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    <p>as I am currently working on a JavaFX with Scala solution too, I would like to try your example, but I can't get it compiled. Specifically <code>doubleField</code> and <code>value.set</code> are unknown!</p> <p>I have some hints - First: there is an obvious code duplication, that could be easily solved by adding a condition to the case - the first case only holds if the condition (d in range) is fulfilled</p> <pre><code>case Some(d: Double) if (doubleField.minValue &lt;= d &amp;&amp; d &lt;= doubleField.maxValue) ⇒ value.set(d) case _ ⇒ doubleField.getSkin.asInstanceOf[TextInputControlSkin[_, _]].getBehavior.asInstanceOf[TextInputControlBehavior[_]].callAction("Undo") </code></pre> <p>Second: provide a wrapper for anonymous inner classes in Java - for instance the above ChangeListener could be wrapped like this:</p> <pre><code>implicit def unit2ChangeListener[T](f: (ObservableValue[_ &lt;: T], T, T) =&gt; Unit) = new ChangeListener[T] { override def changed(observable: ObservableValue[_ &lt;: T], oldValue: T, newValue: T) { f(observable, oldValue, newValue) } } </code></pre> <p>These implicit conversions could be hidden in a util class (along with a nice unit2EventHandler) and imported to your application. This would lead to something a bit more readable (but still a little painful):</p> <pre><code>myTextField.focusedProperty().addListener( (observable: ObservableValue[_ &lt;: java.lang.Boolean], oldValue: java.lang.Boolean, newValue: java.lang.Boolean) =&gt; if (!newValue) { ... } ) </code></pre> <p>Probably <a href="http://code.google.com/p/scalafx/" rel="nofollow">ScalaFx</a> already provides something like this, but I haven't tried it yet.</p>
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    1. COHi @michael_s, thanks for hints, and sorry for bad copy/paste, i update the source code : `doubleField` = `myTextField` .. If you want to see the real code source sample which work, and if you want to make some revision on it, thanks for the help in this hard way scala + javafx :) https://gist.github.com/reyman/4753927
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