Remove padding/margin from JavaFX Label

Question

Is there a way to remove the default space (padding/margin) that JavaFX label adds? I want to get rid of the space displayed between the black lines on the image below:

Answer 1

For me it was easiest to just use setPadding.

label.setPadding(new Insets(-2,0,0,0)); //top, right, bottom, left

This way I did not have to deal with the css-style sheet.

Answer 2

You can achieve that by adding -fx-padding: -10 0 0 0; to the list of your styles.

For more flexible solution you can use FontMetrics information:

FontMetrics metrics = Toolkit.getToolkit().getFontLoader().getFontMetrics(label.getFont());
label.setPadding(new Insets(-metrics.getDescent(), 0, 0, 0));

NB: You need to call that code after scene.show(). Before that graphics engine is not ready to provide correct metrics.

Answer 3

One of the more dynamic ways to do this is to use a Text instead of a Label and set the boundsType as VISUAL. This results in a Text without any padding on the any of the sides of the Text, irrespective of the font size.

Text text = new Text();
text.setBoundsType(TextBoundsType.VISUAL);

Answer 4

For more details see my post here Substructure styling

You could also do it like this after the stage.show().

With the example of an separator:

Separator separator = new Separator();
separator.setStyle(""
    + "-fx-border-width: 1px;"
    + "-fx-border-color: black;"
    + "-fx-padding: 0px;"
    + "");

stage.show()

Do

Node line = separator.lookup(".line");
line.setStyle(""
    + "-fx-border-insets: 0px;"
    + "-fx-border-width: 0px;"
    + "");

or this way index 0 because it has only one element at index 0 which is an Region with style calss .line

separator.getChildrenUnmodifiable().get(0).setStyle(""
    + "-fx-border-insets: 0px;"
    + "-fx-border-width: 0px;"
    + "");