react / react/react-native

Android TextInput placeholder with custom font has incorrect height

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Component: TextInput Issue: Author Provided Repro
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描述

Description

TextInput placeholders that do not use the default android font and differ in their wrap point from the default font may be cut off. For example, if the default font does not wrap, and the custom font is slightly wider and does wrap to the next line, the placeholder will NOT reflect this wrapping, and the TextInput will only be one line.

React Native version:

System:
    OS: macOS 11.2.3
    CPU: (8) x64 Intel(R) Core(TM) i7-1068NG7 CPU @ 2.30GHz
    Memory: 91.84 MB / 32.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.0.0 - /usr/local/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 7.10.0 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.10.1 - /usr/local/bin/pod
  SDKs:
    iOS SDK:
      Platforms: iOS 14.4, DriverKit 20.2, macOS 11.1, tvOS 14.3, watchOS 7.2
    Android SDK:
      API Levels: 28, 29, 30
      Build Tools: 28.0.3, 29.0.2, 30.0.3, 31.0.0
      System Images: android-30 | Google APIs Intel x86 Atom
      Android NDK: Not Found
  IDEs:
    Android Studio: 4.1 AI-201.8743.12.41.6953283
    Xcode: 12.4/12D4e - /usr/bin/xcodebuild
  Languages:
    Java: 11.0.10 - /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home/bin/javac
  npmPackages:
    @react-native-community/cli: Not Found
    react: 17.0.1 => 17.0.1 
    react-native: 0.64.1 => 0.64.1 
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Steps To Reproduce

  • Create text input with placeholder string that does not wrap with default font, but does wrap with custom font.
  • Second line will not be visible.

Expected Results

Placeholder should adjust height according to its font.

Snack, code example, screenshot, or link to a repository:

https://snack.expo.io/@computerjazz/textinput-android-bug

expected behavior (in this case placeholder text is long enough that it ALSO would wrap using default font)
Screen Shot 2021-05-18 at 9 27 19

actual behavior (placeholder text using "serif" font wraps to a 3rd line, but if it were to use the default font it would not wrap, and as a result placeholder gets cut off):
Screen Shot 2021-05-18 at 9 22 40

For reference, here's the same text using default font, note that it does not wrap to a 3rd line:
Screen Shot 2021-05-18 at 9 30 30

贡献指南

打开贡献指南

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。

调研方向

使用自定义衬线字体和一个与默认字体换行方式不同的占位符,通过链接的 Snack 重现换行差异。然后跟踪负责占位符尺寸计算的 Android React Native TextInput 实现,并验证占位符高度包含所有换行后的行。

由索引模型根据 Issue 内容生成。

评估

技术栈
android, 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
38/100

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