// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:ui' show Color, lerpDouble;

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';

import 'app_bar_theme.dart';
import 'banner_theme.dart';
import 'bottom_app_bar_theme.dart';
import 'bottom_navigation_bar_theme.dart';
import 'bottom_sheet_theme.dart';
import 'button_bar_theme.dart';
import 'button_theme.dart';
import 'card_theme.dart';
import 'checkbox_theme.dart';
import 'chip_theme.dart';
import 'color_scheme.dart';
import 'colors.dart';
import 'data_table_theme.dart';
import 'dialog_theme.dart';
import 'divider_theme.dart';
import 'drawer_theme.dart';
import 'elevated_button_theme.dart';
import 'expansion_tile_theme.dart';
import 'floating_action_button_theme.dart';
import 'ink_sparkle.dart';
import 'ink_splash.dart';
import 'ink_well.dart' show InteractiveInkFeatureFactory;
import 'input_decorator.dart';
import 'list_tile.dart';
import 'list_tile_theme.dart';
import 'navigation_bar_theme.dart';
import 'navigation_rail_theme.dart';
import 'outlined_button_theme.dart';
import 'page_transitions_theme.dart';
import 'popup_menu_theme.dart';
import 'progress_indicator_theme.dart';
import 'radio_theme.dart';
import 'scrollbar_theme.dart';
import 'slider_theme.dart';
import 'snack_bar_theme.dart';
import 'switch_theme.dart';
import 'tab_bar_theme.dart';
import 'text_button_theme.dart';
import 'text_selection_theme.dart';
import 'text_theme.dart';
import 'time_picker_theme.dart';
import 'toggle_buttons_theme.dart';
import 'tooltip_theme.dart';
import 'typography.dart';

export 'package:flutter/services.dart' show Brightness;

/// An interface that defines custom additions to a [ThemeData] object.
///
/// Typically used for custom colors. To use, subclass [ThemeExtension],
/// define a number of fields (e.g. [Color]s), and implement the [copyWith] and
/// [lerp] methods. The latter will ensure smooth transitions of properties when
/// switching themes.
///
/// {@tool dartpad}
/// This sample shows how to create and use a subclass of [ThemeExtension] that
/// defines two colors.
///
/// ** See code in examples/api/lib/material/theme/theme_extension.1.dart **
/// {@end-tool}
abstract class ThemeExtension<T extends ThemeExtension<T>> {
  /// Enable const constructor for subclasses.
  const ThemeExtension();

  /// The extension's type.
  Object get type => T;

  /// Creates a copy of this theme extension with the given fields
  /// replaced by the non-null parameter values.
  ThemeExtension<T> copyWith();

  /// Linearly interpolate with another [ThemeExtension] object.
  ///
  /// {@macro dart.ui.shadow.lerp}
  ThemeExtension<T> lerp(ThemeExtension<T>? other, double t);
}

// Deriving these values is black magic. The spec claims that pressed buttons
// have a highlight of 0x66999999, but that's clearly wrong. The videos in the
// spec show that buttons have a composited highlight of #E1E1E1 on a background
// of #FAFAFA. Assuming that the highlight really has an opacity of 0x66, we can
// solve for the actual color of the highlight:
const Color _kLightThemeHighlightColor = Color(0x66BCBCBC);

// The same video shows the splash compositing to #D7D7D7 on a background of
// #E1E1E1. Again, assuming the splash has an opacity of 0x66, we can solve for
// the actual color of the splash:
const Color _kLightThemeSplashColor = Color(0x66C8C8C8);

// Unfortunately, a similar video isn't available for the dark theme, which
// means we assume the values in the spec are actually correct.
const Color _kDarkThemeHighlightColor = Color(0x40CCCCCC);
const Color _kDarkThemeSplashColor = Color(0x40CCCCCC);

/// Configures the tap target and layout size of certain Material widgets.
///
/// Changing the value in [ThemeData.materialTapTargetSize] will affect the
/// accessibility experience.
///
/// Some of the impacted widgets include:
///
///   * [FloatingActionButton], only the mini tap target size is increased.
///   * [MaterialButton]
///   * [OutlinedButton]
///   * [TextButton]
///   * [ElevatedButton]
///   * [FlatButton]
///   * [RaisedButton]
///   * The time picker widget ([showTimePicker])
///   * [SnackBar]
///   * [Chip]
///   * [RawChip]
///   * [InputChip]
///   * [ChoiceChip]
///   * [FilterChip]
///   * [ActionChip]
///   * [Radio]
///   * [Switch]
///   * [Checkbox]
enum MaterialTapTargetSize {
  /// Expands the minimum tap target size to 48px by 48px.
  ///
  /// This is the default value of [ThemeData.materialTapTargetSize] and the
  /// recommended size to conform to Android accessibility scanner
  /// recommendations.
  padded,

  /// Shrinks the tap target size to the minimum provided by the Material
  /// specification.
  shrinkWrap,
}

/// Defines the configuration of the overall visual [Theme] for a [MaterialApp]
/// or a widget subtree within the app.
///
/// The [MaterialApp] theme property can be used to configure the appearance
/// of the entire app. Widget subtree's within an app can override the app's
/// theme by including a [Theme] widget at the top of the subtree.
///
/// Widgets whose appearance should align with the overall theme can obtain the
/// current theme's configuration with [Theme.of]. Material components typically
/// depend exclusively on the [colorScheme] and [textTheme]. These properties
/// are guaranteed to have non-null values.
///
/// The static [Theme.of] method finds the [ThemeData] value specified for the
/// nearest [BuildContext] ancestor. This lookup is inexpensive, essentially
/// just a single HashMap access. It can sometimes be a little confusing
/// because [Theme.of] can not see a [Theme] widget that is defined in the
/// current build method's context. To overcome that, create a new custom widget
/// for the subtree that appears below the new [Theme], or insert a widget
/// that creates a new BuildContext, like [Builder].
///
/// {@tool snippet}
/// In this example, the [Container] widget uses [Theme.of] to retrieve the
/// primary color from the theme's [colorScheme] to draw an amber square.
/// The [Builder] widget separates the parent theme's [BuildContext] from the
/// child's [BuildContext].
///
/// ![](https://flutter.github.io/assets-for-api-docs/assets/material/theme_data.png)
///
/// ```dart
/// Theme(
///   data: ThemeData.from(
///     colorScheme: ColorScheme.fromSwatch(primarySwatch: Colors.amber),
///   ),
///   child: Builder(
///     builder: (BuildContext context) {
///       return Container(
///         width: 100,
///         height: 100,
///         color: Theme.of(context).colorScheme.primary,
///       );
///     },
///   ),
/// )
/// ```
/// {@end-tool}
///
/// {@tool snippet}
///
/// This sample creates a [MaterialApp] with a [Theme] whose
/// [ColorScheme] is based on [Colors.blue], but with the color
/// scheme's [ColorScheme.secondary] color overridden to be green. The
/// [AppBar] widget uses the color scheme's [ColorScheme.primary] as
/// its default background color and the [FloatingActionButton] widget
/// uses the color scheme's [ColorScheme.secondary] for its default
/// background. By default, the [Text] widget uses
/// [TextTheme.bodyText2], and the color of that [TextStyle] has been
/// changed to purple.
///
/// ![](https://flutter.github.io/assets-for-api-docs/assets/material/material_app_theme_data.png)
///
/// ```dart
/// MaterialApp(
///   theme: ThemeData(
///     colorScheme: ColorScheme.fromSwatch(
///       primarySwatch: Colors.blue,
///     ).copyWith(
///       secondary: Colors.green,
///     ),
///     textTheme: const TextTheme(bodyText2: TextStyle(color: Colors.purple)),
///   ),
///   home: Scaffold(
///     appBar: AppBar(
///       title: const Text('ThemeData Demo'),
///     ),
///     floatingActionButton: FloatingActionButton(
///       child: const Icon(Icons.add),
///       onPressed: () {},
///     ),
///     body: const Center(
///       child: Text('Button pressed 0 times'),
///     ),
///   ),
/// )
/// ```
/// {@end-tool}
///
/// See <https://material.io/design/color/> for
/// more discussion on how to pick the right colors.

@immutable
class ThemeData with Diagnosticable {
  /// Create a [ThemeData] that's used to configure a [Theme].
  ///
  /// The [colorScheme] and [textTheme] are used by the Material components to
  /// compute default values for visual properties. The API documentation for
  /// each component widget explains exactly how the defaults are computed.
  ///
  /// When providing a [ColorScheme], apps can either provide one directly
  /// with the [colorScheme] parameter, or have one generated for them by
  /// using the [colorSchemeSeed] and [brightness] parameters. A generated
  /// color scheme will be based on the tones of [colorSchemeSeed] and all of
  /// its contrasting color will meet accessibility guidelines for readability.
  /// (See [ColorScheme.fromSeed] for more details.)
  ///
  /// If the app wants to customize a generated color scheme, it can use
  /// [ColorScheme.fromSeed] directly and then [ColorScheme.copyWith] on the
  /// result to override any colors that need to be replaced. The result of
  /// this can be used as the [colorScheme] directly.
  ///
  /// For historical reasons, instead of using a [colorSchemeSeed] or
  /// [colorScheme], you can provide either a [primaryColor] or [primarySwatch]
  /// to construct the [colorScheme], but the results will not be as complete
  /// as when using generation from a seed color.
  ///
  /// If [colorSchemeSeed] is non-null then [colorScheme], [primaryColor] and
  /// [primarySwatch] must all be null.
  ///
  /// The [textTheme] [TextStyle] colors are black if the color scheme's
  /// brightness is [Brightness.light], and white for [Brightness.dark].
  ///
  /// To override the appearance of specific components, provide
  /// a component theme parameter like [sliderTheme], [toggleButtonsTheme],
  /// or [bottomNavigationBarTheme].
  ///
  /// See also:
  ///
  ///  * [ThemeData.from], which creates a ThemeData from a [ColorScheme].
  ///  * [ThemeData.light], which creates a light blue theme.
  ///  * [ThemeData.dark], which creates dark theme with a teal secondary [ColorScheme] color.
  ///  * [ColorScheme.fromSeed], which is used to create a [ColorScheme] from a seed color.
  factory ThemeData({
    // GENERAL CONFIGURATION
    bool? applyElevationOverlayColor,
    NoDefaultCupertinoThemeData? cupertinoOverrideTheme,
    Iterable<ThemeExtension<dynamic>>? extensions,
    InputDecorationTheme? inputDecorationTheme,
    MaterialTapTargetSize? materialTapTargetSize,
    PageTransitionsTheme? pageTransitionsTheme,
    TargetPlatform? platform,
    ScrollbarThemeData? scrollbarTheme,
    InteractiveInkFeatureFactory? splashFactory,
    VisualDensity? visualDensity,
    bool? useMaterial3,
    // COLOR
    // [colorScheme] is the preferred way to configure colors. The other color
    // properties (as well as primaryColorBrightness, and primarySwatch)
    // will gradually be phased out, see https://github.com/flutter/flutter/issues/91772.
    ColorScheme? colorScheme,
    Color? colorSchemeSeed,
    Brightness? brightness,
    MaterialColor? primarySwatch,
    Color? primaryColor,
    Color? primaryColorLight,
    Color? primaryColorDark,
    Color? focusColor,
    Color? hoverColor,
    Color? shadowColor,
    Color? canvasColor,
    Color? scaffoldBackgroundColor,
    Color? bottomAppBarColor,
    Color? cardColor,
    Color? dividerColor,
    Color? highlightColor,
    Color? splashColor,
    Color? selectedRowColor,
    Color? unselectedWidgetColor,
    Color? disabledColor,
    Color? secondaryHeaderColor,
    Color? backgroundColor,
    Color? dialogBackgroundColor,
    Color? indicatorColor,
    Color? hintColor,
    Color? errorColor,
    Color? toggleableActiveColor,
    // TYPOGRAPHY & ICONOGRAPHY
    String? fontFamily,
    Typography? typography,
    TextTheme? textTheme,
    TextTheme? primaryTextTheme,
    IconThemeData? iconTheme,
    IconThemeData? primaryIconTheme,
    // COMPONENT THEMES
    AppBarTheme? appBarTheme,
    MaterialBannerThemeData? bannerTheme,
    BottomAppBarTheme? bottomAppBarTheme,
    BottomNavigationBarThemeData? bottomNavigationBarTheme,
    BottomSheetThemeData? bottomSheetTheme,
    ButtonBarThemeData? buttonBarTheme,
    ButtonThemeData? buttonTheme,
    CardTheme? cardTheme,
    CheckboxThemeData? checkboxTheme,
    ChipThemeData? chipTheme,
    DataTableThemeData? dataTableTheme,
    DialogTheme? dialogTheme,
    DividerThemeData? dividerTheme,
    DrawerThemeData? drawerTheme,
    ElevatedButtonThemeData? elevatedButtonTheme,
    FloatingActionButtonThemeData? floatingActionButtonTheme,
    ListTileThemeData? listTileTheme,
    NavigationBarThemeData? navigationBarTheme,
    NavigationRailThemeData? navigationRailTheme,
    OutlinedButtonThemeData? outlinedButtonTheme,
    PopupMenuThemeData? popupMenuTheme,
    ProgressIndicatorThemeData? progressIndicatorTheme,
    RadioThemeData? radioTheme,
    SliderThemeData? sliderTheme,
    SnackBarThemeData? snackBarTheme,
    SwitchThemeData? switchTheme,
    TabBarTheme? tabBarTheme,
    TextButtonThemeData? textButtonTheme,
    TextSelectionThemeData? textSelectionTheme,
    TimePickerThemeData? timePickerTheme,
    ToggleButtonsThemeData? toggleButtonsTheme,
    TooltipThemeData? tooltipTheme,
    ExpansionTileThemeData? expansionTileTheme,
    // DEPRECATED (newest deprecations at the bottom)
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v1.23.0-4.0.pre.',
    )
    bool? useTextSelectionTheme,
    @Deprecated(
      'Use TextSelectionThemeData.selectionColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    Color? textSelectionColor,
    @Deprecated(
      'Use TextSelectionThemeData.cursorColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    Color? cursorColor,
    @Deprecated(
      'Use TextSelectionThemeData.selectionHandleColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    Color? textSelectionHandleColor,
    @Deprecated(
      'Use colorScheme.secondary instead. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    Color? accentColor,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    Brightness? accentColorBrightness,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    TextTheme? accentTextTheme,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    IconThemeData? accentIconTheme,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v2.3.0-0.2.pre.',
    )
    Color? buttonColor,
    @Deprecated(
      'This "fix" is now enabled by default. '
      'This feature was deprecated after v2.5.0-1.0.pre.',
    )
    bool? fixTextFieldOutlineLabel,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v2.6.0-11.0.pre.',
    )
    Brightness? primaryColorBrightness,
    @Deprecated(
      'Use ThemeData.useMaterial3 or override ScrollBehavior.buildOverscrollIndicator. '
      'This feature was deprecated after v2.13.0-0.0.pre.'
    )
    AndroidOverscrollIndicator? androidOverscrollIndicator,
  }) {
    // GENERAL CONFIGURATION
    cupertinoOverrideTheme = cupertinoOverrideTheme?.noDefault();
    extensions ??= <ThemeExtension<dynamic>>[];
    inputDecorationTheme ??= const InputDecorationTheme();
    platform ??= defaultTargetPlatform;
    switch (platform) {
      case TargetPlatform.android:
      case TargetPlatform.fuchsia:
      case TargetPlatform.iOS:
        materialTapTargetSize ??= MaterialTapTargetSize.padded;
        break;
      case TargetPlatform.linux:
      case TargetPlatform.macOS:
      case TargetPlatform.windows:
         materialTapTargetSize ??= MaterialTapTargetSize.shrinkWrap;
        break;
    }
    pageTransitionsTheme ??= const PageTransitionsTheme();
    scrollbarTheme ??= const ScrollbarThemeData();
    visualDensity ??= VisualDensity.adaptivePlatformDensity;
    useMaterial3 ??= false;
    final bool useInkSparkle = platform == TargetPlatform.android && !kIsWeb;
    splashFactory ??= (useMaterial3 && useInkSparkle) ? InkSparkle.splashFactory : InkSplash.splashFactory;

    // COLOR
    assert(colorScheme?.brightness == null || brightness == null || colorScheme!.brightness == brightness);
    assert(colorSchemeSeed == null || colorScheme == null);
    assert(colorSchemeSeed == null || primarySwatch == null);
    assert(colorSchemeSeed == null || primaryColor == null);
    final Brightness effectiveBrightness = brightness ?? colorScheme?.brightness ?? Brightness.light;
    final bool isDark = effectiveBrightness == Brightness.dark;
    if (colorSchemeSeed != null) {
      colorScheme = ColorScheme.fromSeed(seedColor: colorSchemeSeed, brightness: effectiveBrightness);

      // For surfaces that use primary color in light themes and surface color in dark
      final Color primarySurfaceColor = isDark ? colorScheme.surface : colorScheme.primary;
      final Color onPrimarySurfaceColor = isDark ? colorScheme.onSurface : colorScheme.onPrimary;

      // Default some of the color settings to values from the color scheme
      primaryColor = primarySurfaceColor;
      primaryColorBrightness = ThemeData.estimateBrightnessForColor(primarySurfaceColor);
      canvasColor ??= colorScheme.background;
      accentColor ??= colorScheme.secondary;
      accentColorBrightness ??= ThemeData.estimateBrightnessForColor(colorScheme.secondary);
      scaffoldBackgroundColor ??= colorScheme.background;
      bottomAppBarColor ??= colorScheme.surface;
      cardColor ??= colorScheme.surface;
      dividerColor ??= colorScheme.outline;
      backgroundColor ??= colorScheme.background;
      dialogBackgroundColor ??= colorScheme.background;
      indicatorColor ??= onPrimarySurfaceColor;
      errorColor ??= colorScheme.error;
      applyElevationOverlayColor ??= brightness == Brightness.dark;
    }
    applyElevationOverlayColor ??= false;
    primarySwatch ??= Colors.blue;
    primaryColor ??= isDark ? Colors.grey[900]! : primarySwatch;
    final Brightness estimatedPrimaryColorBrightness = estimateBrightnessForColor(primaryColor);
    primaryColorLight ??= isDark ? Colors.grey[500]! : primarySwatch[100]!;
    primaryColorDark ??= isDark ? Colors.black : primarySwatch[700]!;
    final bool primaryIsDark = estimatedPrimaryColorBrightness == Brightness.dark;
    toggleableActiveColor ??= isDark ? Colors.tealAccent[200]! : (accentColor ?? primarySwatch[600]!);
    accentColor ??= isDark ? Colors.tealAccent[200]! : primarySwatch[500]!;
    accentColorBrightness ??= estimateBrightnessForColor(accentColor);
    final bool accentIsDark = accentColorBrightness == Brightness.dark;
    focusColor ??= isDark ? Colors.white.withOpacity(0.12) : Colors.black.withOpacity(0.12);
    hoverColor ??= isDark ? Colors.white.withOpacity(0.04) : Colors.black.withOpacity(0.04);
    shadowColor ??= Colors.black;
    canvasColor ??= isDark ? Colors.grey[850]! : Colors.grey[50]!;
    scaffoldBackgroundColor ??= canvasColor;
    bottomAppBarColor ??= isDark ? Colors.grey[800]! : Colors.white;
    cardColor ??= isDark ? Colors.grey[800]! : Colors.white;
    dividerColor ??= isDark ? const Color(0x1FFFFFFF) : const Color(0x1F000000);
    // Create a ColorScheme that is backwards compatible as possible
    // with the existing default ThemeData color values.
    colorScheme ??= ColorScheme.fromSwatch(
      primarySwatch: primarySwatch,
      primaryColorDark: primaryColorDark,
      accentColor: accentColor,
      cardColor: cardColor,
      backgroundColor: backgroundColor,
      errorColor: errorColor,
      brightness: effectiveBrightness,
    );
    selectedRowColor ??= Colors.grey[100]!;
    unselectedWidgetColor ??= isDark ? Colors.white70 : Colors.black54;
    // Spec doesn't specify a dark theme secondaryHeaderColor, this is a guess.
    secondaryHeaderColor ??= isDark ? Colors.grey[700]! : primarySwatch[50]!;
    backgroundColor ??= isDark ? Colors.grey[700]! : primarySwatch[200]!;
    dialogBackgroundColor ??= isDark ? Colors.grey[800]! : Colors.white;
    indicatorColor ??= accentColor == primaryColor ? Colors.white : accentColor;
    hintColor ??= isDark ? Colors.white60 : Colors.black.withOpacity(0.6);
    errorColor ??= Colors.red[700]!;
    // The default [buttonTheme] is here because it doesn't use the defaults for
    // [disabledColor], [highlightColor], and [splashColor].
    buttonTheme ??= ButtonThemeData(
      colorScheme: colorScheme,
      // Defaults to the fill color for RaisedButtons for backwards compatibility.
      buttonColor: buttonColor ?? (isDark ? primarySwatch[600]! : Colors.grey[300]!),
      disabledColor: disabledColor,
      focusColor: focusColor,
      hoverColor: hoverColor,
      highlightColor: highlightColor,
      splashColor: splashColor,
      materialTapTargetSize: materialTapTargetSize,
    );
    disabledColor ??= isDark ? Colors.white38 : Colors.black38;
    highlightColor ??= isDark ? _kDarkThemeHighlightColor : _kLightThemeHighlightColor;
    splashColor ??= isDark ? _kDarkThemeSplashColor : _kLightThemeSplashColor;

    // TYPOGRAPHY & ICONOGRAPHY
    typography ??= useMaterial3 ? Typography.material2021(platform: platform) : Typography.material2014(platform: platform);
    TextTheme defaultTextTheme = isDark ? typography.white : typography.black;
    TextTheme defaultPrimaryTextTheme = primaryIsDark ? typography.white : typography.black;
    TextTheme defaultAccentTextTheme = accentIsDark ? typography.white : typography.black;
    if (fontFamily != null) {
      defaultTextTheme = defaultTextTheme.apply(fontFamily: fontFamily);
      defaultPrimaryTextTheme = defaultPrimaryTextTheme.apply(fontFamily: fontFamily);
      defaultAccentTextTheme = defaultAccentTextTheme.apply(fontFamily: fontFamily);
    }
    textTheme = defaultTextTheme.merge(textTheme);
    primaryTextTheme = defaultPrimaryTextTheme.merge(primaryTextTheme);
    iconTheme ??= isDark ? const IconThemeData(color: Colors.white) : const IconThemeData(color: Colors.black87);
    primaryIconTheme ??= primaryIsDark ? const IconThemeData(color: Colors.white) : const IconThemeData(color: Colors.black);

    // COMPONENT THEMES
    appBarTheme ??= const AppBarTheme();
    bannerTheme ??= const MaterialBannerThemeData();
    bottomAppBarTheme ??= const BottomAppBarTheme();
    bottomNavigationBarTheme ??= const BottomNavigationBarThemeData();
    bottomSheetTheme ??= const BottomSheetThemeData();
    buttonBarTheme ??= const ButtonBarThemeData();
    cardTheme ??= const CardTheme();
    chipTheme ??= const ChipThemeData();
    checkboxTheme ??= const CheckboxThemeData();
    dataTableTheme ??= const DataTableThemeData();
    dialogTheme ??= const DialogTheme();
    dividerTheme ??= const DividerThemeData();
    drawerTheme ??= const DrawerThemeData();
    elevatedButtonTheme ??= const ElevatedButtonThemeData();
    floatingActionButtonTheme ??= const FloatingActionButtonThemeData();
    listTileTheme ??= const ListTileThemeData();
    navigationBarTheme ??= const NavigationBarThemeData();
    navigationRailTheme ??= const NavigationRailThemeData();
    outlinedButtonTheme ??= const OutlinedButtonThemeData();
    popupMenuTheme ??= const PopupMenuThemeData();
    progressIndicatorTheme ??= const ProgressIndicatorThemeData();
    radioTheme ??= const RadioThemeData();
    sliderTheme ??= const SliderThemeData();
    snackBarTheme ??= const SnackBarThemeData();
    switchTheme ??= const SwitchThemeData();
    tabBarTheme ??= const TabBarTheme();
    textButtonTheme ??= const TextButtonThemeData();
    textSelectionTheme ??= const TextSelectionThemeData();
    timePickerTheme ??= const TimePickerThemeData();
    toggleButtonsTheme ??= const ToggleButtonsThemeData();
    tooltipTheme ??= const TooltipThemeData();
    expansionTileTheme ??= const ExpansionTileThemeData();

     // DEPRECATED (newest deprecations at the bottom)
    useTextSelectionTheme ??= true;
    textSelectionColor ??= isDark ? accentColor : primarySwatch[200]!;
    cursorColor = cursorColor ?? const Color.fromRGBO(66, 133, 244, 1.0);
    textSelectionHandleColor ??= isDark ? Colors.tealAccent[400]! : primarySwatch[300]!;
    accentTextTheme = defaultAccentTextTheme.merge(accentTextTheme);
    accentIconTheme ??= accentIsDark ? const IconThemeData(color: Colors.white) : const IconThemeData(color: Colors.black);
    buttonColor ??= isDark ? primarySwatch[600]! : Colors.grey[300]!;
    fixTextFieldOutlineLabel ??= true;
    primaryColorBrightness = estimatedPrimaryColorBrightness;

    return ThemeData.raw(
      // GENERAL CONFIGURATION
      applyElevationOverlayColor: applyElevationOverlayColor,
      cupertinoOverrideTheme: cupertinoOverrideTheme,
      extensions: _themeExtensionIterableToMap(extensions),
      inputDecorationTheme: inputDecorationTheme,
      materialTapTargetSize: materialTapTargetSize,
      pageTransitionsTheme: pageTransitionsTheme,
      platform: platform,
      scrollbarTheme: scrollbarTheme,
      splashFactory: splashFactory,
      visualDensity: visualDensity,
      useMaterial3: useMaterial3,
      // COLOR
      colorScheme: colorScheme,
      primaryColor: primaryColor,
      primaryColorLight: primaryColorLight,
      primaryColorDark: primaryColorDark,
      focusColor: focusColor,
      hoverColor: hoverColor,
      shadowColor: shadowColor,
      canvasColor: canvasColor,
      scaffoldBackgroundColor: scaffoldBackgroundColor,
      bottomAppBarColor: bottomAppBarColor,
      cardColor: cardColor,
      dividerColor: dividerColor,
      highlightColor: highlightColor,
      splashColor: splashColor,
      selectedRowColor: selectedRowColor,
      unselectedWidgetColor: unselectedWidgetColor,
      disabledColor: disabledColor,
      secondaryHeaderColor: secondaryHeaderColor,
      backgroundColor: backgroundColor,
      dialogBackgroundColor: dialogBackgroundColor,
      indicatorColor: indicatorColor,
      hintColor: hintColor,
      errorColor: errorColor,
      toggleableActiveColor: toggleableActiveColor,
      // TYPOGRAPHY & ICONOGRAPHY
      typography: typography,
      textTheme: textTheme,
      primaryTextTheme: primaryTextTheme,
      iconTheme: iconTheme,
      primaryIconTheme: primaryIconTheme,
      // COMPONENT THEMES
      appBarTheme: appBarTheme,
      bannerTheme: bannerTheme,
      bottomAppBarTheme: bottomAppBarTheme,
      bottomNavigationBarTheme: bottomNavigationBarTheme,
      bottomSheetTheme: bottomSheetTheme,
      buttonBarTheme: buttonBarTheme,
      buttonTheme: buttonTheme,
      cardTheme: cardTheme,
      checkboxTheme: checkboxTheme,
      chipTheme: chipTheme,
      dataTableTheme: dataTableTheme,
      dialogTheme: dialogTheme,
      dividerTheme: dividerTheme,
      drawerTheme: drawerTheme,
      elevatedButtonTheme: elevatedButtonTheme,
      floatingActionButtonTheme: floatingActionButtonTheme,
      listTileTheme: listTileTheme,
      navigationBarTheme: navigationBarTheme,
      navigationRailTheme: navigationRailTheme,
      outlinedButtonTheme: outlinedButtonTheme,
      popupMenuTheme: popupMenuTheme,
      progressIndicatorTheme: progressIndicatorTheme,
      radioTheme: radioTheme,
      sliderTheme: sliderTheme,
      snackBarTheme: snackBarTheme,
      switchTheme: switchTheme,
      tabBarTheme: tabBarTheme,
      textButtonTheme: textButtonTheme,
      textSelectionTheme: textSelectionTheme,
      timePickerTheme: timePickerTheme,
      toggleButtonsTheme: toggleButtonsTheme,
      tooltipTheme: tooltipTheme,
      expansionTileTheme: expansionTileTheme,
      // DEPRECATED (newest deprecations at the bottom)
      useTextSelectionTheme: useTextSelectionTheme,
      textSelectionColor: textSelectionColor,
      cursorColor: cursorColor,
      textSelectionHandleColor: textSelectionHandleColor,
      accentColor: accentColor,
      accentColorBrightness: accentColorBrightness,
      accentTextTheme: accentTextTheme,
      accentIconTheme: accentIconTheme,
      buttonColor: buttonColor,
      fixTextFieldOutlineLabel: fixTextFieldOutlineLabel,
      primaryColorBrightness: primaryColorBrightness,
      androidOverscrollIndicator: androidOverscrollIndicator,
    );
  }

  /// Create a [ThemeData] given a set of exact values. All the values must be
  /// specified. They all must also be non-null except for
  /// [cupertinoOverrideTheme].
  ///
  /// This will rarely be used directly. It is used by [lerp] to
  /// create intermediate themes based on two themes created with the
  /// [ThemeData] constructor.
  const ThemeData.raw({
    // Warning: make sure these properties are in the exact same order as in
    // operator == and in the Object.hash method and in the order of fields
    // in this class, and in the lerp() method.
    // GENERAL CONFIGURATION
    required this.applyElevationOverlayColor,
    required this.cupertinoOverrideTheme,
    required this.extensions,
    required this.inputDecorationTheme,
    required this.materialTapTargetSize,
    required this.pageTransitionsTheme,
    required this.platform,
    required this.scrollbarTheme,
    required this.splashFactory,
    required this.visualDensity,
    required this.useMaterial3,
    // COLOR
    // [colorScheme] is the preferred way to configure colors. The other color
    // properties will gradually be phased out, see
    // https://github.com/flutter/flutter/issues/91772.
    required this.colorScheme,
    required this.primaryColor,
    required this.primaryColorLight,
    required this.primaryColorDark,
    required this.focusColor,
    required this.hoverColor,
    required this.shadowColor,
    required this.canvasColor,
    required this.scaffoldBackgroundColor,
    required this.bottomAppBarColor,
    required this.cardColor,
    required this.dividerColor,
    required this.highlightColor,
    required this.splashColor,
    required this.selectedRowColor,
    required this.unselectedWidgetColor,
    required this.disabledColor,
    required this.secondaryHeaderColor,
    required this.backgroundColor,
    required this.dialogBackgroundColor,
    required this.indicatorColor,
    required this.hintColor,
    required this.errorColor,
    required this.toggleableActiveColor,
    // TYPOGRAPHY & ICONOGRAPHY
    required this.typography,
    required this.textTheme,
    required this.primaryTextTheme,
    required this.iconTheme,
    required this.primaryIconTheme,
    // COMPONENT THEMES
    required this.appBarTheme,
    required this.bannerTheme,
    required this.bottomAppBarTheme,
    required this.bottomNavigationBarTheme,
    required this.bottomSheetTheme,
    required this.buttonBarTheme,
    required this.buttonTheme,
    required this.cardTheme,
    required this.checkboxTheme,
    required this.chipTheme,
    required this.dataTableTheme,
    required this.dialogTheme,
    required this.dividerTheme,
    required this.drawerTheme,
    required this.elevatedButtonTheme,
    required this.floatingActionButtonTheme,
    required this.listTileTheme,
    required this.navigationBarTheme,
    required this.navigationRailTheme,
    required this.outlinedButtonTheme,
    required this.popupMenuTheme,
    required this.progressIndicatorTheme,
    required this.radioTheme,
    required this.sliderTheme,
    required this.snackBarTheme,
    required this.switchTheme,
    required this.tabBarTheme,
    required this.textButtonTheme,
    required this.textSelectionTheme,
    required this.timePickerTheme,
    required this.toggleButtonsTheme,
    required this.tooltipTheme,
    required this.expansionTileTheme,
    // DEPRECATED (newest deprecations at the bottom)
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v1.23.0-4.0.pre.',
    )
    required this.useTextSelectionTheme,
    @Deprecated(
      'Use TextSelectionThemeData.selectionColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    required this.textSelectionColor,
    @Deprecated(
      'Use TextSelectionThemeData.cursorColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    required this.cursorColor,
    @Deprecated(
      'Use TextSelectionThemeData.selectionHandleColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    required this.textSelectionHandleColor,
    @Deprecated(
      'Use colorScheme.secondary instead. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    required this.accentColor,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    required this.accentColorBrightness,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    required this.accentTextTheme,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    required this.accentIconTheme,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v2.3.0-0.2.pre.',
    )
    required this.buttonColor,
    @Deprecated(
      'This "fix" is now enabled by default. '
      'This feature was deprecated after v2.5.0-1.0.pre.',
    )
    required this.fixTextFieldOutlineLabel,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v2.6.0-11.0.pre.',
    )
    required this.primaryColorBrightness,
    @Deprecated(
      'Use ThemeData.useMaterial3 or override ScrollBehavior.buildOverscrollIndicator. '
      'This feature was deprecated after v2.13.0-0.0.pre.'
    )
    required this.androidOverscrollIndicator,
  }) : // GENERAL CONFIGURATION
       assert(applyElevationOverlayColor != null),
       assert(extensions != null),
       assert(inputDecorationTheme != null),
       assert(materialTapTargetSize != null),
       assert(pageTransitionsTheme != null),
       assert(platform != null),
       assert(scrollbarTheme != null),
       assert(splashFactory != null),
       assert(visualDensity != null),
       assert(useMaterial3 != null),
        // COLOR
       assert(colorScheme != null),
       assert(primaryColor != null),
       assert(primaryColorLight != null),
       assert(primaryColorDark != null),
       assert(focusColor != null),
       assert(hoverColor != null),
       assert(shadowColor != null),
       assert(canvasColor != null),
       assert(scaffoldBackgroundColor != null),
       assert(bottomAppBarColor != null),
       assert(cardColor != null),
       assert(dividerColor != null),
       assert(highlightColor != null),
       assert(splashColor != null),
       assert(selectedRowColor != null),
       assert(unselectedWidgetColor != null),
       assert(disabledColor != null),
       assert(secondaryHeaderColor != null),
       assert(backgroundColor != null),
       assert(dialogBackgroundColor != null),
       assert(indicatorColor != null),
       assert(hintColor != null),
       assert(errorColor != null),
       assert(toggleableActiveColor != null),
        // TYPOGRAPHY & ICONOGRAPHY
       assert(typography != null),
       assert(textTheme != null),
       assert(primaryTextTheme != null),
       assert(iconTheme != null),
       assert(primaryIconTheme != null),
        // COMPONENT THEMES
       assert(appBarTheme != null),
       assert(bannerTheme != null),
       assert(bottomAppBarTheme != null),
       assert(bottomNavigationBarTheme != null),
       assert(bottomSheetTheme != null),
       assert(buttonBarTheme != null),
       assert(buttonTheme != null),
       assert(cardTheme != null),
       assert(checkboxTheme != null),
       assert(chipTheme != null),
       assert(dataTableTheme != null),
       assert(dialogTheme != null),
       assert(dividerTheme != null),
       assert(drawerTheme != null),
       assert(elevatedButtonTheme != null),
       assert(floatingActionButtonTheme != null),
       assert(listTileTheme != null),
       assert(navigationBarTheme != null),
       assert(navigationRailTheme != null),
       assert(outlinedButtonTheme != null),
       assert(popupMenuTheme != null),
       assert(progressIndicatorTheme != null),
       assert(radioTheme != null),
       assert(sliderTheme != null),
       assert(snackBarTheme != null),
       assert(switchTheme != null),
       assert(tabBarTheme != null),
       assert(textButtonTheme != null),
       assert(textSelectionTheme != null),
       assert(timePickerTheme != null),
       assert(toggleButtonsTheme != null),
       assert(tooltipTheme != null),
       assert(expansionTileTheme != null),
        // DEPRECATED (newest deprecations at the bottom)
       assert(useTextSelectionTheme != null),
       assert(textSelectionColor != null),
       assert(cursorColor != null),
       assert(textSelectionHandleColor != null),
       assert(accentColor != null),
       assert(accentColorBrightness != null),
       assert(accentTextTheme != null),
       assert(accentIconTheme != null),
       assert(buttonColor != null),
       assert(fixTextFieldOutlineLabel != null),
       assert(primaryColorBrightness != null);

  /// Create a [ThemeData] based on the colors in the given [colorScheme] and
  /// text styles of the optional [textTheme].
  ///
  /// The [colorScheme] can not be null.
  ///
  /// If [colorScheme].brightness is [Brightness.dark] then
  /// [ThemeData.applyElevationOverlayColor] will be set to true to support
  /// the Material dark theme method for indicating elevation by applying
  /// a semi-transparent onSurface color on top of the surface color.
  ///
  /// This is the recommended method to theme your application. As we move
  /// forward we will be converting all the widget implementations to only use
  /// colors or colors derived from those in [ColorScheme].
  ///
  /// {@tool snippet}
  /// This example will set up an application to use the baseline Material
  /// Design light and dark themes.
  ///
  /// ```dart
  /// MaterialApp(
  ///   theme: ThemeData.from(colorScheme: const ColorScheme.light()),
  ///   darkTheme: ThemeData.from(colorScheme: const ColorScheme.dark()),
  /// )
  /// ```
  /// {@end-tool}
  ///
  /// See <https://material.io/design/color/> for
  /// more discussion on how to pick the right colors.
  factory ThemeData.from({
    required ColorScheme colorScheme,
    TextTheme? textTheme,
    bool? useMaterial3,
  }) {
    final bool isDark = colorScheme.brightness == Brightness.dark;

    // For surfaces that use primary color in light themes and surface color in dark
    final Color primarySurfaceColor = isDark ? colorScheme.surface : colorScheme.primary;
    final Color onPrimarySurfaceColor = isDark ? colorScheme.onSurface : colorScheme.onPrimary;

    return ThemeData(
      colorScheme: colorScheme,
      brightness: colorScheme.brightness,
      primaryColor: primarySurfaceColor,
      primaryColorBrightness: ThemeData.estimateBrightnessForColor(primarySurfaceColor),
      canvasColor: colorScheme.background,
      accentColor: colorScheme.secondary,
      accentColorBrightness: ThemeData.estimateBrightnessForColor(colorScheme.secondary),
      scaffoldBackgroundColor: colorScheme.background,
      bottomAppBarColor: colorScheme.surface,
      cardColor: colorScheme.surface,
      dividerColor: colorScheme.onSurface.withOpacity(0.12),
      backgroundColor: colorScheme.background,
      dialogBackgroundColor: colorScheme.background,
      indicatorColor: onPrimarySurfaceColor,
      errorColor: colorScheme.error,
      textTheme: textTheme,
      applyElevationOverlayColor: isDark,
      useMaterial3: useMaterial3,
    );
  }

  /// A default light blue theme.
  ///
  /// This theme does not contain text geometry. Instead, it is expected that
  /// this theme is localized using text geometry using [ThemeData.localize].
  factory ThemeData.light() => ThemeData(brightness: Brightness.light);

  /// A default dark theme with a teal secondary [ColorScheme] color.
  ///
  /// This theme does not contain text geometry. Instead, it is expected that
  /// this theme is localized using text geometry using [ThemeData.localize].
  factory ThemeData.dark() => ThemeData(brightness: Brightness.dark);

  /// The default color theme. Same as [ThemeData.light].
  ///
  /// This is used by [Theme.of] when no theme has been specified.
  ///
  /// This theme does not contain text geometry. Instead, it is expected that
  /// this theme is localized using text geometry using [ThemeData.localize].
  ///
  /// Most applications would use [Theme.of], which provides correct localized
  /// text geometry.
  factory ThemeData.fallback() => ThemeData.light();

  /// The overall theme brightness.
  ///
  /// The default [TextStyle] color for the [textTheme] is black if the
  /// theme is constructed with [Brightness.light] and white if the
  /// theme is constructed with [Brightness.dark].
  Brightness get brightness => colorScheme.brightness;

  // Warning: make sure these properties are in the exact same order as in
  // Object.hash() and in the raw constructor and in the order of fields in
  // the class and in the lerp() method.

  // GENERAL CONFIGURATION

  /// Specifies which overscroll indicator to use on [TargetPlatform.android].
  ///
  /// When null, the default value of
  /// [MaterialScrollBehavior.androidOverscrollIndicator] is
  /// [AndroidOverscrollIndicator.glow].
  ///
  /// This property is deprecated. Use the [useMaterial3] flag instead, or
  /// override [ScrollBehavior.buildOverscrollIndicator].
  ///
  /// See also:
  ///
  ///   * [StretchingOverscrollIndicator], a material design edge effect
  ///     that transforms the contents of a scrollable when overscrolled.
  ///   * [GlowingOverscrollIndicator], an edge effect that paints a glow
  ///     over the contents of a scrollable when overscrolled.
  @Deprecated(
    'Use ThemeData.useMaterial3 or override ScrollBehavior.buildOverscrollIndicator. '
    'This feature was deprecated after v2.13.0-0.0.pre.'
  )
  final AndroidOverscrollIndicator? androidOverscrollIndicator;

  /// Apply a semi-transparent overlay color on Material surfaces to indicate
  /// elevation for dark themes.
  ///
  /// If [useMaterial3] is true, then this flag is ignored as there is a new
  /// [Material.surfaceTintColor] used to create an overlay for Material 3.
  /// This flag is meant only for the Material 2 elevation overlay for dark
  /// themes.
  ///
  /// Material drop shadows can be difficult to see in a dark theme, so the
  /// elevation of a surface should be portrayed with an "overlay" in addition
  /// to the shadow. As the elevation of the component increases, the
  /// overlay increases in opacity. [applyElevationOverlayColor] turns the
  /// application of this overlay on or off for dark themes.
  ///
  /// If true and [brightness] is [Brightness.dark], a
  /// semi-transparent version of [ColorScheme.onSurface] will be
  /// applied on top of [Material] widgets that have a [ColorScheme.surface]
  /// color. The level of transparency is based on [Material.elevation] as
  /// per the Material Dark theme specification.
  ///
  /// If false the surface color will be used unmodified.
  ///
  /// Defaults to false in order to maintain backwards compatibility with
  /// apps that were built before the Material Dark theme specification
  /// was published. New apps should set this to true for any themes
  /// where [brightness] is [Brightness.dark].
  ///
  /// See also:
  ///
  ///  * [Material.elevation], which effects the level of transparency of the
  ///    overlay color.
  ///  * [ElevationOverlay.applyOverlay], which is used by [Material] to apply
  ///    the overlay color to its surface color.
  ///  * <https://material.io/design/color/dark-theme.html>, which specifies how
  ///    the overlay should be applied.
  final bool applyElevationOverlayColor;

  /// Components of the [CupertinoThemeData] to override from the Material
  /// [ThemeData] adaptation.
  ///
  /// By default, [cupertinoOverrideTheme] is null and Cupertino widgets
  /// descendant to the Material [Theme] will adhere to a [CupertinoTheme]
  /// derived from the Material [ThemeData]. e.g. [ThemeData]'s [ColorScheme]
  /// will also inform the [CupertinoThemeData]'s `primaryColor` etc.
  ///
  /// This cascading effect for individual attributes of the [CupertinoThemeData]
  /// can be overridden using attributes of this [cupertinoOverrideTheme].
  final NoDefaultCupertinoThemeData? cupertinoOverrideTheme;

  /// Arbitrary additions to this theme.
  ///
  /// To define extensions, pass an [Iterable] containing one or more [ThemeExtension]
  /// subclasses to [ThemeData.new] or [copyWith].
  ///
  /// To obtain an extension, use [extension].
  ///
  /// {@tool dartpad}
  /// This sample shows how to create and use a subclass of [ThemeExtension] that
  /// defines two colors.
  ///
  /// ** See code in examples/api/lib/material/theme/theme_extension.1.dart **
  /// {@end-tool}
  ///
  /// See also:
  ///
  /// * [extension], a convenience function for obtaining a specific extension.
  final Map<Object, ThemeExtension<dynamic>> extensions;

  /// Used to obtain a particular [ThemeExtension] from [extensions].
  ///
  /// Obtain with `Theme.of(context).extension<MyThemeExtension>()`.
  ///
  /// See [extensions] for an interactive example.
  T? extension<T>() => extensions[T] as T;

  /// The default [InputDecoration] values for [InputDecorator], [TextField],
  /// and [TextFormField] are based on this theme.
  ///
  /// See [InputDecoration.applyDefaults].
  final InputDecorationTheme inputDecorationTheme;

  /// Configures the hit test size of certain Material widgets.
  ///
  /// Defaults to a [platform]-appropriate size: [MaterialTapTargetSize.padded]
  /// on mobile platforms, [MaterialTapTargetSize.shrinkWrap] on desktop
  /// platforms.
  final MaterialTapTargetSize materialTapTargetSize;

  /// Default [MaterialPageRoute] transitions per [TargetPlatform].
  ///
  /// [MaterialPageRoute.buildTransitions] delegates to a [platform] specific
  /// [PageTransitionsBuilder]. If a matching builder is not found, a builder
  /// whose platform is null is used.
  final PageTransitionsTheme pageTransitionsTheme;

  /// The platform the material widgets should adapt to target.
  ///
  /// Defaults to the current platform, as exposed by [defaultTargetPlatform].
  /// This should be used in order to style UI elements according to platform
  /// conventions.
  ///
  /// Widgets from the material library should use this getter (via [Theme.of])
  /// to determine the current platform for the purpose of emulating the
  /// platform behavior (e.g. scrolling or haptic effects). Widgets and render
  /// objects at lower layers that try to emulate the underlying platform
  /// platform can depend on [defaultTargetPlatform] directly, or may require
  /// that the target platform be provided as an argument. The
  /// [dart:io.Platform] object should only be used directly when it's critical
  /// to actually know the current platform, without any overrides possible (for
  /// example, when a system API is about to be called).
  ///
  /// In a test environment, the platform returned is [TargetPlatform.android]
  /// regardless of the host platform. (Android was chosen because the tests
  /// were originally written assuming Android-like behavior, and we added
  /// platform adaptations for other platforms later). Tests can check behavior
  /// for other platforms by setting the [platform] of the [Theme] explicitly to
  /// another [TargetPlatform] value, or by setting
  /// [debugDefaultTargetPlatformOverride].
  ///
  /// Determines the defaults for [typography] and [materialTapTargetSize].
  final TargetPlatform platform;

  /// A theme for customizing the colors, thickness, and shape of [Scrollbar]s.
  final ScrollbarThemeData scrollbarTheme;

  /// Defines the appearance of ink splashes produces by [InkWell]
  /// and [InkResponse].
  ///
  /// See also:
  ///
  ///  * [InkSplash.splashFactory], which defines the default splash.
  ///  * [InkRipple.splashFactory], which defines a splash that spreads out
  ///    more aggressively than the default.
  ///  * [InkSparkle.splashFactory], which defines a more aggressive and organic
  ///    splash with sparkle effects.
  final InteractiveInkFeatureFactory splashFactory;

  /// The density value for specifying the compactness of various UI components.
  ///
  /// {@template flutter.material.themedata.visualDensity}
  /// Density, in the context of a UI, is the vertical and horizontal
  /// "compactness" of the elements in the UI. It is unitless, since it means
  /// different things to different UI elements. For buttons, it affects the
  /// spacing around the centered label of the button. For lists, it affects the
  /// distance between baselines of entries in the list.
  ///
  /// Typically, density values are integral, but any value in range may be
  /// used. The range includes values from [VisualDensity.minimumDensity] (which
  /// is -4), to [VisualDensity.maximumDensity] (which is 4), inclusive, where
  /// negative values indicate a denser, more compact, UI, and positive values
  /// indicate a less dense, more expanded, UI. If a component doesn't support
  /// the value given, it will clamp to the nearest supported value.
  ///
  /// The default for visual densities is zero for both vertical and horizontal
  /// densities, which corresponds to the default visual density of components
  /// in the Material Design specification.
  ///
  /// As a rule of thumb, a change of 1 or -1 in density corresponds to 4
  /// logical pixels. However, this is not a strict relationship since
  /// components interpret the density values appropriately for their needs.
  ///
  /// A larger value translates to a spacing increase (less dense), and a
  /// smaller value translates to a spacing decrease (more dense).
  /// {@endtemplate}
  final VisualDensity visualDensity;

  /// A temporary flag used to opt-in to new Material 3 features.
  ///
  /// If true, then components that have been migrated to Material 3 will
  /// start using new colors, typography and other features of Material 3.
  /// If false, they will use the Material 2 look and feel.
  ///
  /// If a [ThemeData] is constructed with [useMaterial3] set to true, then
  /// some properties will get special defaults. However, just copying a [ThemeData]
  /// with [useMaterial3] set to true will not change any of these properties in the
  /// resulting [ThemeData]. These properties are:
  /// | Property | [useMaterial3] default | fallback default |
  /// |:---|:---|:---|
  /// | [typography] | [Typography.material2021] | [Typography.material2014] |
  /// | [splashFactory] | [InkSparkle]* | [InkSplash] |
  /// *if and only if the target platform is Android and the app is not running on the web.
  ///
  /// During the migration to Material 3, turning this on may yield
  /// inconsistent look and feel in your app. Some components will be migrated
  /// before others and typography changes will be coming in stages.
  ///
  /// [useMaterial3] defaults to false. After all the migrated components
  /// have landed on stable, we will change this to be true by default. After
  /// that change has landed on stable, we will deprecate this flag and remove
  /// all uses of it. Everything will use the Material 3 look and feel at
  /// that point.
  ///
  /// Components that have been migrated to Material 3 are:
  ///
  ///   * [AlertDialog]
  ///   * [Card]
  ///   * [Dialog]
  ///   * [FloatingActionButton]
  ///   * [Material]
  ///   * [NavigationBar]
  ///   * [NavigationRail]
  ///   * [StretchingOverscrollIndicator], replacing the
  ///     [GlowingOverscrollIndicator]
  ///
  /// See also:
  ///
  ///   * [Material Design 3](https://m3.material.io/).
  final bool useMaterial3;

  // COLOR

  /// A set of twelve colors that can be used to configure the
  /// color properties of most components.
  ///
  /// This property was added much later than the theme's set of highly
  /// specific colors, like [cardColor], [buttonColor], [canvasColor] etc.
  /// New components can be defined exclusively in terms of [colorScheme].
  /// Existing components will gradually migrate to it, to the extent
  /// that is possible without significant backwards compatibility breaks.
  final ColorScheme colorScheme;

  /// The background color for major parts of the app (toolbars, tab bars, etc)
  ///
  /// The theme's [colorScheme] property contains [ColorScheme.primary], as
  /// well as a color that contrasts well with the primary color called
  /// [ColorScheme.onPrimary]. It might be simpler to just configure an app's
  /// visuals in terms of the theme's [colorScheme].
  final Color primaryColor;

  /// A lighter version of the [primaryColor].
  final Color primaryColorLight;

  /// A darker version of the [primaryColor].
  final Color primaryColorDark;

  /// The focus color used indicate that a component has the input focus.
  final Color focusColor;

  /// The hover color used to indicate when a pointer is hovering over a
  /// component.
  final Color hoverColor;

  /// The color that the [Material] widget uses to draw elevation shadows.
  ///
  /// Defaults to fully opaque black.
  ///
  /// Shadows can be difficult to see in a dark theme, so the elevation of a
  /// surface should be rendered with an "overlay" in addition to the shadow.
  /// As the elevation of the component increases, the overlay increases in
  /// opacity. The [applyElevationOverlayColor] property turns the elevation
  /// overlay on or off for dark themes.
  final Color shadowColor;

  /// The default color of [MaterialType.canvas] [Material].
  final Color canvasColor;

  /// The default color of the [Material] that underlies the [Scaffold]. The
  /// background color for a typical material app or a page within the app.
  final Color scaffoldBackgroundColor;

  /// The default color of the [BottomAppBar].
  ///
  /// This can be overridden by specifying [BottomAppBar.color].
  final Color bottomAppBarColor;

  /// The color of [Material] when it is used as a [Card].
  final Color cardColor;

  /// The color of [Divider]s and [PopupMenuDivider]s, also used
  /// between [ListTile]s, between rows in [DataTable]s, and so forth.
  ///
  /// To create an appropriate [BorderSide] that uses this color, consider
  /// [Divider.createBorderSide].
  final Color dividerColor;

  /// The highlight color used during ink splash animations or to
  /// indicate an item in a menu is selected.
  final Color highlightColor;

  /// The color of ink splashes.
  ///
  /// See also:
  ///  * [splashFactory], which defines the appearance of the splash.
  final Color splashColor;

  /// The color used to highlight selected rows.
  final Color selectedRowColor;

  /// The color used for widgets in their inactive (but enabled)
  /// state. For example, an unchecked checkbox. See also [disabledColor].
  final Color unselectedWidgetColor;

  /// The color used for widgets that are inoperative, regardless of
  /// their state. For example, a disabled checkbox (which may be
  /// checked or unchecked).
  final Color disabledColor;

  /// The color of the header of a [PaginatedDataTable] when there are selected rows.
  // According to the spec for data tables:
  // https://material.io/archive/guidelines/components/data-tables.html#data-tables-tables-within-cards
  // ...this should be the "50-value of secondary app color".
  final Color secondaryHeaderColor;

  /// A color that contrasts with the [primaryColor], e.g. used as the
  /// remaining part of a progress bar.
  final Color backgroundColor;

  /// The background color of [Dialog] elements.
  final Color dialogBackgroundColor;

  /// The color of the selected tab indicator in a tab bar.
  final Color indicatorColor;

  /// The color to use for hint text or placeholder text, e.g. in
  /// [TextField] fields.
  final Color hintColor;

  /// The color to use for input validation errors, e.g. in [TextField] fields.
  final Color errorColor;

  /// The color used to highlight the active states of toggleable widgets like
  /// [Switch], [Radio], and [Checkbox].
  final Color toggleableActiveColor;

  // TYPOGRAPHY & ICONOGRAPHY

  /// The color and geometry [TextTheme] values used to configure [textTheme].
  ///
  /// Defaults to a [platform]-appropriate typography.
  final Typography typography;

  /// Text with a color that contrasts with the card and canvas colors.
  final TextTheme textTheme;

  /// A text theme that contrasts with the primary color.
  final TextTheme primaryTextTheme;

  /// An icon theme that contrasts with the card and canvas colors.
  final IconThemeData iconTheme;

  /// An icon theme that contrasts with the primary color.
  final IconThemeData primaryIconTheme;

  // COMPONENT THEMES

  /// A theme for customizing the color, elevation, brightness, iconTheme and
  /// textTheme of [AppBar]s.
  final AppBarTheme appBarTheme;

  /// A theme for customizing the color and text style of a [MaterialBanner].
  final MaterialBannerThemeData bannerTheme;

  /// A theme for customizing the shape, elevation, and color of a [BottomAppBar].
  final BottomAppBarTheme bottomAppBarTheme;

  /// A theme for customizing the appearance and layout of [BottomNavigationBar]
  /// widgets.
  final BottomNavigationBarThemeData bottomNavigationBarTheme;

  /// A theme for customizing the color, elevation, and shape of a bottom sheet.
  final BottomSheetThemeData bottomSheetTheme;

  /// A theme for customizing the appearance and layout of [ButtonBar] widgets.
  final ButtonBarThemeData buttonBarTheme;

  /// Defines the default configuration of button widgets, like [RaisedButton]
  /// and [FlatButton].
  final ButtonThemeData buttonTheme;

  /// The colors and styles used to render [Card].
  ///
  /// This is the value returned from [CardTheme.of].
  final CardTheme cardTheme;

  /// A theme for customizing the appearance and layout of [Checkbox] widgets.
  final CheckboxThemeData checkboxTheme;

  /// The colors and styles used to render [Chip]s.
  ///
  /// This is the value returned from [ChipTheme.of].
  final ChipThemeData chipTheme;

  /// A theme for customizing the appearance and layout of [DataTable]
  /// widgets.
  final DataTableThemeData dataTableTheme;

  /// A theme for customizing the shape of a dialog.
  final DialogTheme dialogTheme;

  /// A theme for customizing the color, thickness, and indents of [Divider]s,
  /// [VerticalDivider]s, etc.
  final DividerThemeData dividerTheme;

  /// A theme for customizing the appearance and layout of [Drawer] widgets.
  final DrawerThemeData drawerTheme;

  /// A theme for customizing the appearance and internal layout of
  /// [ElevatedButton]s.
  final ElevatedButtonThemeData elevatedButtonTheme;

  /// A theme for customizing the shape, elevation, and color of a
  /// [FloatingActionButton].
  final FloatingActionButtonThemeData floatingActionButtonTheme;

  /// A theme for customizing the appearance of [ListTile] widgets.
  final ListTileThemeData listTileTheme;

  /// A theme for customizing the background color, text style, and icon themes
  /// of a [NavigationBar].
  final NavigationBarThemeData navigationBarTheme;

  /// A theme for customizing the background color, elevation, text style, and
  /// icon themes of a [NavigationRail].
  final NavigationRailThemeData navigationRailTheme;

  /// A theme for customizing the appearance and internal layout of
  /// [OutlinedButton]s.
  final OutlinedButtonThemeData outlinedButtonTheme;

  /// A theme for customizing the color, shape, elevation, and text style of
  /// popup menus.
  final PopupMenuThemeData popupMenuTheme;

  /// A theme for customizing the appearance and layout of [ProgressIndicator] widgets.
  final ProgressIndicatorThemeData progressIndicatorTheme;

  /// A theme for customizing the appearance and layout of [Radio] widgets.
  final RadioThemeData radioTheme;

  /// The colors and shapes used to render [Slider].
  ///
  /// This is the value returned from [SliderTheme.of].
  final SliderThemeData sliderTheme;

  /// A theme for customizing colors, shape, elevation, and behavior of a [SnackBar].
  final SnackBarThemeData snackBarTheme;

  /// A theme for customizing the appearance and layout of [Switch] widgets.
  final SwitchThemeData switchTheme;

  /// A theme for customizing the size, shape, and color of the tab bar indicator.
  final TabBarTheme tabBarTheme;

  /// A theme for customizing the appearance and internal layout of
  /// [TextButton]s.
  final TextButtonThemeData textButtonTheme;

  /// A theme for customizing the appearance and layout of [TextField] widgets.
  final TextSelectionThemeData textSelectionTheme;

  /// A theme for customizing the appearance and layout of time picker widgets.
  final TimePickerThemeData timePickerTheme;

  /// Defines the default configuration of [ToggleButtons] widgets.
  final ToggleButtonsThemeData toggleButtonsTheme;

  /// A theme for customizing the visual properties of [Tooltip]s.
  ///
  /// This is the value returned from [TooltipTheme.of].
  final TooltipThemeData tooltipTheme;

  /// A theme for customizing the visual properties of [ExpansionTile]s.
  final ExpansionTileThemeData expansionTileTheme;

  // DEPRECATED (newest deprecations at the bottom)

  /// A temporary flag that was used to opt-in to the new [TextSelectionTheme]
  /// during the migration to this new theme. That migration is now complete
  /// and this flag is not longer used by the framework. Please remove any
  /// reference to this property, as it will be removed in future releases.
  @Deprecated(
    'No longer used by the framework, please remove any reference to it. '
    'This feature was deprecated after v1.23.0-4.0.pre.',
  )
  final bool useTextSelectionTheme;

  /// The color of text selections in text fields, such as [TextField].
  @Deprecated(
    'Use TextSelectionThemeData.selectionColor instead. '
    'This feature was deprecated after v1.26.0-18.0.pre.',
  )
  final Color textSelectionColor;

  /// The color of cursors in Material-style text fields, such as [TextField].
  @Deprecated(
    'Use TextSelectionThemeData.cursorColor instead. '
    'This feature was deprecated after v1.26.0-18.0.pre.',
  )
  final Color cursorColor;

  /// The color of the handles used to adjust what part of the text is currently selected.
  @Deprecated(
    'Use TextSelectionThemeData.selectionHandleColor instead. '
    'This feature was deprecated after v1.26.0-18.0.pre.',
  )
  final Color textSelectionHandleColor;

  /// Obsolete property that was originally used as the foreground
  /// color for widgets (knobs, text, overscroll edge effect, etc).
  ///
  /// The material library no longer uses this property. In most cases
  /// the theme's [colorScheme] [ColorScheme.secondary] property is now
  /// used instead.
  ///
  /// Apps should migrate uses of this property to the theme's [colorScheme]
  /// [ColorScheme.secondary] color. In cases where a color is needed that
  /// that contrasts well with the secondary color [ColorScheme.onSecondary]
  /// can be used.
  @Deprecated(
    'Use colorScheme.secondary instead. '
    'For more information, consult the migration guide at '
    'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
    'This feature was deprecated after v2.3.0-0.1.pre.',
  )
  final Color accentColor;

  /// Obsolete property that was originally used to determine the color
  /// of text and icons placed on top of the accent color (e.g. the
  /// icons on a floating action button).
  ///
  /// The material library no longer uses this property. The
  /// [floatingActionButtonTheme] can be used to configure
  /// the appearance of [FloatingActionButton]s. The brightness
  /// of any color can be found with [ThemeData.estimateBrightnessForColor].
  @Deprecated(
    'No longer used by the framework, please remove any reference to it. '
    'For more information, consult the migration guide at '
    'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
    'This feature was deprecated after v2.3.0-0.1.pre.',
  )
  final Brightness accentColorBrightness;

  /// Obsolete property that was originally used when a [TextTheme]
  /// that contrasted well with the [accentColor] was needed.
  ///
  /// The material library no longer uses this property and most uses
  /// of [accentColor] have been replaced with
  /// the theme's [colorScheme] [ColorScheme.secondary].
  /// You can configure the color of a [textTheme] [TextStyle] so that it
  /// contrasts well with the [ColorScheme.secondary] like this:
  ///
  /// ```dart
  /// final ThemeData theme = Theme.of(context);
  /// theme.textTheme.headline1.copyWith(
  ///   color: theme.colorScheme.onSecondary,
  /// )
  /// ```
  @Deprecated(
    'No longer used by the framework, please remove any reference to it. '
    'For more information, consult the migration guide at '
    'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
    'This feature was deprecated after v2.3.0-0.1.pre.',
  )
  final TextTheme accentTextTheme;

  /// Obsolete property that was originally used when an [IconTheme]
  /// that contrasted well with the [accentColor] was needed.
  ///
  /// The material library no longer uses this property and most uses
  /// of [accentColor] have been replaced with
  /// the theme's [colorScheme] [ColorScheme.secondary].
  @Deprecated(
    'No longer used by the framework, please remove any reference to it. '
    'For more information, consult the migration guide at '
    'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
    'This feature was deprecated after v2.3.0-0.1.pre.',
  )
  final IconThemeData accentIconTheme;

  /// The default fill color of the [Material] used in [RaisedButton]s.
  @Deprecated(
    'No longer used by the framework, please remove any reference to it. '
    'This feature was deprecated after v2.3.0-0.2.pre.',
  )
  final Color buttonColor;

  /// An obsolete flag to allow apps to opt-out of a
  /// [small fix](https://github.com/flutter/flutter/issues/54028) for the Y
  /// coordinate of the floating label in a [TextField] [OutlineInputBorder].
  ///
  /// Setting this flag to true causes the floating label to be more precisely
  /// vertically centered relative to the border's outline.
  ///
  /// The flag is true by default and its use is deprecated.
  @Deprecated(
    'This "fix" is now enabled by default. '
    'This feature was deprecated after v2.5.0-1.0.pre.',
  )
  final bool fixTextFieldOutlineLabel;

  /// Obsolete property that was originally used to determine the color
  /// of text and icons placed on top of the primary color (e.g. toolbar text).
  ///
  /// The material library no longer uses this property. The [appBarTheme] can
  /// be used to configure the appearance of [AppBar]s. The appearance of
  /// Keyboards for [TextField]s now uses the overall theme's
  /// [ThemeData.brightness] and can also be customized with
  /// [TextField.keyboardAppearance]. The brightness of any color can be found
  /// with [ThemeData.estimateBrightnessForColor].
  @Deprecated(
    'No longer used by the framework, please remove any reference to it. '
    'This feature was deprecated after v2.6.0-11.0.pre.',
  )
  final Brightness primaryColorBrightness;

  /// Creates a copy of this theme but with the given fields replaced with the new values.
  ///
  /// The [brightness] value is applied to the [colorScheme].
  ThemeData copyWith({
    // GENERAL CONFIGURATION
    bool? applyElevationOverlayColor,
    NoDefaultCupertinoThemeData? cupertinoOverrideTheme,
    Iterable<ThemeExtension<dynamic>>? extensions,
    InputDecorationTheme? inputDecorationTheme,
    MaterialTapTargetSize? materialTapTargetSize,
    PageTransitionsTheme? pageTransitionsTheme,
    TargetPlatform? platform,
    ScrollbarThemeData? scrollbarTheme,
    InteractiveInkFeatureFactory? splashFactory,
    VisualDensity? visualDensity,
    bool? useMaterial3,
    // COLOR
    // [colorScheme] is the preferred way to configure colors. The other color
    // properties will gradually be phased out, see
    // https://github.com/flutter/flutter/issues/91772.
    ColorScheme? colorScheme,
    Brightness? brightness,
    Color? primaryColor,
    Color? primaryColorLight,
    Color? primaryColorDark,
    Color? focusColor,
    Color? hoverColor,
    Color? shadowColor,
    Color? canvasColor,
    Color? scaffoldBackgroundColor,
    Color? bottomAppBarColor,
    Color? cardColor,
    Color? dividerColor,
    Color? highlightColor,
    Color? splashColor,
    Color? selectedRowColor,
    Color? unselectedWidgetColor,
    Color? disabledColor,
    Color? secondaryHeaderColor,
    Color? backgroundColor,
    Color? dialogBackgroundColor,
    Color? indicatorColor,
    Color? hintColor,
    Color? errorColor,
    Color? toggleableActiveColor,
    // TYPOGRAPHY & ICONOGRAPHY
    Typography? typography,
    TextTheme? textTheme,
    TextTheme? primaryTextTheme,
    IconThemeData? iconTheme,
    IconThemeData? primaryIconTheme,
    // COMPONENT THEMES
    AppBarTheme? appBarTheme,
    MaterialBannerThemeData? bannerTheme,
    BottomAppBarTheme? bottomAppBarTheme,
    BottomNavigationBarThemeData? bottomNavigationBarTheme,
    BottomSheetThemeData? bottomSheetTheme,
    ButtonBarThemeData? buttonBarTheme,
    ButtonThemeData? buttonTheme,
    CardTheme? cardTheme,
    CheckboxThemeData? checkboxTheme,
    ChipThemeData? chipTheme,
    DataTableThemeData? dataTableTheme,
    DialogTheme? dialogTheme,
    DividerThemeData? dividerTheme,
    DrawerThemeData? drawerTheme,
    ElevatedButtonThemeData? elevatedButtonTheme,
    FloatingActionButtonThemeData? floatingActionButtonTheme,
    ListTileThemeData? listTileTheme,
    NavigationBarThemeData? navigationBarTheme,
    NavigationRailThemeData? navigationRailTheme,
    OutlinedButtonThemeData? outlinedButtonTheme,
    PopupMenuThemeData? popupMenuTheme,
    ProgressIndicatorThemeData? progressIndicatorTheme,
    RadioThemeData? radioTheme,
    SliderThemeData? sliderTheme,
    SnackBarThemeData? snackBarTheme,
    SwitchThemeData? switchTheme,
    TabBarTheme? tabBarTheme,
    TextButtonThemeData? textButtonTheme,
    TextSelectionThemeData? textSelectionTheme,
    TimePickerThemeData? timePickerTheme,
    ToggleButtonsThemeData? toggleButtonsTheme,
    TooltipThemeData? tooltipTheme,
    ExpansionTileThemeData? expansionTileTheme,
    // DEPRECATED (newest deprecations at the bottom)
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v1.23.0-4.0.pre.',
    )
    bool? useTextSelectionTheme,
    @Deprecated(
      'Use TextSelectionThemeData.selectionColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    Color? textSelectionColor,
    @Deprecated(
      'Use TextSelectionThemeData.cursorColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    Color? cursorColor,
    @Deprecated(
      'Use TextSelectionThemeData.selectionHandleColor instead. '
      'This feature was deprecated after v1.26.0-18.0.pre.',
    )
    Color? textSelectionHandleColor,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    Color? accentColor,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    Brightness? accentColorBrightness,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    TextTheme? accentTextTheme,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'For more information, consult the migration guide at '
      'https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. '
      'This feature was deprecated after v2.3.0-0.1.pre.',
    )
    IconThemeData? accentIconTheme,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v2.3.0-0.2.pre.',
    )
    Color? buttonColor,
    @Deprecated(
      'This "fix" is now enabled by default. '
      'This feature was deprecated after v2.5.0-1.0.pre.',
    )
    bool? fixTextFieldOutlineLabel,
    @Deprecated(
      'No longer used by the framework, please remove any reference to it. '
      'This feature was deprecated after v2.6.0-11.0.pre.',
    )
    Brightness? primaryColorBrightness,
    @Deprecated(
      'Use ThemeData.useMaterial3 or override ScrollBehavior.buildOverscrollIndicator. '
      'This feature was deprecated after v2.13.0-0.0.pre.'
    )
    AndroidOverscrollIndicator? androidOverscrollIndicator,
  }) {
    cupertinoOverrideTheme = cupertinoOverrideTheme?.noDefault();
    return ThemeData.raw(
      // GENERAL CONFIGURATION
      applyElevationOverlayColor: applyElevationOverlayColor ?? this.applyElevationOverlayColor,
      cupertinoOverrideTheme: cupertinoOverrideTheme ?? this.cupertinoOverrideTheme,
      extensions: (extensions != null) ? _themeExtensionIterableToMap(extensions) : this.extensions,
      inputDecorationTheme: inputDecorationTheme ?? this.inputDecorationTheme,
      materialTapTargetSize: materialTapTargetSize ?? this.materialTapTargetSize,
      pageTransitionsTheme: pageTransitionsTheme ?? this.pageTransitionsTheme,
      platform: platform ?? this.platform,
      scrollbarTheme: scrollbarTheme ?? this.scrollbarTheme,
      splashFactory: splashFactory ?? this.splashFactory,
      visualDensity: visualDensity ?? this.visualDensity,
      useMaterial3: useMaterial3 ?? this.useMaterial3,
      // COLOR
      colorScheme: (colorScheme ?? this.colorScheme).copyWith(brightness: brightness),
      primaryColor: primaryColor ?? this.primaryColor,
      primaryColorLight: primaryColorLight ?? this.primaryColorLight,
      primaryColorDark: primaryColorDark ?? this.primaryColorDark,
      focusColor: focusColor ?? this.focusColor,
      hoverColor: hoverColor ?? this.hoverColor,
      shadowColor: shadowColor ?? this.shadowColor,
      canvasColor: canvasColor ?? this.canvasColor,
      scaffoldBackgroundColor: scaffoldBackgroundColor ?? this.scaffoldBackgroundColor,
      bottomAppBarColor: bottomAppBarColor ?? this.bottomAppBarColor,
      cardColor: cardColor ?? this.cardColor,
      dividerColor: dividerColor ?? this.dividerColor,
      highlightColor: highlightColor ?? this.highlightColor,
      splashColor: splashColor ?? this.splashColor,
      selectedRowColor: selectedRowColor ?? this.selectedRowColor,
      unselectedWidgetColor: unselectedWidgetColor ?? this.unselectedWidgetColor,
      disabledColor: disabledColor ?? this.disabledColor,
      secondaryHeaderColor: secondaryHeaderColor ?? this.secondaryHeaderColor,
      backgroundColor: backgroundColor ?? this.backgroundColor,
      dialogBackgroundColor: dialogBackgroundColor ?? this.dialogBackgroundColor,
      indicatorColor: indicatorColor ?? this.indicatorColor,
      hintColor: hintColor ?? this.hintColor,
      errorColor: errorColor ?? this.errorColor,
      toggleableActiveColor: toggleableActiveColor ?? this.toggleableActiveColor,
      // TYPOGRAPHY & ICONOGRAPHY
      typography: typography ?? this.typography,
      textTheme: textTheme ?? this.textTheme,
      primaryTextTheme: primaryTextTheme ?? this.primaryTextTheme,
      iconTheme: iconTheme ?? this.iconTheme,
      primaryIconTheme: primaryIconTheme ?? this.primaryIconTheme,
      // COMPONENT THEMES
      appBarTheme: appBarTheme ?? this.appBarTheme,
      bannerTheme: bannerTheme ?? this.bannerTheme,
      bottomAppBarTheme: bottomAppBarTheme ?? this.bottomAppBarTheme,
      bottomNavigationBarTheme: bottomNavigationBarTheme ?? this.bottomNavigationBarTheme,
      bottomSheetTheme: bottomSheetTheme ?? this.bottomSheetTheme,
      buttonBarTheme: buttonBarTheme ?? this.buttonBarTheme,
      buttonTheme: buttonTheme ?? this.buttonTheme,
      cardTheme: cardTheme ?? this.cardTheme,
      checkboxTheme: checkboxTheme ?? this.checkboxTheme,
      chipTheme: chipTheme ?? this.chipTheme,
      dataTableTheme: dataTableTheme ?? this.dataTableTheme,
      dialogTheme: dialogTheme ?? this.dialogTheme,
      dividerTheme: dividerTheme ?? this.dividerTheme,
      drawerTheme: drawerTheme ?? this.drawerTheme,
      elevatedButtonTheme: elevatedButtonTheme ?? this.elevatedButtonTheme,
      floatingActionButtonTheme: floatingActionButtonTheme ?? this.floatingActionButtonTheme,
      listTileTheme: listTileTheme ?? this.listTileTheme,
      navigationBarTheme: navigationBarTheme ?? this.navigationBarTheme,
      navigationRailTheme: navigationRailTheme ?? this.navigationRailTheme,
      outlinedButtonTheme: outlinedButtonTheme ?? this.outlinedButtonTheme,
      popupMenuTheme: popupMenuTheme ?? this.popupMenuTheme,
      progressIndicatorTheme: progressIndicatorTheme ?? this.progressIndicatorTheme,
      radioTheme: radioTheme ?? this.radioTheme,
      sliderTheme: sliderTheme ?? this.sliderTheme,
      snackBarTheme: snackBarTheme ?? this.snackBarTheme,
      switchTheme: switchTheme ?? this.switchTheme,
      tabBarTheme: tabBarTheme ?? this.tabBarTheme,
      textButtonTheme: textButtonTheme ?? this.textButtonTheme,
      textSelectionTheme: textSelectionTheme ?? this.textSelectionTheme,
      timePickerTheme: timePickerTheme ?? this.timePickerTheme,
      toggleButtonsTheme: toggleButtonsTheme ?? this.toggleButtonsTheme,
      tooltipTheme: tooltipTheme ?? this.tooltipTheme,
      expansionTileTheme: expansionTileTheme ?? this.expansionTileTheme,
      // DEPRECATED (newest deprecations at the bottom)
      useTextSelectionTheme: useTextSelectionTheme ?? this.useTextSelectionTheme,
      textSelectionColor: textSelectionColor ?? this.textSelectionColor,
      cursorColor: cursorColor ?? this.cursorColor,
      textSelectionHandleColor: textSelectionHandleColor ?? this.textSelectionHandleColor,
      accentColor: accentColor ?? this.accentColor,
      accentColorBrightness: accentColorBrightness ?? this.accentColorBrightness,
      accentTextTheme: accentTextTheme ?? this.accentTextTheme,
      accentIconTheme: accentIconTheme ?? this.accentIconTheme,
      buttonColor: buttonColor ?? this.buttonColor,
      fixTextFieldOutlineLabel: fixTextFieldOutlineLabel ?? this.fixTextFieldOutlineLabel,
      primaryColorBrightness: primaryColorBrightness ?? this.primaryColorBrightness,
      androidOverscrollIndicator: androidOverscrollIndicator ?? this.androidOverscrollIndicator,
    );
  }

  // The number 5 was chosen without any real science or research behind it. It
  // just seemed like a number that's not too big (we should be able to fit 5
  // copies of ThemeData in memory comfortably) and not too small (most apps
  // shouldn't have more than 5 theme/localization pairs).
  static const int _localizedThemeDataCacheSize = 5;

  /// Caches localized themes to speed up the [localize] method.
  static final _FifoCache<_IdentityThemeDataCacheKey, ThemeData> _localizedThemeDataCache =
      _FifoCache<_IdentityThemeDataCacheKey, ThemeData>(_localizedThemeDataCacheSize);

  /// Returns a new theme built by merging the text geometry provided by the
  /// [localTextGeometry] theme with the [baseTheme].
  ///
  /// For those text styles in the [baseTheme] whose [TextStyle.inherit] is set
  /// to true, the returned theme's text styles inherit the geometric properties
  /// of [localTextGeometry]. The resulting text styles' [TextStyle.inherit] is
  /// set to those provided by [localTextGeometry].
  static ThemeData localize(ThemeData baseTheme, TextTheme localTextGeometry) {
    // WARNING: this method memoizes the result in a cache based on the
    // previously seen baseTheme and localTextGeometry. Memoization is safe
    // because all inputs and outputs of this function are deeply immutable, and
    // the computations are referentially transparent. It only short-circuits
    // the computation if the new inputs are identical() to the previous ones.
    // It does not use the == operator, which performs a costly deep comparison.
    //
    // When changing this method, make sure the memoization logic is correct.
    // Remember:
    //
    // There are only two hard things in Computer Science: cache invalidation
    // and naming things. -- Phil Karlton
    assert(baseTheme != null);
    assert(localTextGeometry != null);

    return _localizedThemeDataCache.putIfAbsent(
      _IdentityThemeDataCacheKey(baseTheme, localTextGeometry),
      () {
        return baseTheme.copyWith(
          primaryTextTheme: localTextGeometry.merge(baseTheme.primaryTextTheme),
          accentTextTheme: localTextGeometry.merge(baseTheme.accentTextTheme),
          textTheme: localTextGeometry.merge(baseTheme.textTheme),
        );
      },
    );
  }

  /// Determines whether the given [Color] is [Brightness.light] or
  /// [Brightness.dark].
  ///
  /// This compares the luminosity of the given color to a threshold value that
  /// matches the material design specification.
  static Brightness estimateBrightnessForColor(Color color) {
    final double relativeLuminance = color.computeLuminance();

    // See <https://www.w3.org/TR/WCAG20/#contrast-ratiodef>
    // The spec says to use kThreshold=0.0525, but Material Design appears to bias
    // more towards using light text than WCAG20 recommends. Material Design spec
    // doesn't say what value to use, but 0.15 seemed close to what the Material
    // Design spec shows for its color palette on
    // <https://material.io/go/design-theming#color-color-palette>.
    const double kThreshold = 0.15;
    if ((relativeLuminance + 0.05) * (relativeLuminance + 0.05) > kThreshold)
      return Brightness.light;
    return Brightness.dark;
  }

  /// Linearly interpolate between two [extensions].
  ///
  /// Includes all theme extensions in [a] and [b].
  ///
  /// {@macro dart.ui.shadow.lerp}
  static Map<Object, ThemeExtension<dynamic>> _lerpThemeExtensions(ThemeData a, ThemeData b, double t) {
    // Lerp [a].
    final Map<Object, ThemeExtension<dynamic>> newExtensions = a.extensions.map((Object id, ThemeExtension<dynamic> extensionA) {
        final ThemeExtension<dynamic>? extensionB = b.extensions[id];
        return MapEntry<Object, ThemeExtension<dynamic>>(id, extensionA.lerp(extensionB, t));
      });
    // Add [b]-only extensions.
    newExtensions.addEntries(b.extensions.entries.where(
      (MapEntry<Object, ThemeExtension<dynamic>> entry) =>
          !a.extensions.containsKey(entry.key)));

    return newExtensions;
  }

  /// Convert the [extensionsIterable] passed to [ThemeData.new] or [copyWith]
  /// to the stored [extensions] map, where each entry's key consists of the extension's type.
  static Map<Object, ThemeExtension<dynamic>> _themeExtensionIterableToMap(Iterable<ThemeExtension<dynamic>> extensionsIterable) {
    return Map<Object, ThemeExtension<dynamic>>.unmodifiable(<Object, ThemeExtension<dynamic>>{
      // Strangely, the cast is necessary for tests to run.
      for (final ThemeExtension<dynamic> extension in extensionsIterable) extension.type: extension as ThemeExtension<ThemeExtension<dynamic>>
    });
  }

  /// Linearly interpolate between two themes.
  ///
  /// The arguments must not be null.
  ///
  /// {@macro dart.ui.shadow.lerp}
  static ThemeData lerp(ThemeData a, ThemeData b, double t) {
    assert(a != null);
    assert(b != null);
    assert(t != null);
    // Warning: make sure these properties are in the exact same order as in
    // Object.hash() and in the raw constructor and in the order of fields in
    // the class and in the lerp() method.
    return ThemeData.raw(
      // GENERAL CONFIGURATION
      applyElevationOverlayColor:t < 0.5 ? a.applyElevationOverlayColor : b.applyElevationOverlayColor,
      cupertinoOverrideTheme:t < 0.5 ? a.cupertinoOverrideTheme : b.cupertinoOverrideTheme,
      extensions: _lerpThemeExtensions(a, b, t),
      inputDecorationTheme:t < 0.5 ? a.inputDecorationTheme : b.inputDecorationTheme,
      materialTapTargetSize:t < 0.5 ? a.materialTapTargetSize : b.materialTapTargetSize,
      pageTransitionsTheme:t < 0.5 ? a.pageTransitionsTheme : b.pageTransitionsTheme,
      platform: t < 0.5 ? a.platform : b.platform,
      scrollbarTheme: ScrollbarThemeData.lerp(a.scrollbarTheme, b.scrollbarTheme, t),
      splashFactory: t < 0.5 ? a.splashFactory : b.splashFactory,
      visualDensity: VisualDensity.lerp(a.visualDensity, b.visualDensity, t),
      useMaterial3: t < 0.5 ? a.useMaterial3 : b.useMaterial3,
      // COLOR
      colorScheme: ColorScheme.lerp(a.colorScheme, b.colorScheme, t),
      primaryColor: Color.lerp(a.primaryColor, b.primaryColor, t)!,
      primaryColorLight: Color.lerp(a.primaryColorLight, b.primaryColorLight, t)!,
      primaryColorDark: Color.lerp(a.primaryColorDark, b.primaryColorDark, t)!,
      focusColor: Color.lerp(a.focusColor, b.focusColor, t)!,
      hoverColor: Color.lerp(a.hoverColor, b.hoverColor, t)!,
      shadowColor: Color.lerp(a.shadowColor, b.shadowColor, t)!,
      canvasColor: Color.lerp(a.canvasColor, b.canvasColor, t)!,
      scaffoldBackgroundColor: Color.lerp(a.scaffoldBackgroundColor, b.scaffoldBackgroundColor, t)!,
      bottomAppBarColor: Color.lerp(a.bottomAppBarColor, b.bottomAppBarColor, t)!,
      cardColor: Color.lerp(a.cardColor, b.cardColor, t)!,
      dividerColor: Color.lerp(a.dividerColor, b.dividerColor, t)!,
      highlightColor: Color.lerp(a.highlightColor, b.highlightColor, t)!,
      splashColor: Color.lerp(a.splashColor, b.splashColor, t)!,
      selectedRowColor: Color.lerp(a.selectedRowColor, b.selectedRowColor, t)!,
      unselectedWidgetColor: Color.lerp(a.unselectedWidgetColor, b.unselectedWidgetColor, t)!,
      disabledColor: Color.lerp(a.disabledColor, b.disabledColor, t)!,
      secondaryHeaderColor: Color.lerp(a.secondaryHeaderColor, b.secondaryHeaderColor, t)!,
      backgroundColor: Color.lerp(a.backgroundColor, b.backgroundColor, t)!,
      dialogBackgroundColor: Color.lerp(a.dialogBackgroundColor, b.dialogBackgroundColor, t)!,
      indicatorColor: Color.lerp(a.indicatorColor, b.indicatorColor, t)!,
      hintColor: Color.lerp(a.hintColor, b.hintColor, t)!,
      errorColor: Color.lerp(a.errorColor, b.errorColor, t)!,
      toggleableActiveColor: Color.lerp(a.toggleableActiveColor, b.toggleableActiveColor, t)!,
      // TYPOGRAPHY & ICONOGRAPHY
      typography: Typography.lerp(a.typography, b.typography, t),
      textTheme: TextTheme.lerp(a.textTheme, b.textTheme, t),
      primaryTextTheme: TextTheme.lerp(a.primaryTextTheme, b.primaryTextTheme, t),
      iconTheme: IconThemeData.lerp(a.iconTheme, b.iconTheme, t),
      primaryIconTheme: IconThemeData.lerp(a.primaryIconTheme, b.primaryIconTheme, t),
      // COMPONENT THEMES
      appBarTheme: AppBarTheme.lerp(a.appBarTheme, b.appBarTheme, t),
      bannerTheme: MaterialBannerThemeData.lerp(a.bannerTheme, b.bannerTheme, t),
      bottomAppBarTheme: BottomAppBarTheme.lerp(a.bottomAppBarTheme, b.bottomAppBarTheme, t),
      bottomNavigationBarTheme: BottomNavigationBarThemeData.lerp(a.bottomNavigationBarTheme, b.bottomNavigationBarTheme, t),
      bottomSheetTheme: BottomSheetThemeData.lerp(a.bottomSheetTheme, b.bottomSheetTheme, t)!,
      buttonBarTheme: ButtonBarThemeData.lerp(a.buttonBarTheme, b.buttonBarTheme, t)!,
      buttonTheme: t < 0.5 ? a.buttonTheme : b.buttonTheme,
      cardTheme: CardTheme.lerp(a.cardTheme, b.cardTheme, t),
      checkboxTheme: CheckboxThemeData.lerp(a.checkboxTheme, b.checkboxTheme, t),
      chipTheme: ChipThemeData.lerp(a.chipTheme, b.chipTheme, t)!,
      dataTableTheme: DataTableThemeData.lerp(a.dataTableTheme, b.dataTableTheme, t),
      dialogTheme: DialogTheme.lerp(a.dialogTheme, b.dialogTheme, t),
      dividerTheme: DividerThemeData.lerp(a.dividerTheme, b.dividerTheme, t),
      drawerTheme: DrawerThemeData.lerp(a.drawerTheme, b.drawerTheme, t)!,
      elevatedButtonTheme: ElevatedButtonThemeData.lerp(a.elevatedButtonTheme, b.elevatedButtonTheme, t)!,
      floatingActionButtonTheme: FloatingActionButtonThemeData.lerp(a.floatingActionButtonTheme, b.floatingActionButtonTheme, t)!,
      listTileTheme: ListTileThemeData.lerp(a.listTileTheme, b.listTileTheme, t)!,
      navigationBarTheme: NavigationBarThemeData.lerp(a.navigationBarTheme, b.navigationBarTheme, t)!,
      navigationRailTheme: NavigationRailThemeData.lerp(a.navigationRailTheme, b.navigationRailTheme, t)!,
      outlinedButtonTheme: OutlinedButtonThemeData.lerp(a.outlinedButtonTheme, b.outlinedButtonTheme, t)!,
      popupMenuTheme: PopupMenuThemeData.lerp(a.popupMenuTheme, b.popupMenuTheme, t)!,
      progressIndicatorTheme: ProgressIndicatorThemeData.lerp(a.progressIndicatorTheme, b.progressIndicatorTheme, t)!,
      radioTheme: RadioThemeData.lerp(a.radioTheme, b.radioTheme, t),
      sliderTheme: SliderThemeData.lerp(a.sliderTheme, b.sliderTheme, t),
      snackBarTheme: SnackBarThemeData.lerp(a.snackBarTheme, b.snackBarTheme, t),
      switchTheme: SwitchThemeData.lerp(a.switchTheme, b.switchTheme, t),
      tabBarTheme: TabBarTheme.lerp(a.tabBarTheme, b.tabBarTheme, t),
      textButtonTheme: TextButtonThemeData.lerp(a.textButtonTheme, b.textButtonTheme, t)!,
      textSelectionTheme: TextSelectionThemeData.lerp(a.textSelectionTheme, b.textSelectionTheme, t)!,
      timePickerTheme: TimePickerThemeData.lerp(a.timePickerTheme, b.timePickerTheme, t),
      toggleButtonsTheme: ToggleButtonsThemeData.lerp(a.toggleButtonsTheme, b.toggleButtonsTheme, t)!,
      tooltipTheme: TooltipThemeData.lerp(a.tooltipTheme, b.tooltipTheme, t)!,
      expansionTileTheme: ExpansionTileThemeData.lerp(a.expansionTileTheme, b.expansionTileTheme, t)!,
      // DEPRECATED (newest deprecations at the bottom)
      useTextSelectionTheme: t < 0.5 ? a.useTextSelectionTheme : b.useTextSelectionTheme,
      textSelectionColor: Color.lerp(a.textSelectionColor, b.textSelectionColor, t)!,
      cursorColor: Color.lerp(a.cursorColor, b.cursorColor, t)!,
      textSelectionHandleColor: Color.lerp(a.textSelectionHandleColor, b.textSelectionHandleColor, t)!,
      accentColor: Color.lerp(a.accentColor, b.accentColor, t)!,
      accentColorBrightness: t < 0.5 ? a.accentColorBrightness : b.accentColorBrightness,
      accentTextTheme: TextTheme.lerp(a.accentTextTheme, b.accentTextTheme, t),
      accentIconTheme: IconThemeData.lerp(a.accentIconTheme, b.accentIconTheme, t),
      buttonColor: Color.lerp(a.buttonColor, b.buttonColor, t)!,
      fixTextFieldOutlineLabel: t < 0.5 ? a.fixTextFieldOutlineLabel : b.fixTextFieldOutlineLabel,
      primaryColorBrightness: t < 0.5 ? a.primaryColorBrightness : b.primaryColorBrightness,
      androidOverscrollIndicator:t < 0.5 ? a.androidOverscrollIndicator : b.androidOverscrollIndicator,
    );
  }

  @override
  bool operator ==(Object other) {
    if (other.runtimeType != runtimeType)
      return false;
    // Warning: make sure these properties are in the exact same order as in
    // Object.hash() and in the raw constructor and in the order of fields in
    // the class and in the lerp() method.
    return other is ThemeData &&
        // GENERAL CONFIGURATION
        other.applyElevationOverlayColor == applyElevationOverlayColor &&
        other.cupertinoOverrideTheme == cupertinoOverrideTheme &&
        mapEquals(other.extensions, extensions) &&
        other.inputDecorationTheme == inputDecorationTheme &&
        other.materialTapTargetSize == materialTapTargetSize &&
        other.pageTransitionsTheme == pageTransitionsTheme &&
        other.platform == platform &&
        other.scrollbarTheme == scrollbarTheme &&
        other.splashFactory == splashFactory &&
        other.visualDensity == visualDensity &&
        other.useMaterial3 == useMaterial3 &&
        // COLOR
        other.colorScheme == colorScheme &&
        other.primaryColor == primaryColor &&
        other.primaryColorLight == primaryColorLight &&
        other.primaryColorDark == primaryColorDark &&
        other.focusColor == focusColor &&
        other.hoverColor == hoverColor &&
        other.shadowColor == shadowColor &&
        other.canvasColor == canvasColor &&
        other.scaffoldBackgroundColor == scaffoldBackgroundColor &&
        other.bottomAppBarColor == bottomAppBarColor &&
        other.cardColor == cardColor &&
        other.dividerColor == dividerColor &&
        other.highlightColor == highlightColor &&
        other.splashColor == splashColor &&
        other.selectedRowColor == selectedRowColor &&
        other.unselectedWidgetColor == unselectedWidgetColor &&
        other.disabledColor == disabledColor &&
        other.secondaryHeaderColor == secondaryHeaderColor &&
        other.backgroundColor == backgroundColor &&
        other.dialogBackgroundColor == dialogBackgroundColor &&
        other.indicatorColor == indicatorColor &&
        other.hintColor == hintColor &&
        other.errorColor == errorColor &&
        other.toggleableActiveColor == toggleableActiveColor &&
        // TYPOGRAPHY & ICONOGRAPHY
        other.typography == typography &&
        other.textTheme == textTheme &&
        other.primaryTextTheme == primaryTextTheme &&
        other.iconTheme == iconTheme &&
        other.primaryIconTheme == primaryIconTheme &&
        // COMPONENT THEMES
        other.appBarTheme == appBarTheme &&
        other.bannerTheme == bannerTheme &&
        other.bottomAppBarTheme == bottomAppBarTheme &&
        other.bottomNavigationBarTheme == bottomNavigationBarTheme &&
        other.bottomSheetTheme == bottomSheetTheme &&
        other.buttonBarTheme == buttonBarTheme &&
        other.buttonTheme == buttonTheme &&
        other.cardTheme == cardTheme &&
        other.checkboxTheme == checkboxTheme &&
        other.chipTheme == chipTheme &&
        other.dataTableTheme == dataTableTheme &&
        other.dialogTheme == dialogTheme &&
        other.dividerTheme == dividerTheme &&
        other.drawerTheme == drawerTheme &&
        other.elevatedButtonTheme == elevatedButtonTheme &&
        other.floatingActionButtonTheme == floatingActionButtonTheme &&
        other.listTileTheme == listTileTheme &&
        other.navigationBarTheme == navigationBarTheme &&
        other.navigationRailTheme == navigationRailTheme &&
        other.outlinedButtonTheme == outlinedButtonTheme &&
        other.popupMenuTheme == popupMenuTheme &&
        other.progressIndicatorTheme == progressIndicatorTheme &&
        other.radioTheme == radioTheme &&
        other.sliderTheme == sliderTheme &&
        other.snackBarTheme == snackBarTheme &&
        other.switchTheme == switchTheme &&
        other.tabBarTheme == tabBarTheme &&
        other.textButtonTheme == textButtonTheme &&
        other.textSelectionTheme == textSelectionTheme &&
        other.timePickerTheme == timePickerTheme &&
        other.toggleButtonsTheme == toggleButtonsTheme &&
        other.tooltipTheme == tooltipTheme &&
        other.expansionTileTheme == expansionTileTheme &&
        // DEPRECATED (newest deprecations at the bottom)
        other.useTextSelectionTheme == useTextSelectionTheme &&
        other.textSelectionColor == textSelectionColor &&
        other.cursorColor == cursorColor &&
        other.textSelectionHandleColor == textSelectionHandleColor &&
        other.accentColor == accentColor &&
        other.accentColorBrightness == accentColorBrightness &&
        other.accentTextTheme == accentTextTheme &&
        other.accentIconTheme == accentIconTheme &&
        other.buttonColor == buttonColor &&
        other.fixTextFieldOutlineLabel == fixTextFieldOutlineLabel &&
        other.primaryColorBrightness == primaryColorBrightness &&
        other.androidOverscrollIndicator == androidOverscrollIndicator;
  }

  @override
  int get hashCode {
    // Warning: For the sanity of the reader, please make sure these properties
    // are in the exact same order as in operator == and in the raw constructor
    // and in the order of fields in the class and in the lerp() method.
    final List<Object?> values = <Object?>[
      // GENERAL CONFIGURATION
      applyElevationOverlayColor,
      cupertinoOverrideTheme,
      hashList(extensions.keys),
      hashList(extensions.values),
      inputDecorationTheme,
      materialTapTargetSize,
      pageTransitionsTheme,
      platform,
      scrollbarTheme,
      splashFactory,
      visualDensity,
      useMaterial3,
      // COLOR
      colorScheme,
      primaryColor,
      primaryColorLight,
      primaryColorDark,
      focusColor,
      hoverColor,
      shadowColor,
      canvasColor,
      scaffoldBackgroundColor,
      bottomAppBarColor,
      cardColor,
      dividerColor,
      highlightColor,
      splashColor,
      selectedRowColor,
      unselectedWidgetColor,
      disabledColor,
      secondaryHeaderColor,
      backgroundColor,
      dialogBackgroundColor,
      indicatorColor,
      hintColor,
      errorColor,
      toggleableActiveColor,
      // TYPOGRAPHY & ICONOGRAPHY
      typography,
      textTheme,
      primaryTextTheme,
      iconTheme,
      primaryIconTheme,
      // COMPONENT THEMES
      appBarTheme,
      bannerTheme,
      bottomAppBarTheme,
      bottomNavigationBarTheme,
      bottomSheetTheme,
      buttonBarTheme,
      buttonTheme,
      cardTheme,
      checkboxTheme,
      chipTheme,
      dataTableTheme,
      dialogTheme,
      dividerTheme,
      drawerTheme,
      elevatedButtonTheme,
      floatingActionButtonTheme,
      listTileTheme,
      navigationBarTheme,
      navigationRailTheme,
      outlinedButtonTheme,
      popupMenuTheme,
      progressIndicatorTheme,
      radioTheme,
      sliderTheme,
      snackBarTheme,
      switchTheme,
      tabBarTheme,
      textButtonTheme,
      textSelectionTheme,
      timePickerTheme,
      toggleButtonsTheme,
      tooltipTheme,
      expansionTileTheme,
      // DEPRECATED (newest deprecations at the bottom)
      useTextSelectionTheme,
      textSelectionColor,
      cursorColor,
      textSelectionHandleColor,
      accentColor,
      accentColorBrightness,
      accentTextTheme,
      accentIconTheme,
      buttonColor,
      fixTextFieldOutlineLabel,
      primaryColorBrightness,
      androidOverscrollIndicator,
    ];
    return Object.hashAll(values);
  }

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    final ThemeData defaultData = ThemeData.fallback();
    // GENERAL CONFIGURATION
    properties.add(DiagnosticsProperty<bool>('applyElevationOverlayColor', applyElevationOverlayColor, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<NoDefaultCupertinoThemeData>('cupertinoOverrideTheme', cupertinoOverrideTheme, defaultValue: defaultData.cupertinoOverrideTheme, level: DiagnosticLevel.debug));
    properties.add(IterableProperty<ThemeExtension<dynamic>>('extensions', extensions.values, defaultValue: defaultData.extensions.values, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<InputDecorationTheme>('inputDecorationTheme', inputDecorationTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<MaterialTapTargetSize>('materialTapTargetSize', materialTapTargetSize, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<PageTransitionsTheme>('pageTransitionsTheme', pageTransitionsTheme, level: DiagnosticLevel.debug));
    properties.add(EnumProperty<TargetPlatform>('platform', platform, defaultValue: defaultTargetPlatform, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ScrollbarThemeData>('scrollbarTheme', scrollbarTheme, defaultValue: defaultData.scrollbarTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<InteractiveInkFeatureFactory>('splashFactory', splashFactory, defaultValue: defaultData.splashFactory, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<VisualDensity>('visualDensity', visualDensity, defaultValue: defaultData.visualDensity, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<bool>('useMaterial3', useMaterial3, defaultValue: defaultData.useMaterial3, level: DiagnosticLevel.debug));
    // COLORS
    properties.add(DiagnosticsProperty<ColorScheme>('colorScheme', colorScheme, defaultValue: defaultData.colorScheme, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('primaryColor', primaryColor, defaultValue: defaultData.primaryColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('primaryColorLight', primaryColorLight, defaultValue: defaultData.primaryColorLight, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('primaryColorDark', primaryColorDark, defaultValue: defaultData.primaryColorDark, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('focusColor', focusColor, defaultValue: defaultData.focusColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('hoverColor', hoverColor, defaultValue: defaultData.hoverColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('shadowColor', shadowColor, defaultValue: defaultData.shadowColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('canvasColor', canvasColor, defaultValue: defaultData.canvasColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('scaffoldBackgroundColor', scaffoldBackgroundColor, defaultValue: defaultData.scaffoldBackgroundColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('bottomAppBarColor', bottomAppBarColor, defaultValue: defaultData.bottomAppBarColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('cardColor', cardColor, defaultValue: defaultData.cardColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('dividerColor', dividerColor, defaultValue: defaultData.dividerColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('highlightColor', highlightColor, defaultValue: defaultData.highlightColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('splashColor', splashColor, defaultValue: defaultData.splashColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('selectedRowColor', selectedRowColor, defaultValue: defaultData.selectedRowColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('unselectedWidgetColor', unselectedWidgetColor, defaultValue: defaultData.unselectedWidgetColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('disabledColor', disabledColor, defaultValue: defaultData.disabledColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('secondaryHeaderColor', secondaryHeaderColor, defaultValue: defaultData.secondaryHeaderColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('backgroundColor', backgroundColor, defaultValue: defaultData.backgroundColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('dialogBackgroundColor', dialogBackgroundColor, defaultValue: defaultData.dialogBackgroundColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('indicatorColor', indicatorColor, defaultValue: defaultData.indicatorColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('hintColor', hintColor, defaultValue: defaultData.hintColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('errorColor', errorColor, defaultValue: defaultData.errorColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('toggleableActiveColor', toggleableActiveColor, defaultValue: defaultData.toggleableActiveColor, level: DiagnosticLevel.debug));
    // TYPOGRAPHY & ICONOGRAPHY
    properties.add(DiagnosticsProperty<Typography>('typography', typography, defaultValue: defaultData.typography, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<TextTheme>('textTheme', textTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<TextTheme>('primaryTextTheme', primaryTextTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<IconThemeData>('iconTheme', iconTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<IconThemeData>('primaryIconTheme', primaryIconTheme, level: DiagnosticLevel.debug));
    // COMPONENT THEMES
    properties.add(DiagnosticsProperty<AppBarTheme>('appBarTheme', appBarTheme, defaultValue: defaultData.appBarTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<MaterialBannerThemeData>('bannerTheme', bannerTheme, defaultValue: defaultData.bannerTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<BottomAppBarTheme>('bottomAppBarTheme', bottomAppBarTheme, defaultValue: defaultData.bottomAppBarTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<BottomNavigationBarThemeData>('bottomNavigationBarTheme', bottomNavigationBarTheme, defaultValue: defaultData.bottomNavigationBarTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<BottomSheetThemeData>('bottomSheetTheme', bottomSheetTheme, defaultValue: defaultData.bottomSheetTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ButtonBarThemeData>('buttonBarTheme', buttonBarTheme, defaultValue: defaultData.buttonBarTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ButtonThemeData>('buttonTheme', buttonTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<CardTheme>('cardTheme', cardTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<CheckboxThemeData>('checkboxTheme', checkboxTheme, defaultValue: defaultData.checkboxTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ChipThemeData>('chipTheme', chipTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<DataTableThemeData>('dataTableTheme', dataTableTheme, defaultValue: defaultData.dataTableTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<DialogTheme>('dialogTheme', dialogTheme, defaultValue: defaultData.dialogTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<DividerThemeData>('dividerTheme', dividerTheme, defaultValue: defaultData.dividerTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<DrawerThemeData>('drawerTheme', drawerTheme, defaultValue: defaultData.drawerTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ElevatedButtonThemeData>('elevatedButtonTheme', elevatedButtonTheme, defaultValue: defaultData.elevatedButtonTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<FloatingActionButtonThemeData>('floatingActionButtonTheme', floatingActionButtonTheme, defaultValue: defaultData.floatingActionButtonTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ListTileThemeData>('listTileTheme', listTileTheme, defaultValue: defaultData.listTileTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<NavigationBarThemeData>('navigationBarTheme', navigationBarTheme, defaultValue: defaultData.navigationBarTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<NavigationRailThemeData>('navigationRailTheme', navigationRailTheme, defaultValue: defaultData.navigationRailTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<OutlinedButtonThemeData>('outlinedButtonTheme', outlinedButtonTheme, defaultValue: defaultData.outlinedButtonTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<PopupMenuThemeData>('popupMenuTheme', popupMenuTheme, defaultValue: defaultData.popupMenuTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ProgressIndicatorThemeData>('progressIndicatorTheme', progressIndicatorTheme, defaultValue: defaultData.progressIndicatorTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<RadioThemeData>('radioTheme', radioTheme, defaultValue: defaultData.radioTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<SliderThemeData>('sliderTheme', sliderTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<SnackBarThemeData>('snackBarTheme', snackBarTheme, defaultValue: defaultData.snackBarTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<SwitchThemeData>('switchTheme', switchTheme, defaultValue: defaultData.switchTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<TabBarTheme>('tabBarTheme', tabBarTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<TextButtonThemeData>('textButtonTheme', textButtonTheme, defaultValue: defaultData.textButtonTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<TextSelectionThemeData>('textSelectionTheme', textSelectionTheme, defaultValue: defaultData.textSelectionTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<TimePickerThemeData>('timePickerTheme', timePickerTheme, defaultValue: defaultData.timePickerTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ToggleButtonsThemeData>('toggleButtonsTheme', toggleButtonsTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<TooltipThemeData>('tooltipTheme', tooltipTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<ExpansionTileThemeData>('expansionTileTheme', expansionTileTheme, level: DiagnosticLevel.debug));
    // DEPRECATED (newest deprecations at the bottom)
    properties.add(DiagnosticsProperty<bool>('useTextSelectionTheme', useTextSelectionTheme, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('textSelectionColor', textSelectionColor, defaultValue: defaultData.textSelectionColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('cursorColor', cursorColor, defaultValue: defaultData.cursorColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('textSelectionHandleColor', textSelectionHandleColor, defaultValue: defaultData.textSelectionHandleColor, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('accentColor', accentColor, defaultValue: defaultData.accentColor, level: DiagnosticLevel.debug));
    properties.add(EnumProperty<Brightness>('accentColorBrightness', accentColorBrightness, defaultValue: defaultData.accentColorBrightness, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<TextTheme>('accentTextTheme', accentTextTheme, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<IconThemeData>('accentIconTheme', accentIconTheme, level: DiagnosticLevel.debug));
    properties.add(ColorProperty('buttonColor', buttonColor, defaultValue: defaultData.buttonColor, level: DiagnosticLevel.debug));
    properties.add(DiagnosticsProperty<bool>('fixTextFieldOutlineLabel', fixTextFieldOutlineLabel, level: DiagnosticLevel.debug));
    properties.add(EnumProperty<Brightness>('primaryColorBrightness', primaryColorBrightness, defaultValue: defaultData.primaryColorBrightness, level: DiagnosticLevel.debug));
    properties.add(EnumProperty<AndroidOverscrollIndicator>('androidOverscrollIndicator', androidOverscrollIndicator, defaultValue: null, level: DiagnosticLevel.debug));
  }
}

/// A [CupertinoThemeData] that defers unspecified theme attributes to an
/// upstream Material [ThemeData].
///
/// This type of [CupertinoThemeData] is used by the Material [Theme] to
/// harmonize the [CupertinoTheme] with the material theme's colors and text
/// styles.
///
/// In the most basic case, [ThemeData]'s `cupertinoOverrideTheme` is null and
/// and descendant Cupertino widgets' styling is derived from the Material theme.
///
/// To override individual parts of the Material-derived Cupertino styling,
/// `cupertinoOverrideTheme`'s construction parameters can be used.
///
/// To completely decouple the Cupertino styling from Material theme derivation,
/// another [CupertinoTheme] widget can be inserted as a descendant of the
/// Material [Theme]. On a [MaterialApp], this can be done using the `builder`
/// parameter on the constructor.
///
/// See also:
///
///  * [CupertinoThemeData], whose null constructor parameters default to
///    reasonable iOS styling defaults rather than harmonizing with a Material
///    theme.
///  * [Theme], widget which inserts a [CupertinoTheme] with this
///    [MaterialBasedCupertinoThemeData].
// This class subclasses CupertinoThemeData rather than composes one because it
// _is_ a CupertinoThemeData with partially altered behavior. e.g. its textTheme
// is from the superclass and based on the primaryColor but the primaryColor
// comes from the Material theme unless overridden.
class MaterialBasedCupertinoThemeData extends CupertinoThemeData {
  /// Create a [MaterialBasedCupertinoThemeData] based on a Material [ThemeData]
  /// and its `cupertinoOverrideTheme`.
  ///
  /// The [materialTheme] parameter must not be null.
  MaterialBasedCupertinoThemeData({
    required ThemeData materialTheme,
  }) : this._(
    materialTheme,
    (materialTheme.cupertinoOverrideTheme ?? const CupertinoThemeData()).noDefault(),
  );

  MaterialBasedCupertinoThemeData._(
    this._materialTheme,
    this._cupertinoOverrideTheme,
  ) : assert(_materialTheme != null),
      assert(_cupertinoOverrideTheme != null),
      // Pass all values to the superclass so Material-agnostic properties
      // like barBackgroundColor can still behave like a normal
      // CupertinoThemeData.
      super.raw(
        _cupertinoOverrideTheme.brightness,
        _cupertinoOverrideTheme.primaryColor,
        _cupertinoOverrideTheme.primaryContrastingColor,
        _cupertinoOverrideTheme.textTheme,
        _cupertinoOverrideTheme.barBackgroundColor,
        _cupertinoOverrideTheme.scaffoldBackgroundColor,
      );

  final ThemeData _materialTheme;
  final NoDefaultCupertinoThemeData _cupertinoOverrideTheme;

  @override
  Brightness get brightness => _cupertinoOverrideTheme.brightness ?? _materialTheme.brightness;

  @override
  Color get primaryColor => _cupertinoOverrideTheme.primaryColor ?? _materialTheme.colorScheme.primary;

  @override
  Color get primaryContrastingColor => _cupertinoOverrideTheme.primaryContrastingColor ?? _materialTheme.colorScheme.onPrimary;

  @override
  Color get scaffoldBackgroundColor => _cupertinoOverrideTheme.scaffoldBackgroundColor ?? _materialTheme.scaffoldBackgroundColor;

  /// Copies the [ThemeData]'s `cupertinoOverrideTheme`.
  ///
  /// Only the specified override attributes of the [ThemeData]'s
  /// `cupertinoOverrideTheme` and the newly specified parameters are in the
  /// returned [CupertinoThemeData]. No derived attributes from iOS defaults or
  /// from cascaded Material theme attributes are copied.
  ///
  /// [MaterialBasedCupertinoThemeData.copyWith] cannot change the base
  /// Material [ThemeData]. To change the base Material [ThemeData], create a
  /// new Material [Theme] and use `copyWith` on the Material [ThemeData]
  /// instead.
  @override
  MaterialBasedCupertinoThemeData copyWith({
    Brightness? brightness,
    Color? primaryColor,
    Color? primaryContrastingColor,
    CupertinoTextThemeData? textTheme,
    Color? barBackgroundColor,
    Color? scaffoldBackgroundColor,
  }) {
    return MaterialBasedCupertinoThemeData._(
      _materialTheme,
      _cupertinoOverrideTheme.copyWith(
        brightness: brightness,
        primaryColor: primaryColor,
        primaryContrastingColor: primaryContrastingColor,
        textTheme: textTheme,
        barBackgroundColor: barBackgroundColor,
        scaffoldBackgroundColor: scaffoldBackgroundColor,
      ),
    );
  }

  @override
  CupertinoThemeData resolveFrom(BuildContext context) {
    // Only the cupertino override theme part will be resolved.
    // If the color comes from the material theme it's not resolved.
    return MaterialBasedCupertinoThemeData._(
      _materialTheme,
      _cupertinoOverrideTheme.resolveFrom(context),
    );
  }
}

@immutable
class _IdentityThemeDataCacheKey {
  const _IdentityThemeDataCacheKey(this.baseTheme, this.localTextGeometry);

  final ThemeData baseTheme;
  final TextTheme localTextGeometry;

  // Using XOR to make the hash function as fast as possible (e.g. Jenkins is
  // noticeably slower).
  @override
  int get hashCode => identityHashCode(baseTheme) ^ identityHashCode(localTextGeometry);

  @override
  bool operator ==(Object other) {
    // We are explicitly ignoring the possibility that the types might not
    // match in the interests of speed.
    return other is _IdentityThemeDataCacheKey
        && identical(other.baseTheme, baseTheme)
        && identical(other.localTextGeometry, localTextGeometry);
  }
}

/// Cache of objects of limited size that uses the first in first out eviction
/// strategy (a.k.a least recently inserted).
///
/// The key that was inserted before all other keys is evicted first, i.e. the
/// one inserted least recently.
class _FifoCache<K, V> {
  _FifoCache(this._maximumSize) : assert(_maximumSize != null && _maximumSize > 0);

  /// In Dart the map literal uses a linked hash-map implementation, whose keys
  /// are stored such that [Map.keys] returns them in the order they were
  /// inserted.
  final Map<K, V> _cache = <K, V>{};

  /// Maximum number of entries to store in the cache.
  ///
  /// Once this many entries have been cached, the entry inserted least recently
  /// is evicted when adding a new entry.
  final int _maximumSize;

  /// Returns the previously cached value for the given key, if available;
  /// if not, calls the given callback to obtain it first.
  ///
  /// The arguments must not be null.
  V putIfAbsent(K key, V Function() loader) {
    assert(key != null);
    assert(loader != null);
    final V? result = _cache[key];
    if (result != null)
      return result;
    if (_cache.length == _maximumSize)
      _cache.remove(_cache.keys.first);
    return _cache[key] = loader();
  }
}

/// Defines the visual density of user interface components.
///
/// Density, in the context of a UI, is the vertical and horizontal
/// "compactness" of the components in the UI. It is unitless, since it means
/// different things to different UI components.
///
/// The default for visual densities is zero for both vertical and horizontal
/// densities, which corresponds to the default visual density of components in
/// the Material Design specification. It does not affect text sizes, icon
/// sizes, or padding values.
///
/// For example, for buttons, it affects the spacing around the child of the
/// button. For lists, it affects the distance between baselines of entries in
/// the list. For chips, it only affects the vertical size, not the horizontal
/// size.
///
/// Here are some examples of widgets that respond to density changes:
///
///  * [Checkbox]
///  * [Chip]
///  * [ElevatedButton]
///  * [FlatButton]
///  * [IconButton]
///  * [InputDecorator] (which gives density support to [TextField], etc.)
///  * [ListTile]
///  * [MaterialButton]
///  * [OutlinedButton]
///  * [Radio]
///  * [RawMaterialButton]
///  * [TextButton]
///
/// See also:
///
///  * [ThemeData.visualDensity], where this property is used to specify the base
///    horizontal density of Material components.
///  * [Material design guidance on density](https://material.io/design/layout/applying-density.html).
@immutable
class VisualDensity with Diagnosticable {
  /// A const constructor for [VisualDensity].
  ///
  /// All of the arguments must be non-null, and [horizontal] and [vertical]
  /// must be in the interval between [minimumDensity] and [maximumDensity],
  /// inclusive.
  const VisualDensity({
    this.horizontal = 0.0,
    this.vertical = 0.0,
  }) : assert(horizontal != null),
       assert(vertical != null),
       assert(vertical <= maximumDensity),
       assert(vertical <= maximumDensity),
       assert(vertical >= minimumDensity),
       assert(horizontal <= maximumDensity),
       assert(horizontal >= minimumDensity);

  /// The minimum allowed density.
  static const double minimumDensity = -4.0;

  /// The maximum allowed density.
  static const double maximumDensity = 4.0;

  /// The default profile for [VisualDensity] in [ThemeData].
  ///
  /// This default value represents a visual density that is less dense than
  /// either [comfortable] or [compact], and corresponds to density values of
  /// zero in both axes.
  static const VisualDensity standard = VisualDensity();

  /// The profile for a "comfortable" interpretation of [VisualDensity].
  ///
  /// Individual components will interpret the density value independently,
  /// making themselves more visually dense than [standard] and less dense than
  /// [compact] to different degrees based on the Material Design specification
  /// of the "comfortable" setting for their particular use case.
  ///
  /// It corresponds to a density value of -1 in both axes.
  static const VisualDensity comfortable = VisualDensity(horizontal: -1.0, vertical: -1.0);

  /// The profile for a "compact" interpretation of [VisualDensity].
  ///
  /// Individual components will interpret the density value independently,
  /// making themselves more visually dense than [standard] and [comfortable] to
  /// different degrees based on the Material Design specification of the
  /// "comfortable" setting for their particular use case.
  ///
  /// It corresponds to a density value of -2 in both axes.
  static const VisualDensity compact = VisualDensity(horizontal: -2.0, vertical: -2.0);

  /// Returns a visual density that is adaptive based on the [defaultTargetPlatform].
  ///
  /// For desktop platforms, this returns [compact], and for other platforms,
  /// it returns a default-constructed [VisualDensity].
  static VisualDensity get adaptivePlatformDensity {
    switch (defaultTargetPlatform) {
      case TargetPlatform.android:
      case TargetPlatform.iOS:
      case TargetPlatform.fuchsia:
        break;
      case TargetPlatform.linux:
      case TargetPlatform.macOS:
      case TargetPlatform.windows:
        return compact;
    }
    return VisualDensity.standard;
  }

  /// Copy the current [VisualDensity] with the given values replacing the
  /// current values.
  VisualDensity copyWith({
    double? horizontal,
    double? vertical,
  }) {
    return VisualDensity(
      horizontal: horizontal ?? this.horizontal,
      vertical: vertical ?? this.vertical,
    );
  }

  /// The horizontal visual density of UI components.
  ///
  /// This property affects only the horizontal spacing between and within
  /// components, to allow for different UI visual densities. It does not affect
  /// text sizes, icon sizes, or padding values. The default value is 0.0,
  /// corresponding to the metrics specified in the Material Design
  /// specification. The value can range from [minimumDensity] to
  /// [maximumDensity], inclusive.
  ///
  /// See also:
  ///
  ///  * [ThemeData.visualDensity], where this property is used to specify the base
  ///    horizontal density of Material components.
  ///  * [Material design guidance on density](https://material.io/design/layout/applying-density.html).
  final double horizontal;

  /// The vertical visual density of UI components.
  ///
  /// This property affects only the vertical spacing between and within
  /// components, to allow for different UI visual densities. It does not affect
  /// text sizes, icon sizes, or padding values. The default value is 0.0,
  /// corresponding to the metrics specified in the Material Design
  /// specification. The value can range from [minimumDensity] to
  /// [maximumDensity], inclusive.
  ///
  /// See also:
  ///
  ///  * [ThemeData.visualDensity], where this property is used to specify the base
  ///    vertical density of Material components.
  ///  * [Material design guidance on density](https://material.io/design/layout/applying-density.html).
  final double vertical;

  /// The base adjustment in logical pixels of the visual density of UI components.
  ///
  /// The input density values are multiplied by a constant to arrive at a base
  /// size adjustment that fits material design guidelines.
  ///
  /// Individual components may adjust this value based upon their own
  /// individual interpretation of density.
  Offset get baseSizeAdjustment {
    // The number of logical pixels represented by an increase or decrease in
    // density by one. The Material Design guidelines say to increment/decrement
    // sized in terms of four pixel increments.
    const double interval = 4.0;

    return Offset(horizontal, vertical) * interval;
  }

  /// Linearly interpolate between two densities.
  static VisualDensity lerp(VisualDensity a, VisualDensity b, double t) {
    return VisualDensity(
      horizontal: lerpDouble(a.horizontal, b.horizontal, t)!,
      vertical: lerpDouble(a.vertical, b.vertical, t)!,
    );
  }

  /// Return a copy of [constraints] whose minimum width and height have been
  /// updated with the [baseSizeAdjustment].
  ///
  /// The resulting minWidth and minHeight values are clamped to not exceed the
  /// maxWidth and maxHeight values, respectively.
  BoxConstraints effectiveConstraints(BoxConstraints constraints) {
    assert(constraints != null && constraints.debugAssertIsValid());
    return constraints.copyWith(
      minWidth: (constraints.minWidth + baseSizeAdjustment.dx).clamp(0.0, constraints.maxWidth),
      minHeight: (constraints.minHeight + baseSizeAdjustment.dy).clamp(0.0, constraints.maxHeight),
    );
  }

  @override
  bool operator ==(Object other) {
    if (other.runtimeType != runtimeType) {
      return false;
    }
    return other is VisualDensity
        && other.horizontal == horizontal
        && other.vertical == vertical;
  }

  @override
  int get hashCode => Object.hash(horizontal, vertical);

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(DoubleProperty('horizontal', horizontal, defaultValue: 0.0));
    properties.add(DoubleProperty('vertical', vertical, defaultValue: 0.0));
  }

  @override
  String toStringShort() {
    return '${super.toStringShort()}(h: ${debugFormatDouble(horizontal)}, v: ${debugFormatDouble(vertical)})';
  }
}
