fast_mvvm

Description:

fast mvvm

fast_mvvm #
博客讲解：https://blog.csdn.net/q948182974/article/details/106613565
掘金讲解：https://juejin.im/post/5ee86c9b51882543313a0de7
一个MVVM框架附带简单的demo,会一直更新，希望支持一下.有问题可以反馈QQ 275918180。
Demo 讲解 #
这里模拟了文章列表。
Model：UserModel
BaseListViewModel： ArticleVM
View：ArticlePage
数据实体类 BaseEntity：ArticleEntity
主要讲解了初始化配置， 状态页效果，根布局刷新，数据获取。
UserModel #
首先创建项目模块所需要用的Model，按大模块区分。
这里创建UserModel。
class UserModel extends BaseModel {
/// 登录
Future<bool> login(String account, String psd) async {
await Future.delayed(Duration(seconds: 3));
return true;
}

/// 资讯列表
Future<DataResponse<ArticleEntity>> getArticleList() async {
await Future.delayed(Duration(seconds: 2));

var entity = ArticleEntity([
ArticleItem("1", "好的", "内容内容内容内容内容", DateTime.now().toString()),
ArticleItem("1", "好的", "内容内容内容内容内容", DateTime.now().toString()),
]);

DataResponse dataResponse =
DataResponse<ArticleEntity>(entity: entity, totalPageNum: 3);
return dataResponse;
}
}
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初始化 #
在APP首页启动的时候初始化框架。
调用initMVVM(),装载UserModel，配置上拉加载下拉刷新;
选择文章页面是否根布局刷新选项,是否配置单独的状态页。

class App extends StatefulWidget {
@override
_AppState createState() => _AppState();
}

class _AppState extends State<App> {
@override
void initState() {
initMVVM<BaseViewModel>(
[UserModel()],
controllerBuild: () => EasyRefreshController(),
resetRefreshState: (c) =>
(c as EasyRefreshController)?.resetRefreshState(),
finishRefresh: (c, {bool success, bool noMore}) =>
(c as EasyRefreshController)
?.finishRefresh(success: success, noMore: noMore),
resetLoadState: (c) => (c as EasyRefreshController)?.resetLoadState(),
finishLoad: (c, {bool success, bool noMore}) =>
(c as EasyRefreshController)
?.finishLoad(success: success, noMore: noMore),
);
super.initState();
}

@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: SelectPage(),
);
}
}

class SelectVM extends BaseViewModel {
ValueNotifier<bool> isLoadData = ValueNotifier(true);
ValueNotifier<bool> isConfigState = ValueNotifier(false);
}

class SelectPage extends StatelessWidget with BaseView<SelectVM> {
@override
ViewConfig<SelectVM> initConfig(BuildContext context) =>
ViewConfig(vm: SelectVM());

@override
Widget vmBuild(
BuildContext context, SelectVM vm, Widget child, Widget state) {
return Scaffold(
appBar: AppBar(title: Text("选择")),
body: ListView(
children: <Widget>[
ListTile(
title: Text("是否加载数据,用来测试状态页和重新加载数据"),
trailing: ValueListenableBuilder(
valueListenable: vm.isLoadData,
builder: (_, value, __) => Switch(
value: value,
onChanged: (value) => vm.isLoadData.value = value,
),
),
),
ListTile(
title: Text("是否单独配置状态页,用来测试状态页和重新加载数据"),
trailing: ValueListenableBuilder(
valueListenable: vm.isConfigState,
builder: (_, value, __) => Switch(
value: value,
onChanged: (value) => vm.isConfigState.value = value,
),
),
),
ListTile(
title: Text("根布局刷新"),
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (_) => ArticlePage(
true,
configState: vm.isConfigState.value,
loadData: vm.isLoadData.value,
),
),
);
},
),
ListTile(
title: Text("根布局不刷新"),
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (_) => ArticlePage(
false,
configState: vm.isConfigState.value,
loadData: vm.isLoadData.value,
),
),
);
},
),
],
),
);
}
}
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ArticleEntity #
模拟接口返回的数据实体类：
class ArticleEntity extends BaseEntity {
List<ArticleItem> list;

ArticleEntity(this.list);
}

class ArticleItem {
String id;
String title;
String content;
String time;

ArticleItem(this.id, this.title, this.content, this.time);
}
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ArticleVM #
UserModel 继承 BaseModel，ArticleEntity继承BaseEntity，ArticleItem 暂没要求。
是否首次加载数据测试空状态页的效果
创建vnTime 用来监听List第一个ArticleItem的时间刷新

class ArticleVM
extends BaseListViewModel<UserModel, ArticleEntity, ArticleItem> {
ArticleVM(this.isLoadData);
bool isLoadData = true;

/// 首次加载
bool firstLoad = true;
ValueNotifier<String> vnTime = ValueNotifier("暂无");

@override
void jointList(ArticleEntity newEntity) => entity.list.addAll(newEntity.list);

@override
List<ArticleItem> get list => entity.list;
@override
Future<DataResponse<ArticleEntity>> requestHttp(
{bool isLoad, int page, params}) {
/// 判断是否加载数据， 测试状态页用
if (!isLoadData && firstLoad) {
firstLoad = false;
return null;
}
return model.getArticleList();
}

@override
void initResultData() {
vnTime.value = list[0].time;
}

/// 修改第一个数据的时间
void modifyFistTime() {
list[0].time = DateTime.now().toString();
vnTime.value = list[0].time;
notifyListeners();
}
}
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ArticlePage View #
文章具体页面，显示一个列表，下方显示第一个item对应的时间，和根布局刷新的时间。
class ArticlePage extends StatelessWidget with BaseView<ArticleVM> {
const ArticlePage(
this.rootRefresh, {
Key key,
this.configState = false,
this.loadData = true,
}) : super(key: key);

/// 是否全局刷新
final bool rootRefresh;
final bool configState;
final bool loadData;

@override
ViewConfig<ArticleVM> initConfig(BuildContext context) {
var _empty = configState ? (vm) => Center(child: Text("单独配置：empty")) : null;
return rootRefresh
? ViewConfig<ArticleVM>(vm: ArticleVM(loadData), empty: _empty)
: ViewConfig<ArticleVM>.noRoot(vm: ArticleVM(loadData), empty: _empty);
}

@override
Widget vmBuild(
BuildContext context, ArticleVM vm, Widget child, Widget state) {
return Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(title: Text("文章")),
bottomNavigationBar: state != null
? SizedBox()
: Container(
color: Colors.amber,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
MaterialButton(
onPressed: vm.modifyFistTime,
color: Colors.white,
child: Text("修改第一个Item时间,测试全局刷新"),
),
ValueListenableBuilder<String>(
valueListenable: vm.vnTime,
builder: (_, value, __) {
return Text("第一个Item时间：$value");
},
),
Text("根布局刷新时间：${DateTime.now().toString()}"),
],
),
),
body: state ??
EasyRefresh(
controller: vm.refreshController,
onLoad: vm.loadMore,
onRefresh: vm.pullRefresh,
child: ListView.builder(
itemCount: vm.list.length,
itemBuilder: (ctx, index) {
return Selector<ArticleVM, ArticleItem>(
selector: (_, aVM) => aVM.list[index],
shouldRebuild: (pre, next) => pre == next,
builder: (_, ArticleItem value, __) => _item(value),
);
},
),
),
);
}

Widget _item(ArticleItem item) {
return Container(
color: Colors.lightGreen,
margin: EdgeInsets.all(8),
padding: EdgeInsets.all(4),
child: Column(
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(item.title),
Text(item.time),
],
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Text(item.content),
),
],
),
);
}
}
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数据刷新 #
通过ValueListenableBuilder 监听在ArticleVM创建的ValueNotifier 对象，实现局部刷新。
通过Selector 监听ArticleEntity中List 的 ArticleItem 的变化
ValueListenableBuilder<String>(
valueListenable: vm.vnTime,
builder: (_, value, __) {
return Text("第一个Item时间：$value");
},
)
Selector<ArticleVM, ArticleItem>(
selector: (_, aVM) => aVM.list[index],
shouldRebuild: (pre, next) => pre == next,
builder: (_, ArticleItem value, __) => _item(value),
)
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更多帮助 #
博客讲解：https://blog.csdn.net/q948182974/article/details/106613565
掘金讲解：https://juejin.im/post/5ee86c9b51882543313a0de7
一个MVVM框架附带简单的demo,会一直更新，希望支持一下.有问题可以反馈QQ 275918180。