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Home » Eclipse Projects » Standard Widget Toolkit (SWT) » Moving a shell from a high-dpi to a low-dpi monitor does not rescale the shell and its contents
Moving a shell from a high-dpi to a low-dpi monitor does not rescale the shell and its contents [message #1836430] Sun, 03 January 2021 22:23
Nicolas Falliere is currently offline Nicolas FalliereFriend
Messages: 3
Registered: March 2015
Junior Member
Hello,

The problem manifests itself when moving a simple Shell from the high-dpi primary display to an external monitor (standard dpi). The Shell and its contents are not rescaled when on the secondary monitor. SWT.ZoomChanged is received as expected, but I do not know how to act on it, I am not seeing any method on Shell that seems to perform rescaling. Related to that: Eclipse does auto-rescale additional windows and shells! Is it done manually then? Is there sample code out there showing how to do this reliably and on all systems? (GTK, etc.)

Thanks,
(Also, I apologize if you have seen this on SO, it's a repost of https://stackoverflow.com/questions/65547072/moving-a-shell-from-a-high-dpi-to-a-low-dpi-monitor-does-not-rescale-the-shell-a, which it seems is not going anywhere - so I thought it'd be more appropriate here.)

Test system: Win 10
Sample code:
public class ShellTest {
public static void main(String[] args) {
    final Display display = Display.getDefault();

    final Shell shell = new Shell(display, SWT.SHELL_TRIM);
    shell.setLayout(new GridLayout());

    shell.addListener(SWT.ZoomChanged, new Listener() {
        @Override
        public void handleEvent(Event event) {
            System.out.println("ZoomChanged: " + event);
        }
    });

    Button btn = new Button(shell, SWT.PUSH);
    btn.setText("Test");

    shell.open();
    shell.layout();
    while(!shell.isDisposed()) {
        if(!display.readAndDispatch()) {
            display.sleep();
        }
    }
}
}
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