Package com.storedobject.vaadin.util

Class Listeners

java.lang.Object

com.storedobject.vaadin.util.Listeners

Direct Known Subclasses:

ClickListeners, ValueChangeListeners

public abstract class Listeners
extends Object

Abstract base class for managing and notifying a collection of listeners. Subclasses should provide an implementation for the fire method to define how events are dispatched to individual listeners. This class is designed to manage multiple listeners that can be added or removed dynamically and supports the firing of events to all registered listeners.

Author:

Syam

Constructor Summary

Constructors

Constructor	Description
Listeners()

Method Summary

Modifier and Type	Method	Description
com.vaadin.flow.shared.Registration	add(EventListener listener)	Adds a listener to the internal collection of event listeners.
protected abstract void	fire(EventListener listener, EventObject event)	Dispatches an event to a specified listener.
void	fire(EventObject event)	Notifies all registered listeners of the provided event by invoking the fire method for each listener.
void	remove(EventListener listener)	Removes the specified event listener from the collection of registered listeners.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Listeners

public Listeners()

Method Details

fire

public void fire(EventObject event)

Notifies all registered listeners of the provided event by invoking the fire method for each listener.

Parameters:

event - the event to be dispatched to each registered listener

fire

protected abstract void fire(EventListener listener,
 EventObject event)

Dispatches an event to a specified listener. This method defines how a particular event is delivered to an individual listener. Subclasses must implement this method to define the specific behavior of event delivery.

Parameters:

listener - the event listener to which the event is dispatched

event - the event object to be delivered to the listener

add

public com.vaadin.flow.shared.Registration add(EventListener listener)

Adds a listener to the internal collection of event listeners.

Parameters:

listener - the event listener to be added to the collection

Returns:

a Registration object that can be used to remove the listener

remove

public void remove(EventListener listener)

Removes the specified event listener from the collection of registered listeners. If the listener is not currently registered, no action is taken.

Parameters:

listener - the event listener to be removed from the collection