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flutter/dev/bots/check_code_samples.dart
auto-submit[bot] 07ca92a69e
Reverts "Added ButtonStyle.foregroundBuilder and ButtonStyle.backgroundBuilder" (#142748) 
Reverts flutter/flutter#141818
Initiated by: XilaiZhang
This change reverts the following previous change:
Original Description:
Fixes https://github.com/flutter/flutter/issues/139456, https://github.com/flutter/flutter/issues/130335, https://github.com/flutter/flutter/issues/89563.

Two new properties have been added to ButtonStyle to make it possible to insert arbitrary state-dependent widgets in a button's background or foreground. These properties can be specified for an individual button, using the style parameter, or for all buttons using a button theme's style parameter.

The new ButtonStyle properties are `backgroundBuilder` and `foregroundBuilder` and their (function) types are:

```dart
typedef ButtonLayerBuilder = Widget Function(
  BuildContext context,
  Set<MaterialState> states,
  Widget? child
);
```

The new builder functions are called whenever the button is built and the `states` parameter communicates the pressed/hovered/etc state fo the button.

## `backgroundBuilder`

Creates a widget that becomes the child of the button's Material and whose child is the rest of the button, including the button's `child` parameter.  By default the returned widget is clipped to the Material's ButtonStyle.shape.

The `backgroundBuilder` can be used to add a gradient to the button's background. Here's an example that creates a yellow/orange gradient background:

![opaque-gradient-bg](https://github.com/flutter/flutter/assets/1377460/80df8368-e7cf-49ef-aee7-2776a573644c)

```dart
TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
    backgroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      return DecoratedBox(
        decoration: BoxDecoration(
          gradient: LinearGradient(colors: [Colors.orange, Colors.yellow]),
        ),
        child: child,
      );
    },
  ),
  child: Text('Text Button'),
)
```

Because the background widget becomes the child of the button's Material, if it's opaque (as it is in this case) then it obscures the overlay highlights which are painted on the button's Material. To ensure that the highlights show through one can decorate the background with an `Ink` widget.  This version also overrides the overlay color to be (shades of) red, because that makes the highlights look a little nicer with the yellow/orange background.

![ink-gradient-bg](https://github.com/flutter/flutter/assets/1377460/68a49733-f30e-44a1-a948-dc8cc95e1716)

```dart
TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
    overlayColor: Colors.red,
    backgroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      return Ink(
        decoration: BoxDecoration(
          gradient: LinearGradient(colors: [Colors.orange, Colors.yellow]),
        ),
        child: child,
      );
    },
  ),
  child: Text('Text Button'),
)
```

Now the button's overlay highlights are painted on the Ink widget. An Ink widget isn't needed if the background is sufficiently translucent. This version of the example creates a translucent backround widget. 

![translucent-graident-bg](https://github.com/flutter/flutter/assets/1377460/3b016e1f-200a-4d07-8111-e20d29f18014)

```dart
TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
    overlayColor: Colors.red,
    backgroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      return DecoratedBox(
        decoration: BoxDecoration(
          gradient: LinearGradient(colors: [
            Colors.orange.withOpacity(0.5),
            Colors.yellow.withOpacity(0.5),
          ]),
        ),
        child: child,
      );
    },
  ),
  child: Text('Text Button'),
)
```

One can also decorate the background with an image. In this example, the button's background is an burlap texture image. The foreground color has been changed to black to make the button's text a little clearer relative to the mottled brown backround.

![burlap-bg](https://github.com/flutter/flutter/assets/1377460/f2f61ab1-10d9-43a4-bd63-beecdce33b45)

```dart
TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
    foregroundColor: Colors.black,
    backgroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      return Ink(
        decoration: BoxDecoration(
          image: DecorationImage(
            image: NetworkImage(burlapUrl),
            fit: BoxFit.cover,
          ),
        ),
        child: child,
      );
    },
  ),
  child: Text('Text Button'),
)
```

The background widget can depend on the `states` parameter. In this example the blue/orange gradient flips horizontally when the button is hovered/pressed.

![gradient-flip](https://github.com/flutter/flutter/assets/1377460/c6c6fe26-ae47-445b-b82d-4605d9583bd8)

```dart
TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
    backgroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      final Color color1 = Colors.blue.withOpacity(0.5);
      final Color color2 = Colors.orange.withOpacity(0.5);
      return DecoratedBox(
        decoration: BoxDecoration(
          gradient: LinearGradient(
            colors: switch (states.contains(MaterialState.hovered)) {
              true => <Color>[color1, color2],
              false => <Color>[color2, color1],
            },
          ),
        ),
        child: child,
      );
    },
  ),
  child: Text('Text Button'),
)
```

The preceeding examples have not included a BoxDecoration border because ButtonStyle already supports `ButtonStyle.shape` and `ButtonStyle.side` parameters that can be uesd to define state-dependent borders. Borders defined with the ButtonStyle side parameter match the button's shape. To add a border that changes color when the button is hovered or pressed, one must specify the side property using `copyWith`, since there's no `styleFrom` shorthand for this case.

![border-gradient-bg](https://github.com/flutter/flutter/assets/1377460/63cffcd3-0dcf-4eb1-aed5-d14adf1e57f6)

```dart
TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
    foregroundColor: Colors.indigo,
    backgroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      final Color color1 = Colors.blue.withOpacity(0.5);
      final Color color2 = Colors.orange.withOpacity(0.5);
      return DecoratedBox(
        decoration: BoxDecoration(
          gradient: LinearGradient(
            colors: switch (states.contains(MaterialState.hovered)) {
              true => <Color>[color1, color2],
              false => <Color>[color2, color1],
            },
          ),
        ),
        child: child,
      );
    },
  ).copyWith(
    side: MaterialStateProperty.resolveWith<BorderSide?>((Set<MaterialState> states) {
      if (states.contains(MaterialState.hovered)) {
        return BorderSide(width: 3, color: Colors.yellow);
      }
      return null; // defer to the default
    }),
  ),
  child: Text('Text Button'),
)
```

Although all of the examples have created a ButtonStyle locally and only applied it to one button, they could have configured the `ThemeData.textButtonTheme` instead and applied the style to all TextButtons. And, of course, all of this works for all of the ButtonStyleButton classes, not just TextButton.

## `foregroundBuilder`

Creates a Widget that contains the button's child parameter. The returned widget is clipped by the button's [ButtonStyle.shape] inset by the button's [ButtonStyle.padding] and aligned by the button's [ButtonStyle.alignment].

The `foregroundBuilder` can be used to wrap the button's child, e.g. with a border or a `ShaderMask` or as a state-dependent substitute for the child.

This example adds a border that's just applied to the child. The border only appears when the button is hovered/pressed.

![border-fg](https://github.com/flutter/flutter/assets/1377460/687a3245-fe68-4983-a04e-5fcc77f8aa21)

```dart
ElevatedButton(
  onPressed: () {},
  style: ElevatedButton.styleFrom(
    foregroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      final ColorScheme colorScheme = Theme.of(context).colorScheme;
      return DecoratedBox(
        decoration: BoxDecoration(
          border: states.contains(MaterialState.hovered)
            ? Border(bottom: BorderSide(color: colorScheme.primary))
            : Border(), // essentially "no border"
        ),
        child: child,
      );
    },
  ),
  child: Text('Text Button'),
)
```

The foregroundBuilder can be used with `ShaderMask` to change the way the button's child is rendered. In this example the ShaderMask's gradient causes the button's child to fade out on top.

![shader_mask_fg](https://github.com/flutter/flutter/assets/1377460/54010f24-e65d-4551-ae58-712135df3d8d)

```dart
ElevatedButton(
  onPressed: () { },
  style: ElevatedButton.styleFrom(
    foregroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      final ColorScheme colorScheme = Theme.of(context).colorScheme;
      return ShaderMask(
        shaderCallback: (Rect bounds) {
          return LinearGradient(
            begin: Alignment.bottomCenter,
            end: Alignment.topCenter,
            colors: <Color>[
              colorScheme.primary,
              colorScheme.primaryContainer,
            ],
          ).createShader(bounds);
        },
        blendMode: BlendMode.srcATop,
        child: child,
      );
    },
  ),
  child:  const Text('Elevated Button'),
)
```

A commonly requested configuration for butttons has the developer provide images, one for pressed/hovered/normal state. You can use the foregroundBuilder to create a button that fades between a normal image and another image when the button is pressed. In this case the foregroundBuilder doesn't use the child it's passed, even though we've provided the required TextButton child parameter.

![image-button](https://github.com/flutter/flutter/assets/1377460/f5b1a22f-43ce-4be3-8e70-06de4c958380)

```dart
TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
    foregroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      final String url = states.contains(MaterialState.pressed) ? smiley2Url : smiley1Url;
      return AnimatedContainer(
        width: 100,
        height: 100,
        duration: Duration(milliseconds: 300),
        decoration: BoxDecoration(
          image: DecorationImage(
            image: NetworkImage(url),
            fit: BoxFit.contain,
          ),
        ),
      );
    },
  ),
  child: Text('No Child'),
)
```

In this example the button's default overlay appears when the button is hovered and pressed. Another image can be used to indicate the hovered state and the default overlay can be defeated by specifying `Colors.transparent` for the `overlayColor`:

![image-per-state](https://github.com/flutter/flutter/assets/1377460/7ab9da2f-f661-4374-b395-c2e0c7c4cf13)

```dart
TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
    overlayColor: Colors.transparent,
    foregroundBuilder: (BuildContext context, Set<MaterialState> states, Widget? child) {
      String url = states.contains(MaterialState.hovered) ? smiley3Url : smiley1Url;
      if (states.contains(MaterialState.pressed)) {
        url = smiley2Url;
      }
      return AnimatedContainer(
        width: 100,
        height: 100,
        duration: Duration(milliseconds: 300),
        decoration: BoxDecoration(
          image: DecorationImage(
            image: NetworkImage(url),
            fit: BoxFit.contain,
          ),
        ),
      );
    },
  ),
  child: Text('No Child'),
)
```
2024-02-01 21:11:26 +00:00

495 lines
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// 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.
// To run this, from the root of the Flutter repository:
// bin/cache/dart-sdk/bin/dart --enable-asserts dev/bots/check_code_sample_links.dart
import 'dart:io';
import 'package:args/args.dart';
import 'package:file/file.dart';
import 'package:file/local.dart';
import 'package:path/path.dart' as path;
import 'utils.dart';
final String _scriptLocation = path.fromUri(Platform.script);
final String _flutterRoot = path.dirname(path.dirname(path.dirname(_scriptLocation)));
final String _exampleDirectoryPath = path.join(_flutterRoot, 'examples', 'api');
final String _packageDirectoryPath = path.join(_flutterRoot, 'packages');
final String _dartUIDirectoryPath = path.join(_flutterRoot, 'bin', 'cache', 'pkg', 'sky_engine', 'lib');
final List<String> _knownUnlinkedExamples = <String>[
// These are template files that aren't expected to be linked.
'examples/api/lib/sample_templates/cupertino.0.dart',
'examples/api/lib/sample_templates/widgets.0.dart',
'examples/api/lib/sample_templates/material.0.dart',
];
void main(List<String> args) {
final ArgParser argParser = ArgParser();
argParser.addFlag(
'help',
negatable: false,
help: 'Print help for this command.',
);
argParser.addOption(
'examples',
valueHelp: 'path',
defaultsTo: _exampleDirectoryPath,
help: 'A location where the API doc examples are found.',
);
argParser.addOption(
'packages',
valueHelp: 'path',
defaultsTo: _packageDirectoryPath,
help: 'A location where the source code that should link the API doc examples is found.',
);
argParser.addOption(
'dart-ui',
valueHelp: 'path',
defaultsTo: _dartUIDirectoryPath,
help: 'A location where the source code that should link the API doc examples is found.',
);
argParser.addOption(
'flutter-root',
valueHelp: 'path',
defaultsTo: _flutterRoot,
help: 'The path to the root of the Flutter repo.',
);
final ArgResults parsedArgs;
void usage() {
print('dart --enable-asserts ${path.basename(_scriptLocation)} [options]');
print(argParser.usage);
}
try {
parsedArgs = argParser.parse(args);
} on FormatException catch (e) {
print(e.message);
usage();
exit(1);
}
if (parsedArgs['help'] as bool) {
usage();
exit(0);
}
const FileSystem filesystem = LocalFileSystem();
final Directory examples = filesystem.directory(parsedArgs['examples']! as String);
final Directory packages = filesystem.directory(parsedArgs['packages']! as String);
final Directory dartUIPath = filesystem.directory(parsedArgs['dart-ui']! as String);
final Directory flutterRoot = filesystem.directory(parsedArgs['flutter-root']! as String);
final SampleChecker checker = SampleChecker(
examples: examples,
packages: packages,
dartUIPath: dartUIPath,
flutterRoot: flutterRoot,
);
if (!checker.checkCodeSamples()) {
reportErrorsAndExit('Some errors were found in the API docs code samples.');
}
reportSuccessAndExit('All examples are linked and have tests.');
}
class LinkInfo {
const LinkInfo(this.link, this.file, this.line);
final String link;
final File file;
final int line;
@override
String toString() {
return '${file.path}:$line: $link';
}
}
class SampleChecker {
SampleChecker({
required this.examples,
required this.packages,
required this.dartUIPath,
required this.flutterRoot,
this.filesystem = const LocalFileSystem(),
});
final Directory examples;
final Directory packages;
final Directory dartUIPath;
final Directory flutterRoot;
final FileSystem filesystem;
bool checkCodeSamples() {
filesystem.currentDirectory = flutterRoot;
// Get a list of all the filenames in the source directory that end in "[0-9]+.dart".
final List<File> exampleFilenames = getExampleFilenames(examples);
// Get a list of all the example link paths that appear in the source files.
final (Set<String> exampleLinks, Set<LinkInfo> malformedLinks) = getExampleLinks(packages);
// Also add in any that might be found in the dart:ui directory.
final (Set<String> uiExampleLinks, Set<LinkInfo> uiMalformedLinks) = getExampleLinks(dartUIPath);
exampleLinks.addAll(uiExampleLinks);
malformedLinks.addAll(uiMalformedLinks);
// Get a list of the filenames that were not found in the source files.
final List<String> missingFilenames = checkForMissingLinks(exampleFilenames, exampleLinks);
// Get a list of any tests that are missing, as well as any that used to be
// missing, but have been implemented.
final (List<File> missingTests, List<File> noLongerMissing) = checkForMissingTests(exampleFilenames);
// Remove any that we know are exceptions (examples that aren't expected to be
// linked into any source files). These are typically template files used to
// generate new examples.
missingFilenames.removeWhere((String file) => _knownUnlinkedExamples.contains(file));
if (missingFilenames.isEmpty && missingTests.isEmpty && noLongerMissing.isEmpty && malformedLinks.isEmpty) {
return true;
}
if (noLongerMissing.isNotEmpty) {
final StringBuffer buffer = StringBuffer('The following tests have been implemented! Huzzah!:\n');
for (final File name in noLongerMissing) {
buffer.writeln(' ${getRelativePath(name)}');
}
buffer.writeln('However, they now need to be removed from the _knownMissingTests');
buffer.write('list in the script $_scriptLocation.');
foundError(buffer.toString().split('\n'));
}
if (missingTests.isNotEmpty) {
final StringBuffer buffer = StringBuffer('The following example test files are missing:\n');
for (final File name in missingTests) {
buffer.writeln(' ${getRelativePath(name)}');
}
foundError(buffer.toString().trimRight().split('\n'));
}
if (missingFilenames.isNotEmpty) {
final StringBuffer buffer =
StringBuffer('The following examples are not linked from any source file API doc comments:\n');
for (final String name in missingFilenames) {
buffer.writeln(' $name');
}
buffer.write('Either link them to a source file API doc comment, or remove them.');
foundError(buffer.toString().split('\n'));
}
if (malformedLinks.isNotEmpty) {
final StringBuffer buffer =
StringBuffer('The following malformed links were found in API doc comments:\n');
for (final LinkInfo link in malformedLinks) {
buffer.writeln(' $link');
}
buffer.write(
'Correct the formatting of these links so that they match the exact pattern:\n'
r" r'\*\* See code in (?<path>.+) \*\*'"
);
foundError(buffer.toString().split('\n'));
}
return false;
}
String getRelativePath(File file, [Directory? root]) {
root ??= flutterRoot;
return path.relative(file.absolute.path, from: root.absolute.path);
}
List<File> getFiles(Directory directory, [Pattern? filenamePattern]) {
final List<File> filenames = directory
.listSync(recursive: true)
.map((FileSystemEntity entity) {
if (entity is File) {
return entity;
} else {
return null;
}
})
.where((File? filename) =>
filename != null && (filenamePattern == null || filename.absolute.path.contains(filenamePattern)))
.map<File>((File? s) => s!)
.toList();
return filenames;
}
List<File> getExampleFilenames(Directory directory) {
return getFiles(
directory.childDirectory('lib'),
RegExp(r'\d+\.dart$'),
);
}
(Set<String>, Set<LinkInfo>) getExampleLinks(Directory searchDirectory) {
final List<File> files = getFiles(searchDirectory, RegExp(r'\.dart$'));
final Set<String> searchStrings = <String>{};
final Set<LinkInfo> malformedStrings = <LinkInfo>{};
final RegExp validExampleRe = RegExp(r'\*\* See code in (?<path>.+) \*\*');
// Looks for some common broken versions of example links. This looks for
// something that is at minimum "///*seecode<something>*" to indicate that it
// looks like an example link. It should be narrowed if we start getting false
// positives.
final RegExp malformedLinkRe = RegExp(r'^(?<malformed>\s*///\s*\*\*?\s*[sS][eE][eE]\s*[Cc][Oo][Dd][Ee].+\*\*?)');
for (final File file in files) {
final String contents = file.readAsStringSync();
final List<String> lines = contents.split('\n');
int count = 0;
for (final String line in lines) {
count += 1;
final RegExpMatch? validMatch = validExampleRe.firstMatch(line);
if (validMatch != null) {
searchStrings.add(validMatch.namedGroup('path')!);
}
final RegExpMatch? malformedMatch = malformedLinkRe.firstMatch(line);
// It's only malformed if it doesn't match the valid RegExp.
if (malformedMatch != null && validMatch == null) {
malformedStrings.add(LinkInfo(malformedMatch.namedGroup('malformed')!, file, count));
}
}
}
return (searchStrings, malformedStrings);
}
List<String> checkForMissingLinks(List<File> exampleFilenames, Set<String> searchStrings) {
final List<String> missingFilenames = <String>[];
for (final File example in exampleFilenames) {
final String relativePath = getRelativePath(example);
if (!searchStrings.contains(relativePath)) {
missingFilenames.add(relativePath);
}
}
return missingFilenames;
}
String getTestNameForExample(File example, Directory examples) {
final String testPath = path.dirname(
path.join(
examples.absolute.path,
'test',
getRelativePath(example, examples.childDirectory('lib')),
),
);
return '${path.join(testPath, path.basenameWithoutExtension(example.path))}_test.dart';
}
(List<File>, List<File>) checkForMissingTests(List<File> exampleFilenames) {
final List<File> missingTests = <File>[];
final List<File> noLongerMissingTests = <File>[];
for (final File example in exampleFilenames) {
final File testFile = filesystem.file(getTestNameForExample(example, examples));
final String name = path.relative(testFile.absolute.path, from: flutterRoot.absolute.path);
if (!testFile.existsSync()) {
missingTests.add(testFile);
} else if (_knownMissingTests.contains(name.replaceAll(r'\', '/'))) {
noLongerMissingTests.add(testFile);
}
}
// Skip any that we know are missing.
missingTests.removeWhere(
(File test) {
final String name = path.relative(test.absolute.path, from: flutterRoot.absolute.path).replaceAll(r'\', '/');
return _knownMissingTests.contains(name);
},
);
return (missingTests, noLongerMissingTests);
}
}
// These tests are known to be missing. They should all eventually be
// implemented, but until they are we allow them, so that we can catch any new
// examples that are added without tests.
//
// TODO(gspencergoog): implement the missing tests.
// See https://github.com/flutter/flutter/issues/130459
final Set<String> _knownMissingTests = <String>{
'examples/api/test/material/bottom_app_bar/bottom_app_bar.2_test.dart',
'examples/api/test/material/bottom_app_bar/bottom_app_bar.1_test.dart',
'examples/api/test/material/theme/theme_extension.1_test.dart',
'examples/api/test/material/material_state/material_state_border_side.0_test.dart',
'examples/api/test/material/material_state/material_state_mouse_cursor.0_test.dart',
'examples/api/test/material/material_state/material_state_outlined_border.0_test.dart',
'examples/api/test/material/material_state/material_state_property.0_test.dart',
'examples/api/test/material/selectable_region/selectable_region.0_test.dart',
'examples/api/test/material/text_field/text_field.2_test.dart',
'examples/api/test/material/text_field/text_field.1_test.dart',
'examples/api/test/material/button_style/button_style.0_test.dart',
'examples/api/test/material/range_slider/range_slider.0_test.dart',
'examples/api/test/material/selection_container/selection_container_disabled.0_test.dart',
'examples/api/test/material/selection_container/selection_container.0_test.dart',
'examples/api/test/material/color_scheme/dynamic_content_color.0_test.dart',
'examples/api/test/material/platform_menu_bar/platform_menu_bar.0_test.dart',
'examples/api/test/material/menu_anchor/menu_anchor.2_test.dart',
'examples/api/test/material/stepper/stepper.controls_builder.0_test.dart',
'examples/api/test/material/flexible_space_bar/flexible_space_bar.0_test.dart',
'examples/api/test/material/floating_action_button_location/standard_fab_location.0_test.dart',
'examples/api/test/material/chip/deletable_chip_attributes.on_deleted.0_test.dart',
'examples/api/test/material/snack_bar/snack_bar.2_test.dart',
'examples/api/test/material/snack_bar/snack_bar.1_test.dart',
'examples/api/test/material/icon_button/icon_button.3_test.dart',
'examples/api/test/material/expansion_panel/expansion_panel_list.expansion_panel_list_radio.0_test.dart',
'examples/api/test/material/input_decorator/input_decoration.1_test.dart',
'examples/api/test/material/input_decorator/input_decoration.prefix_icon_constraints.0_test.dart',
'examples/api/test/material/input_decorator/input_decoration.material_state.0_test.dart',
'examples/api/test/material/input_decorator/input_decoration.2_test.dart',
'examples/api/test/material/input_decorator/input_decoration.0_test.dart',
'examples/api/test/material/input_decorator/input_decoration.label.0_test.dart',
'examples/api/test/material/input_decorator/input_decoration.suffix_icon_constraints.0_test.dart',
'examples/api/test/material/input_decorator/input_decoration.3_test.dart',
'examples/api/test/material/input_decorator/input_decoration.material_state.1_test.dart',
'examples/api/test/material/text_form_field/text_form_field.1_test.dart',
'examples/api/test/material/scrollbar/scrollbar.1_test.dart',
'examples/api/test/material/dropdown_menu/dropdown_menu.1_test.dart',
'examples/api/test/material/radio/radio.toggleable.0_test.dart',
'examples/api/test/material/search_anchor/search_anchor.0_test.dart',
'examples/api/test/material/search_anchor/search_anchor.1_test.dart',
'examples/api/test/material/search_anchor/search_anchor.2_test.dart',
'examples/api/test/material/about/about_list_tile.0_test.dart',
'examples/api/test/material/tab_controller/tab_controller.1_test.dart',
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};
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