ViewAttribute

Класс-обертка для атрибутов виджетов. Предоставляет методы создания атрибутов, каста их к нужному типу, а также хранит сам объект атрибутов.

final class ViewAttribute<T> {
  static late final AttributeParserBase _attributeParser;

  static set attributeParser(AttributeParserBase value) {
    _attributeParser = value;
  }

  /// The unique identifier of the view.
  final String id;

  /// The payload of the view attribute.
  ///
  /// Use the [payload] property to access or modify the value of the view attribute.
  final T payload;

  /// Creates a new instance of the [ViewAttribute] class.
  ///
  /// The [payload] parameter is the initial value of the view attribute.
  ViewAttribute({
    required this.payload,
    required this.id,
  });

  /// Casts the view attribute payload to the specified type.
  ///
  /// Return new instance of [ViewAttribute] with new payload type and same data.
  ViewAttribute<R> cast<R>() {
    return ViewAttribute<R>(
      id: id,
      payload: payload as R,
    );
  }

  /// Creates a new [ViewAttribute] from the given [type], [json], and [tag].
  ///
  /// This factory method is used to create a [ViewAttribute] instance
  /// based on the specified [type], [json], and [tag]. It returns a new instance
  /// of [ViewAttribute] with the appropriate payload type.
  static ViewAttribute<R> createAttributes<R>(
    String type,
    Map<String, dynamic>? json,
    String? tag, {
    String? id,
  }) {
    return _attributeParser.parse<R>(
      type,
      json,
      tag,
      id: id,
    );
  }
}