Summary:
Original commit changeset: c45409a8413e
I was unable to find the cause of the problem.
Reviewed By: yungsters
Differential Revision: D16240754
fbshipit-source-id: c1e3f0aa615422f1156706f919e8f851f82c18b0
Summary:
The current technique we use to draw text uses linear memory, which means that when text is too long the UIView layer is unable to draw it. This causes the issue described [here](https://github.com/facebook/react-native/issues/19453). On an iOS simulator the bug happens at around 500 lines which is quite annoying. It can also happen on a real device but requires a lot more text.
To be more specific the amount of text doesn't actually matter, it is the size of the UIView that we use to draw the text. When we use `[drawRect:]` the view creates a bitmap to send to the gpu to render, if that bitmap is too big it cannot render.
To fix this we can use `CATiledLayer` which will split drawing into smaller parts, that gets executed when the content is about to be visible. This drawing is also async which means the text can seem to appear during scroll. See https://developer.apple.com/documentation/quartzcore/calayer?language=objc.
`CATiledLayer` also adds some overhead that we don't want when rendering small amount of text. To fix this we can use either a regular `CALayer` or a `CATiledLayer` depending on the size of the view containing the text. I picked 1024 as the threshold which is about 1 screen and a half, and is still smaller than the height needed for the bug to occur when using a regular `CALayer` on a iOS simulator.
Also found this which addresses the problem in a similar manner and took some inspiration from the code linked there https://github.com/GitHawkApp/StyledTextKit/issues/14#issuecomment-395234885
Fixes https://github.com/facebook/react-native/issues/19453
## Changelog
[iOS] [Fixed] - Use CALayers to draw text, fixes rendering for long text
Pull Request resolved: https://github.com/facebook/react-native/pull/24387
Test Plan:
- Added the example I was using to verify the fix to RNTester.
- Made sure all other examples are still rendering properly.
- Tested text selection
Reviewed By: shergin
Differential Revision: D15918277
Pulled By: sammy-SC
fbshipit-source-id: c45409a8413e6e3ad272be39ba527a4e8d349e28
Summary:
I found that on Android we only support 2 fontWeight options, either **normal** or **bold**, even developer can set any numeric value. But iOS supports all possible numeric values. This PR tries to add support for all possible numeric values on Android, even if it's supported only on Android P(28) and above.
This change might break texts where fontWeight use improperly, because this PR removes conversion of values above 500 to BOLD and below 500 to normal.
FYI, also moved **mCustomTypefaceCache** usage up because it was working after unnecessary mFontCache usage.
## Changelog
[Android] [Changed] - add custom font weight support to Text component on Android, only on P(API 28) and above versions.
Pull Request resolved: https://github.com/facebook/react-native/pull/25341
Test Plan: RNTester app's Text examples will show Rubik Regular, Rubik Light, Rubik Bold, Rubik Medium and Rubik Medium Italic texts in corresponding font family, style and weights.
Differential Revision: D15956350
Pulled By: mdvacca
fbshipit-source-id: 61079d953c65fb34ab4497d44c22317912a5a616
Summary:
Changes RNTester, first attempt in the direction of improving the RNTester overall. Related ticket: #24647
Changed the `js` directory of the RNTester to have the following structure:
```
- js
- assets
- components
- examples
- types
- utils
```
* **assets**
_Any images, gifs, and media content_
* **components**
_All shared components_
* **examples**
_Example View/Components to be rendered by the App_
* **types**
_Shared flow types_
* **utils**
_Shared utilities_
## Changelog
[General] [Changed] - Update folder structure of RNTester's JS directory.
Pull Request resolved: https://github.com/facebook/react-native/pull/25013
Differential Revision: D15515773
Pulled By: cpojer
fbshipit-source-id: 0e4b6386127f338dca0ffe8c237073be53a9e221
Logan Daniels
Samuel Susla
Janic Duplessis
Dulmandakh
AndreiCalazans