eu.vaadinonkotlin

Class Listeners<T extends Serializable>

eu.vaadinonkotlin.Listeners<T>

public class Listeners<T extends Serializable>

Allows you to add listeners for a particular event into your component.

Say that you have a click listener:

interface OnClickListener { fun onClick(button: Int) }

You can add support for click listeners into your Button component easily:

class Button {
    val onClickListeners = listeners()
}

The clients can then simply register their listeners as follows:

val button = Button()
button.onClickListeners.add(object : OnClickListener {})

The button can fire an event for all listeners as follows:

onClickListeners.fire.onClick(2)

Constructor Summary

Constructors

Constructor and Description
Listeners(kotlin.reflect.KClass<T> listenerType) Allows you to add listeners for a particular event into your component.

Method Summary

Modifier and Type	Method and Description
void	add(T listener) Registers a new listener. Registering same listener multiple times has no further effect.
T	getFire() Use the returned value to fire particular event to all listeners.
kotlin.reflect.KClass<T>	getListenerType()
void	remove(T listener) Removes the listener. Removing same listener multiple times has no further effect. Does nothing if the listener has not yet been registered.

Constructor Detail

Listeners

public Listeners(kotlin.reflect.KClass<T> listenerType)

Allows you to add listeners for a particular event into your component.

Say that you have a click listener:

interface OnClickListener { fun onClick(button: Int) }

You can add support for click listeners into your Button component easily:

class Button {
    val onClickListeners = listeners()
}

The clients can then simply register their listeners as follows:

val button = Button()
button.onClickListeners.add(object : OnClickListener {})

The button can fire an event for all listeners as follows:

onClickListeners.fire.onClick(2)

Method Detail

add

public void add(T listener)

Registers a new listener. Registering same listener multiple times has no further effect.

The equality of the listener is measured by using the standard Any.equals and Any.hashCode.

See Also:

Any.equals, Any.hashCode

remove

public void remove(T listener)

Removes the listener. Removing same listener multiple times has no further effect. Does nothing if the listener has not yet been registered.

The equality of the listener is measured by using the standard Any.equals and Any.hashCode.

See Also:

Any.equals, Any.hashCode

getFire

public T getFire()

Use the returned value to fire particular event to all listeners.

Returns a proxy of type T. Any method call on this proxy is propagated to all listeners.

getListenerType

public kotlin.reflect.KClass<T> getListenerType()