forked from lxm_flutter/FlutterUnit
56 lines
1.7 KiB
Dart
56 lines
1.7 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.builder构造',
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// "priority": 4,
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// "subtitle":
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// "【itemCount】 : 条目数量 【int】\n"
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// "【gridDelegate】 : 网格代理 【SliverGridDelegate】\n"
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// "【itemBuilder】 : 条目构造器 【IndexedWidgetBuilder】",
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// }
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class BuilderGridView extends StatelessWidget {
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BuilderGridView({Key? key}) : super(key: key);
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final List<Color> data = List.generate(128, (i) => Color(0xFF33FFF - 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.builder(
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itemCount: data.length,
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scrollDirection: Axis.vertical,
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gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
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//网格代理：定交叉轴数目
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crossAxisCount: 4, //条目个数
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mainAxisSpacing: 5, //主轴间距
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crossAxisSpacing: 5, //交叉轴间距
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childAspectRatio: 1 / 0.618),
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itemBuilder: (_, int position) => _buildItem(data[position])),
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);
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}
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Widget _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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} |