com.vaadin.terminal.gwt.client.


Class EventHelper

java.lang.Object
  com.vaadin.terminal.gwt.client.EventHelper


public class EventHelper
extends Object

Helper class for attaching/detaching handlers for Vaadin client side components, based on identifiers in UIDL. Helpers expect Paintables to be both listeners and sources for events. This helper cannot be used for more complex widgets.

Possible current registration is given as parameter. The returned registration (possibly the same as given, should be store for next update.

Pseudocode what helpers do: 

 
 if paintable has event listener in UIDL
      if registration is null
              register paintable as as handler for event
      return the registration
 else 
      if registration is not null
              remove the handler from paintable
      return null

Constructor Summary
EventHelper()
           
 
Method Summary
static com.google.gwt.event.shared.HandlerRegistration updateBlurHandler(Paintable paintable, ApplicationConnection client, com.google.gwt.event.shared.HandlerRegistration handlerRegistration)
           
static com.google.gwt.event.shared.HandlerRegistration updateFocusHandler(Paintable paintable, ApplicationConnection client, com.google.gwt.event.shared.HandlerRegistration handlerRegistration)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

EventHelper

public EventHelper()
Method Detail

updateFocusHandler

public static com.google.gwt.event.shared.HandlerRegistration updateFocusHandler(Paintable paintable,
                                                                                 ApplicationConnection client,
                                                                                 com.google.gwt.event.shared.HandlerRegistration handlerRegistration)

updateBlurHandler

public static com.google.gwt.event.shared.HandlerRegistration updateBlurHandler(Paintable paintable,
                                                                                ApplicationConnection client,
                                                                                com.google.gwt.event.shared.HandlerRegistration handlerRegistration)