fis_lib_measure/lib/interfaces/process/layout/section.dart

import 'unit.dart';

class LayoutSection {
  String _key = '';
  List<LayoutUnit>? _layouts;

  String get key => _key;
  List<LayoutUnit> get layouts => _layouts ?? const [];

  LayoutSection();

  factory LayoutSection.fromJson(Map<String, dynamic> map) {
    final instance = LayoutSection();
    instance._key = map['n'] ?? '';
    instance._loadLayoutUnits(map['Layouts']);
    return instance;
  }

  void _loadLayoutUnits(dynamic data) {
    final List<LayoutUnit> arr = [];

    if (data != null && data is List) {
      final List<dynamic> jArr = data;
      for (final item in jArr) {
        arr.add(LayoutUnit.fromJson(item));
      }
    }
    if (arr.isEmpty) {
      throw ArgumentError(
          "Layout configuration error: Layout element not found.");
    }
    _layouts = arr;
  }
}