Flutter粘性分区列表插件flutter_sticky_section_list的使用

Flutter粘性分区列表插件flutter_sticky_section_list的使用

flutter_sticky_section_list 是一个用于在Flutter应用中实现粘性分区列表的插件。下面是一个完整的示例demo，展示如何使用这个插件。

示例代码

首先，我们需要创建一个基本的Flutter应用，并引入 flutter_sticky_section_list 插件。以下是完整的示例代码：

import 'package:flutter/material.dart';
import 'package:flutter_sticky_section_list/sticky_section_list.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'StickySectionList',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'StickySectionList'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(title: Text(widget.title)),
        body: Container(
          // 设置背景颜色为蓝色
          color: Colors.blue,
          child: StickySectionList(
              delegate: StickySectionListDelegate(
            // 返回分区的数量
            getSectionCount: () => 10,
            // 返回每个分区中的项目数量
            getItemCount: (sectionIndex) => 10,
            // 构建分区头部
            buildSection: (context, sectionIndex) => Container(
              // 设置分区头部背景颜色为红色
              color: Colors.red,
              child: Text("section:$sectionIndex"),
              padding: EdgeInsets.all(10), // 设置内边距
            ),
            // 构建每个分区中的项目
            buildItem: (context, sectionIndex, itemIndex) => Container(
              // 设置项目背景颜色为白色
              color: Colors.white,
              child: Text("item:$itemIndex"),
              padding: EdgeInsets.all(10), // 设置内边距
            ),
          )),
        ));
  }
}

运行效果截图

以下是运行上述代码的效果截图：

代码解释

1. 导入必要的包：

   import 'package:flutter/material.dart';
   import 'package:flutter_sticky_section_list/sticky_section_list.dart';
   

   这里我们导入了Flutter的基本组件和 flutter_sticky_section_list 插件。

2. 创建主应用类：

   class MyApp extends StatelessWidget {
     @override
     Widget build(BuildContext context) {
       return MaterialApp(
         title: 'StickySectionList',
         theme: ThemeData(
           primarySwatch: Colors.blue,
           visualDensity: VisualDensity.adaptivePlatformDensity,
         ),
         home: MyHomePage(title: 'StickySectionList'),
       );
     }
   }
   

   这个类是应用的根部件，设置了主题和主页。

3. 创建主页面类：

   class MyHomePage extends StatefulWidget {
     MyHomePage({Key? key, required this.title}) : super(key: key);
     final String title;
   
     @override
     _MyHomePageState createState() => _MyHomePageState();
   }
   

   这个类定义了主页面，并管理其状态。

4. 构建粘性分区列表：

   class _MyHomePageState extends State<MyHomePage> {
     @override
     Widget build(BuildContext context) {
       return Scaffold(
           appBar: AppBar(title: Text(widget.title)),
           body: Container(
             color: Colors.blue,
             child: StickySectionList(
                 delegate: StickySectionListDelegate(
               getSectionCount: () => 10,
               getItemCount: (sectionIndex) => 10,
               buildSection: (context, sectionIndex) => Container(
                 color: Colors.red,
                 child: Text("section:$sectionIndex"),
                 padding: EdgeInsets.all(10),
               ),
               buildItem: (context, sectionIndex, itemIndex) => Container(
                 color: Colors.white,
                 child: Text("item:$itemIndex"),
                 padding: EdgeInsets.all(10),
               ),
             )),
           ));
     }
   }