beansbinding est l'implémentation associée à cette spec et est utilisé dans NetBeans, ce qui prouve une bonne maturité de la techno. Seulement le projet semble "dormant", et la JSR associée n'a pas bougé depuis 2006. Pourtant le mot clé "bind" utilisé par JavaFX montre bien l'importance de ce concept pour les IHM
gwt-beans-binding est un portage de la JSR 295 (ou plutôt de ses concepts puisqu'elle n'est ni aboutie, ni publique) pour GWT. La mise en oeuvre est très simple. Pour lier deux textBox par exemple, il suffit de déclarer :
Binding.createAutoBinding( READ_WRITE,
textBox, BeanProperty.create( "text" ),
model, BeanProperty.create( "name" ) );
L'équivalent codé "à la main" nécessite de définit de nombreux PropertyChangeListeners (NB: quand seront-ils supportés en standard par GWT ?).
Pourquoi se focaliser sur ce projet, encore en version 0.2, alors que d'autres options comme Gwittir offrent des solutions comparables ?
- D'une part, parce que quelque soit l'évolution de cette JSR, elle sera toujours considérée si un nouveau groupe s'attaque à ce problème de data-binding en Java.
- D'autre part, parce qu'elle propose une API simple et focalisée sur cette unique tâche.
- Enfin, parceque le développeur de cette petite librairie a l'air très motivé !
Pour voir gwt-beans-binding à l'oeuvre : démo
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