feat:初始化工程
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lib/main.dart
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130
lib/main.dart
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import 'package:blog_app/test.dart';
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import 'package:flutter/material.dart';
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import 'package:markdown_widget/markdown_widget.dart';
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void main() {
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runApp(const MyApp());
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}
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class MyApp extends StatelessWidget {
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const MyApp({super.key});
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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home: Scaffold(
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appBar: AppBar(
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title: const Text('Markdown导航'),
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),
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body: const MarkdownWithToc(),
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),
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);
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}
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}
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class MarkdownWithToc extends StatefulWidget {
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const MarkdownWithToc({super.key});
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@override
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State<MarkdownWithToc> createState() => _MarkdownWithTocState();
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}
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class _MarkdownWithTocState extends State<MarkdownWithToc> {
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final tocController = TocController();
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bool _showToc = false;
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// ... markdownData 同上
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Widget _buildTocPanel() => AnimatedOpacity(
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opacity: _showToc ? 1.0 : 0.0,
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duration: const Duration(milliseconds: 300),
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child: Visibility(
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visible: _showToc,
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child: Align(
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alignment: Alignment.bottomRight,
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child: Container(
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width: 250,
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height: 400,
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margin: const EdgeInsets.only(bottom: 60, right: 60), // 调整位置在按钮左侧
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(12),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.2),
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blurRadius: 8,
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offset: const Offset(0, 4),
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),
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],
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border: Border.all(color: Colors.grey[300]!),
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),
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child: Column(
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children: [
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// 标题栏
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Container(
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padding: const EdgeInsets.all(12),
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decoration: BoxDecoration(
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color: Colors.grey[100],
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borderRadius: const BorderRadius.only(
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topLeft: Radius.circular(12),
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topRight: Radius.circular(12),
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),
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),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [
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const Text(
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'目录',
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style: TextStyle(
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fontWeight: FontWeight.bold,
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fontSize: 16,
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),
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),
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IconButton(
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icon: const Icon(Icons.close, size: 20),
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onPressed: () => setState(() => _showToc = false),
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),
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],
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),
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),
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Expanded(
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child: TocWidget(
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controller: tocController,
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),
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),
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],
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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 buildMarkdown() => MarkdownWidget(
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data: markdownData,
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tocController: tocController,
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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: const Text('文档'),
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),
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body: Stack(
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children: [
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// 主内容
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buildMarkdown(),
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// 悬浮TOC面板
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_buildTocPanel(),
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],
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),
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floatingActionButton: FloatingActionButton(
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onPressed: () => setState(() => _showToc = !_showToc),
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child: Icon(_showToc ? Icons.close : Icons.list),
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mini: true,
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backgroundColor: _showToc ? Colors.grey : Theme.of(context).primaryColor,
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),
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);
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}
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}
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109
lib/test.dart
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109
lib/test.dart
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final String markdownData = '''
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# 一、简介
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Spring Boot Starter是一组预定义的依赖项集合,旨在简化Maven或Gradle等构建工具中的依赖管理。每个Starter都包含了实现特定功能所需的库和组件,以及相应的配置文件。开发者只需在项目中引入相应的Starter依赖,即可快速搭建起具备该功能的项目骨架。
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Starter=依赖+自动配置+配置文件
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# 二、实现原理
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## 2.1 传统实现
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例如引入Spring中的jpa,则需要以下步骤:
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1. 在Maven中引入数据库依赖
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2. 在Maven中引入jpa依赖
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3. 在配置文件中配置属性
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4. 调试程序
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每次新建项目都需要重复此流程,操作繁琐。
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## 2.2 自定义Starter实现
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1. 新建Maven项目,在pom.xml文件中定义需要的依赖项。
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2. 创建自动配置类 AutoConfigurationTest,添加@configuration注解,使其能够被SpringBoot自动扫描到。
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3. 添加自动装配机制,在src/main/resources/META-INF文件夹下创建spring.factories文件,添加以下配置:
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```bash
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org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
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com.example.springbootstartercustom.AutoConfigurationTest
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```
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注:这里文件夹和文件名一定要正确,因此SpringFactoriesLoader中就是这么定义的。
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4. 在配置文件中自定义属性(可选)。
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5. 安装打包到maven仓库中。
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6. 其他项目通过pom.xml文件引入该starter。
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## 2.3 Starter实现原理
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加载依赖->扫描自动配置类->加载配置文件
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# 三、高级特性
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## 3.1 可插拔Starter
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所谓可插拔就是可以自行决定是否需要加载该starter的功能。例如可以通过注解的方式决定是否加载。
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1. 定义注解
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```java
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@Target(ElementType.TYPE)
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@Retention(RetentionPolicy.RUNTIME)
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public @interface EnableAutoConfigTest {
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}
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```
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2. 在自动配置类 AutoConfiguration中增加条件注解
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```java
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@Configuration
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@ConditionalOnBean(annotation = EnableAutoConfigTest.class)
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public class AutoConfigurationTest {
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}
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```
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3. 在相应位置添加@EnableAutoConfigTest注解该stater才会生效。
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## 3.2 自定义配置文件
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所谓自定义配置文件,就是可以在引入stater后,可以通过修改配置文件覆盖原来的配置属性,从而灵活配置stater功能。
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1. 引用spring-boot-configuration-processor
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```xml
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-configuration-processor</artifactId>
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<optional>true</optional>
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</dependency>
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```
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2. 定义Properties配置类
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```java
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@ConfigurationProperties(prefix = "test")
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public class TestProperties {
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private String name = "test";
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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}
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```
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3. 在自动配置类 AutoConfigurationTest中引用
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```java
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@Configuration(proxyBeanMethods = false)
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@Import({TestProperties.class})
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public class AutoConfigurationTest {
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@Resource
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private TestProperties testProperties;
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}
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```
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4. 在引入的stater工程中,修改配置文件:
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```yaml
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test:
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name: test1
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```
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''';
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