Flutter圆形滑块插件flutter_circular_slider的使用

flutter_circular_slider

一个高度可定制的圆形滑块插件，适用于Flutter。

开始使用

安装

在pubspec.yaml文件中添加以下依赖：

flutter_circular_slider: ^latest_version

然后运行以下命令以安装依赖：

flutter packages get

基本用法

创建一个新的Flutter项目：

flutter create myapp

编辑lib/main.dart文件如下：

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.blueGrey,
      body: Center(
        child: Container(
          child: DoubleCircularSlider(
            100,  // 分割数
            0,    // 初始值
            20,   // 结束值
          ),
        ),
      ),
    );
  }
}

此代码中提供了两种不同的选项：

• SingleCircularSlider: 单个滑块，可以通过拖动或点击来移动。
• DoubleCircularSlider: 双滑块，需要通过拖动来调整两个滑块的位置。

构造函数参数

以下是DoubleCircularSlider和SingleCircularSlider的构造函数参数说明：

使用场景

完整选择移动

单滑块

圈数

睡眠时间选择

import 'dart:math';

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
        body: SafeArea(
      child: Container(
          decoration: BoxDecoration(
            image: DecorationImage(
              image: AssetImage('images/background_morning.png'),
              fit: BoxFit.cover,
            ),
          ),
          child: SleepPage()),
    ));
  }
}

class SleepPage extends StatefulWidget {
  [@override](/user/override)
  _SleepPageState createState() => _SleepPageState();
}

class _SleepPageState extends State<SleepPage> {
  final baseColor = Color.fromRGBO(255, 255, 255, 0.3);

  int initTime;
  int endTime;

  int inBedTime;
  int outBedTime;

  [@override](/user/override)
  void initState() {
    super.initState();
    _shuffle();
  }

  void _shuffle() {
    setState(() {
      initTime = _generateRandomTime();
      endTime = _generateRandomTime();
      inBedTime = initTime;
      outBedTime = endTime;
    });
  }

  void _updateLabels(int init, int end) {
    setState(() {
      inBedTime = init;
      outBedTime = end;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        Text(
          'How long did you stay in bed?',
          style: TextStyle(color: Colors.white),
        ),
        DoubleCircularSlider(
          288,
          initTime,
          endTime,
          height: 260.0,
          width: 260.0,
          primarySectors: 6,
          secondarySectors: 24,
          baseColor: Color.fromRGBO(255, 255, 255, 0.1),
          selectionColor: baseColor,
          handlerColor: Colors.white,
          handlerOutterRadius: 12.0,
          onSelectionChange: _updateLabels,
          sliderStrokeWidth: 12.0,
          child: Padding(
            padding: const EdgeInsets.all(42.0),
            child: Center(
                child: Text('${_formatIntervalTime(inBedTime, outBedTime)}',
                    style: TextStyle(fontSize: 36.0, color: Colors.white))),
          ),
        ),
        Row(mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [
          _formatBedTime('IN THE', inBedTime),
          _formatBedTime('OUT OF', outBedTime),
        ]),
        FlatButton(
          child: Text('S H U F F L E'),
          color: baseColor,
          textColor: Colors.white,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(50.0),
          ),
          onPressed: _shuffle,
        ),
      ],
    );
  }

  Widget _formatBedTime(String pre, int time) {
    return Column(
      children: [
        Text(pre, style: TextStyle(color: baseColor)),
        Text('BED AT', style: TextStyle(color: baseColor)),
        Text(
          '${_formatTime(time)}',
          style: TextStyle(color: Colors.white),
        )
      ],
    );
  }

  String _formatTime(int time) {
    if (time == 0 || time == null) {
      return '00:00';
    }
    var hours = time ~/ 12;
    var minutes = (time % 12) * 5;
    return '$hours:$minutes';
  }

  String _formatIntervalTime(int init, int end) {
    var sleepTime = end > init ? end - init : 288 - init + end;
    var hours = sleepTime ~/ 12;
    var minutes = (sleepTime % 12) * 5;
    return '${hours}h${minutes}m';
  }

  int _generateRandomTime() => Random().nextInt(288);
}