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SWT DateTime (GTK) traps TAB traversal inside widget causing infinite internal focus cycling (day/month/year), no TRAVERSE_TAB_NEXT emitted

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#3,411 1 comentario 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
65/100
Tipo de issue
Error
Claridad
Bien especificado
Estado de actividad
Tranquilo
Stack tecnológico
java
Área
desktop-dev

Línea de trabajo

Start in org.eclipse.swt.widgets.DateTime and the GTK-specific backend code that handles key and traverse events. The bug is that TAB is consumed internally instead of being propagated as SWT.TRAVERSE_TAB_NEXT. Look for the event filter or key handling in the GTK DateTime implementation. Verify by running the SWT automated tests for DateTime and focus traversal.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

bug help wanted Linux/GTK

Description
When using org.eclipse.swt.widgets.DateTime on GTK (Linux), the widget consumes TAB key events internally instead of propagating them as SWT traversal events.

As a result, focus never leaves the control and TAB navigation loops between internal fields (day → month → year).

This behavior does not occur on Windows.

Environment

    • All OS
    • Windows
    • Linux
    • macOS

SWT: 3.133.0 (Eclipse 4.39)
Java: OpenJDK 25.0.3
OS: Ubuntu 26.04
Desktop: MATE
Windowing system: X11
GTK: 3.24.52
Locale: es_ES.UTF-8

(and tests in Ubuntu 26.04 Gnome and swt 3.134.0)

Steps To Reproduce

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;

public class DateTimeTabDebug {
    public static void main(String[] args) {

        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new GridLayout(2, false));

        new Label(shell, SWT.NONE).setText("Text 1:");
        Text t1 = new Text(shell, SWT.BORDER);
        t1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

        new Label(shell, SWT.NONE).setText("Date:");
        DateTime dt = new DateTime(shell, SWT.DATE | SWT.DROP_DOWN | SWT.BORDER);
        dt.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

        new Label(shell, SWT.NONE).setText("Text 2:");
        Text t2 = new Text(shell, SWT.BORDER);
        t2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

        shell.pack();
        shell.open();

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

        display.dispose();
    }
}


javac --release 25 \
  -cp org.eclipse.swt.gtk.linux.x86_64-3.133.0.jar \
  DateTimeTabDebug.java


java \
  -cp .:org.eclipse.swt.gtk.linux.x86_64-3.133.0.jar \
  DateTimeTabDebug

Actual Behavior
When pressing TAB:

Focus moves from Text1 → DateTime correctly
Inside DateTime:

  • TAB cycles through internal fields (day → month → year)
  • Focus never leaves the widget
  • No focusLost event is generated
  • No TRAVERSE_TAB_NEXT is received

Debug output shows repeated:

[FILTER TRAVERSE] widget=DateTime detail=0 doit=true
[DATE TRAVERSE] detail=0 doit=true

(detail=0 corresponds to SWT.TRAVERSE_NONE)

The event is repeated indefinitely.

Expected behavior
Pressing TAB inside DateTime should:

  • Move focus to next control (Text2)
  • Generate SWT.TRAVERSE_TAB_NEXT
  • Trigger focusLost on DateTime

Same behavior as on Window
A clear and concise description of what you expected to happen.

Observed Impact

  • Keyboard navigation is broken on GTK
  • Focus becomes trapped inside DateTime
  • Cross-platform inconsistency (Windows vs Linux)
  • No reliable workaround using standard SWT listeners

Additional Notes

  • TraverseListener is triggered but only with SWT.TRAVERSE_NONE (detail=0)
  • KeyListener does not reliably receive TAB before GTK consumes it
  • Issue reproducible in minimal SWT application
  • Likely related to GTK DateTime internal editing of sub-fields

Request

Please confirm whether this is:

  • a known limitation of SWT GTK DateTime, or
  • a regression in SWT GTK event translation layer

and whether there is a recommended workaround or fix planned.

Lenguaje dominante
Java
Estrellas
202
Forks
206
Merge medio
20 h 20 min
PR fusionados (30 d)
113

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