forked from lxm_flutter/FlutterUnit
54 lines
1.5 KiB
Dart
54 lines
1.5 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020-03-27
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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": 163,
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// "name": 'GridView.extent构造',
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// "priority": 3,
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// "subtitle":
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// "【maxCrossAxisExtent】 : box轴向长度 【double】\n"
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// "【reverse】 : 是否反向滑动 【bool】\n"
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// "【shrinkWrap】 : 无边界时是否包裹 【bool】",
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// }
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class ExtentGridView extends StatelessWidget {
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ExtentGridView({Key? key}) : super(key: key);
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final List<Color> data = List.generate(128, (i) => Color(0xFF00FFFF - 2 * i));
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@override
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Widget build(BuildContext context) {
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return SizedBox(
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height: 200,
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child: GridView.extent(
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scrollDirection: Axis.horizontal,
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maxCrossAxisExtent: 80.0,
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mainAxisSpacing: 2,
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crossAxisSpacing: 2,
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childAspectRatio: 0.618,
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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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Container _buildItem(Color color) => Container(
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alignment: Alignment.center,
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width: 100,
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height: 30,
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color: color,
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child: Text(
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colorString(color),
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style: const TextStyle(
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color: Colors.white,
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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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} |