✨ 添加SliverPrototypeExtentList组件

lib/views/widgets/MultiChildRenderObjectWidget/Stack/node1_base.dart

@@ -48,7 +48,7 @@ class CustomStack extends StatelessWidget {
         textDirection: TextDirection.rtl,
         fit: StackFit.loose,
         alignment: Alignment.topRight,
-        overflow: Overflow.clip,
+        // overflow: Overflow.clip, // 1.22.0-10.0.pre.251被去除
         children: <Widget>[yellowBox, redBox, greenBox, cyanBox],
       ),
     );

lib/views/widgets/Sliver/SliverPrototypeExtentList/SliverPrototypeExtentList.dart

@@ -0,0 +1,105 @@
+import 'package:flutter/material.dart';
+
+/// create by 张风捷特烈 on 2020/9/21
+/// contact me by email 1981462002@qq.com
+/// 说明: 314 SliverPrototypeExtentList Sliver原型延伸列表 prototypeItem属性是一个Widget,该Widget负责在主轴方向上约束item尺寸，但会不显示出来。delegate接受一个SliverChildDelegate完成item的创建。
+//    {
+//      "widgetId": 314,
+//      "name": 'SliverPrototypeExtentList基本使用',
+//      "priority": 1,
+//      "subtitle":
+//          "【prototypeItem】 : 主轴方向尺寸组件   【Widget】\n"
+//          "【delegate】 : 孩子代理   【SliverChildDelegate】",
+//    }
+class SliverPrototypeExtentListDemo extends StatefulWidget {
+  @override
+  _SliverPrototypeExtentListDemoState createState() =>
+      _SliverPrototypeExtentListDemoState();
+}
+
+class _SliverPrototypeExtentListDemoState
+    extends State<SliverPrototypeExtentListDemo> {
+  final data = <Color>[
+    Colors.orange[50],
+    Colors.orange[100],
+    Colors.orange[200],
+    Colors.orange[300],
+    Colors.orange[400],
+    Colors.orange[500],
+    Colors.orange[600],
+    Colors.orange[700],
+    Colors.orange[800],
+    Colors.orange[900],
+  ];
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      height: 300,
+      child: CustomScrollView(
+        slivers: <Widget>[_buildSliverAppBar(), _buildSliverList()],
+      ),
+    );
+  }
+
+  Widget _buildSliverList() => SliverPrototypeExtentList(
+        prototypeItem: Container(
+          height: 80,
+        ),
+        delegate: SliverChildBuilderDelegate(
+            (_, int index) => Container(
+                  alignment: Alignment.center,
+                  width: 100,
+                  height: 60,
+                  color: data[index],
+                  child: Text(
+                    colorString(data[index]),
+                    style: TextStyle(color: Colors.white, shadows: [
+                      Shadow(
+                          color: Colors.black,
+                          offset: Offset(.5, .5),
+                          blurRadius: 2)
+                    ]),
+                  ),
+                ),
+            childCount: data.length),
+      );
+
+  Widget _buildSliverAppBar() {
+    return SliverAppBar(
+      expandedHeight: 150.0,
+      leading: _buildLeading(),
+      title: Text('张风捷特烈'),
+      actions: _buildActions(),
+      elevation: 5,
+      pinned: true,
+      backgroundColor: Colors.orange,
+      flexibleSpace: FlexibleSpaceBar(
+        //伸展处布局
+        titlePadding: EdgeInsets.only(left: 55, bottom: 15), //标题边距
+        collapseMode: CollapseMode.parallax, //视差效果
+        background: Image.asset(
+          "assets/images/caver.webp",
+          fit: BoxFit.cover,
+        ),
+      ),
+    );
+  }
+
+  Widget _buildLeading() => Container(
+      margin: EdgeInsets.all(10),
+      child: Image.asset('assets/images/icon_head.webp'));
+
+  List<Widget> _buildActions() => <Widget>[
+        IconButton(
+          onPressed: () {},
+          icon: Icon(
+            Icons.star_border,
+            color: Colors.white,
+          ),
+        )
+      ];
+
+  String colorString(Color color) =>
+      "#${color.value.toRadixString(16).padLeft(8, '0').toUpperCase()}";
+}

lib/views/widgets/exp/sliver_unit.dart

@@ -17,3 +17,4 @@ export '../Sliver/SliverPersistentHeader/node1_base.dart';
 export '../Sliver/SliverToBoxAdapter/node1_base.dart';
 export '../Sliver/SliverOverlapAbsorber/node1_base.dart';
 export '../Sliver/SliverOverlapInjector/node1_base.dart';
+export '../Sliver/SliverPrototypeExtentList/node1_base.dart';

lib/views/widgets/widgets_map.dart

@@ -55,6 +55,10 @@ class WidgetsMap {
         return [
           ViewportDemo(),
         ];
+      case "SliverPrototypeExtentList":
+        return [
+          SliverPrototypeExtentListDemo(),
+        ];
       case "InputDecorator":
         return [
           InputDecoratorDemo(),