zIndex in a List

[TheNoim]

• I have reviewed the documentation
• I have searched existing issues
• I am using the latest React Native version

This is actually a reopen of my #16878 issue. I've got some thumbs up, so I think I am not the only one with this issue. This time I updated my example project to a pure rn project with the latest release (rn Branche)

Environment

info
  React Native Environment Info:
    System:
      OS: macOS High Sierra 10.13.6
      CPU: (8) x64 Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
      Memory: 94.53 MB / 16.00 GB
      Shell: 5.3 - /bin/zsh
    Binaries:
      Node: 10.12.0 - ~/.nvm/versions/node/v10.12.0/bin/node
      Yarn: 1.16.0 - ~/.nvm/versions/node/v10.12.0/bin/yarn
      npm: 6.9.0 - /usr/local/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    SDKs:
      iOS SDK:
        Platforms: iOS 12.1, macOS 10.14, tvOS 12.1, watchOS 5.1
      Android SDK:
        API Levels: 23
        Build Tools: 23.0.1
    IDEs:
      Xcode: 10.1/10B61 - /usr/bin/xcodebuild
    npmPackages:
      react: 16.8.3 => 16.8.3
      react-native: 0.59.8 => 0.59.8
    npmGlobalPackages:
      react-native-cli: 2.0.1
      react-native-git-upgrade: 0.2.7

Steps to Reproduce

1. Make a list (FlatList or Array.map, it happens with both)
2. The renderItem should get an onPress event
3. The onPress event changes the style to a high zIndex and position absolute

Expected Behavior

I expect that the component with the high zIndex is over every other component.

Actual Behavior

It seems like it ignores the zIndex property. The behavior is exactly like I would not apply any zIndex. I can remove the zIndex and I get the same result.
Google Drive Link to a screenshot.

Reproducible Demo

Github Demo Project rn Branche This is just an extract out of my current rn project.
Expo Link (Not on the latest rn version)
Google Drive Video which show the issue

[mattmcdev]

I was about to open a proposal on this, but might be better to just discuss in this issue.

I came across the same problem and worked around it by adding an additional cellStyle prop to my FlatList component. I then added this cellStyle prop to the styles array generated by CellRenderer in VirtualizedList.

Setting the zIndex to the parent element generated by CellRenderer works as you'd expect.

Happy to put in a PR if this seems like an acceptable solution.

@TheNoim For the time being you could use patch-package to make the same change in this commit: https://github.com/mattmcdonald-uk/react-native/commit/a59888b9b68698985b784b6ee29a80c9b878e28d

[TheNoim]

@mattmcdonald-uk Thanks for the solution, but I can't use it. I tried to modify your attempt (mattmcdonald-uk/react-native@a59888b). In my example repo I use a wrapper component which can't have the cellStyle prop and I tried to access the applied style with other methods, but I failed. It is a workaround but not a final solution. This should really get fixed.

Off topic: react-native-bot 1, @hramos 0 :D Just kidding.

[ethanyuwang]

Having the same issue here

[TheNoim]

Will we ever get a fix for this? I mean, this is the second issue about this and still: nothing