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Oundroni
Asked: 2020-07-01 04:56:30 +0800 CST 2020-07-01 04:56:30 +0800 CST

Calculate the thumb position of a slider in JavaFX

  • 772

I want to place the selected value of a Slideron top of its thumb:

enter image description here

I have entered the following code:

miSlider.valueProperty().addListener(new ChangeListener() {
    @Override
    public void changed(ObservableValue arg0, Object arg1, Object arg2) {

        información.textProperty().setValue(
                String.valueOf((int) miSlider.getValue()));

        // posiciono la información
        información.setPadding(new Insets(0,0,0, 
               (miSlider.getValue() - miSlider.getMax()) * miSlider.getWidth() / 
               (miSlider.getMax()-miSlider.getMin()) + miSlider.getWidth() ));                        
    }
});

The Labelinfo is not placed right above the thumb. How do I get the position of the thumb?

java

1 Answers

  1. Best Answer

    Use getBoundsInParent()and lookUp():

    Bounds dimensiones = slider.lookup(".thumb").getBoundsInParent();

    You will need to apply CSSthe Sliderwith applyCss()before lookUpfor the position to display correctly.

    This answer is a translation of the answer you have in this link along with an example: https://stackoverflow.com/questions/38131485/coordinates-of-slider-thumb-in-javafx

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