eu.webtoolkit.jwt
Class AbstractEventSignal.PreLearnListener

java.lang.Object
  eu.webtoolkit.jwt.AbstractEventSignal.LearningListener
      eu.webtoolkit.jwt.AbstractEventSignal.PreLearnListener

All Implemented Interfaces:

Signal.Listener

Enclosing class:

AbstractEventSignal

public abstract static class AbstractEventSignal.PreLearnListener
extends AbstractEventSignal.LearningListener
implements Signal.Listener

A listener whose JavaScript behavior is learned in advance.

The JavaScript behavior is learned by invoking AbstractEventSignal.LearningListener.trigger() and monitoring its effect on the widget tree. In this way, the visual effect of the event listener happens immediately in response to an event, without requiring a server round-trip. Yet, the listener is still run on the server as well, whenever the listener is triggered.

The undoTrigger() method is called after learning and should undo the effect of AbstractEventSignal.LearningListener.trigger().

See Also:

AbstractEventSignal.addListener(WObject, LearningListener)

Constructor Summary

AbstractEventSignal.PreLearnListener()

Method Summary

abstract void

undoTrigger() Undoes the signal trigger.

Methods inherited from class eu.webtoolkit.jwt.AbstractEventSignal.LearningListener

trigger

Methods inherited from class java.lang.Object

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

Methods inherited from interface eu.webtoolkit.jwt.Signal.Listener

trigger

Constructor Detail

AbstractEventSignal.PreLearnListener

public AbstractEventSignal.PreLearnListener()

Method Detail

undoTrigger

public abstract void undoTrigger()

Undoes the signal trigger.

This method undoes the effect of AbstractEventSignal.LearningListener.trigger(), and is used when the listener was triggered for learning the JavaScript behavior.

Specified by:

undoTrigger in class AbstractEventSignal.LearningListener