Flutter滚动按钮栏插件scrolling_buttons_bar的使用

Flutter滚动按钮栏插件scrolling_buttons_bar的使用

ScrollingButtonsBar 是一个 Flutter 库，允许你创建带有滚动和选择动画效果的按钮栏。

演示视频

完整示例代码

import 'package:flutter/material.dart';
import 'package:scrolling_buttons_bar/scrolling_buttons_bar.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // 这个小部件是你的应用的根
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter 动画按钮栏'),
    );
  }
}

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

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int selectedItemIndex = -1;

  final ScrollController _scrollController = ScrollController();

  @override
  Widget build(BuildContext context) {
    // 计算每个按钮的高度和宽度
    double childHeight = MediaQuery.of(context).size.height / 20;
    double childWidth = MediaQuery.of(context).size.width / 5;
    double iconSize = childHeight * 0.8;
    
    // 定义按钮图标数组
    var toolbarItems = [
      Icon(Icons.home, size: iconSize, color: Colors.red,),
      Icon(Icons.search, size: iconSize, color: Colors.blue,),
      Icon(Icons.notifications, size: iconSize, color: Colors.orange,),
      Icon(Icons.description, size: iconSize, color: Colors.indigoAccent,),
      Icon(Icons.image, size: iconSize, color: Colors.green,),
      Icon(Icons.opacity, size: iconSize, color: Colors.black),
      Icon(Icons.expand, size: iconSize, color: Colors.pinkAccent),
    ];

    return Scaffold(
      extendBody: true,
      extendBodyBehindAppBar: true,
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: SafeArea(child: Container()),
      bottomNavigationBar: SafeArea(
        child: ScrollingButtonBar(
          selectedItemIndex: selectedItemIndex,
          scrollController: _scrollController,
          childWidth: childWidth,
          childHeight: childHeight,
          foregroundColor: const Color(0xffc7c7c7),
          radius: 6,
          animationDuration: const Duration(milliseconds: 333),
          children: [for (int i = 0; i < toolbarItems.length; i++) buildSingleItemInToolbar(i, toolbarItems)],
        ),
      ),
    );
  }

  // 构建单个按钮项
  buildSingleItemInToolbar(i, toolbarItems) {
    return ButtonsItem(
        child: toolbarItems[i],
        onTap: () {
          setState(() {
            selectedItemIndex = i;
          });
        });
  }
}

代码说明

1. 导入必要的库：

   import 'package:flutter/material.dart';
   import 'package:scrolling_buttons_bar/scrolling_buttons_bar.dart';
   

2. 定义主应用类 MyApp：

   class MyApp extends StatelessWidget {
     const MyApp({Key? key}) : super(key: key);
     
     @override
     Widget build(BuildContext context) {
       return MaterialApp(
         title: 'Flutter Demo',
         theme: ThemeData(
           primarySwatch: Colors.blue,
         ),
         home: const MyHomePage(title: 'Flutter 动画按钮栏'),
       );
     }
   }
   

3. 定义主页类 MyHomePage 和状态类 _MyHomePageState：

   class MyHomePage extends StatefulWidget {
     const MyHomePage({Key? key, required this.title}) : super(key: key);
     
     final String title;
     
     @override
     State<MyHomePage> createState() => _MyHomePageState();
   }
   
   class _MyHomePageState extends State<MyHomePage> {
     int selectedItemIndex = -1;
     final ScrollController _scrollController = ScrollController();
     
     @override
     Widget build(BuildContext context) {
       double childHeight = MediaQuery.of(context).size.height / 20;
       double childWidth = MediaQuery.of(context).size.width / 5;
       double iconSize = childHeight * 0.8;
       
       var toolbarItems = [
         Icon(Icons.home, size: iconSize, color: Colors.red,),
         Icon(Icons.search, size: iconSize, color: Colors.blue,),
         Icon(Icons.notifications, size: iconSize, color: Colors.orange,),
         Icon(Icons.description, size: iconSize, color: Colors.indigoAccent,),
         Icon(Icons.image, size: iconSize, color: Colors.green,),
         Icon(Icons.opacity, size: iconSize, color: Colors.black),
         Icon(Icons.expand, size: iconSize, color: Colors.pinkAccent),
       ];
       
       return Scaffold(
         extendBody: true,
         extendBodyBehindAppBar: true,
         appBar: AppBar(
           title: Text(widget.title),
         ),
         body: SafeArea(child: Container()),
         bottomNavigationBar: SafeArea(
           child: ScrollingButtonBar(
             selectedItemIndex: selectedItemIndex,
             scrollController: _scrollController,
             childWidth: childWidth,
             childHeight: childHeight,
             foregroundColor: const Color(0xffc7c7c7),
             radius: 6,
             animationDuration: const Duration(milliseconds: 333),
             children: [for (int i = 0; i < toolbarItems.length; i++) buildSingleItemInToolbar(i, toolbarItems)],
           ),
         ),
       );
     }
   
     buildSingleItemInToolbar(i, toolbarItems) {
       return ButtonsItem(
           child: toolbarItems[i],
           onTap: () {
             setState(() {
               selectedItemIndex = i;
             });
           });
     }
   }