On Windows it is not restricted AFAIK, moving a screen anywhere is
allowed, and one can also drag windows beyond those limits. When a
monitor is added/removed Windows may however decide to reshuffle all
your Windows (or randomly if a monitor is slow to respond when waking
from sleep) to ensure they're all visible.
I think Windows just treats the screen space as infinite with the
monitors being views into it; overlaps and gaps are allowed, although
you need some tricks to get your screens setup that way.
Not sure what you find odd about the Windows behaviour?
--John
On 09/04/2025 13:57, Thiago Milczarek Sayão wrote:
> Thanks John!
>
> I did not calculate the center, I just wanted to know the behaviour of
> setX() outside bounds and within
> bounds of the last screen.
>
> The GNOME window manager on Linux restricts programmatic movement of
> windows to prevent them
> from being moved outside screen boundaries. However, it allows users
> to drag windows beyond these limits.
> I find it odd that the maximum movement is restricted to the bounds of
> the first screen, while it would be more
> intuitive for it to be based on the last screen.
>
> The Windows behaviour also seems odd.
>
> -- Thiago
>
> Em qua., 9 de abr. de 2025 às 08:28, John Hendrikx
> <john.hendr...@gmail.com> escreveu:
>
> Small addition; the 3520 button moved the top left of the Window
> to the middle of the right screen, but the window as a whole was
> not centered.
>
> --John
>
> On 09/04/2025 13:22, John Hendrikx wrote:
>>
>> 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);
>>> }
>>> }
>>>
