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POFilter users values on TextField input after a BindDirectional strategy betwen a Slider and min/max TextField
 

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  1. POFilter users values on TextField input after a BindDirectional strategy betwen a Slider and min/max TextField
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    <p>Using two <code>TextField</code> : <code>texMin</code> and <code>texMax</code> , i want to limit min and max values of my doubleSlider control (cf the custom ui control <code>DoubleSlider</code> here : <a href="http://code.google.com/p/javafx-widgets/source/browse/#svn%2Ftrunk%2FDoubleSlider%2Fsrc%2Fdouble_slider" rel="nofollow noreferrer">http://code.google.com/p/javafx-widgets/source/browse/#svn%2Ftrunk%2FDoubleSlider%2Fsrc%2Fdouble_slider</a> ) </p> <p>The DoubleBinded with StringConverter (double to string) works perfectly, but now i don't know how can i filter to get only correct values entered by user in the two <code>TextField</code> after it <code>ENTER</code> keypress..</p> <p>I don't know if a <code>setOnKeyReleasedEvent</code> filter on value entered by user can work with a <code>bindBidirectional</code> on properties. I think the <code>bindBidirectional</code> bypass my filter (fire an event each time the text change), but i'm not sure.</p> <pre><code> def sliderBlockFactory(slider: DoubleSlider): HBox = { val minText = new TextField() val maxText = new TextField() minText.setText(slider.getValue1().toString) maxText.setText(slider.getValue2().toString) slider.value1Property().addListener( new ChangeListener[Number]() { override def changed(ov: ObservableValue[_ &lt;: Number], old_val: Number, new_val: Number) { if (new_val.doubleValue() == null) { minText.setText("") } else { minText.setText(new_val.doubleValue().toString()) } } }) slider.value2Property().addListener( new ChangeListener[Number]() { override def changed(ov: ObservableValue[_ &lt;: Number], old_val: Number, new_val: Number) { if (new_val.doubleValue() == null) { maxText.setText("") } else { maxText.setText(new_val.doubleValue().toString()) } } }) minText.setPrefWidth(40) maxText.setPrefWidth(40) val converter: StringConverter[_ &lt;: Number] = new DoubleStringConverter() Bindings.bindBidirectional(minText.textProperty(), slider.value1Property(), converter.asInstanceOf[StringConverter[Number]]) Bindings.bindBidirectional(maxText.textProperty(), slider.value2Property(), converter.asInstanceOf[StringConverter[Number]]) val uiSliderBlock = new HBox() uiSliderBlock.getChildren.addAll(minText, slider, maxText) uiSliderBlock } def doubleSliderFactory(min: Double, max: Double): DoubleSlider = { val slider = new DoubleSlider() slider.setMin(min) slider.setMax(max) slider.setShowTickLabels(true) slider.setShowTickMarks(true) slider.setMajorTickUnit(50) slider.setMinorTickCount(25) slider.setSnapToTicks(true) slider.setPrefWidth(100) slider.setBlockIncrement(10) slider } val myDoubleSlider = sliderBlockFactory(doubleSliderFactory(0.0, 100.0)) </code></pre> <p><strong>UPDATE 1 :</strong> </p> <p>Thanks to comments, i modify my code source. I giveup DoubleStringConverter because my use case is too complex. I also translate java source code given in comments url into scala : </p> <pre><code>class DoubleTextField(var minValue: Double, var maxValue: Double, val initialValue: Double) extends TextField { require(minValue &lt; maxValue, "DoubleField min value " + minValue + " greater than max value " + maxValue) require(maxValue &gt; minValue, "DoubleField max value " + minValue + " less than min value " + maxValue) //require(!((minValue &lt;= initialValue) &amp;&amp; (initialValue &lt;= maxValue)), "DoubleField initialValue " + initialValue + " not between " + minValue + " and " + maxValue) val value: DoubleProperty = new SimpleDoubleProperty(initialValue) //scala parsing def parseDouble(s: String) = try { Some(s.toDouble) } catch { case _ ⇒ None } def getValue() = value.getValue() def setValue(newValue: Double) = value.setValue(newValue) def valueProperty(): DoubleProperty = value setText(initialValue.toString()) val doubleField: DoubleTextField = this // make sure the value property is clamped to the required range // and update the field's text to be in sync with the value. value.addListener(new ChangeListener[Number]() { override def changed(observableValue: ObservableValue[_ &lt;: Number], oldValue: Number, newValue: Number) { if (newValue == null) { doubleField.setText("") } else { if (newValue.doubleValue() &lt; doubleField.minValue) { value.setValue(doubleField.minValue) return } if (newValue.doubleValue() &gt; doubleField.maxValue) { value.setValue(doubleField.maxValue) return } if (newValue.doubleValue() == 0 &amp;&amp; (textProperty().get() == null || "".equals(textProperty().get()))) { // no action required, text property is already blank, we don't need to set it to 0. } else { doubleField.setText(newValue.toString()) } } } }) // restrict key input to numerals. this.addEventFilter(KeyEvent.KEY_TYPED, new EventHandler[KeyEvent]() { override def handle(keyEvent: KeyEvent) { if (!"0123456789".contains(keyEvent.getCharacter())) { keyEvent.consume() } } }) // i don't want a realtime change on my textfield, // so i prefer a validate method like focusedProperty (see below) /*this.textProperty().addListener( new ChangeListener[String]() { override def changed(observableValue: ObservableValue[_ &lt;: String], oldValue: String, newValue: String) { if (newValue == null || "".equals(newValue)) { value.setValue(0) return } parseDouble(newValue) match { case Some(d: Double) ⇒ if (doubleField.minValue &gt; d || d &gt; doubleField.maxValue) { textProperty().setValue(oldValue) value.set(oldValue.toDouble) } else { value.set(d) } case _ ⇒ oldValue //reset to old value } } })*/ // Detect a change in focus on the text field.. If we lose the focus we take appropriate action // problem with boolean : https://stackoverflow.com/questions/11377350/scala-java-interop-class-type-not-converted this.focusedProperty().addListener( new ChangeListener[java.lang.Boolean]() { db ⇒ override def changed(observable: ObservableValue[_ &lt;: java.lang.Boolean], oldValue: java.lang.Boolean, newValue: java.lang.Boolean) { if (!newValue) { parseDouble(doubleField.textProperty().get()) match { case Some(d: Double) ⇒ if (doubleField.minValue &gt; d || d &gt; doubleField.maxValue) { textProperty().setValue(doubleField.minValue.toString) value.set(textProperty().get().toDouble) } else { value.set(d) } case _ ⇒ println("error") //reset to old value } } } }) } </code></pre> <p>The corrected code source for <code>DoubleSlider</code> update by <code>DoubleTextField</code> :</p> <pre><code>// inspired by : // https://gist.github.com/1962045 // https://stackoverflow.com/questions/14138082/java-fx-bidirectional-bindings-of-different-properties // https://forums.oracle.com/forums/thread.jspa?threadID=2311243 def sliderBlockFactory(slider: DoubleSlider): HBox = { val minText = new DoubleTextField(slider.getMin, slider.getMax, slider.getMin) val maxText = new DoubleTextField(slider.getMin, slider.getMax, slider.getMax) slider.value1Property().addListener( new ChangeListener[Number]() { override def changed(ov: ObservableValue[_ &lt;: Number], old_val: Number, new_val: Number) { if (new_val.doubleValue() == null) { minText.setText("") } else { //set new min value of maxText maxText.minValue = new_val.doubleValue() } } }) slider.value2Property().addListener( new ChangeListener[Number]() { override def changed(ov: ObservableValue[_ &lt;: Number], old_val: Number, new_val: Number) { if (new_val.doubleValue() == null) { maxText.setText("") } else { //set new max value of minText minText.maxValue = new_val.doubleValue() } } }) minText.setPrefWidth(40) maxText.setPrefWidth(40) /*val converter: StringConverter[_ &lt;: Number] = new DoubleStringConverter() Bindings.bindBidirectional(minText.textProperty(), slider.value1Property(), converter.asInstanceOf[StringConverter[Number]]) Bindings.bindBidirectional(maxText.textProperty(), slider.value2Property(), converter.asInstanceOf[StringConverter[Number]]) */ minText.valueProperty().bindBidirectional(slider.value1Property()) maxText.valueProperty().bindBidirectional(slider.value2Property()) val uiSliderBlock = new HBox() uiSliderBlock.getChildren.addAll(minText, slider, maxText) uiSliderBlock } def doubleSliderFactory(min: Double, max: Double): DoubleSlider = { val slider = new DoubleSlider() slider.setMin(min) slider.setMax(max) slider.setShowTickLabels(true) slider.setShowTickMarks(true) slider.setMajorTickUnit(50) slider.setMinorTickCount(25) slider.setSnapToTicks(true) slider.setPrefWidth(100) slider.setBlockIncrement(10) slider } val myDoubleSlider = sliderBlockFactory(doubleSliderFactory(0.0, 100.0)) </code></pre> <p>Result :) </p> <p><img src="https://i.stack.imgur.com/19AoO.png" alt="enter image description here"></p> <p>This code works, values for min and max of each slider controls are updated correctly, but as you can see, when focus is left and if value are bad <strong>i can't retrieve the old value with focused event</strong>. My question is simple, is there any way to get the old values in the textField without using <code>changeListener</code> on <code>textProperty</code> ?</p> <p><strong>Update 2 :</strong> </p> <p>I found my answer here :</p> <p><a href="https://stackoverflow.com/questions/14707550/undo-behavior-on-textfield-value-based-on-value-verification-after-focus-lost">Undo behavior on textField value based on value verification after focus lost</a></p>
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    1. COI created a [sample solution](https://forums.oracle.com/forums/thread.jspa?messageID=10692669) earlier to bind between a Slider and TextField, please take a look at that and see if it helps solve your issue.
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      1. POFilter users values on TextField input after a BindDirectional strategy betwen a Slider and min/max TextField
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    2. COThanks @jewelsea i'm already based my code on your sample ... :] i post question here to see if there is another way to do that, but it seems we're alone ... I found another path to do that here : https://github.com/fxexperience/code/tree/master/FXExperienceControls/src/com/fxexperience/javafx/scene/control
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    3. CO@jewelsea i update my source code with a first working answer, but i need your help about retrieving old values for textField (see update 1)
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