import 'package:flutter/material.dart';

/// create by 张风捷特烈 on 2020-03-31
/// contact me by email 1981462002@qq.com
/// 说明: 
//    {
//      "widgetId": 194,
//      "name": 'Scrollbar基本使用',
//      "priority": 1,
//      "subtitle":
//          "【child】 : 子组件   【Widget】\n"
//          "【controller】 : 控制器  【ScrollController】",
//    }
class CustomScrollbar extends StatelessWidget {
  CustomScrollbar({Key? key}) : super(key: key);

  final List<Color> data = [
    Colors.purple[50]!,
    Colors.purple[100]!,
    Colors.purple[200]!,
    Colors.purple[300]!,
    Colors.purple[400]!,
    Colors.purple[500]!,
    Colors.purple[600]!,
    Colors.purple[700]!,
    Colors.purple[800]!,
    Colors.purple[900]!,
  ];

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      height: 200,
      child: Scrollbar(
        child: ListView(
          padding: const EdgeInsets.symmetric(horizontal: 5),
          children: data
              .map((color) => Container(
                    alignment: Alignment.center,
                    width: 100,
                    height: 50,
                    color: color,
                    child: Text(
                      colorString(color),
                      style: const TextStyle(
                        color: Colors.white,
                        shadows: [
                          Shadow(
                              color: Colors.black,
                              offset: Offset(.5, .5),
                              blurRadius: 2)
                        ],
                      ),
                    ),
              ))
              .toList(),
        ),
      ),
    );
  }

  String colorString(Color color) =>
      "#${color.value.toRadixString(16).padLeft(8, '0').toUpperCase()}";
}