Flutter Widget之Slider

Widget：https://flutter.io/docs/development/ui/widgets
Slider：https://docs.flutter.io/flutter/material/Slider-class.html      

import 'package:flutter/material.dart';

class SliderDemoPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return new _SliderDemoPageState();
  }
}

class _SliderDemoPageState extends State<SliderDemoPage> {
  double progressValue = 0.0;

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: AppBar(
        title: Text('Slider Demo'),
      ),
      body: new Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: <Widget>[
          new Container(
            child: new Slider(
              value: progressValue,
              //实际进度的位置
              inactiveColor: Colors.black12,
              //进度中不活动部分的颜色
              label: '$progressValue',
              min: 0.0,
              max: 100.0,
              divisions: 1000,
              activeColor: Colors.blue,
              //进度中活动部分的颜色
              onChangeStart: (double) {
                print('onChangeStart: $double');
              },
              onChangeEnd: (double) {
                print('onChangeEnd: $double');
              },
              onChanged: (double) {
                setState(() {
                  progressValue = double.roundToDouble();
                });
              },
            ),
            width: 300.0,
          ),
          new SliderTheme(
            data: SliderTheme.of(context).copyWith(
              // activeTickMarkColor:Colors.yellowAccent,
              activeTrackColor: Colors.yellowAccent,
              //实际进度的颜色
              // inactiveTickMarkColor:Colors.black
              thumbColor: Colors.black,
              //滑块中心的颜色
              inactiveTrackColor: Colors.red,
              //默认进度条的颜色
              valueIndicatorColor: Colors.blue,
              //提示进度的气派的背景色
              valueIndicatorTextStyle: new TextStyle(
                //提示气泡里面文字的样式
                color: Colors.white,
              ),
              inactiveTickMarkColor: Colors.blue,
              //divisions对进度线分割后 断续线中间间隔的颜色
              overlayColor: Colors.pink, //滑块边缘颜色
            ),
            child: new Container(
              width: 360.0,
              alignment: Alignment.center,
              margin: EdgeInsets.fromLTRB(10.0, 50.0, 0.0, 0.0),
              child: new Row(
                children: <Widget>[
                  new Text('0.0'),
                  new Expanded(
                    flex: 1,
                    child: new Slider(
                      value: progressValue,
                      label: '$progressValue',
                      divisions: 10,
                      onChanged: (double) {
                        setState(() {
                          progressValue = double.floorToDouble(); //转化成double
                        });
                      },
                      min: 0.0,
                      max: 100.0,
                    ),
                  ),
                  new Text('100.0'),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}