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[GTK] problematic runtime behavior in table when deleting many rows

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还没有人认领这个 Issue。

评估

难度
4/5
预计耗时
3-5 天
新手友好度
55/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
java
领域
frontend

调研方向

Start by reproducing the hang with the supplied GTK3 Java snippet: create a multi-select virtual table, select a row that will be removed, then shrink its item count from 50,000 to 5. Compare the timing with only the first row selected and trace the GTK table item-count and selection-removal paths. Done means shrinking rows intersecting the selection is comparably fast and the behavior is covered by a regression test.

由索引模型根据 Issue 内容生成。

描述

On GTK3, deleting many rows from a table results in a hang if

  • SWT_MULTI is set
  • the rows to be deleted intersect with the selection of the table
  • the number of rows to be deleted is relatively large

Snippet:

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

public class GtkTablePerformanceIssue {
	private static final int HUGE_COUNT = 500_000;
	private static final int LARGE_COUNT = 50_000;
	private static final int SMALL_COUNT = 5;

	public static void main(String[] args) {
		final Display display = new Display();
		final Shell shell = new Shell(display);
		shell.setText("GTK Table remove performance");
		shell.setLayout(new GridLayout(1, false));

		final Table table = new Table(shell, SWT.VIRTUAL | SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION);
		table.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
		table.addListener(SWT.SetData, event -> {
			final TableItem item = (TableItem)event.item;
			item.setText("Item " + table.indexOf(item));
		});

		final Label explanation = new Label(shell, SWT.NONE);
		explanation.setText("When shrinking, select a row which won't exist after the shrink.");

		final Button huge = new Button(shell, SWT.PUSH);
		huge.setText("Reset to " + HUGE_COUNT + " rows");
		huge.addListener(SWT.Selection, event -> table.setItemCount(HUGE_COUNT));

		final Button large = new Button(shell, SWT.PUSH);
		large.setText("Reset to " + LARGE_COUNT + " rows");
		large.addListener(SWT.Selection, event -> table.setItemCount(LARGE_COUNT));

		final Button shrink = new Button(shell, SWT.PUSH);
		shrink.setText("Shrink to " + SMALL_COUNT + " rows");
		final Label result = new Label(shell, SWT.NONE);
		result.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
		shrink.addListener(SWT.Selection, event -> {
			final long start = System.nanoTime();
			table.setItemCount(SMALL_COUNT);
			final long elapsedMillis = (System.nanoTime() - start) / 1_000_000;
			result.setText("setItemCount(" + SMALL_COUNT + "): " + elapsedMillis + " ms");
			result.getParent().layout();
		});

		table.setItemCount(LARGE_COUNT);
		table.select(8);
		shell.setSize(500, 400);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
		display.dispose();
	}
}

Expected behavior
The entries should be removed as fast as they are when only the first row is selected.

主要语言
Java
星标
202
派生
206
平均合并
16 小时 56 分钟
30 天内合并 PR
110

环境准备

  • 没有 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 阅读贡献指南

从这里开始

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  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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