✨ 添加组件 AnnotatedRegion、CheckedModeBanner、CupertinoTabView、CupertinoTextSelectionToolbar、DefaultTabController、DraggableScrollableActuator、DraggableScrollableSheet、DrawerController、GlowingOverscrollIndicator、 MergeableMaterial、SizeChangedLayoutNotifier、SliverLayoutBuilder、TableCell

2020-11-14 10:30:26 +08:00
parent a0ee4b9759
commit 8ecd3042b9
20 changed files with 1091 additions and 0 deletions
--- a/lib/views/widgets/Sliver/SliverLayoutBuilder/node1_base.dart
+++ b/lib/views/widgets/Sliver/SliverLayoutBuilder/node1_base.dart
@@ -0,0 +1,123 @@
+import 'dart:math';
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/src/rendering/sliver.dart';
+
+/// create by 张风捷特烈 on 2020/9/21
+/// contact me by email 1981462002@qq.com
+/// 说明: 304 SliverLayoutBuilder Sliver布局构造器 Sliver家族一员，在滑动过程中可以通过回调出的 SliverConstraints 对象进行子组件的构造。
+//    {
+//      "widgetId": 304,
+//      "name": 'SliverLayoutBuilder基本使用',
+//      "priority": 1,
+//      "subtitle":
+//          "【builder】 : 组件构造器   【SliverLayoutWidgetBuilder】",
+//    }
+class SliverLayoutBuilderDemo extends StatefulWidget {
+  @override
+  _SliverLayoutBuilderDemoState createState() =>
+      _SliverLayoutBuilderDemoState();
+}
+
+class _SliverLayoutBuilderDemoState extends State<SliverLayoutBuilderDemo> {
+  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(
+        physics: BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics()),
+        slivers: <Widget>[
+          _buildSliverAppBar(),
+          SliverLayoutBuilder(
+            builder: _buildSliver,
+          ),
+          _buildSliverList(),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildSliverList() => SliverFixedExtentList(
+        itemExtent: 50,
+        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: 120.0,
+      leading: Container(
+          margin: EdgeInsets.all(10),
+          child: Image.asset('assets/images/icon_head.webp')),
+      title: Text('张风捷特烈'),
+      actions: _buildActions(),
+      elevation: 5,
+      pinned: true,
+      backgroundColor: Colors.orange,
+      flexibleSpace: FlexibleSpaceBar(
+        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,
+        ),
+      ),
+    );
+  }
+
+  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()}";
+
+  Widget _buildSliver(BuildContext context, SliverConstraints constraints) {
+    return SliverToBoxAdapter(
+      child: Container(
+        alignment: Alignment.center,
+        height: constraints.remainingPaintExtent / 3,
+        color: Colors.red,
+        child: Text(
+          "SliverLayoutBuilder",
+          style: TextStyle(color: Colors.white, fontSize: 20),
+        ),
+      ),
+    );
+  }
+}