Help test the behavior of a multi-screen setup with both Mac and Windows

[John Hendrikx]

Hi Thiago,

I ran this on Windows.  My monitor setup is:

Left: 3840x2160 (150%) -- top left coordinate (-2560, 0) (-2560 because
of scaling)
Middle: 3840x2160 (150%) -- this one has a top left coordinate of (0, 0)
Right: 1920x1200 (100%) -- this one has a top left coordinate of (2560, 0)

When started, the program appeared perfectly centered on the middle screen.

Your program showed buttons: 4480 and 3520

The 4480 button moved the Window far too the right, off screen and I had
to stop the program

The 3520 button moved the Window to the Right monitor, but it was not
centered nicely.

I added a `peek(System.out::println)` on the screens stream.  These are
my screens:

Rectangle2D [minX=0.0, minY=0.0, maxX=2560.0, maxY=1440.0, width=2560.0,
height=1440.0]

Rectangle2D [minX=2560.0, minY=-194.0, maxX=4480.0, maxY=1006.0,
width=1920.0, height=1200.0]

Rectangle2D [minX=-2560.0, minY=6.0, maxX=0.0, maxY=1446.0,
width=2560.0, height=1440.0]

--John

On 09/04/2025 12:55, Thiago Milczarek Sayão wrote:
> Hi,
>
> Could anyone with a multi-screen setup on Mac and/or Windows please
> share the results of the two buttons on this sample app? Your feedback
> would be greatly appreciated!
>
> On Ubuntu 24.04 the first button moves the Stage to the end of the
> first screen (bit weird). 
> The second work as expected, it gets moved to the start of the center
> of the last screen.
>
> Thanks!
>
> import javafx.application.Application;
> import javafx.geometry.Pos;
> import javafx.geometry.Rectangle2D;
> import javafx.scene.control.Button;
> import javafx.scene.layout.VBox;
> import javafx.stage.Screen;
> import javafx.stage.StageStyle;
> import javafx.application.Platform;
> import javafx.scene.Scene;
> import javafx.scene.layout.StackPane;
> import javafx.scene.paint.Color;
> import javafx.stage.Stage;
>
> import java.util.Comparator;
>
> public class TestScreenBounds extends Application {
>
>     @Override
>     public void start(Stage stage) {
>         stage.setTitle("Move Outside Bounds");
>         Rectangle2D bounds = Screen.getScreens().stream()
>                 .map(Screen::getBounds)
>                 .sorted(Comparator.comparingDouble(Rectangle2D::getMaxX).reversed())
>                 .findFirst()
>                 .orElseThrow();
>
>         Button btn = new Button("Move To " + bounds.getMaxX());
>         btn.setOnAction(event -> stage.setX(bounds.getMaxX()));
>
>         double middleLastScreen = bounds.getMinX() + bounds.getWidth() / 2;
>
>         Button btn2 = new Button("Move To " + middleLastScreen);
>         btn2.setOnAction(event -> stage.setX(middleLastScreen));
>
>         VBox root = new VBox(btn, btn2);
>         root.setFillWidth(true);
>         root.setAlignment(Pos.CENTER);
>         Scene scene = new Scene(root, 300, 300);
>         stage.setScene(scene);
>         stage.show();
>     }
>
>     public static void main(String[] args) {
>         launch(TestScreenBounds.class, args);
>     }
> }
>
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