forked from lxm_flutter/FlutterUnit
87 lines
2.3 KiB
Dart
87 lines
2.3 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020-03-30
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/// contact me by email 1981462002@qq.com
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/// 说明:
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// {
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// "widgetId": 179,
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// "name": 'ListWheelScrollView基本使用',
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// "priority": 1,
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// "subtitle":
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// "【children】 : 子组件列表 【List<Widget>】\n"
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// "【perspective】 : 透视度 【double】\n"
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// "【itemExtent】 : item高 【EdgeInsets】\n"
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// "【onSelectedItemChanged】 : 选中回调 【ValueChanged<int> 】",
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// }
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class CustomListWheelScrollView extends StatefulWidget {
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@override
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_CustomListWheelScrollViewState createState() => _CustomListWheelScrollViewState();
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}
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class _CustomListWheelScrollViewState extends State<CustomListWheelScrollView> {
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var data = <Color>[
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Colors.orange[50],
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Colors.orange[100],
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Colors.orange[200],
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Colors.orange[300],
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Colors.orange[400],
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Colors.orange[500],
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Colors.orange[600],
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Colors.orange[700],
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Colors.orange[800],
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Colors.orange[900],
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];
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Color _color = Colors.blue;
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@override
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Widget build(BuildContext context) {
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return Column(
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children: <Widget>[
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_buildCircle(),
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Container(
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height: 150,
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width: 300,
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child: ListWheelScrollView(
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perspective: 0.006,
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itemExtent: 50,
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onSelectedItemChanged: (index){
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print('onSelectedItemChanged:$index');
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setState(() => _color=data[index]);
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},
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children: data.map((color) => _buildItem(color)).toList(),
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),
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),
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],
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);
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}
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Widget _buildCircle() => Container(
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margin: EdgeInsets.only(bottom: 5),
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width: 30,
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height: 30,
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decoration: BoxDecoration(
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color: _color,
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shape: BoxShape.circle
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),
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);
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Widget _buildItem(Color color) {
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return Container(
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key: ValueKey(color) ,
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alignment: Alignment.center,
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height: 50,
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color: color,
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child: Text(
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colorString(color),
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style: TextStyle(color: Colors.white, shadows: [
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Shadow(color: Colors.black, offset: Offset(.5, .5), blurRadius: 2)
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]),
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),
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);
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}
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String colorString(Color color) =>
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"#${color.value.toRadixString(16).padLeft(8, '0').toUpperCase()}";
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}
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