react / react/react-native

React Native ScrollView Empty Space (flexGrow behaviour)

Aperta
#43,138 3 commenti 0 reazioni 0 assegnatari Vedi su GitHub

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Component: ScrollView Issue: Author Provided Repro Newer Patch Available
Lingua principale
C++
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Descrizione

Description

Please refer to attached images for context.

The issue is that the ScrollView component has added extra spacing at the bottom which is coloured red; this should not be there. The expected behaviour is that the green area is directly below the ScrollView content (blue); the red should never exist.

The blue area is not scollable when there is enough room and should become scrollable when there's not enough room.

Images 2 and 3 are the expected behaviour.

Steps to reproduce
  1. Run the attached expo snack and run on an Android device
  2. See how there is red, this should not be there and the green should be directly below the blue
  3. Change Array(5) to something larger like 15; blue expands until green has hit the bottom. Blue now becomes scrollable; this is expected.
  4. The ScrollView has the style red to illustrate that the ScrollView is filling the space regardless of it's content.`
React Native Version

0.72.4

Affected Platforms

Runtime - Android

Output of npx react-native info
System:
  OS: Linux 5.15 Ubuntu 20.04.6 LTS (Focal Fossa)
  CPU: (16) x64 11th Gen Intel(R) Core(TM) i9-11950H @ 2.60GHz
  Memory: 33.04 GB / 62.00 GB
  Shell:
    version: 5.0.17
    path: /bin/bash
Binaries:
  Node:
    version: 21.4.0
    path: /home/linuxbrew/.linuxbrew/bin/node
  Yarn:
    version: 1.22.19
    path: ~/.nvm/versions/node/v18.14.0/bin/yarn
  npm:
    version: 10.2.4
    path: /home/linuxbrew/.linuxbrew/bin/npm
  Watchman:
    version: 20230430.125247.0
    path: /usr/local/bin/watchman
SDKs:
  Android SDK: Not Found
IDEs:
  Android Studio: Not Found
Languages:
  Java:
    version: 11.0.21
    path: /usr/bin/javac
  Ruby:
    version: 2.7.0
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.72.10
    wanted: 0.72.10
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: false
  newArchEnabled: false
iOS:
  hermesEnabled: false
  newArchEnabled: Not found
Stacktrace or Logs
NA.
Reproducer

https://snack.expo.dev/@c-gibson-emesent/honest-red-scones

Screenshots and Videos

Image 1: Current behaviour when ScrollView is not scrollable
image1

Image 2: Expected look / behaviour when the ScrollView is not scrollable
image2

Image 3: How it should look when the items expand the ScrollView until there's no more room and the ScrollView becomes scrollable
image3

Guida per i contributori

Apri la guida per i contributori

Come iniziare

  1. Leggi tutta la issue e poi la guida ai contributi del progetto.
  2. Commenta sulla issue per dire che te ne occupi tu — evita che due persone facciano lo stesso lavoro.
  3. Fai un fork del repository e lavora su un branch.
  4. Apri una pull request che faccia riferimento al numero della issue.

Direzione di ricerca

Inizia eseguendo l’Expo Snack collegato su un dispositivo Android e confronta il comportamento di ScrollView con Array(5) e Array(15). Traccia il comportamento di ScrollView e flexGrow in React Native 0.72 responsabile dello spazio vuoto rosso. Il lavoro è completato quando il contenuto breve termina direttamente sopra l’area verde, mentre il contenuto più lungo si espande fino al limite e poi scorre.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Valutazione

Stack tecnologico
react-native
Ambito
mobile
Tipo di issue
Bug
Difficoltà
4/5
Tempo stimato
3-5 giorni
Stato di attività
Ferma
Chiarezza
Abbastanza chiara
Idoneità per principianti
38/100

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