react / react/react-native

Using absolute positioning, when the parent element has padding, the width height of the current element is incorrectly laid out using a percentage layout

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描述

Description
/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 */

import React from 'react';
import {
  SafeAreaView,
  ScrollView,
  StatusBar,
  useColorScheme,
  View,
} from 'react-native';

function App(): React.JSX.Element {
  const isDarkMode = useColorScheme() === 'dark';

  const backgroundStyle = {
    backgroundColor: '#eee',
  };

  return (
    <SafeAreaView style={backgroundStyle}>
      <StatusBar
        barStyle={isDarkMode ? 'light-content' : 'dark-content'}
        backgroundColor={backgroundStyle.backgroundColor}
      />
      <ScrollView>
        <View
          style={{
            backgroundColor: '#000',
            height: 300,
            paddingTop: 200,
            paddingLeft: 200
          }}>
          <View style={{
            position: 'absolute',
            // width height 100%会排除父元素的padding
            width: '100%', height: '100%', left: 0, top: 0,
            backgroundColor: '#666'
          }} />
        </View>
      </ScrollView>
    </SafeAreaView>
  );
}

export default App;

WX20240909-101807

In the new architecture, I set the height to 100%, but its height is not equal to the height of the parent container, but will subtract the padding of the parent container

Steps to reproduce

1

React Native Version

0.75.2

Affected Platforms

Runtime - Android, Runtime - iOS

Areas

Fabric - The New Renderer

Output of npx react-native info
System:
  OS: macOS 14.5
  CPU: (16) x64 Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz
  Memory: 35.26 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.20.3
    path: /private/var/folders/rf/gd60z12164z72bny7z_0d4f80000gn/T/xfs-de932bea/node
  Yarn:
    version: 3.6.4
    path: /private/var/folders/rf/gd60z12164z72bny7z_0d4f80000gn/T/xfs-de932bea/yarn
  npm:
    version: 10.7.0
    path: ~/.nvm/versions/node/v18.20.3/bin/npm
  Watchman:
    version: 2024.07.15.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /usr/local/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.5
      - iOS 17.5
      - macOS 14.5
      - tvOS 17.5
      - visionOS 1.2
      - watchOS 10.5
  Android SDK: Not Found
IDEs:
  Android Studio: 2024.1 AI-241.18034.62.2412.12266719
  Xcode:
    version: 15.4/15F31d
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.75.1
    wanted: 0.75.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: false
Stacktrace or Logs
empty
Reproducer

https://github.com/ShaoGongBra/rn-test

Screenshots and Videos

No response

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  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。

调研方向

从链接的 rn-test 复现程序和 issue 中的示例 App 组件开始,在 Android 和 iOS 上使用启用 Fabric 的 React Native 0.75.2。使用带 padding 的 parent 复现百分比尺寸行为,然后跟踪 Fabric 布局路径,以确定 child 的尺寸在哪里发生偏差。当绝对定位 child 的 100% 宽度和高度按预期与 parent 容器匹配时,即表示完成。

由索引模型根据 Issue 内容生成。

评估

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

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