Huy 494b08b420
Normalize BottomAppBarTheme (#168586)
This PR is to make `BottomAppBarTheme` conform to Flutter Material's
conventions for component themes:

- Added a `BottomAppBarThemeData` class which defines overrides for the
defaults for `BottomAppBar` properties.
- Added `BottomAppBarTheme` constructor parameters:
`BottomAppBarThemeData? data` and `Widget? child`. This is now the
preferred way to configure a `BottomAppBarTheme`:

```dart
BottomAppBarTheme(
	data: BottomAppBarThemeData(
	    color: xxx,
	    height: xxx,
	    elevation: xxx,
	    shape: xxx,
	    ...
	  ),
  	child: const BottomAppBar()
)
```
These two properties are made nullable to not break existing apps which
has customized `ThemeData.bottomAppBarTheme`.

- Update `BottomAppBarTheme` to be an `InheritedWidget` subclass.
- Changed the type of component theme defaults from `BottomAppBarTheme`
to `BottomAppBarThemeData`.
- Changed the `BottomAppBarTheme bottomAppBarTheme` property to
`BottomAppBarThemeData bottomAppBarTheme` in `ThemeData` and
`ThemeData.copyWith()`. This may cause breaking changes, a migration
guide will be created on website repo.
- Add new tests for `BottomAppBarThemeData` and update the existing
`BottomAppBarTheme` tests. And also turn to `true` for `useMaterial3`
(along with usages accordingly) at the common method `_withTheme()`
since `useMaterial3` is true by default.
- Addresses the "theme normalization" sub-project within #91772.

## Pre-launch Checklist

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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.
- [x] 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.

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---------

Signed-off-by: huycozy <huy@nevercode.io>
2025-05-14 17:38:18 +00:00
..
2025-05-08 00:50:25 +00:00
2025-05-08 00:50:25 +00:00
2025-05-08 00:50:25 +00:00
2025-05-08 00:50:25 +00:00

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