组件主题规范化更新

AppBarTheme、BottomAppBarTheme 和 InputDecorationTheme 已重构，以符合 Flutter 的组件主题约定。已添加 AppBarThemeData、BottomAppBarThemeData 和 InputDecorationThemeData，用于定义组件视觉属性默认值的覆盖。Flutter 的发布版本将继续规范化此类组件主题，以在 Material 库中提供更一致的主题体验。

在 ThemeData 中

appBarTheme 属性的类型已从 AppBarTheme 更改为 AppBarThemeData。
bottomAppBarTheme 属性的类型已从 BottomAppBarTheme 更改为 BottomAppBarThemeData。
inputDecorationTheme 属性的类型已从 InputDecorationTheme 更改为 InputDecorationThemeData。

组件主题 xTheme.of() 方法和 Theme.of().xTheme 的返回类型也已更改为 xThemeData。

在 DatePickerThemeData 和 TimePickerThemeData 中，inputDecorationTheme 属性的类型已从 InputDecorationTheme 更改为 InputDecorationThemeData。

迁移前的代码

Dartfinal 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;

Dartfinal 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());

迁移后的代码

Dartfinal 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;

Dartfinal 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());

引入版本：3.33.0-1.0.pre
稳定版本：尚未发布

API 文档

组件主题规范化更新

概述

迁移指南

时间线

参考资料