feat(): 享元模式的完成

Author: 聂彬

README.md

@@ -14,4 +14,5 @@
 7. 过滤器/标准模式
 8. 组合模式
 9. 装饰者模式
-10. 外观/门面模式
+10. 外观/门面模式
+11. 享元模式

lib/constant/string_const.dart

@@ -34,4 +34,7 @@ class StringConst {
 
   //外观模式
   static const String FACADE_ = "外观模式";
+
+  //享元模式
+  static const String FLYWEIGHT_ = "享元模式";
 }

lib/main.dart

@@ -6,6 +6,7 @@ import 'package:flutter_design/page/combination/combination_page.dart';
 import 'package:flutter_design/page/decorator/decorator_page.dart';
 import 'package:flutter_design/page/facade/facade_page.dart';
 import 'package:flutter_design/page/filter/filter_page.dart';
+import 'package:flutter_design/page/flyweight/flyweight_page.dart';
 
 import 'constant/page_const.dart';
 import 'constant/string_const.dart';
@@ -35,6 +36,7 @@ class MyApp extends StatelessWidget {
         PageConst.COMPOSITE_PAGE: (context) => CombinationPage(),
         PageConst.DECORATOR_PAGE: (context) => DecoratorPage(),
         PageConst.FACADE_PAGE: (context) => FacadePage(),
+        PageConst.FLYWEIGHT_PAGE: (context) => FlyweightPage(),
       },
     );
   }

lib/page/flyweight/flyweight_mode.dart

@@ -0,0 +1,106 @@
+import 'dart:collection';
+
+import 'package:flutter/material.dart';
+
+/// Created by NieBin on 2020-03-26
+/// Github: https://github.com/nb312
+/// Email: niebin312@gmail.com
+abstract class Clock {
+  Color color;
+
+  Widget display();
+}
+
+class PinkClock implements Clock {
+  @override
+  Color color = Colors.pink;
+
+  @override
+  Widget display() => Container(
+        width: 100,
+        height: 100,
+        decoration: BoxDecoration(
+          shape: BoxShape.rectangle,
+          border: Border.all(color: Colors.green),
+          color: color,
+        ),
+        child: Center(child: Text(DateTime.now().toIso8601String())),
+      );
+}
+
+class GreenClock implements Clock {
+  @override
+  Color color = Colors.green;
+
+  @override
+  Widget display() => Container(
+        width: 200,
+        height: 100,
+        decoration: BoxDecoration(shape: BoxShape.circle, color: color),
+        child: Center(child: Text(DateTime.now().toIso8601String())),
+      );
+}
+
+class BlueClock implements Clock {
+  @override
+  Color color = Colors.blue;
+
+  @override
+  Widget display() => Container(
+        width: 150,
+        height: 150,
+        decoration: BoxDecoration(shape: BoxShape.circle, color: color),
+        child: Center(child: Text(DateTime.now().toIso8601String())),
+      );
+}
+
+class WhiteClock implements Clock {
+  @override
+  Color color = Colors.white;
+
+  @override
+  Widget display() => Container(
+        width: 100,
+        height: 100,
+        decoration: BoxDecoration(
+            shape: BoxShape.rectangle,
+            color: color,
+            border: Border.all(color: Colors.orangeAccent)),
+        child: Center(child: Text(DateTime.now().toIso8601String())),
+      );
+}
+
+class ClockManager {
+  static Map<String, Clock> _clocks = HashMap();
+
+  static Clock getColorClock(String color) {
+    if (_clocks.containsKey(color)) {
+      return _clocks[color];
+    } else {
+      _clocks.putIfAbsent(color, () {
+        if (color.toLowerCase() == "pink") {
+          return PinkClock();
+        } else if (color.toLowerCase() == "green") {
+          return GreenClock();
+        } else if (color.toLowerCase() == "blue") {
+          return BlueClock();
+        } else {
+          return WhiteClock();
+        }
+      });
+      return _clocks[color];
+    }
+  }
+
+  static Clock removeClock(String color) {
+    if (_clocks.containsKey(color)) {
+      return _clocks.remove(color);
+    } else {
+      return null;
+    }
+  }
+
+  static void clearAll() {
+    _clocks.clear();
+  }
+}

lib/page/flyweight/flyweight_page.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_design/constant/string_const.dart';
+import 'package:flutter_design/page/flyweight/flyweight_mode.dart';
+
+/// Created by NieBin on 2020-03-26
+/// Github: https://github.com/nb312
+/// Email: niebin312@gmail.com
+
+class FlyweightPage extends StatefulWidget {
+  @override
+  _FlyweightPageState createState() => _FlyweightPageState();
+}
+
+class _FlyweightPageState extends State<FlyweightPage> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(StringConst.FLYWEIGHT_),
+      ),
+      body: Container(
+        child: Center(
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            crossAxisAlignment: CrossAxisAlignment.center,
+            children: <Widget>[
+              ClockManager.getColorClock("pink").display(),
+              SizedBox(height: 10,),
+              ClockManager.getColorClock("green").display(),
+              SizedBox(height: 10,),
+              ClockManager.getColorClock("blue").display(),
+              SizedBox(height: 10,),
+              ClockManager.getColorClock("12423").display(),
+              SizedBox(height: 10,)
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/page/home_page.dart

@@ -25,6 +25,7 @@ Map<String, String> map = {
   PageConst.COMPOSITE_PAGE: StringConst.COMBINATION_,
   PageConst.DECORATOR_PAGE: StringConst.DECORATOR_,
   PageConst.FACADE_PAGE: StringConst.FACADE_,
+  PageConst.FLYWEIGHT_PAGE: StringConst.FLYWEIGHT_,
 };
 
 class _HomePageState extends State<HomePage> {