Spacing of the device-independent?

I'm finally Learning JavaFX for real, now that it is a part of Java 8. I need to update the examples of Core Java Java 8 which lay in the Swing, and I really don't won't use Swing.

So in my first example, I run a question that I don't know how to answer. I have a row of buttons, and I do

HBox buttons = new HBox();

buttons.getChildren () .addAll (red, green, blue);

But it's not good. The buttons are right next to each other. In the documentation of Oracle (http://docs.oracle.com/javafx/2/layout/builtin_layouts.htm), which they call buttons.setSpacing (10). But what is 10? The javadoc for setSpacing is pretty useless. Is - this 10 pixels? That would be bad, in the era of the screens of the retina. Or is there a scale independent of the device, like on Android?

Really, I want to know is how a developer should space a lot of buttons in an independent way of resolution. Preferably without a number magic for example 10.

Thank you

Cay

Another very interesting article is:

JavaFX DPI scaling. Kynosarges Weblog

Tags: Java

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