[android] [ios] [web] `measure` returns incorrect values of `View` if its parent `View` is `scale`d using `transform` style
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描述
Description
If use measure method to calculate x, y, width, height, pageX, pageY values of View it will return incorrect values in case if parent View has styles:
transform: [
{
scale: 2,
},
],
in this case width, height, pageX, pageY values from measure callback will be doubled compared to real ones.
Specs
- It is wrong due docs as
transformstyle prop doesnt change layout,transformis used to change appearance only:Transforms are style properties that will help you modify the appearance and position of your components using 2D or 3D transformations. However, once you apply transforms, the layouts remain the same around the transformed component
- It is inconsistent with
react-native-webwheretransformdoesnt affectwidth, height, pageX, pageYvalues - It is inconsistent with response of
onLayoutcallback which will returnwidth, heightNOT scaled
Problem
There are 3 different behaviors:
react-native-webreturns real sizesonLayoutreturns real sizesmeasurereturns size SCALED due to its parenttransformstyle
Steps to reproduce
See example
React Native Version
0.81.5
Affected Platforms
Runtime - Android,
Runtime - iOS,
Runtime - Web
Output of npx @react-native-community/cli info
See example
Stacktrace or Logs
See example console logs on Android (or iOS)
MANDATORY Reproducer
https://snack.expo.dev/@sepu/rn-measure-bug-w-transform
Screenshots and Videos
web console logs (3rd and 4th parameters are the same) which is ok:
>>>>> useLayoutEffect measure x, y, width, height, pageX, pageY 134 351 71 39 134 351
onLayoutHandler layout.x, layout.y, layout.width, layout.height 134 351 71 39
Android / iOS console logs (3rd and 4th parameters for measure are 2x bigger than from onLayout):
>>>>> useLayoutEffect measure x, y, width, height, pageX, pageY 176 456 148 78 139 437
onLayoutHandler layout.x, layout.y, layout.width, layout.height 176 456 74 39
贡献指南
从这里开始
- 先读完整个 Issue,再读项目的贡献指南。
- 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
- Fork 仓库,在一个分支上完成修改。
- 提交 Pull Request,并在描述里引用这个 Issue 编号。
调研方向
从必需的 Snack reproducer 开始,在 Android、iOS 和 web 上比较 measure 与 onLayout。追踪 reproducer 所展示的平台特定测量行为;完成的标准是 measure 报告的值与未缩放的布局以及现有的 web 和 onLayout 结果一致。
由索引模型根据 Issue 内容生成。
评估
- 技术栈
- javascript, react-native
- 领域
- mobile-dev
- Issue 类型
- 缺陷
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 活跃度
- 冷清
- 描述清晰度
- 基本清楚
- 新手友好度
- 50/100