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Merge pull request #18 from FlutterOpen/dev
feat(): 命令模式的完成
2 parents b347089 + 58640bc commit 0c80891

5 files changed

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‎lib/constant/string_const.dart‎

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@@ -43,4 +43,7 @@ class StringConst {
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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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//命令模式
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static const String COMMAND_ = "责任链模式";
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}

‎lib/main.dart‎

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@@ -3,6 +3,7 @@ import 'package:flutter_design/constant/string_const.dart';
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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/command/command_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';
@@ -41,6 +42,7 @@ class MyApp extends StatelessWidget {
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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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PageConst.COMMAND_PAGE: (context) => CommandPage(),
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},
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);
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}

‎lib/page/command/command_mode.dart‎

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import 'package:flutter/cupertino.dart';
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/// Created by NieBin on 2020-03-31
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/// Github: https://github.com/nb312
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/// Email: niebin312@gmail.com
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//接收角色
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class AudioPlayer {
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void play() {
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debugPrint("播放音乐");
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}
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void stop() {
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debugPrint("停止播放音乐");
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}
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void pause() {
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debugPrint("暂停播放音乐");
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}
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void nextPlay() {
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debugPrint("播放下一首");
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}
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}
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//命令角色
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abstract class Command {
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void execute();
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}
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class PlayCommand implements Command {
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AudioPlayer player;
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PlayCommand(this.player);
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@override
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void execute() {
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player?.play();
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}
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}
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class StopCommand implements Command {
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AudioPlayer player;
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StopCommand(this.player);
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@override
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void execute() {
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player?.stop();
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}
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}
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class PauseCommand implements Command {
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AudioPlayer player;
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PauseCommand(this.player);
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@override
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void execute() {
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player?.pause();
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}
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}
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class NextCommand implements Command {
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AudioPlayer player;
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NextCommand(this.player);
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@override
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void execute() {
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player?.nextPlay();
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}
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}
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//手势调用命令
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class PointerInvoker {
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Command _command;
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set command(Command command) => _command = command;
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void execute() {
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_command.execute();
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}
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}

‎lib/page/command/command_page.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/command/command_mode.dart';
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/// Created by NieBin on 2020-03-31
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/// Github: https://github.com/nb312
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/// Email: niebin312@gmail.com
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class CommandPage extends StatefulWidget {
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@override
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_CommandPageState createState() => _CommandPageState();
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}
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class _CommandPageState extends State<CommandPage> {
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AudioPlayer _player;
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@override
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initState() {
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super.initState();
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_player = AudioPlayer();
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}
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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.COMMAND_),
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),
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body: Container(
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alignment: Alignment.center,
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child: Row(
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crossAxisAlignment: CrossAxisAlignment.center,
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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_button(
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icon: Icons.pause,
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callback: () {
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PointerInvoker invoker = PointerInvoker();
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invoker.command = PauseCommand(_player);
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invoker.execute();
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},
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color: Colors.red),
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_button(
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icon: Icons.stop,
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callback: () {
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PointerInvoker invoker = PointerInvoker();
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invoker.command = StopCommand(_player);
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invoker.execute();
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},
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color: Colors.red),
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_button(
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icon: Icons.play_arrow,
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callback: () {
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PointerInvoker invoker = PointerInvoker();
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invoker.command = PlayCommand(_player);
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invoker.execute();
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},
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color: Colors.red),
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_button(
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icon: Icons.skip_next,
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callback: () {
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PointerInvoker invoker = PointerInvoker();
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invoker.command = NextCommand(_player);
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invoker.execute();
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},
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color: Colors.green),
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],
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),
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),
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);
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}
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Widget _button({
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IconData icon,
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VoidCallback callback,
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Color color = Colors.white,
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}) =>
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FlatButton(
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color: color,
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child: Padding(
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padding: const EdgeInsets.all(10.0),
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child: Icon(
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icon,
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size: 30,
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),
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),
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onPressed: callback,
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shape: CircleBorder(),
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);
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}

‎lib/page/home_page.dart‎

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@@ -28,6 +28,7 @@ Map<String, String> map = {
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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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PageConst.COMMAND_PAGE: StringConst.COMMAND_,
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};
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class _HomePageState extends State<HomePage> {

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