Flutter屏幕适配插件responsivebility的使用

简介

responsivebility 是一个用于在 Flutter 中创建响应式布局的简单工具库。通过使用该库，可以轻松地根据屏幕尺寸变化平滑过渡不同的值，并编写简单的逻辑来获取条件依赖于断点的属性。

功能

• 在屏幕视口大小发生变化时，平滑过渡不同范围内的值。
• 编写简单的逻辑以获取基于断点条件的属性。

开始使用

要开始使用 responsivebility，首先需要将它添加到你的 pubspec.yaml 文件中：

dependencies:
  responsivebility: ^版本号

然后运行 flutter pub get 来安装该库。

示例代码

以下是一个完整的示例，展示了如何使用 responsivebility 库来创建一个响应式布局的应用程序。

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

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  [@override](/user/override)
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    final responsive = Responsivebility.of(
      context,
      range: ResponsiveRange({
        360: 24,
        500: 48,
        800: 65,
      }),
      breakpointSize: (size, visualDensity) {
        return size.width;
      },
    );

    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        toolbarHeight: responsive.size(
          range: ResponsiveRange({
            360: kToolbarHeight,
            800: 100,
          }),
        ),
        leading: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            FlutterLogo(
              // 这将返回一个介于 24 和 48 之间的值。
              // 它会根据屏幕的最短宽度（默认情况下）进行线性插值。
              size: responsive.size(
                range: ResponsiveRange({
                  360: 24,
                  500: 48,
                }),
              ),
              // 根据条件更改属性
              style: responsive.valueOf<FlutterLogoStyle>(
                when: (size) {
                  if (size > 80) return FlutterLogoStyle.horizontal;
                  if (size > kToolbarHeight) return FlutterLogoStyle.stacked;
                  return FlutterLogoStyle.markOnly;
                },
              ),
            ),
          ],
        ),
        actions: [
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: ActionButton(responsive: responsive),
          ),
        ],
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text(
              '你已经按下了按钮多少次:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: '增加',
        child: const Icon(Icons.add),
      ),
    );
  }
}

class ActionButton extends StatelessWidget {
  const ActionButton({
    super.key,
    required this.responsive,
  });

  final Responsivebility responsive;

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Container(
          // 这将返回一个介于 24 和 48 之间的值。
          // 它会根据屏幕的最短宽度（默认情况下）进行线性插值。
          height: responsive.size(
            range: ResponsiveRange({
              360: 24,
              500: 48,
            }),
          ),
          width: responsive.size(
            range: ResponsiveRange({
              360: 24,
              500: 48,
            }),
          ),
          // 根据条件更改属性
          color: responsive.valueOf<Color>(
            when: (size) {
              if (size > 80) return Colors.red;
              if (size > kToolbarHeight) return Colors.orange;
              return Colors.blue;
            },
          ),
        ),
      ],
    );
  }
}