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[MacOS] Table is rendered incompletely on mouse-down

Aperta
  • Qualcosa non va?
#3,311 4 commenti 0 reazioni 0 assegnatari Vedi su GitHub

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
45/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Tranquilla
Stack tecnologico
java, macos
Ambito
desktop

Direzione di ricerca

Start by running the supplied Snippet395 example on macOS and reproduce the incomplete table rendering while holding the mouse button on the left list. Read the SWT table repaint and selection-handling paths implicated by the example; the issue does not name source files or tests. Done means all table items render completely while the button is held and remain correct after release.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Describe the bug
Table repaint triggered from selection listener of another control is rendered incompletely while mouse button is held.

To Reproduce

/*******************************************************************************
 * Copyright (c) 2026 Vasili Guelvich and others
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Table example: repaint triggered from selection listener of another control.
 *
 * Demonstrates a bug where table repaint is rendered incompletely while the
 * mouse button is held down. Click and hold items in the left list and observe
 * the right table.
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @see <a href="https://github.com/eclipse-platform/eclipse.platform.swt/issues/3311">Issue 3311</a>
 */
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet395 {

	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setText("Table SetInput on Selection - Bug 3311");
		shell.setMinimumSize(300, 300);
		shell.setLayout(new FillLayout());

		String[][] data = {
			{"1 very long long long long long long string 1", "2 very long long long long long long string 2"},
			{"1 short string 1", "2 short string 2"},
			{"3 short string 4", "4 short string 5"}
		};
		String[] labels = {"long values", "short values", "2 short values 2"};
		String[][] currentData = {null};

		List selector = new List(shell, SWT.BORDER | SWT.SINGLE);
		selector.setItems(labels);

		Table table = new Table(shell, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER | SWT.VIRTUAL | SWT.FULL_SELECTION);

		table.addListener(SWT.SetData, event -> {
			TableItem ti = (TableItem) event.item;
			int index = table.indexOf(ti);
			if (currentData[0] != null && index < currentData[0].length) {
				ti.setText(currentData[0][index]);
			}
		});

		selector.addListener(SWT.Selection, event -> {
			display.asyncExec(() -> {
				if (table.isDisposed()) return;
				try {
					table.setRedraw(false);
					int index = selector.getSelectionIndex();
					currentData[0] = index >= 0 ? data[index] : null;
					table.setItemCount(currentData[0] != null ? currentData[0].length : 0);
					table.clearAll();
				} finally {
					table.setRedraw(true);
				}
			});
		});

		shell.setSize(400, 300);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
		display.dispose();
	}

}
  • Click every item in left pane a few times
  • Click and hold every item in left pane, observe right pane
  • Try click-and-hold second (middle) item multiple times

Expected behavior
All items are rendered the mouse button is pushed, nothing happens when button is released.

Observed behavior
Right pane renders random prefixes of data. Lines have incomplete/truncated symbols at the end.
Rendering completes when mouse button is released.

Screenshots

https://github.com/user-attachments/assets/012af415-50f6-43ce-a933-141034844fc5

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)
    MacOS: 26.4.1 (25E253)

  2. JRE/JDK version

openjdk 21.0.10 2026-01-20 LTS
OpenJDK Runtime Environment Temurin-21.0.10+7 (build 21.0.10+7-LTS)
OpenJDK 64-Bit Server VM Temurin-21.0.10+7 (build 21.0.10+7-LTS, mixed mode, sharing)
otool -l /Library/Java/JavaVirtualMachines/temurin-21.jdk/Contents/Home/bin/java | grep sdk
      sdk 14.4

Version since
Unknown

Workaround (or) Additional context
Originally found in https://github.com/eclipse-platform/eclipse.platform.swt/pull/3260
Reproduces more consistently with eGit

Lingua principale
Java
Stelle
202
Fork
206
Merge medio
14h 7m
PR unite (30g)
103

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