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Merge pull request #17 from FlutterOpen/dev
feat(): 完成责任链模式
2 parents f99a156 + c9e2c22 commit b347089

7 files changed

Lines changed: 155 additions & 2 deletions

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‎README.md‎

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@@ -19,4 +19,4 @@
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12. 代理模式
2020

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### 行为型模式
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待添加
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13. 责任链模式

‎lib/constant/page_const.dart‎

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@@ -18,7 +18,7 @@ class PageConst {
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static const String CHAIN_PAGE = "/chain"; //享元模式
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static const String COMMAND_PAGE = "/command"; //命令模式
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static const String INTERPRETER_PAGE = "/interpreter"; //解释器模式
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static const String ITERATOR_PAGE = "/interpreter"; //解释器模式
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static const String DUTY_PAGE = "/duty"; //责任链模式
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static const String MEDIATOR_PAGE = "/mediator"; //中介者模式
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static const String MEMENTO_PAGE = "/memento"; //备忘录模式
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static const String OBSERVER_PAGE = "/observer"; //观察者模式

‎lib/constant/string_const.dart‎

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@@ -40,4 +40,7 @@ class StringConst {
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//享元模式
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static const String PROXY_ = "代理模式";
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//享元模式
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static const String DUTY_ = "责任链模式";
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}

‎lib/main.dart‎

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@@ -4,6 +4,7 @@ import 'package:flutter_design/page/adapter/adapter_page.dart';
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import 'package:flutter_design/page/bridge/bridge_page.dart';
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import 'package:flutter_design/page/combination/combination_page.dart';
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import 'package:flutter_design/page/decorator/decorator_page.dart';
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import 'package:flutter_design/page/duty/duty_page.dart';
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import 'package:flutter_design/page/facade/facade_page.dart';
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import 'package:flutter_design/page/filter/filter_page.dart';
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import 'package:flutter_design/page/flyweight/flyweight_page.dart';
@@ -39,6 +40,7 @@ class MyApp extends StatelessWidget {
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PageConst.FACADE_PAGE: (context) => FacadePage(),
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PageConst.FLYWEIGHT_PAGE: (context) => FlyweightPage(),
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PageConst.PROXY_PAGE: (context) => ProxyPage(),
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PageConst.DUTY_PAGE: (context) => DutyPage(),
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},
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);
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}

‎lib/page/duty/duty_mode.dart‎

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/// Created by NieBin on 2020-03-30
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/// Github: https://github.com/nb312
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/// Email: niebin312@gmail.com
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class MessageModel {
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final String message;
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final int level;
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MessageModel(this.message, this.level);
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}
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abstract class IHandler {
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static const int LEVEL_ONE = 1;
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static const int LEVEL_TWO = 2;
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static const int LEVEL_THREE = 3;
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int level = LEVEL_ONE;
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IHandler _nextHandler;
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IHandler(this.level);
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set nextHandler(IHandler handler) => _nextHandler = handler;
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void sendMessage(MessageModel model);
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void hand(MessageModel model) {
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if (model.level == level) {
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this.sendMessage(model);
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} else {
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if (_nextHandler != null) {
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print("正在发送到下一级");
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_nextHandler.hand(model);
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} else {
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//实在找不到人，先改下
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print("已经到达顶级了");
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this.sendMessage(model);
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}
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}
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}
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}
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class EarthHandler extends IHandler {
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EarthHandler() : super(IHandler.LEVEL_ONE);
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@override
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void sendMessage(MessageModel model) {
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print("我是地球，我已经收到: ${model.message}");
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}
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}
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class MoonHandler extends IHandler {
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MoonHandler() : super(IHandler.LEVEL_TWO);
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@override
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void sendMessage(MessageModel model) {
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print("我是月亮，我已经收到: ${model.message}");
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}
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}
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class SunHandler extends IHandler {
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SunHandler() : super(IHandler.LEVEL_THREE);
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@override
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void sendMessage(MessageModel model) {
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print("我是太阳，我已经收到: ${model.message}");
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}
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}

‎lib/page/duty/duty_page.dart‎

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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_design/constant/string_const.dart';
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import 'package:flutter_design/page/duty/duty_mode.dart';
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/// Created by NieBin on 2020-03-30
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/// Github: https://github.com/nb312
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/// Email: niebin312@gmail.com
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class DutyPage extends StatefulWidget {
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@override
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_DutyPageState createState() => _DutyPageState();
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}
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class _DutyPageState extends State<DutyPage> {
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IHandler _handler;
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text(StringConst.DUTY_),
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),
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body: Container(
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constraints: BoxConstraints.expand(),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.center,
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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FlatButton(
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onPressed: () {
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if (_handler == null) {
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_handler = EarthHandler();
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IHandler moon = MoonHandler();
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IHandler sun = SunHandler();
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moon.nextHandler = sun;
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_handler.nextHandler = moon;
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print("初始化成功");
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} else {
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print("你已经初始化");
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}
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},
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color: Colors.yellow,
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child: Padding(
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padding: const EdgeInsets.all(10.0),
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child: Text("初始化"),
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),
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),
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SizedBox(height: 10),
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FlatButton(
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onPressed: () {
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MessageModel model = MessageModel("我爱地球", IHandler.LEVEL_ONE);
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_handler.hand(model);
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},
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color: Colors.green,
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child: Text("发送信息给地球"),
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),
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SizedBox(height: 10),
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FlatButton(
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onPressed: () {
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MessageModel model = MessageModel("我爱月球", IHandler.LEVEL_TWO);
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_handler.hand(model);
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},
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color: Colors.blueGrey,
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child: Text("发送信息给月亮"),
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),
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SizedBox(height: 10),
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FlatButton(
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onPressed: () {
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MessageModel model =
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MessageModel("我爱太阳", IHandler.LEVEL_THREE);
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_handler.hand(model);
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},
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color: Colors.red,
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child: Text("发送信息给太阳"),
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),
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],
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)),
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);
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}
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}

‎lib/page/home_page.dart‎

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@@ -27,6 +27,7 @@ Map<String, String> map = {
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PageConst.FACADE_PAGE: StringConst.FACADE_,
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PageConst.FLYWEIGHT_PAGE: StringConst.FLYWEIGHT_,
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PageConst.PROXY_PAGE: StringConst.PROXY_,
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PageConst.DUTY_PAGE: StringConst.DUTY_,
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};
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class _HomePageState extends State<HomePage> {

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