR_MESSAGE to notify validation errors.
    
    Parameters:
    
    showAllErrors - true to display all validation errors, false to show only the first
    
    Returns:
    
    A new notification validation status handler instance
  - notification
```
static ValidationStatusHandler notification(com.vaadin.ui.Notification notification)
```
    Create a ValidationStatusHandler which shows a Notification to notify validation errors.
    This methods creates a notification validation status handler which displays only the first validation error.
    
    Parameters:
    
    notification - The notification instance to use, null for default
    
    Returns:
    
    A new notification validation status handler instance
  - notification
```
static ValidationStatusHandler notification(com.vaadin.ui.Notification notification,
                                            boolean showAllErrors)
```
    Create a ValidationStatusHandler which shows a Notification to notify validation errors.
    
    Parameters:
    
    notification - The notification instance to use, null for default
    
    showAllErrors - true to display all validation errors, false to show only the first
    
    Returns:
    
    A new notification validation status handler instance

Interface ValidationStatusHandler

Nested Class Summary

Method Summary

Method Detail

validationStatusChange

getDefault

label

label

notification

notification

notification

notification