flutter-theming

Migrate Flutter apps from Material 2 to Material 3 with automated component and theme updates. Updates and manages Flutter application styling by migrating legacy Material 2 implementations to Material 3, normalizing component themes, updating deprecated button classes, and adapting UI idioms for cross-platform consistency. Assumes a Flutter environment using Dart. Analyze Current Theme State Review the existing Flutter codebase to identify legacy Material 2 components, deprecated button classes ( FlatButton , RaisedButton , OutlineButton ), and outdated theme properties (e.g., accentColor , color in AppBarTheme ). STOP AND ASK THE USER: "What is the primary seed color for the new Material 3 ColorScheme, and which target platforms (iOS, Android, Windows, macOS, Linux, Web) should be prioritized for platform idioms?" Decision Logic: Component Migration When encountering legacy widgets, use the following decision tree to determine the replacement: Implement App-Wide Material 3 Theme Define the global ThemeData using ColorScheme.fromSeed . Ensure useMaterial3 is implicitly or explicitly true. Remove all references to deprecated accent properties ( accentColor , accentColorBrightness , accentTextTheme , accentIconTheme ). Normalize Component Themes Update all component theme definitions in ThemeData to use their *ThemeData equivalents.