How to position the Stage at the first available place on the screen

Question

Im creating a Stage,
but for any reason when I dont define x,y it shows in different places on the screen, and sometimes outside of the screen
if I set x=0 and y=0 I have problems, because some user, like me, use the taskbar on the top of the screen,
anybody knows how do workaround this ?
this is the code of my Stage
public class Game extends Stage {
    public var tick: Timeline = Timeline {
        repeatCount: Timeline.INDEFINITE
        keyFrames: [
            KeyFrame {
                time: 0.01s
                action: function() {
                    mainLoop();
    // main game loop
    public function mainLoop(){
        for (node in scene.content) {
            if( node instanceof Updatable){
                (node as Updatable).update();
    public function play(){
        tick.play();
}and this is how I'm using it
var game: Game = Game {
    title: "Cabecudinhos, episódio 1 o ataque dos mosquitos"
    x: 0
    y: 0
    width: 800
    height: 600
    scene: Scene {
        content: [
            background
            littleBox
function run(__ARGS__ : String[]) {
    game.play();
    soundtrack.play();
}

Answer 1

You can ask Java for that.
You can just center the stage on screen, that's quite easy given the screen dimensions:
import java.awt.*;
var dim: Dimension = Toolkit.getDefaultToolkit().getScreenSize();
println("Screen is {dim.getWidth()}x{dim.getHeight()}");I suppose it works for main screen, there is code to get the info for all screens (if several are connected).
If you need to know the placements of the taskbar and other bars, you need to get the insets, which is a bit more convoluted.
var ge: GraphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();
var gsl: GraphicsDevice[] = ge.getScreenDevices();
var gcl: GraphicsConfiguration[] = gsl[0].getConfigurations();
var ins: Insets = Toolkit.getDefaultToolkit().getScreenInsets(gcl[0]);
println("Insets are T {ins.top}, L {ins.left}, B {ins.bottom}, R {ins.right}");It shows B 34 for my setting and T 34 if Windows' taskbar is on top, etc.