Flutter颜色渐变生成插件color_shade的使用

概述

color_shade 是一个扩展 Color 类的包，用于从主色调生成各种色调。

使用

要使用该插件，只需导入包即可。色调可以从50到900不等，这与 Material Design 中的颜色类似。

导入插件

import 'package:color_shade/color_shade.dart';

访问色调

以下是如何访问不同色调的例子：

const primaryColor = Color(0xFFFFEB3B); // 黄色

// 获取不同色调
primaryColor.shade50; 
primaryColor.shade100;
primaryColor.shade200;
primaryColor.shade300;
primaryColor.shade400;
primaryColor.shade500;
primaryColor.shade600;
primaryColor.shade700;
primaryColor.shade800;
primaryColor.shade900;

将色调应用于主题

可以将颜色的色调传递给 ThemeData 的 primarySwatch 属性。

MaterialApp(
  title: 'ColorShade Demo',
  theme: ThemeData(
    primarySwatch: const Color(0xFFFFEB3B).swatch,
  ),
  home: HomePage(),
)

完整示例

下面是一个完整的示例代码，展示了如何在 Flutter 应用程序中使用 color_shade 插件来切换主题并展示不同色调的应用。

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

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

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

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool _isDarkTheme = false;

  void _toggleTheme() {
    setState(() {
      _isDarkTheme = !_isDarkTheme;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'ColorShade Demo',
      theme: ThemeData(
        brightness: Brightness.light,
        useMaterial3: true,
        primarySwatch: const Color(0xFFFFEB3B).swatch,
      ),
      darkTheme: ThemeData(
        brightness: Brightness.dark,
        useMaterial3: true,
        primarySwatch: const Color(0xFFFFEB3B).swatch,
      ),
      themeMode: _isDarkTheme ? ThemeMode.dark : ThemeMode.light,
      home: MyHomePage(
        title: 'ColorShade Demo',
        toggleTheme: _toggleTheme,
      ),
    );
  }
}

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

  final String title;
  final VoidCallback toggleTheme;

  [@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) {
    return Scaffold(
      backgroundColor: Theme.of(context).colorScheme.background,
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              '你已经点击按钮次数：',
              style: TextStyle(color: Theme.of(context).colorScheme.primary),
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium?.copyWith(
                  color: Theme.of(context).colorScheme.primary.shade900),
            ),
          ],
        ),
      ),
      floatingActionButton: Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: [
          FloatingActionButton(
            onPressed: widget.toggleTheme,
            tooltip: '切换深色/浅色模式',
            child: const Icon(Icons.dark_mode),
          ),
          const SizedBox(width: 8),
          FloatingActionButton(
            onPressed: _incrementCounter,
            tooltip: '增加',
            child: const Icon(Icons.add),
          )
        ],
      ),
    );
  }
}