Method items

packages/designer/src/document/node/props/prop.ts:162–206

* 构造 items 属性，同时构造 maps 属性

()

   * 构造 items 属性，同时构造 maps 属性
   */
  private get items(): IProp[] | null {
    if (this._items) return this._items;
    return runInAction(() => {
      let items: IProp[] | null = null;
      if (this._type === 'list') {
        const maps = new Map<string, IProp>();
        const data = this._value;
        data.forEach((item: any, idx: number) => {
          items = items || [];
          let prop;
          if (this._maps?.has(idx.toString())) {
            prop = this._maps.get(idx.toString())!;
            prop.setValue(item);
          } else {
            prop = new Prop(this, item, idx);
          }
          maps.set(idx.toString(), prop);
          items.push(prop);
        });
        this._maps = maps;
      } else if (this._type === 'map') {
        const data = this._value;
        const maps = new Map<string, IProp>();
        const keys = Object.keys(data);
        for (const key of keys) {
          let prop: IProp;
          if (this._maps?.has(key)) {
            prop = this._maps.get(key)!;
            prop.setValue(data[key]);
          } else {
            prop = new Prop(this, data[key], key);
          }
          items = items || [];
          items.push(prop);
          maps.set(key, prop);
        }
        this._maps = maps;
      } else {
        items = null;
        this._maps = null;
      }
      this._items = items;
      return this._items;
    });
  }

  @computed private get maps(): Map<string | number, IProp> | null {
    if (!this.items) {