Hopefully easy answer. How can I get a slider to only have integer values?

Question

I'm trying out a slider from the example page to let users chooice 5-100, but the slider also lets values be doubles. Is there any way to limit the slider to only lock on to values when they're doubles?

Answer 1

This seems to work, the code below forces the slider position to be a power of 2 (1,2,4,8,16,32,64,128).
new Slider(1, 128, 64) {{
        valueProperty().addListener(new ChangeListener<Number>() {
          @Override
          public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
            double value = (Double)newValue;
            int closestPowerOf2 = (int)Math.round(Math.log(value) / Math.log(2));
            if((int)value != (1 << closestPowerOf2)) {
              setValue(1 << closestPowerOf2);
        setMajorTickUnit(25);
        setShowTickMarks(true);
        setShowTickLabels(true);
}};