Flutter 所有状态类中具有一个共同属性的颤振集团可平衡状态

我正试图找出定义搜索区状态的最佳方法，以便在所有状态类中保留

text

属性（搜索键）

目前看起来是这样的：

import 'package:equatable/equatable.dart';
import 'package:project/models/searchResults.dart';

class SearchState extends Equatable {
  SearchState([List props = const []]) : super(props);
}

class SearchStateEmpty extends SearchState {
  final String text;
  SearchStateEmpty({this.text});
  @override
  String toString() => 'SearchStateEmpty';
}

class SearchStateLoading extends SearchState {
  final String text;
  SearchStateLoading({this.text});
  @override
  String toString() => 'SearchStateLoading';
}

class SearchStateSuccess extends SearchState {
  final String text;
  final List<RestaurantSearchItem> items;

  SearchStateSuccess({this.text, this.items}) : super([text, items]);

  @override
  String toString() => 'SearchStateSuccess { items: ${items.length} }';
}

class SearchStateError extends SearchState {
  final String text;
  final String error;

  SearchStateError({this.text, this.error}) : super([text, error]);

  @override
  String toString() => 'SearchStateError';
}

class SearchState extends Equatable {
  final String text;
  SearchState(this.text,
      [List<RestaurantSearchItem> items = const [], String error = ''])
      : super([text, items, error]);
}

class SearchStateEmpty extends SearchState {
  SearchStateEmpty({String text})
      : super(text); // Here I want to use text from SearchState

  SearchStateEmpty.fromState(SearchState state) : super(state.text);

  @override
  String toString() => 'SearchStateEmpty';
}

class SearchStateLoading extends SearchState {
  final String text;

  SearchStateLoading({this.text})
      : super(text); // Here I  want to set text that comes from event

  @override
  String toString() => 'SearchStateLoading';
}

class SearchStateError extends SearchState {
  final String error;

  SearchStateError({this.error, String text}) : super(text, [], error);
  // Text comes from SearchState, error comes from event

  SearchStateError.fromState(SearchState state, {this.error})
      : super(state.text, [], error);

  @override
  String toString() => 'SearchStateError';
}

class SearchStateSuccess extends SearchState {
  final List<RestaurantSearchItem> items;

  SearchStateSuccess({this.items, String text}) : super(text, items, null);

  SearchStateSuccess.fromState(SearchState state, {this.items})
      : super(state.text, items, null);

  @override
  String toString() => 'SearchStateSuccess { items: ${items.length} }';
}

我在Flutter文档中寻找示例，但我所能找到的是，我要么使用不同的bloc，要么放弃

equalable

（我想保留它，因为拥有它非常好）

---

如有任何示例性建议，将不胜感激。谢谢。

我当时的做法有点反模式。在一些帮助下，我能够找到一种更干净的方法在状态类中使用当前状态

代码现在如下所示：

import 'package:equatable/equatable.dart';
import 'package:project/models/searchResults.dart';

class SearchState extends Equatable {
  SearchState([List props = const []]) : super(props);
}

class SearchStateEmpty extends SearchState {
  final String text;
  SearchStateEmpty({this.text});
  @override
  String toString() => 'SearchStateEmpty';
}

class SearchStateLoading extends SearchState {
  final String text;
  SearchStateLoading({this.text});
  @override
  String toString() => 'SearchStateLoading';
}

class SearchStateSuccess extends SearchState {
  final String text;
  final List<RestaurantSearchItem> items;

  SearchStateSuccess({this.text, this.items}) : super([text, items]);

  @override
  String toString() => 'SearchStateSuccess { items: ${items.length} }';
}

class SearchStateError extends SearchState {
  final String text;
  final String error;

  SearchStateError({this.text, this.error}) : super([text, error]);

  @override
  String toString() => 'SearchStateError';
}

class SearchState extends Equatable {
  final String text;
  SearchState(this.text,
      [List<RestaurantSearchItem> items = const [], String error = ''])
      : super([text, items, error]);
}

class SearchStateEmpty extends SearchState {
  SearchStateEmpty({String text})
      : super(text); // Here I want to use text from SearchState

  SearchStateEmpty.fromState(SearchState state) : super(state.text);

  @override
  String toString() => 'SearchStateEmpty';
}

class SearchStateLoading extends SearchState {
  final String text;

  SearchStateLoading({this.text})
      : super(text); // Here I  want to set text that comes from event

  @override
  String toString() => 'SearchStateLoading';
}

class SearchStateError extends SearchState {
  final String error;

  SearchStateError({this.error, String text}) : super(text, [], error);
  // Text comes from SearchState, error comes from event

  SearchStateError.fromState(SearchState state, {this.error})
      : super(state.text, [], error);

  @override
  String toString() => 'SearchStateError';
}

class SearchStateSuccess extends SearchState {
  final List<RestaurantSearchItem> items;

  SearchStateSuccess({this.items, String text}) : super(text, items, null);

  SearchStateSuccess.fromState(SearchState state, {this.items})
      : super(state.text, items, null);

  @override
  String toString() => 'SearchStateSuccess { items: ${items.length} }';
}

类SearchState扩展了equalable{
最终字符串文本；
SearchState（this.text，
[列表项=常量[]，字符串错误=“”]）
：super（[文本、项目、错误]）；
}
类SearchStateEmpty扩展了SearchState{
SearchStateEmpty（{String text}）
：super（text）；//这里我想使用SearchState中的文本
searchstatempty.fromState（SearchState状态）：super（state.text）；
@凌驾
字符串toString（）=>“SearchStateEmpty”；
}
类SearchStateLoading扩展了SearchState{
最终字符串文本；
SearchStateLoading（{this.text}）
：super（text）；//这里我想设置来自事件的文本
@凌驾
字符串toString（）=>“SearchStateLoading”；
}
类SearchStateError扩展了SearchState{
最终字符串错误；
SearchStateError（{this.error，String text}）：超级（text，[]，error）；
//文本来自SearchState，错误来自事件
SearchStateError.fromState（SearchState状态，{this.error}）
：super（state.text，[]，error）；
@凌驾
字符串toString（）=>“SearchStateError”；
}
类SearchState成功扩展了SearchState{
最后清单项目；
SearchStateSuccess（{this.items，String text}）：超级（text，items，null）；
SearchStateSuccess.fromState（SearchState状态，{this.items}）
：super（state.text，items，null）；
@凌驾
String-toString（）=>'SearchStateSucture{items:${items.length}}'；
}

你能解释一下你所在州的入境点是什么吗？我有一些相同的用例，但是我需要的属性来自一个不同的集团，我订阅了它，但不确定在初始状态调用之后如何实例化它？这不是最好的模式。但是，当您需要在不同的状态之间共享同一属性时，您可以使用它，而无需在每次更改状态时设置它。