🎨 优化展示组件代码的存在形式,stateless重构完毕

lib/views/widgets/StatelessWidget/GirdView/node3_extend.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+
+/// create by 张风捷特烈 on 2020-03-27
+/// contact me by email 1981462002@qq.com
+/// 说明:
+
+//    {
+//      "widgetId": 163,
+//      "name": 'GridView.extent构造',
+//      "priority": 3,
+//      "subtitle":
+//          "【maxCrossAxisExtent】 : box轴向长度   【double】\n"
+//          "【reverse】 : 是否反向滑动   【bool】\n"
+//          "【shrinkWrap】 : 无边界时是否包裹  【bool】",
+//    }
+class ExtentGridView extends StatelessWidget {
+  final data = List.generate(128, (i) => Color(0xFF00FFFF - 2*i));
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      height: 200,
+      child: GridView.extent(
+        scrollDirection: Axis.horizontal,
+        maxCrossAxisExtent: 80.0,
+        mainAxisSpacing: 2,
+        crossAxisSpacing: 2,
+        childAspectRatio: 0.618,
+        children: data
+            .map((color) => _buildItem(color))
+            .toList(),
+      ),
+    );
+  }
+
+  Container _buildItem(Color color) => Container(
+    alignment: Alignment.center,
+    width: 100,
+    height: 30,
+    color: color,
+    child: Text(
+      colorString(color),
+      style: TextStyle(color: Colors.white, shadows: [
+        Shadow(
+            color: Colors.black,
+            offset: Offset(.5, .5),
+            blurRadius: 2)
+      ]),
+    ),
+  );
+
+  String colorString(Color color) =>
+      "#${color.value.toRadixString(16).padLeft(8, '0').toUpperCase()}";
+}