Flutter 快捷键 和 插件使用

import 'dart:convert';
class Test {
  final String title;
  final bool status;
  final int num;
  Test({
    required this.title,
    required this.status,
    required this.num,
  });
  Test copyWith({
    String? title,
    bool? status,
    int? num,
  }) {
    return Test(
      title: title ?? this.title,
      status: status ?? this.status,
      num: num ?? this.num,
    );
  }
  Map<String, dynamic> toMap() {
    return {
      'title': title,
      'status': status,
      'num': num,
    };
  }
  factory Test.fromMap(Map<String, dynamic> map) {
    return Test(
      title: map['title'] ?? '',
      status: map['status'] ?? false,
      num: map['num']?.toInt() ?? 0,
    );
  }
  String toJson() => json.encode(toMap());
  factory Test.fromJson(String source) => Test.fromMap(json.decode(source));
  @override
  String toString() => 'Test(title: $title, status: $status, num: $num)';
  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;
    return other is Test &&
      other.title == title &&
      other.status == status &&
      other.num == num;
  }
  @override
  int get hashCode => title.hashCode ^ status.hashCode ^ num.hashCode;
}