[移动开发]Flutter的showDialog(3)

1、model

class MultiPickData {
  String id;
  List<MultiPickData> children;
  String name;

  MultiPickData(this.id, this.children, this.name);

  @override
  toString() => 'id: $id';

  MultiPickData.fromJson(Map<String, dynamic> json) {
    id = json['id']?.toString();
    name = json['name']?.toString();
    if (json['children'] != null) {
      children = [];
      children.addAll((json['children'] as List)
          .map((m) => MultiPickData.fromJson(m))
          .toList());
    }
  }
  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['id'] = this.id;
    data['name'] = this.name;
    if (this.children != null) {
      data['children'] = this.children.map((v) => v.toJson()).toList();
    }
    return data;
  }
}

2、json数据

[
    {
        "id":"1",
        "name":"1楼",
        "children":[
            {
                "id":"0",
                "name":"输入区",
                "children":[
                    {
                        "id":"00",
                        "name":"A1",
                        "children":[]
                    },
                    {
                        "id":"01",
                        "name":"A2",
                        "children":[]
                    },
                    {
                        "id":"02",
                        "name":"A3",
                        "children":[]
                    },
                    {
                        "id":"03",
                        "name":"A4",
                        "children":[]
                    }
                ]
            },
            {
                "id":"1",
                "name":"入库区",
                "children":[
                    {
                        "id":"10",
                        "name":"B1",
                        "children":[]
                    },
                    {
                        "id":"11",
                        "name":"B2",
                        "children":[]
                    }
                ]
            },
            {
                "id":"2",
                "name":"大箱上线区",
                "children":[
                    {
                        "id":"20",
                        "name":"C1",
                        "children":[]
                    },
                    {
                        "id":"21",
                        "name":"C2",
                        "children":[]
                    },
                    {
                        "id":"22",
                        "name":"C3",
                        "children":[]
                    },
                    {
                        "id":"23",
                        "name":"C4",
                        "children":[]
                    }
                ]
            }
        ]
    },
    {
        "id":"2",
        "name":"2楼",
        "children":[
            {
                "id":"0",
                "name":"输入区",
                "children":[
                    {
                        "id":"00",
                        "name":"A1",
                        "children":[]
                    },
                    {
                        "id":"01",
                        "name":"A2",
                        "children":[]
                    },
                    {
                        "id":"02",
                        "name":"A3",
                        "children":[]
                    },
                    {
                        "id":"03",
                        "name":"A4",
                        "children":[]
                    }
                ]
            },
            {
                "id":"1",
                "name":"入库区",
                "children":[
                    {
                        "id":"10",
                        "name":"B1",
                        "children":[]
                    },
                    {
                        "id":"11",
                        "name":"B2",
                        "children":[]
                    }
                ]
            },
            {
                "id":"2",
                "name":"大箱上线区",
                "children":[
                    {
                        "id":"20",
                        "name":"C1",
                        "children":[]
                    },
                    {
                        "id":"21",
                        "name":"C2",
                        "children":[]
                    },
                    {
                        "id":"22",
                        "name":"C3",
                        "children":[]
                    },
                    {
                        "id":"23",
                        "name":"C4",
                        "children":[]
                    }
                ]
            }
        ]
    }
]