com.vaadin.flow.component.accordion.Accordion.OpenedChangeEvent API 23.1.17 | Vaadin

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com.vaadin.flow.component.accordion.

java.lang.Object
- java.util.EventObject
- - com.vaadin.flow.component.ComponentEvent<Accordion>
  - - com.vaadin.flow.component.accordion.Accordion.OpenedChangeEvent

All Implemented Interfaces:

Serializable

Enclosing class:

Accordion
```
@DomEvent("opened-changed")
public static class Accordion.OpenedChangeEvent
extends ComponentEvent<Accordion>
```
An event fired when an Accordion is opened or closed.

See Also:

Serialized Form

Field Summary
- Fields inherited from class java.util.EventObject
  source

Constructor Summary

Constructors
Constructor	Description
`OpenedChangeEvent(Accordion source, boolean fromClient, Integer index)`	Creates a new event using the given source and indicator whether the event originated from the client side or the server side.

Method Summary

All Methods
Modifier and Type	Method	Description
`OptionalInt`	`getOpenedIndex()`	Gets the index of the opened panel or null if the accordion is closed.
`Optional<AccordionPanel>`	`getOpenedPanel()`	Gets the opened panel.

Methods inherited from class com.vaadin.flow.component.ComponentEvent
getSource, isFromClient, unregisterListener

Methods inherited from class java.util.EventObject
toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - OpenedChangeEvent
```
public OpenedChangeEvent(Accordion source,
                         boolean fromClient,
                         @EventData("event.detail.value")
                         Integer index)
```
    Creates a new event using the given source and indicator whether the event originated from the client side or the server side.
    
    Parameters:
    
    source - the source component
    
    fromClient - true if the event originated from the client
    
    index - the index of the opened panel or null if the accordion is closed
- Method Detail
  - getOpenedIndex
```
public OptionalInt getOpenedIndex()
```
    Gets the index of the opened panel or null if the accordion is closed.
    
    Returns:
    
    the index of the opened panel or null if closed
  - getOpenedPanel
```
public Optional<AccordionPanel> getOpenedPanel()
```
    Gets the opened panel. Caution should be exercised when using this method with an Accordion which along with its panels were created in a template. Such template children would by default not be children of the Accordion Flow component, thus making it possible for this method to return the wrong panel in such cases.
    
    Returns:
    
    the opened panel.