Slider (daily Flutter widget)

Slider

the Slider const ({ 
  Key Key, 
  @required this.value, // current value 
  @required this.onChanged, // change the callback 
  this.onChangeStart, 
  this.onChangeEnd, 
  this.min = 0.0, 
  this.max = 1.0, 
  this.divisions // how many scale 
  this.label, copy // displayed on the slider 
  this.activeColor, // active area color 
  this.inactiveColor, // inactive area color 
  this.semanticFormatterCallback, // for creating value based on the slide callback semantic value Example: semanticFormatterCallback:. (double newValue) {return '$ {newValue.round ()} dollars}';},

　　

 

class SliderWidget extends StatefulWidget {
  SliderWidget({Key key}) : super(key: key);

  _SliderWidgetState createState() => _SliderWidgetState();
}

class _SliderWidgetState extends State<SliderWidget> {
  double _sliderValue = 0;

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Slider(
          value: _sliderValue,
          onChanged: (double value) {
            setState(() {
              this._sliderValue = value;
            });
          },
          min: 0,
          max: 100,
          divisions: 100,
          label: '进度：$_sliderValue',
          activeColor: Colors.red,
          inactiveColor: Colors.purple,
          semanticFormatterCallback: (double value) {
            return '进度：$_sliderValue';
          }),
    );
  }
}