// 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.

// @dart = 2.8

import 'dart:ui' as ui;
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/src/foundation/diagnostics.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  const TextTheme defaultGeometryTheme = Typography.englishLike2014;

  test('ThemeDataTween control test', () {
    final ThemeData light = ThemeData.light();
    final ThemeData dark = ThemeData.dark();
    final ThemeDataTween tween = ThemeDataTween(begin: light, end: dark);
    expect(tween.lerp(0.25), equals(ThemeData.lerp(light, dark, 0.25)));
  });

  testWidgets('PopupMenu inherits app theme', (WidgetTester tester) async {
    final Key popupMenuButtonKey = UniqueKey();
    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(brightness: Brightness.dark),
        home: Scaffold(
          appBar: AppBar(
            actions: <Widget>[
              PopupMenuButton<String>(
                key: popupMenuButtonKey,
                itemBuilder: (BuildContext context) {
                  return <PopupMenuItem<String>>[
                    const PopupMenuItem<String>(child: Text('menuItem')),
                  ];
                },
              ),
            ],
          ),
        ),
      ),
    );

    await tester.tap(find.byKey(popupMenuButtonKey));
    await tester.pump(const Duration(seconds: 1));

    expect(Theme.of(tester.element(find.text('menuItem'))).brightness, equals(Brightness.dark));
  });

  testWidgets('Fallback theme', (WidgetTester tester) async {
    BuildContext capturedContext;
    await tester.pumpWidget(
      Builder(
        builder: (BuildContext context) {
          capturedContext = context;
          return Container();
        }
      )
    );

    expect(Theme.of(capturedContext), equals(ThemeData.localize(ThemeData.fallback(), defaultGeometryTheme)));
    expect(Theme.of(capturedContext, shadowThemeOnly: true), isNull);
  });

  testWidgets('ThemeData.localize memoizes the result', (WidgetTester tester) async {
    final ThemeData light = ThemeData.light();
    final ThemeData dark = ThemeData.dark();

    // Same input, same output.
    expect(
      ThemeData.localize(light, defaultGeometryTheme),
      same(ThemeData.localize(light, defaultGeometryTheme)),
    );

    // Different text geometry, different output.
    expect(
      ThemeData.localize(light, defaultGeometryTheme),
      isNot(same(ThemeData.localize(light, Typography.tall2014))),
    );

    // Different base theme, different output.
    expect(
      ThemeData.localize(light, defaultGeometryTheme),
      isNot(same(ThemeData.localize(dark, defaultGeometryTheme))),
    );
  });

  testWidgets('PopupMenu inherits shadowed app theme', (WidgetTester tester) async {
    // Regression test for https://github.com/flutter/flutter/issues/5572
    final Key popupMenuButtonKey = UniqueKey();
    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(brightness: Brightness.dark),
        home: Theme(
          data: ThemeData(brightness: Brightness.light),
          child: Scaffold(
            appBar: AppBar(
              actions: <Widget>[
                PopupMenuButton<String>(
                  key: popupMenuButtonKey,
                  itemBuilder: (BuildContext context) {
                    return <PopupMenuItem<String>>[
                      const PopupMenuItem<String>(child: Text('menuItem')),
                    ];
                  },
                ),
              ],
            ),
          ),
        ),
      ),
    );

    await tester.tap(find.byKey(popupMenuButtonKey));
    await tester.pump(const Duration(seconds: 1));

    expect(Theme.of(tester.element(find.text('menuItem'))).brightness, equals(Brightness.light));
  });

  testWidgets('DropdownMenu inherits shadowed app theme', (WidgetTester tester) async {
    final Key dropdownMenuButtonKey = UniqueKey();
    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(brightness: Brightness.dark),
        home: Theme(
          data: ThemeData(brightness: Brightness.light),
          child: Scaffold(
            appBar: AppBar(
              actions: <Widget>[
                DropdownButton<String>(
                  key: dropdownMenuButtonKey,
                  onChanged: (String newValue) { },
                  value: 'menuItem',
                  items: const <DropdownMenuItem<String>>[
                    DropdownMenuItem<String>(
                      value: 'menuItem',
                      child: Text('menuItem'),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );

    await tester.tap(find.byKey(dropdownMenuButtonKey));
    await tester.pump(const Duration(seconds: 1));

    for (final Element item in tester.elementList(find.text('menuItem')))
      expect(Theme.of(item).brightness, equals(Brightness.light));
  });

  testWidgets('ModalBottomSheet inherits shadowed app theme', (WidgetTester tester) async {
    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(brightness: Brightness.dark),
        home: Theme(
          data: ThemeData(brightness: Brightness.light),
          child: Scaffold(
            body: Center(
              child: Builder(
                builder: (BuildContext context) {
                  return ElevatedButton(
                    onPressed: () {
                      showModalBottomSheet<void>(
                        context: context,
                        builder: (BuildContext context) => const Text('bottomSheet'),
                      );
                    },
                    child: const Text('SHOW'),
                  );
                }
              ),
            ),
          ),
        ),
      ),
    );

    await tester.tap(find.text('SHOW'));
    await tester.pump(const Duration(seconds: 1));
    expect(Theme.of(tester.element(find.text('bottomSheet'))).brightness, equals(Brightness.light));

    await tester.tap(find.text('bottomSheet')); // dismiss the bottom sheet
    await tester.pump(const Duration(seconds: 1));
  });

  testWidgets('Dialog inherits shadowed app theme', (WidgetTester tester) async {
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(brightness: Brightness.dark),
        home: Theme(
          data: ThemeData(brightness: Brightness.light),
          child: Scaffold(
            key: scaffoldKey,
            body: Center(
              child: Builder(
                builder: (BuildContext context) {
                  return ElevatedButton(
                    onPressed: () {
                      showDialog<void>(
                        context: context,
                        builder: (BuildContext context) => const Text('dialog'),
                      );
                    },
                    child: const Text('SHOW'),
                  );
                }
              ),
            ),
          ),
        ),
      ),
    );

    await tester.tap(find.text('SHOW'));
    await tester.pump(const Duration(seconds: 1));
    expect(Theme.of(tester.element(find.text('dialog'))).brightness, equals(Brightness.light));
  });

  testWidgets("Scaffold inherits theme's scaffoldBackgroundColor", (WidgetTester tester) async {
    const Color green = Color(0xFF00FF00);

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(scaffoldBackgroundColor: green),
        home: Scaffold(
          body: Center(
            child: Builder(
              builder: (BuildContext context) {
                return GestureDetector(
                  onTap: () {
                    showDialog<void>(
                      context: context,
                      builder: (BuildContext context) {
                        return const Scaffold(
                          body: SizedBox(
                            width: 200.0,
                            height: 200.0,
                          ),
                        );
                      },
                    );
                  },
                  child: const Text('SHOW'),
                );
              },
            ),
          ),
        ),
      ),
    );

    await tester.tap(find.text('SHOW'));
    await tester.pump(const Duration(seconds: 1));

    final List<Material> materials = tester.widgetList<Material>(find.byType(Material)).toList();
    expect(materials.length, equals(2));
    expect(materials[0].color, green); // app scaffold
    expect(materials[1].color, green); // dialog scaffold
  });

  testWidgets('IconThemes are applied', (WidgetTester tester) async {
    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(iconTheme: const IconThemeData(color: Colors.green, size: 10.0)),
        home: const Icon(Icons.computer),
      ),
    );

    RenderParagraph glyphText = tester.renderObject(find.byType(RichText));

    expect(glyphText.text.style.color, Colors.green);
    expect(glyphText.text.style.fontSize, 10.0);

    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData(iconTheme: const IconThemeData(color: Colors.orange, size: 20.0)),
        home: const Icon(Icons.computer),
      ),
    );
    await tester.pump(const Duration(milliseconds: 100)); // Halfway through the theme transition

    glyphText = tester.renderObject(find.byType(RichText));

    expect(glyphText.text.style.color, Color.lerp(Colors.green, Colors.orange, 0.5));
    expect(glyphText.text.style.fontSize, 15.0);

    await tester.pump(const Duration(milliseconds: 100)); // Finish the transition
    glyphText = tester.renderObject(find.byType(RichText));

    expect(glyphText.text.style.color, Colors.orange);
    expect(glyphText.text.style.fontSize, 20.0);
  });

  testWidgets(
    'Same ThemeData reapplied does not trigger descendants rebuilds',
    (WidgetTester tester) async {
      testBuildCalled = 0;
      ThemeData themeData = ThemeData(primaryColor: const Color(0xFF000000));

      Widget buildTheme() {
        return Theme(
          data: themeData,
          child: const Test(),
        );
      }

      await tester.pumpWidget(buildTheme());
      expect(testBuildCalled, 1);

      // Pump the same widgets again.
      await tester.pumpWidget(buildTheme());
      // No repeated build calls to the child since it's the same theme data.
      expect(testBuildCalled, 1);

      // New instance of theme data but still the same content.
      themeData = ThemeData(primaryColor: const Color(0xFF000000));
      await tester.pumpWidget(buildTheme());
      // Still no repeated calls.
      expect(testBuildCalled, 1);

      // Different now.
      themeData = ThemeData(primaryColor: const Color(0xFF222222));
      await tester.pumpWidget(buildTheme());
      // Should call build again.
      expect(testBuildCalled, 2);
    },
  );

  testWidgets('Text geometry set in Theme has higher precedence than that of Localizations', (WidgetTester tester) async {
    const double _kMagicFontSize = 4321.0;
    final ThemeData fallback = ThemeData.fallback();
    final ThemeData customTheme = fallback.copyWith(
      primaryTextTheme: fallback.primaryTextTheme.copyWith(
        bodyText2: fallback.primaryTextTheme.bodyText2.copyWith(
          fontSize: _kMagicFontSize,
        ),
      ),
    );
    expect(customTheme.primaryTextTheme.bodyText2.fontSize, _kMagicFontSize);

    double actualFontSize;
    await tester.pumpWidget(Directionality(
      textDirection: TextDirection.ltr,
      child: Theme(
        data: customTheme,
        child: Builder(builder: (BuildContext context) {
          final ThemeData theme = Theme.of(context);
          actualFontSize = theme.primaryTextTheme.bodyText2.fontSize;
          return Text(
            'A',
            style: theme.primaryTextTheme.bodyText2,
          );
        }),
      ),
    ));

    expect(actualFontSize, _kMagicFontSize);
  });

  testWidgets('Default Theme provides all basic TextStyle properties', (WidgetTester tester) async {
    ThemeData theme;
    await tester.pumpWidget(Directionality(
      textDirection: TextDirection.ltr,
      child: Builder(
        builder: (BuildContext context) {
          theme = Theme.of(context);
          return const Text('A');
        },
      ),
    ));

    List<TextStyle> extractStyles(TextTheme textTheme) {
      return <TextStyle>[
        textTheme.headline1,
        textTheme.headline2,
        textTheme.headline3,
        textTheme.headline4,
        textTheme.headline5,
        textTheme.headline6,
        textTheme.subtitle1,
        textTheme.bodyText1,
        textTheme.bodyText2,
        textTheme.caption,
        textTheme.button,
      ];
    }

    for (final TextTheme textTheme in <TextTheme>[theme.textTheme, theme.primaryTextTheme, theme.accentTextTheme]) {
      for (final TextStyle style in extractStyles(textTheme).map<TextStyle>((TextStyle style) => _TextStyleProxy(style))) {
        expect(style.inherit, false);
        expect(style.color, isNotNull);
        expect(style.fontFamily, isNotNull);
        expect(style.fontSize, isNotNull);
        expect(style.fontWeight, isNotNull);
        expect(style.fontStyle, null);
        expect(style.letterSpacing, null);
        expect(style.wordSpacing, null);
        expect(style.textBaseline, isNotNull);
        expect(style.height, null);
        expect(style.decoration, TextDecoration.none);
        expect(style.decorationColor, null);
        expect(style.decorationStyle, null);
        expect(style.debugLabel, isNotNull);
        expect(style.locale, null);
        expect(style.background, null);
      }
    }

    expect(theme.textTheme.headline1.debugLabel, '(englishLike display4 2014).merge(blackMountainView headline1)');
  });

  group('Cupertino theme', () {
    int buildCount;
    CupertinoThemeData actualTheme;
    IconThemeData actualIconTheme;
    BuildContext context;

    final Widget singletonThemeSubtree = Builder(
      builder: (BuildContext localContext) {
        buildCount++;
        actualTheme = CupertinoTheme.of(localContext);
        actualIconTheme = IconTheme.of(localContext);
        context = localContext;
        return const Placeholder();
      },
    );

    Future<CupertinoThemeData> testTheme(WidgetTester tester, ThemeData theme) async {
      await tester.pumpWidget(Theme(data: theme, child: singletonThemeSubtree));
      return actualTheme;
    }

    setUp(() {
      buildCount = 0;
      actualTheme = null;
      actualIconTheme = null;
      context = null;
    });

    testWidgets('Default theme has defaults', (WidgetTester tester) async {
      final CupertinoThemeData theme = await testTheme(tester, ThemeData.light());

      expect(theme.brightness, Brightness.light);
      expect(theme.primaryColor, Colors.blue);
      expect(theme.scaffoldBackgroundColor, Colors.grey[50]);
      expect(theme.primaryContrastingColor, Colors.white);
      expect(theme.textTheme.textStyle.fontFamily, '.SF Pro Text');
      expect(theme.textTheme.textStyle.fontSize, 17.0);
    });

    testWidgets('Dark theme has defaults', (WidgetTester tester) async {
      final CupertinoThemeData theme = await testTheme(tester, ThemeData.dark());

      expect(theme.brightness, Brightness.dark);
      expect(theme.primaryColor, Colors.blue);
      expect(theme.primaryContrastingColor, Colors.white);
      expect(theme.scaffoldBackgroundColor, Colors.grey[850]);
      expect(theme.textTheme.textStyle.fontFamily, '.SF Pro Text');
      expect(theme.textTheme.textStyle.fontSize, 17.0);
    });

    testWidgets('MaterialTheme overrides the brightness', (WidgetTester tester) async {
      await testTheme(tester, ThemeData.dark());
      expect(CupertinoTheme.brightnessOf(context), Brightness.dark);

      await testTheme(tester, ThemeData.light());
      expect(CupertinoTheme.brightnessOf(context), Brightness.light);

      // Overridable by cupertinoOverrideTheme.
      await testTheme(tester, ThemeData(
        brightness: Brightness.light,
        cupertinoOverrideTheme: const CupertinoThemeData(brightness: Brightness.dark),
      ));
      expect(CupertinoTheme.brightnessOf(context), Brightness.dark);

      await testTheme(tester, ThemeData(
        brightness: Brightness.dark,
        cupertinoOverrideTheme: const CupertinoThemeData(brightness: Brightness.light),
      ));
      expect(CupertinoTheme.brightnessOf(context), Brightness.light);
    });

    testWidgets('Can override material theme', (WidgetTester tester) async {
      final CupertinoThemeData theme = await testTheme(tester, ThemeData(
        cupertinoOverrideTheme: const CupertinoThemeData(
          scaffoldBackgroundColor: CupertinoColors.lightBackgroundGray,
        ),
      ));

      expect(theme.brightness, Brightness.light);
      // We took the scaffold background override but the rest are still cascaded
      // to the material theme.
      expect(theme.primaryColor, Colors.blue);
      expect(theme.primaryContrastingColor, Colors.white);
      expect(theme.scaffoldBackgroundColor, CupertinoColors.lightBackgroundGray);
      expect(theme.textTheme.textStyle.fontFamily, '.SF Pro Text');
      expect(theme.textTheme.textStyle.fontSize, 17.0);
    });

    testWidgets('Can override properties that are independent of material', (WidgetTester tester) async {
      final CupertinoThemeData theme = await testTheme(tester, ThemeData(
        cupertinoOverrideTheme: const CupertinoThemeData(
          // The bar colors ignore all things material except brightness.
          barBackgroundColor: CupertinoColors.black,
        ),
      ));

      expect(theme.primaryColor, Colors.blue);
      // MaterialBasedCupertinoThemeData should also function like a normal CupertinoThemeData.
      expect(theme.barBackgroundColor, CupertinoColors.black);
    });

    testWidgets('Changing material theme triggers rebuilds', (WidgetTester tester) async {
      CupertinoThemeData theme = await testTheme(tester, ThemeData(
        primarySwatch: Colors.red,
      ));

      expect(buildCount, 1);
      expect(theme.primaryColor, Colors.red);

      theme = await testTheme(tester, ThemeData(
        primarySwatch: Colors.orange,
      ));

      expect(buildCount, 2);
      expect(theme.primaryColor, Colors.orange);
    });

    testWidgets("CupertinoThemeData does not override material theme's icon theme",
      (WidgetTester tester) async {
        const Color materialIconColor = Colors.blue;
        const Color cupertinoIconColor = Colors.black;

        await testTheme(tester, ThemeData(
            iconTheme: const IconThemeData(color: materialIconColor),
            cupertinoOverrideTheme: const CupertinoThemeData(primaryColor: cupertinoIconColor),
        ));

        expect(buildCount, 1);
        expect(actualIconTheme.color, materialIconColor);
    });

    testWidgets(
      'Changing cupertino theme override triggers rebuilds',
      (WidgetTester tester) async {
        CupertinoThemeData theme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.purple,
          cupertinoOverrideTheme: const CupertinoThemeData(
            primaryColor: CupertinoColors.activeOrange,
          ),
        ));

        expect(buildCount, 1);
        expect(theme.primaryColor, CupertinoColors.activeOrange);

        theme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.purple,
          cupertinoOverrideTheme: const CupertinoThemeData(
            primaryColor: CupertinoColors.activeGreen,
          ),
        ));

        expect(buildCount, 2);
        expect(theme.primaryColor, CupertinoColors.activeGreen);
      },
    );

    testWidgets(
      'Cupertino theme override blocks derivative changes',
      (WidgetTester tester) async {
        CupertinoThemeData theme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.purple,
          cupertinoOverrideTheme: const CupertinoThemeData(
            primaryColor: CupertinoColors.activeOrange,
          ),
        ));

        expect(buildCount, 1);
        expect(theme.primaryColor, CupertinoColors.activeOrange);

        // Change the upstream material primary color.
        theme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.blue,
          cupertinoOverrideTheme: const CupertinoThemeData(
            // But the primary material color is preempted by the override.
            primaryColor: CupertinoColors.activeOrange,
          ),
        ));

        expect(buildCount, 2);
        expect(theme.primaryColor, CupertinoColors.activeOrange);
      },
    );

    testWidgets(
      'Cupertino overrides do not block derivatives triggering rebuilds when derivatives are not overridden',
      (WidgetTester tester) async {
        CupertinoThemeData theme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.purple,
          cupertinoOverrideTheme: const CupertinoThemeData(
            primaryContrastingColor: CupertinoColors.destructiveRed,
          ),
        ));

        expect(buildCount, 1);
        expect(theme.textTheme.actionTextStyle.color, Colors.purple);
        expect(theme.primaryContrastingColor, CupertinoColors.destructiveRed);

        theme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.green,
          cupertinoOverrideTheme: const CupertinoThemeData(
            primaryContrastingColor: CupertinoColors.destructiveRed,
          ),
        ));

        expect(buildCount, 2);
        expect(theme.textTheme.actionTextStyle.color, Colors.green);
        expect(theme.primaryContrastingColor, CupertinoColors.destructiveRed);
      },
    );

    testWidgets(
      'copyWith only copies the overrides, not the material or cupertino derivatives',
      (WidgetTester tester) async {
        final CupertinoThemeData originalTheme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.purple,
          cupertinoOverrideTheme: const CupertinoThemeData(
            primaryContrastingColor: CupertinoColors.activeOrange,
          ),
        ));

        final CupertinoThemeData copiedTheme = originalTheme.copyWith(
          barBackgroundColor: CupertinoColors.destructiveRed,
        );

        final CupertinoThemeData theme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.blue,
          cupertinoOverrideTheme: copiedTheme,
        ));

        expect(theme.primaryColor, Colors.blue);
        expect(theme.primaryContrastingColor, CupertinoColors.activeOrange);
        expect(theme.barBackgroundColor, CupertinoColors.destructiveRed);
      },
    );

    testWidgets(
      "Material themes with no cupertino overrides can also be copyWith'ed",
      (WidgetTester tester) async {
        final CupertinoThemeData originalTheme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.purple,
        ));

        final CupertinoThemeData copiedTheme = originalTheme.copyWith(
          primaryContrastingColor: CupertinoColors.destructiveRed,
        );

        final CupertinoThemeData theme = await testTheme(tester, ThemeData(
          primarySwatch: Colors.blue,
          cupertinoOverrideTheme: copiedTheme,
        ));

        expect(theme.primaryColor, Colors.blue);
        expect(theme.primaryContrastingColor, CupertinoColors.destructiveRed);
      },
    );
  });
}

int testBuildCalled;
class Test extends StatefulWidget {
  const Test({ Key key }) : super(key: key);

  @override
  _TestState createState() => _TestState();
}

class _TestState extends State<Test> {
  @override
  Widget build(BuildContext context) {
    testBuildCalled += 1;
    return Container(
      decoration: BoxDecoration(
        color: Theme.of(context).primaryColor,
      ),
    );
  }
}

/// This class exists only to make sure that we test all the properties of the
/// [TextStyle] class. If a property is added/removed/renamed, the analyzer will
/// complain that this class has incorrect overrides.
class _TextStyleProxy implements TextStyle {
  _TextStyleProxy(this._delegate);

  final TextStyle _delegate;

  // Do make sure that all the properties correctly forward to the _delegate.
  @override
  Color get color => _delegate.color;
  @override
  Color get backgroundColor => _delegate.backgroundColor;
  @override
  String get debugLabel => _delegate.debugLabel;
  @override
  TextDecoration get decoration => _delegate.decoration;
  @override
  Color get decorationColor => _delegate.decorationColor;
  @override
  TextDecorationStyle get decorationStyle => _delegate.decorationStyle;
  @override
  double get decorationThickness => _delegate.decorationThickness;
  @override
  String get fontFamily => _delegate.fontFamily;
  @override
  List<String> get fontFamilyFallback => _delegate.fontFamilyFallback;
  @override
  double get fontSize => _delegate.fontSize;
  @override
  FontStyle get fontStyle => _delegate.fontStyle;
  @override
  FontWeight get fontWeight => _delegate.fontWeight;
  @override
  double get height => _delegate.height;
  @override
  Locale get locale => _delegate.locale;
  @override
  ui.Paint get foreground => _delegate.foreground;
  @override
  ui.Paint get background => _delegate.background;
  @override
  bool get inherit => _delegate.inherit;
  @override
  double get letterSpacing => _delegate.letterSpacing;
  @override
  TextBaseline get textBaseline => _delegate.textBaseline;
  @override
  double get wordSpacing => _delegate.wordSpacing;
  @override
  List<Shadow> get shadows => _delegate.shadows;
  @override
  List<ui.FontFeature> get fontFeatures => _delegate.fontFeatures;

  @override
  String toString({ DiagnosticLevel minLevel = DiagnosticLevel.info }) =>
      super.toString();

  @override
  DiagnosticsNode toDiagnosticsNode({ String name, DiagnosticsTreeStyle style }) {
    throw UnimplementedError();
  }

  @override
  String toStringShort() {
    throw UnimplementedError();
  }

  @override
  TextStyle apply({
    Color color,
    Color backgroundColor,
    TextDecoration decoration,
    Color decorationColor,
    TextDecorationStyle decorationStyle,
    double decorationThicknessFactor = 1.0,
    double decorationThicknessDelta = 0.0,
    String fontFamily,
    List<String> fontFamilyFallback,
    double fontSizeFactor = 1.0,
    double fontSizeDelta = 0.0,
    int fontWeightDelta = 0,
    FontStyle fontStyle,
    double letterSpacingFactor = 1.0,
    double letterSpacingDelta = 0.0,
    double wordSpacingFactor = 1.0,
    double wordSpacingDelta = 0.0,
    double heightFactor = 1.0,
    double heightDelta = 0.0,
    TextBaseline textBaseline,
    Locale locale,
    List<ui.Shadow> shadows,
    List<ui.FontFeature> fontFeatures,
  }) {
    throw UnimplementedError();
  }

  @override
  RenderComparison compareTo(TextStyle other) {
    throw UnimplementedError();
  }

  @override
  TextStyle copyWith({
    bool inherit,
    Color color,
    Color backgroundColor,
    String fontFamily,
    List<String> fontFamilyFallback,
    double fontSize,
    FontWeight fontWeight,
    FontStyle fontStyle,
    double letterSpacing,
    double wordSpacing,
    TextBaseline textBaseline,
    double height,
    Locale locale,
    ui.Paint foreground,
    ui.Paint background,
    List<Shadow> shadows,
    List<ui.FontFeature> fontFeatures,
    TextDecoration decoration,
    Color decorationColor,
    TextDecorationStyle decorationStyle,
    double decorationThickness,
    String debugLabel,
  }) {
    throw UnimplementedError();
  }

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties, { String prefix = '' }) {
    throw UnimplementedError();
  }

  @override
  ui.ParagraphStyle getParagraphStyle({
    TextAlign textAlign,
    TextDirection textDirection,
    double textScaleFactor = 1.0,
    String ellipsis,
    int maxLines,
    ui.TextHeightBehavior textHeightBehavior,
    Locale locale,
    String fontFamily,
    double fontSize,
    FontWeight fontWeight,
    FontStyle fontStyle,
    double height,
    StrutStyle strutStyle,
  }) {
    throw UnimplementedError();
  }

  @override
  ui.TextStyle getTextStyle({ double textScaleFactor = 1.0 }) {
    throw UnimplementedError();
  }

  @override
  TextStyle merge(TextStyle other) {
    throw UnimplementedError();
  }
}