import 'package:flutter/material.dart';

/// create by 张风捷特烈 on 2020-03-30
/// contact me by email 1981462002@qq.com
/// 说明:
//    {
//      "widgetId": 180,
//      "name": 'ScrollConfiguration基本使用',
//      "priority": 1,
//      "subtitle":
//          "【child】 : 子组件   【Widget】\n"
//          "【behavior】 : 滑动行为  【ScrollBehavior】\n"
//          "    可以使用ScrollConfiguration让ListView无蓝色阴影",
//    }
class CustomScrollConfiguration extends StatelessWidget {
  final data = <Color>[
    Colors.cyan[50],
    Colors.cyan[100],
    Colors.cyan[200],
    Colors.cyan[300],
    Colors.cyan[400],
    Colors.cyan[500],
    Colors.cyan[600],
    Colors.cyan[700],
    Colors.cyan[800],
    Colors.cyan[900],
  ];

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 200,
      child: ScrollConfiguration(
          behavior: NoScrollBehavior(), child: _buildListView()),
    );
  }

  Widget _buildListView() => ListView(
        padding: EdgeInsets.symmetric(horizontal: 5),
        children: data
            .map((color) => Container(
                  alignment: Alignment.center,
                  width: 100,
                  height: 50,
                  color: color,
                  child: Text(
                    colorString(color),
                    style: 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()}";
}

class NoScrollBehavior extends ScrollBehavior {
  @override
  Widget buildViewportChrome(
          BuildContext context, Widget child, AxisDirection axisDirection) =>
      child;
}