generateForAnnotatedElement method

@override Future<String> generateForAnnotatedElement(Element element, ConstantReader annotation, BuildStep buildStep)

Implement to return source code to generate for element.

This method is invoked based on finding elements annotated with an instance of T. The annotation is provided as a ConstantReader.

Supported return values include a single String or multiple String instances within an Iterable or Stream. It is also valid to return a Future of String, Iterable, or Stream.

Implementations should return null when no content is generated. Empty or whitespace-only String instances are also ignored.

Implementation

@override
Future<String> generateForAnnotatedElement(
  Element element,
  ConstantReader annotation,
  BuildStep buildStep,
) async {
  // Verification that only one light and one dark theme exist
  final themeData = await _loadDataFromJson<WidgetbookThemeData>(
    buildStep,
    '**.theme.widgetbook.json',
    (map) => WidgetbookThemeData.fromMap(map),
  );

  final stories = await _loadDataFromJson<WidgetbookStoryData>(
    buildStep,
    '**.story.widgetbook.json',
    (map) => WidgetbookStoryData.fromMap(map),
  );

  final name = _getName(annotation);
  final devices = _getDevices(annotation);
  final lightTheme =
      themeData.firstWhereOrDefault((element) => !element.isDarkTheme);
  final darkTheme =
      themeData.firstWhereOrDefault((element) => element.isDarkTheme);
  final defaultThemeIsDark = _getDefaultTheme(annotation);
  final foldersExpanded = _getFoldersExpanded(annotation);
  final widgetsExpanded = _getWidgetsExpanded(annotation);

  final buffer = StringBuffer()
    ..writeln(
      generateImports(
        [
          ...themeData,
          ...stories,
        ],
      ),
    )
    ..writeln(
      generateMain(),
    )
    ..writeln(
      generateWidgetbook(
        name: name,
        lightTheme: lightTheme,
        darkTheme: darkTheme,
        defaultThemeIsDark: defaultThemeIsDark,
        stories: stories,
        devices: devices,
        foldersExpanded: foldersExpanded,
        widgetsExpanded: widgetsExpanded,
      ),
    );

  return buffer.toString();
}