yim
972c181212
Allow the Slider to always show the value indicator. (#162223)
Fixes: #34704
Modified enum `ShowValueIndicator`
before:
```dart
enum ShowValueIndicator {
onlyForDiscrete,
onlyForContinuous,
always,
never,
}
```
after:
```dart
enum ShowValueIndicator {
onlyForDiscrete,
onlyForContinuous,
@Deprecated(
'Use ShowValueIndicator.onDrag. '
'This feature was deprecated after v3.28.0-1.0.pre.',
)
always,
onDrag,
alwaysVisible,
never,
}
```
To maintain previous behavior, `ShowValueIndicator.onlyForDiscrete` and
`ShowValueIndicator.onlyForContinuous` are still retained.
The behavior of `ShowValueIndicator.always` remains consistent with the
previous implementation, but it is marked as deprecated and should be
replaced with `ShowValueIndicator.onDrag`. A new
`ShowValueIndicator.alwaysVisible` has been added to show the value
indicator even when not dragging.
Additionally, the value indicator is now rendered by `OverlayPortal`.
*If you had to change anything in the [flutter/tests] repo, include a
link to the migration guide as per the [breaking change policy].*
## Pre-launch Checklist
- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
If you need help, consider asking for advice on the #hackers-new channel
on [Discord].
<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
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