Workaround for flutter 3.22.0 colorscheme issue

[realth000]

I'm using the latest version of flex_color_scheme (7.3.1).

After upgrade to Flutter 3.22.0, some background part in widgets (such as Card) become brighter (not that much primary color as before).

Maybe flutter/issue148359 is related?

It appears when only setting scheme:

final colorScheme = FlexThemeData.light(
  scheme: FlexScheme.bahamaBlue,
);

Disappears when I override color roles in FlexThemeDta.light():

final seedScheme = ColorScheme.fromSeed(seedColor: seedColor);
final fixedColorScheme = FlexThemeData.light(
  primary: seedScheme?.primary,
  onPrimary: seedScheme?.onPrimary,
  primaryContainer: seedScheme?.primaryContainer,
  onPrimaryContainer: seedScheme?.onPrimaryContainer,
  // other color roles.
);

I don't know how to change it back, maybe specify CardTheme? But where I define the colorscheme is outside of BuildContext, const color value can not work with all primary colors.

Is there any workaround to fix background color when only using scheme?

[rydmike]

FlexColorScheme 7.3.1 and earlier version is not fully compatible with Flutter 3.22, since Flutter 3.22 contains many breaking changes in how it treats and handles surface colors.

FlexColorScheme 8.0.0, that will also contain breaking changes in order to adjust for all the breaking changes in Flutter 3.22 will resolve these breaking style changes in the manner intended by Flutter and Material design, but they will still not be identical to the styles prior to Flutter 3.22.

Yes, the less colored surface colors on e.g. elevated Card are a part of breaking style changes in Material-3 design. But some style changes you observe on some surfaces, if using FCS 7.3.1 or earlier with Flutter 3.22, may also be due to different usage of surface color mappings between the style breaking Flutter version 3.22 and FCS 7.3.1.

https://docs.flexcolorscheme.com/

[realth000]

Thanks! I will wait for 8.0.0 version no matter how long it will take, thanks for this great package.

[rydmike]

I will publish dev releases 8.0.0-dev.1 (...n) first when all the basics are OK, but it won't have its companion Themes Playground ready during dev releases of the package. I won't call it a stable 8.0.0 until Themes Playground is also updated to support Flutter 3.22. The bulk of the work is in updated Playground support and all the test in FCS as it aims for 100% coverage. The dev releases will skimp on some new tests too, to get something usable out faster for those that want to live on the edge.

[rydmike]

Some more info

Flutter 3.22 broke +100 tests and had +2000 deprecation warnings/hints in FlexColorScheme package and Themes Playground together. It will all be sorted, but the breakage is substantial and it will take some time before a compatible version that lives up to past high quality can be released. Plus I will be traveling the next few days, so that will slow down progress a bit :(

You can follow progress in my version 8.0.0 change log. I update it as I work on the 1st dev release of 8.0.0:

• https://github.com/rydmike/flex_color_scheme/blob/version-8-0-0/CHANGELOG.md

[realth000]

Have a good time

Maybe we can have more pre-defined color schemes about different travelling places in future version (far away from this discussion)