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[Win32] Table: first row partly hidden behind header

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#3,430 6 comentarios 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
52/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
java
Área
desktop

Línea de trabajo

Run the provided Java reproduction on Windows and trace the SWT Table behavior involved in changing from multiple virtual rows to a single selected row. The issue does not name implementation files or tests, so first locate the Win32 Table code and related tests. Done means the single item is fully visible below the header after selecting “Second.”

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

Descripción

Describe the bug
It might happen that setting an owner-drawn table a single item it will not become fully visible, hidden behind the table header, though the table is large enough to show it.

To Reproduce

import java.util.ArrayList;

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class SingleTableItemBehindHeader {

	public static void main(String[] args) {
		final Display display = new Display();

		final Shell shell = new Shell(display);
		shell.setLayout(new FillLayout(SWT.HORIZONTAL));

		final List list = new List(shell, SWT.BORDER);
		list.setItems("First", "Second");

		final java.util.List<String> rows = new ArrayList<>();
		final Table table = new Table(shell, SWT.FULL_SELECTION | SWT.VIRTUAL | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
		table.setHeaderVisible(true);
		final TableColumn column = new TableColumn(table, SWT.LEFT);
		column.setText("Column");
		column.setWidth(350);
		table.addListener(SWT.SetData, event -> {
			final TableItem tableItem = (TableItem)event.item;
			tableItem.setData(rows.get(event.index));
		});
		final Listener listener = event -> {
			switch (event.type) {
			case SWT.MeasureItem -> {
				final String text = (String)event.item.getData();
				final Point size = event.gc.stringExtent(text);
				event.width = size.x + 4;
				event.height = size.y + 4;
			}
			case SWT.PaintItem -> {
				final String text = (String)event.item.getData();
				event.gc.drawString(text, event.x + 2, event.y + 2, true);
			}
			}
		};
		table.addListener(SWT.MeasureItem, listener);
		table.addListener(SWT.PaintItem, listener);

		list.addListener(SWT.Selection, event -> {
			final int index = list.getSelectionIndex();
			switch (index) {
			case 0 -> {
				setTableRows(java.util.List.of("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11"), rows, table);
				table.setSelection(11);
			}
			case 1 -> {
				setTableRows(java.util.List.of("11"), rows, table);
				table.deselectAll();
				table.select(new int[] {0});
			}
			default -> {
				setTableRows(java.util.List.of(), rows, table);
			}
			}
		});

		shell.setSize(600, 200);
		shell.open();

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

		display.dispose();
	}

	private static void setTableRows(java.util.List<String> values, java.util.List<String> rows, Table table) {
		rows.clear();
		rows.addAll(values);

		table.setItemCount(rows.size());
		table.clearAll();
	}
}
  • run this snippet
  • select the "First" row on the left; this will fill the table on the right and select its last item
Image
  • select the "Second" row on the left; this will set the table on the right a single item and select it; but this single item it partly hidden behind the header
Image

Expected behavior
After selecting "Second", the first table item should be fully visible

Environment:

  1. Select the platform(s) on which the behavior is seen:
    • All OS
    • Windows
    • Linux
    • macOS
  1. Additional OS info (e.g. OS version, Linux Desktop, etc)
    Windows 11 25H2

Workaround
None

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

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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