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Component theme normalization updates

Summary

#

AppBarTheme, BottomAppBarTheme and InputDecorationTheme were refactored to conform to Flutter's conventions for component themes. AppBarThemeData, BottomAppBarThemeData and InputDecorationThemeData were added to define overrides for the defaults of the component visual properties. Releases of Flutter continue to normalize component themes like these for a more consistent theming experience in the material library.

Migration guide

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In ThemeData:

  • The type of the appBarTheme property has been changed from AppBarTheme to AppBarThemeData.
  • The type of bottomAppBarTheme property has been changed from BottomAppBarTheme to BottomAppBarThemeData.
  • The type of inputDecorationTheme property has been changed from InputDecorationTheme to InputDecorationThemeData.

The return type of the component theme xTheme.of() methods and Theme.of().xTheme have also changed to xThemeData.

In DatePickerThemeData and TimePickerThemeData, the type of the inputDecorationTheme property has been changed from InputDecorationTheme to InputDecorationThemeData.

Code before migration:

dart 
final AppBarTheme appBarTheme = Theme.of(context).appBarTheme;
final AppBarTheme appBarTheme = AppBarTheme.of(context);
​
final BottomAppBarTheme bottomAppBarTheme = Theme.of(context).bottomAppBarTheme;
final BottomAppBarTheme bottomAppBarTheme = BottomAppBarTheme.of(context);
​
final InputDecorationTheme inputDecorationTheme = Theme.of(context).inputDecorationTheme;
final InputDecorationTheme inputDecorationTheme = InputDecorationTheme.of(context);
final InputDecorationTheme inputDecorationTheme = Theme.of(context).datePickerTheme.inputDecorationTheme;
final InputDecorationTheme inputDecorationTheme = Theme.of(context).timePickerTheme.inputDecorationTheme;
dart 
final ThemeData theme = ThemeData(
  appBarTheme: AppBarTheme(),
  bottomAppBarTheme: BottomAppBarTheme(),
  inputDecorationTheme: InputDecorationTheme(),
);
​
final ThemeData theme = ThemeData().copyWith(
  appBarTheme: AppBarTheme(),
  bottomAppBarTheme: BottomAppBarTheme(),
  inputDecorationTheme: InputDecorationTheme(),
);
​
const DatePickerThemeData datePickerTheme = DatePickerThemeData(inputDecorationTheme: InputDecorationTheme());
const TimePickerThemeData timePickerTheme = TimePickerThemeData(inputDecorationTheme: InputDecorationTheme());

Code after migration:

dart 
final AppBarThemeData appBarTheme = Theme.of(context).appBarTheme;
final AppBarThemeData appBarTheme = AppBarTheme.of(context);
​
final BottomAppBarThemeData bottomAppBarTheme = Theme.of(context).bottomAppBarTheme;
final BottomAppBarThemeData bottomAppBarTheme = BottomAppBarTheme.of(context);
​
final InputDecorationThemeData inputDecorationTheme = Theme.of(context).inputDecorationTheme;
final InputDecorationThemeData inputDecorationTheme = InputDecorationTheme.of(context);
final InputDecorationThemeData inputDecorationTheme = Theme.of(context).datePickerTheme.inputDecorationTheme;
final InputDecorationThemeData inputDecorationTheme = Theme.of(context).timePickerTheme.inputDecorationTheme;
dart 
final ThemeData theme = ThemeData(
  appBarTheme: AppBarThemeData(),
  bottomAppBarTheme: BottomAppBarThemeData(),
  inputDecorationTheme: InputDecorationThemeData(),
);
​
final ThemeData theme = ThemeData().copyWith(
  appBarTheme: AppBarThemeData(),
  bottomAppBarTheme: BottomAppBarThemeData(),
  inputDecorationTheme: InputDecorationThemeData(),
);
​
const DatePickerThemeData datePickerTheme = DatePickerThemeData(inputDecorationTheme: InputDecorationThemeData());
const TimePickerThemeData timePickerTheme = TimePickerThemeData(inputDecorationTheme: InputDecorationThemeData());

Timeline

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Landed in version: 3.33.0-1.0.pre through 3.35.0-0.0.pre
Stable release: 3.35

References

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API documentation:

Relevant PRs:

Unless stated otherwise, the documentation on this site reflects Flutter 3.35.5. Page last updated on 2025-10-30. View source or report an issue.