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[GTK] Tree and table only react delayed on mouse selection if drag listener is configured

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#3,452 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
45/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Tranquilo
Stack tecnológico
java
Área
desktop

Línea de trabajo

The report provides a Java reproduction using SWT Tree, Table, and DragSource, but names no repository files or tests. First locate the Linux GTK implementations and related selection/drag tests, then reproduce the behavior with and without the drag listener on Linux. Done means rows become visibly selected and the selection event is sent immediately in both cases.

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

Descripción

Describe the bug
Normally, a Tree or Table immediately selects a row on mouse-down. However, this is not the case any more if a drag listener is added to the tree or table.

To Reproduce

  • run this snippet
import org.eclipse.swt.*;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class TreeTableDnD {

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

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

		final Tree tree = new Tree(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
		for (int i = 0; i < 4; i++) {
			final TreeItem item = new TreeItem(tree, 0);
			item.setText("TreeItem " + i);
		}
		tree.addListener(SWT.Selection, e -> System.out.println("Tree selection changed"));

		final Table table = new Table(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
		final TableColumn column = new TableColumn(table, SWT.DEFAULT);
		column.setText("Column");
		column.setWidth(250);
		table.setHeaderVisible(true);
		for (int i = 0; i < 4; i++) {
			final TableItem item = new TableItem(table, 0);
			item.setText("Item " + i);
		}
		table.addListener(SWT.Selection, e -> System.out.println("Table selection changed"));

//		new DragSource(tree, DND.DROP_MOVE).setTransfer(TextTransfer.getInstance());
//		new DragSource(table, DND.DROP_MOVE).setTransfer(TextTransfer.getInstance());

		shell.setSize(500, 300);
		shell.open();

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

		display.dispose();
	}
}
  • select a tree or table row with a slow mouse click -> the visible selection occurs immediately on mouse-down, the selection event is sent delayed
  • now remove the comments to active the drag listener and try again -> the visually selection occurs delayed and the selection event even more delayed

Expected behavior
The tree and table rows get visually selected immediately and the selection event is sent immediately, independent of a drag listener.

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)
    Tried on Linux Mint (X11)
Lenguaje dominante
Java
Estrellas
202
Forks
206
Merge medio
20 h 21 min
PR fusionados (30 d)
110

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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