fis_lib_measure/lib/interfaces/process/items/item.dart

import 'package:fis_common/event/event_type.dart';
import 'package:fis_measure/interfaces/enums/items.dart';

import '../calculators/calculator.dart';
import '../workspace/point_info.dart';
import 'item_feature.dart';
import 'item_metas.dart';

abstract class IMeasureItem {
  /// 标签信息
  ItemMeta get meta;

  /// 外显名称
  String get displayName;

  /// 描述
  String get description;

  /// 简短描述
  String get briefAnnotation;

  /// 测量快照
  IMeasureItemFeature? get feature;

  /// 已完成测量记录
  List<IMeasureItemFeature> get measuredFeatures;

  /// 计算器
  ICalculator? get calculator;

  /// 父级
  IMeasureItem? get parent;

  /// 测量状态
  ItemStates get state;

  /// 显示像素/图片像素 缩放比例
  double get scaleRatio;

  /// 处理输入
  bool execute(PointInfo args);

  /// 清空
  void clear();

  /// 完成一次测量
  void finishOnce();

  /// 取消一次测量
  void cancelOnce();

  /// 分配新序号
  int assignId();

  /// 快照变化事件
  late final FEventHandler<IMeasureItemFeature?> featureUpdated;
}

/// 组合(包含子项)测量项
abstract class ITopMeasureItem implements IMeasureItem {
  /// 子项集合
  List<IMeasureItem> get childItems;

  /// 工作中子项
  IMeasureItem get workingChild;

  /// 工作子项变更事件
  late final FEventHandler<int> workingChildChanged;

  /// 切换制定子项为工作状态
  void switchChild(int index);
}