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Window & Dynamic Size List Virtualization Causes Mobile Safari IOS Scroll Momentum Interruption

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
react, typescript

调研方向

从提供的 CodeSandbox 复现和 useWindowVirtualizer 示例开始,在具有动态尺寸项目的 Mobile iOS Safari 上进行测试。调查被虚拟化的已测量元素与窗口滚动惯性之间的交互;完成标准是复现能够在虚拟化保持活动的同时保留平滑的惯性滚动。

由索引模型根据 Issue 内容生成。

描述

Describe the bug

By using the useWindowVirtualizer hook to apply virtualization for list items with different heights in relation to window scrolling, when you scroll, the virtualization behavior will occur.

Items that no longer need to be rendered will disappear from the DOM, and the list items corresponding to the visible indices will begin to appear in the DOM.

On Mobile iOS Safari, momentum scrolling triggered by user gestures works, but when combined with virtualization, the momentum effect fails to end smoothly and instead stutters or breaks abruptly. Is there a way to resolve this issue?

import "./styles.css";
import { useWindowVirtualizer } from "@tanstack/react-virtual";

const createRandomHeights = (
  min: number,
  max: number,
  count: number = 1000
) => {
  const heights = [];
  for (let i = 0; i < count; i++) {
    heights.push(Math.floor(Math.random() * (max - min + 1) + min));
  }
  return heights;
};

const randomHeights = createRandomHeights(100, 400);
const colors = ["red", "yellow", "blue"];

export default function App() {
  const virtualizer = useWindowVirtualizer({
    count: 1000,
    estimateSize: () => 400,
    overscan: 5,
    scrollMargin: 0,
  });

  const virtualItems = virtualizer.getVirtualItems();

  return (
    <div>
      <div
        style={{
          height: `${virtualizer.getTotalSize()}px`,
          position: "relative",
          width: "100%",
        }}
      >
        <div
          style={{
            transform: `translateY(${
              (virtualItems[0]?.start ?? 0) - virtualizer.options.scrollMargin
            }px)`,
            position: "absolute",
            left: "0",
            top: "0",
            width: "100%",
          }}
        >
          {virtualItems.map((virtualItem) => {
            return (
              <div
                key={virtualItem.key}
                data-index={virtualItem.index}
                ref={virtualizer.measureElement}
                style={{
                  paddingTop: "40px",
                }}
              >
                <div
                  style={{
                    height: randomHeights[virtualItem.index],
                    backgroundColor: colors[virtualItem.index % 3],
                  }}
                ></div>
              </div>
            );
          })}
        </div>
      </div>
    </div>
  );
}

Your minimal, reproducible example

https://codesandbox.io/p/sandbox/qhkvyz

Steps to reproduce
  1. Go to CodeSandbox Link
  2. Scroll down Preview Page
  3. As you scroll, the momentum scroll stops occurring and the scrolling becomes increasingly choppy.
Expected behavior

I hope to maintain a seamless momentum scroll experience.

How often does this bug happen?

Every time

Screenshots or Videos

https://github.com/user-attachments/assets/2b27fcd6-e3de-449b-ac20-2633d76619d3

https://github.com/user-attachments/assets/166be2b0-cab1-495a-a9e1-9b770e31c1fc

Platform
  • OS: IOS
  • Browser: Safari
  • Version: 18.1, 17.6.1
tanstack-virtual version

v3.10.6

TypeScript version

v5.4.5

Additional context

It seems that the CodeSandbox link is difficult to run on Mobile iOS Safari at the moment. However, you can reproduce the issue by running the attached source code.

Terms & Code of Conduct
  • I agree to follow this project's Code of Conduct
  • I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.
主要语言
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环境准备

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  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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