List of my favorite extension methods in Flutter.

flutter_extension_methods.dart

import 'package:flutter/material.dart';

extension BuildContextExtensions on BuildContext {
  ThemeData get theme => Theme.of(this);

  TextTheme get textTheme => theme.textTheme;

  ColorScheme get colorScheme => theme.colorScheme;

  DefaultTextStyle get defaultTextStyle => DefaultTextStyle.of(this);

  MediaQueryData get mediaQuery => MediaQuery.of(this);

  NavigatorState get navigator => Navigator.of(this);

  FocusScopeNode get focusScope => FocusScope.of(this);

  ScaffoldState get scaffold => Scaffold.of(this);

  ScaffoldMessengerState get scaffoldMessenger => ScaffoldMessenger.of(this);
}

extension MaterialStateHelpers on Iterable<MaterialState> {
  bool get isHovered => contains(MaterialState.hovered);
  bool get isFocused => contains(MaterialState.focused);
  bool get isPressed => contains(MaterialState.pressed);
  bool get isDragged => contains(MaterialState.dragged);
  bool get isSelected => contains(MaterialState.selected);
  bool get isScrolledUnder => contains(MaterialState.scrolledUnder);
  bool get isDisabled => contains(MaterialState.disabled);
  bool get isError => contains(MaterialState.error);
}

extension IterableExtensions on Iterable {
  bool containsAny(Iterable<Object?> other) => other.any((e) => contains(e));
}