Summary:
This pull request is to fix https://github.com/facebook/react-native/issues/30258.
After an investigation, I found out the scroll offset of the list seems to be calculated incorrectly due to a workaround in the source code.
Instead of fixing the `calculateOffsetForContentSize`, I chose to remove it, the reason why I do so is because this workaround is for fixing the offset when `contentSize` is set manually, but according to the source code, there is no interface for a react-native user to set the `contentSize` of ScrollView, it is just set to `GCSizeZero` and will never be changed ([ref](https://github.com/facebook/react-native/pull/30647/files#diff-cf6f991f585ebf4cfdd555fe474e1f9ce40c2e4f823fc3f42b549414639c8c30L304)).
Also I changed the function name from `updateContentOffsetIfNeeded` to `updateContentSizeIfNeeded` according what the function is actually doing.
## Changelog
<!-- Help reviewers and the release process by writing your own changelog entry. For an example, see:
https://github.com/facebook/react-native/wiki/Changelog
-->
[iOS] [Fixed] - Incorrect ScrollView offset on update
Pull Request resolved: https://github.com/facebook/react-native/pull/30647
Test Plan:
1. Create a fresh new project named `testapp` using npx create-react-native-app
2. Apply example code to `testapp` from https://snack.expo.io/lokomass/flatlist
3. Run `testapp` on iOS emulator and reproduce the bug
4. Make changes to files in `testapp/node_modules/react-native/`
5. Rebuild `testapp` and run on iOS emulator again, the bug is no more exist
6. Apply changes from step 4 to react-native, make a pull request.
#### Screenshots
Before: The scroll offset is incorrect after children of FlatList has changed
https://user-images.githubusercontent.com/48589760/103155130-b54a0580-47d7-11eb-97af-bdfd3e728714.mov
After: No more incorrect scroll offset if children of FlatList has changed
https://user-images.githubusercontent.com/48589760/103155091-6ef4a680-47d7-11eb-89fa-6f708bfef1c9.mov
Reviewed By: sammy-SC
Differential Revision: D25732958
Pulled By: shergin
fbshipit-source-id: dac6eff15ac3bbfec502452ac14b3d49fee76c29
Summary: This change drops the year from the copyright headers and the LICENSE file.
Reviewed By: yungsters
Differential Revision: D9727774
fbshipit-source-id: df4fc1e4390733fe774b1a160dd41b4a3d83302a
Summary:
Includes React Native and its dependencies Fresco, Metro, and Yoga. Excludes samples/examples/docs.
find: ^(?:( *)|( *(?:[\*~#]|::))( )? *)?Copyright (?:\(c\) )?(\d{4})\b.+Facebook[\s\S]+?BSD[\s\S]+?(?:this source tree|the same directory)\.$
replace: $1$2$3Copyright (c) $4-present, Facebook, Inc.\n$2\n$1$2$3This source code is licensed under the MIT license found in the\n$1$2$3LICENSE file in the root directory of this source tree.
Reviewed By: TheSavior, yungsters
Differential Revision: D7007050
fbshipit-source-id: 37dd6bf0ffec0923bfc99c260bb330683f35553e
Mike
Valentin Shergin
Andres Suarez
Héctor Ramos
Sophie Alpert