feat(): 策略模式完成

Author: 聂彬

README.md

@@ -26,4 +26,5 @@
 17. 中介者模式
 18. 备忘录模式
 19. 观察者模式
-20. 状态模式
+20. 状态模式
+21. 策略模式

lib/constant/string_const.dart

@@ -59,9 +59,12 @@ class StringConst {
   //备忘录模式
   static const String MEMORY_ = "备忘录模式";
 
-  //备忘录模式
+  //观察者模式
   static const String OBSERVER_ = "观察者模式";
 
-  //备忘录模式
+  //状态模式
   static const String STATE_ = "状态模式";
+
+  //策略模式
+  static const String STRATEGY_ = "策略模式";
 }

lib/main.dart

@@ -16,6 +16,7 @@ import 'package:flutter_design/page/midd/mid_page.dart';
 import 'package:flutter_design/page/observer/observer_page.dart';
 import 'package:flutter_design/page/proxy/proxy_page.dart';
 import 'package:flutter_design/page/state/state_page.dart';
+import 'package:flutter_design/page/strategy/strategy_page.dart';
 
 import 'constant/page_const.dart';
 import 'constant/string_const.dart';
@@ -55,6 +56,7 @@ class MyApp extends StatelessWidget {
         PageConst.MEMENTO_PAGE: (context) => MemoryPage(),
         PageConst.OBSERVER_PAGE: (context) => ObserverPage(),
         PageConst.STATE_PAGE: (context) => StatePage(),
+        PageConst.STRATEGY_PAGE: (context) => StrategyPage(),
       },
     );
   }

lib/page/home_page.dart

@@ -35,6 +35,7 @@ Map<String, String> map = {
   PageConst.MEMENTO_PAGE: StringConst.MEMORY_,
   PageConst.OBSERVER_PAGE: StringConst.OBSERVER_,
   PageConst.STATE_PAGE: StringConst.STATE_,
+  PageConst.STRATEGY_PAGE: StringConst.STRATEGY_,
 };
 
 class _HomePageState extends State<HomePage> {

lib/page/strategy/strategy_mode.dart

@@ -0,0 +1,53 @@
+import 'package:flutter/cupertino.dart';
+
+/// Created by NieBin on 2020-04-15
+/// Github: https://github.com/nb312
+/// Email: niebin312@gmail.com
+abstract class IMove {
+  void run();
+}
+
+class Fly extends IMove {
+  @override
+  void run() {
+    debugPrint("我用飞的不香吗");
+  }
+}
+
+//
+class Run extends IMove {
+  @override
+  void run() {
+    debugPrint("跑步使我快乐");
+  }
+}
+
+class Walk extends IMove {
+  @override
+  void run() {
+    debugPrint("散散步也不无不行");
+  }
+}
+
+class ByBike extends IMove {
+  @override
+  void run() {
+    debugPrint("骑行也是很环保的");
+  }
+}
+
+class ByBus extends IMove {
+  @override
+  void run() {
+    debugPrint("还是老司机开车快点");
+  }
+}
+
+class Context implements IMove {
+  IMove move;
+
+  @override
+  void run() {
+    move?.run();
+  }
+}

lib/page/strategy/strategy_page.dart

@@ -0,0 +1,93 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_design/page/strategy/strategy_mode.dart';
+
+/// Created by NieBin on 2020-04-15
+/// Github: https://github.com/nb312
+/// Email: niebin312@gmail.com
+
+class StrategyPage extends StatefulWidget {
+  @override
+  _StrategyPageState createState() => _StrategyPageState();
+}
+
+class _StrategyPageState extends State<StrategyPage> {
+  Context _context;
+
+  @override
+  void initState() {
+    _context = Context();
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("策略模式"),
+      ),
+      body: Container(
+        constraints: BoxConstraints.expand(),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.center,
+          children: <Widget>[
+            FlatButton(
+              color: Colors.red,
+              child: Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: Text("开始飞"),
+              ),
+              onPressed: () {
+                _context.move = Fly();
+                _context.run();
+              },
+            ),
+            FlatButton(
+              color: Colors.green,
+              child: Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: Text("开始跑"),
+              ),
+              onPressed: () {
+                _context.move = Run();
+                _context.run();
+              },
+            ),
+            FlatButton(
+              color: Colors.yellow,
+              child: Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: Text("开始散步"),
+              ),
+              onPressed: () {
+                _context.move = Walk();
+                _context.run();
+              },
+            ),
+            FlatButton(
+              color: Colors.blue,
+              child: Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: Text("开始骑行"),
+              ),
+              onPressed: () {
+                _context.move = ByBike();
+                _context.run();
+              },
+            ),
+            FlatButton(
+              color: Colors.orange,
+              child: Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: Text("开始开车"),
+              ),
+              onPressed: () {
+                _context.move = ByBus();
+                _context.run();
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}