CODEWITHSUNDEEP
javajavafx
Aditya Singh
Aditya Singh

Reputation: 2443

Inverting javafx.scene.control.Slider

I need to invert a Slider in javafx.

This is how I built the slider: 

Slider slide = new Slider();
slide.setPrefHeight(height);
slide.setMin(0);
slide.setMax(100);
slide.setOrientation(javafx.geometry.Orientation.HORIZONTAL);
slide.setShowTickLabels(true);
slide.setShowTickMarks(true);
slide.setSnapToTicks(true);

This code creates a horizontally aligned slider from value 0 to 100.
But I would like to invert it. As in, place it horizontally but display values from 100 to 0. and not 0 to 100.

Any help? Thanks in advance.

Upvotes: 1

Views: 1199

Answers (1)

José Pereda
José Pereda

Reputation: 45456

One easy way to invert the slider, without actually doing it, is by using a custom label formatter. Then you just need to take the value and revert it too.

Something like this:

private final DecimalFormat df = new DecimalFormat( "#,##0.00" );
private final double MIN = 0d;
private final double MAX = 100d;

@Override
public void start(Stage primaryStage) {

    VBox vbox=new VBox(20);
    vbox.setPadding(new Insets(20));

    Slider slide = new Slider();
    slide.setPrefSize(300,100);
    slide.setMin(MIN);
    slide.setMax(MAX);
    slide.setOrientation(javafx.geometry.Orientation.HORIZONTAL);
    slide.setShowTickLabels(true);
    slide.setShowTickMarks(true);
    slide.setSnapToTicks(true);
    slide.setLabelFormatter(new StringConverter<Double>(){

        @Override
        public String toString(Double object) {
            return df.format(MAX-object+MIN);
        }

        @Override
        public Double fromString(String string) {
            throw new UnsupportedOperationException("Not supported yet."); 
        }

    });

    Label label = new Label("Value: ");
    slide.valueProperty().addListener((ov,n,n1)->
          label.setText("Value: "+(MAX-n1.doubleValue()+MIN)));
    vbox.getChildren().addAll(slide, label);

    Scene scene = new Scene(vbox, 400, 200);
    primaryStage.setScene(scene);
    primaryStage.show();
}

Upvotes: 2

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