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flutter_flutter/dev/tools/gen_defaults/bin/gen_defaults.dart
Taha Tesser 559c314ba3
Update the RangeSlider widget to the 2024 Material Design appearance (#163736) 
Fixes [Update `RangeSlider` for Material 3
redesign](https://github.com/flutter/flutter/issues/162505)

### Description

This PR updates `RangeSlider` with `year2023` flag which can be used to
opt into the 2024 `RangeSlider design appearance.

### Code Sample

<details>
<summary>expand to view the code sample</summary> 

```dart
import 'package:flutter/material.dart';

void main() => runApp(const RangeSliderExampleApp());

class RangeSliderExampleApp extends StatelessWidget {
  const RangeSliderExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        sliderTheme: const SliderThemeData(
          showValueIndicator: ShowValueIndicator.always,
        ),
      ),
      home: Scaffold(
        appBar: AppBar(title: const Text('RangeSlider Sample')),
        body: const RangeSliderExample(),
      ),
    );
  }
}

class RangeSliderExample extends StatefulWidget {
  const RangeSliderExample({super.key});

  @override
  State<RangeSliderExample> createState() => _RangeSliderExampleState();
}

class _RangeSliderExampleState extends State<RangeSliderExample> {
  RangeValues _currentRange1Values = const RangeValues(20.0, 60.0);
  RangeValues _currentRange2Values = const RangeValues(30.0, 80.0);

  @override
  Widget build(BuildContext context) {
    return Column(
      spacing: 20.0,
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        RangeSlider(
          year2023: false,
          values: _currentRange1Values,
          max: 100,
          onChanged: (RangeValues values) {
            setState(() {
              _currentRange1Values = values;
            });
          },
        ),
        RangeSlider(
          year2023: false,
          values: _currentRange2Values,
          max: 100,
          divisions: 10,
          labels: RangeLabels(
            _currentRange2Values.start.round().toString(),
            _currentRange2Values.end.round().toString(),
          ),
          onChanged: (RangeValues values) {
            setState(() {
              _currentRange2Values = values;
            });
          },
        ),
      ],
    );
  }
}
```

</details>

| Preview 1 | Preview 2 |
| --------------- | --------------- |
| <img
src="https://github.com/user-attachments/assets/e14a1b04-4e32-4b37-b2f5-2d2001f53114"/>
| <img
src="https://github.com/user-attachments/assets/aad36529-d576-4ec7-b2e5-49c9387456be"/>
|


# Custom track gap and thumb size 

<img width="343" alt="Screenshot 2025-02-20 at 15 26 09"
src="https://github.com/user-attachments/assets/06c09679-1df8-4380-b3e6-c4add8f0cc42"
/>
<img width="338" alt="Screenshot 2025-02-20 at 15 27 19"
src="https://github.com/user-attachments/assets/6226c515-f96b-412a-b59e-cafd2fba0515"
/>

                

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [ ] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
2025-05-19 17:10:12 +00:00

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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.
// ## Usage
//
// Run this program from the root of the git repository.
//
// ```
// dart dev/tools/gen_defaults/bin/gen_defaults.dart [-v]
// ```
import 'dart:convert';
import 'dart:io';
import 'package:args/args.dart';
import 'package:gen_defaults/action_chip_template.dart';
import 'package:gen_defaults/app_bar_template.dart';
import 'package:gen_defaults/badge_template.dart';
import 'package:gen_defaults/banner_template.dart';
import 'package:gen_defaults/bottom_app_bar_template.dart';
import 'package:gen_defaults/bottom_sheet_template.dart';
import 'package:gen_defaults/button_template.dart';
import 'package:gen_defaults/card_template.dart';
import 'package:gen_defaults/checkbox_template.dart';
import 'package:gen_defaults/chip_template.dart';
import 'package:gen_defaults/color_scheme_template.dart';
import 'package:gen_defaults/date_picker_template.dart';
import 'package:gen_defaults/dialog_template.dart';
import 'package:gen_defaults/divider_template.dart';
import 'package:gen_defaults/drawer_template.dart';
import 'package:gen_defaults/expansion_tile_template.dart';
import 'package:gen_defaults/fab_template.dart';
import 'package:gen_defaults/filter_chip_template.dart';
import 'package:gen_defaults/icon_button_template.dart';
import 'package:gen_defaults/input_chip_template.dart';
import 'package:gen_defaults/input_decorator_template.dart';
import 'package:gen_defaults/list_tile_template.dart';
import 'package:gen_defaults/menu_template.dart';
import 'package:gen_defaults/motion_template.dart';
import 'package:gen_defaults/navigation_bar_template.dart';
import 'package:gen_defaults/navigation_drawer_template.dart';
import 'package:gen_defaults/navigation_rail_template.dart';
import 'package:gen_defaults/popup_menu_template.dart';
import 'package:gen_defaults/progress_indicator_template.dart';
import 'package:gen_defaults/radio_template.dart';
import 'package:gen_defaults/range_slider_template.dart';
import 'package:gen_defaults/search_bar_template.dart';
import 'package:gen_defaults/search_view_template.dart';
import 'package:gen_defaults/segmented_button_template.dart';
import 'package:gen_defaults/slider_template.dart';
import 'package:gen_defaults/snackbar_template.dart';
import 'package:gen_defaults/surface_tint.dart';
import 'package:gen_defaults/switch_template.dart';
import 'package:gen_defaults/tabs_template.dart';
import 'package:gen_defaults/text_field_template.dart';
import 'package:gen_defaults/time_picker_template.dart';
import 'package:gen_defaults/token_logger.dart';
import 'package:gen_defaults/typography_template.dart';
Map<String, dynamic> _readTokenFile(File file) {
return jsonDecode(file.readAsStringSync()) as Map<String, dynamic>;
}
const String materialLib = 'packages/flutter/lib/src/material';
const String dataDir = 'dev/tools/gen_defaults/data';
Future<void> main(List<String> args) async {
// Parse arguments
final ArgParser parser = ArgParser();
parser.addFlag('verbose', abbr: 'v', help: 'Enable verbose output', negatable: false);
final ArgResults argResults = parser.parse(args);
final bool verbose = argResults['verbose'] as bool;
// Map of version number to list of data files that use that version.
final Map<String, List<String>> versionMap = <String, List<String>>{};
// Map of all tokens to their values.
final Map<String, dynamic> tokens = <String, dynamic>{};
// Initialize.
for (final FileSystemEntity tokenFile in Directory(dataDir).listSync()) {
final Map<String, dynamic> tokenFileTokens = _readTokenFile(tokenFile as File);
final String version = tokenFileTokens['version'] as String;
tokenFileTokens.remove('version');
versionMap[version] ??= <String>[];
versionMap[version]!.add(tokenFile.uri.pathSegments.last);
tokens.addAll(tokenFileTokens);
}
tokenLogger.init(allTokens: tokens, versionMap: versionMap);
// Handle light/dark color tokens separately because they share identical token names.
final Map<String, dynamic> colorLightTokens = _readTokenFile(File('$dataDir/color_light.json'));
final Map<String, dynamic> colorDarkTokens = _readTokenFile(File('$dataDir/color_dark.json'));
// The verifyTokenTemplatesUpdateCorrectFiles check in dev/bots/analyze.dart depends on the exact formatting of the next few lines.
// dart format off
// Generate tokens files.
ChipTemplate('Chip', '$materialLib/chip.dart', tokens).updateFile();
ActionChipTemplate('ActionChip', '$materialLib/action_chip.dart', tokens).updateFile();
AppBarTemplate('AppBar', '$materialLib/app_bar.dart', tokens).updateFile();
BottomAppBarTemplate('BottomAppBar', '$materialLib/bottom_app_bar.dart', tokens).updateFile();
BadgeTemplate('Badge', '$materialLib/badge.dart', tokens).updateFile();
BannerTemplate('Banner', '$materialLib/banner.dart', tokens).updateFile();
BottomAppBarTemplate('BottomAppBar', '$materialLib/bottom_app_bar.dart', tokens).updateFile();
BottomSheetTemplate('BottomSheet', '$materialLib/bottom_sheet.dart', tokens).updateFile();
ButtonTemplate('md.comp.elevated-button', 'ElevatedButton', '$materialLib/elevated_button.dart', tokens).updateFile();
ButtonTemplate('md.comp.filled-button', 'FilledButton', '$materialLib/filled_button.dart', tokens).updateFile();
ButtonTemplate('md.comp.filled-tonal-button', 'FilledTonalButton', '$materialLib/filled_button.dart', tokens).updateFile();
ButtonTemplate('md.comp.outlined-button', 'OutlinedButton', '$materialLib/outlined_button.dart', tokens).updateFile();
ButtonTemplate('md.comp.text-button', 'TextButton', '$materialLib/text_button.dart', tokens).updateFile();
CardTemplate('md.comp.elevated-card', 'Card', '$materialLib/card.dart', tokens).updateFile();
CardTemplate('md.comp.filled-card', 'FilledCard', '$materialLib/card.dart', tokens).updateFile();
CardTemplate('md.comp.outlined-card', 'OutlinedCard', '$materialLib/card.dart', tokens).updateFile();
CheckboxTemplate('Checkbox', '$materialLib/checkbox.dart', tokens).updateFile();
ColorSchemeTemplate(colorLightTokens, colorDarkTokens, 'ColorScheme', '$materialLib/theme_data.dart', tokens).updateFile();
DatePickerTemplate('DatePicker', '$materialLib/date_picker_theme.dart', tokens).updateFile();
DialogFullscreenTemplate('DialogFullscreen', '$materialLib/dialog.dart', tokens).updateFile();
DialogTemplate('Dialog', '$materialLib/dialog.dart', tokens).updateFile();
DividerTemplate('Divider', '$materialLib/divider.dart', tokens).updateFile();
DrawerTemplate('Drawer', '$materialLib/drawer.dart', tokens).updateFile();
ExpansionTileTemplate('ExpansionTile', '$materialLib/expansion_tile.dart', tokens).updateFile();
FABTemplate('FAB', '$materialLib/floating_action_button.dart', tokens).updateFile();
FilterChipTemplate('ChoiceChip', '$materialLib/choice_chip.dart', tokens).updateFile();
FilterChipTemplate('FilterChip', '$materialLib/filter_chip.dart', tokens).updateFile();
IconButtonTemplate('md.comp.icon-button', 'IconButton', '$materialLib/icon_button.dart', tokens).updateFile();
IconButtonTemplate('md.comp.filled-icon-button', 'FilledIconButton', '$materialLib/icon_button.dart', tokens).updateFile();
IconButtonTemplate('md.comp.filled-tonal-icon-button', 'FilledTonalIconButton', '$materialLib/icon_button.dart', tokens).updateFile();
IconButtonTemplate('md.comp.outlined-icon-button', 'OutlinedIconButton', '$materialLib/icon_button.dart', tokens).updateFile();
InputChipTemplate('InputChip', '$materialLib/input_chip.dart', tokens).updateFile();
ListTileTemplate('LisTile', '$materialLib/list_tile.dart', tokens).updateFile();
InputDecoratorTemplate('InputDecorator', '$materialLib/input_decorator.dart', tokens).updateFile();
MenuTemplate('Menu', '$materialLib/menu_anchor.dart', tokens).updateFile();
MotionTemplate('Motion', '$materialLib/motion.dart', tokens, tokenLogger).updateFile();
NavigationBarTemplate('NavigationBar', '$materialLib/navigation_bar.dart', tokens).updateFile();
NavigationDrawerTemplate('NavigationDrawer', '$materialLib/navigation_drawer.dart', tokens).updateFile();
NavigationRailTemplate('NavigationRail', '$materialLib/navigation_rail.dart', tokens).updateFile();
PopupMenuTemplate('PopupMenu', '$materialLib/popup_menu.dart', tokens).updateFile();
ProgressIndicatorTemplate('ProgressIndicator', '$materialLib/progress_indicator.dart', tokens).updateFile();
RadioTemplate('Radio<T>', '$materialLib/radio.dart', tokens).updateFile();
RangeSliderTemplate('md.comp.slider', 'RangeSlider', '$materialLib/range_slider.dart', tokens).updateFile();
SearchBarTemplate('SearchBar', '$materialLib/search_anchor.dart', tokens).updateFile();
SearchViewTemplate('SearchView', '$materialLib/search_anchor.dart', tokens).updateFile();
SegmentedButtonTemplate('md.comp.outlined-segmented-button', 'SegmentedButton', '$materialLib/segmented_button.dart', tokens).updateFile();
SnackbarTemplate('md.comp.snackbar', 'Snackbar', '$materialLib/snack_bar.dart', tokens).updateFile();
SliderTemplate('md.comp.slider', 'Slider', '$materialLib/slider.dart', tokens).updateFile();
SurfaceTintTemplate('SurfaceTint', '$materialLib/elevation_overlay.dart', tokens).updateFile();
SwitchTemplate('Switch', '$materialLib/switch.dart', tokens).updateFile();
TimePickerTemplate('TimePicker', '$materialLib/time_picker.dart', tokens).updateFile();
TextFieldTemplate('TextField', '$materialLib/text_field.dart', tokens).updateFile();
TabsTemplate('Tabs', '$materialLib/tabs.dart', tokens).updateFile();
TypographyTemplate('Typography', '$materialLib/typography.dart', tokens).updateFile();
// dart format on
tokenLogger.printVersionUsage(verbose: verbose);
tokenLogger.printTokensUsage(verbose: verbose);
if (!verbose) {
print('\nTo see detailed version and token usage, run with --verbose (-v).');
}
tokenLogger.dumpToFile('dev/tools/gen_defaults/generated/used_tokens.csv');
}
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