add file

lib/widgets/components/Scroll/ScrollPhysics/demo.dart

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+/*
+ * @Author: 一凨 
+ * @Date: 2018-12-15 20:39:14 
+ * @Last Modified by: 一凨
+ * @Last Modified time: 2018-12-15 21:27:39
+ */
+import 'package:flutter/material.dart';
+
+class ScrollPhysicsDemo extends StatefulWidget {
+  _ScrollPhysicsDemoState createState() => _ScrollPhysicsDemoState();
+}
+
+class _ScrollPhysicsDemoState extends State<ScrollPhysicsDemo> {
+  final PageController _pageController = new PageController();
+  double _currentPage = 0.0;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      height: 300.0,
+      width: MediaQuery.of(context).size.width,
+      child: LayoutBuilder(
+        builder: (context, constraints) => NotificationListener(
+              onNotification: (ScrollNotification note) {
+                setState(() {
+                  _currentPage = _pageController.page;
+                });
+              },
+              child: PageView.custom(
+                physics: const PageScrollPhysics(
+                    parent: const BouncingScrollPhysics()),
+                controller: _pageController,
+                childrenDelegate: SliverChildBuilderDelegate(
+                  (context, index) => _SimplePage(
+                        '$index',
+                        parallaxOffset:
+                            constraints.maxWidth / 2.0 * (index - _currentPage),
+                        // 小字 Text 在页面滑动时要比整体移动速度快一倍，所以小字的 translate X 为 \tt{pageWidth / 2 * progress} 。
+                      ),
+                  childCount: 10,
+                ),
+              ),
+            ),
+      ),
+    );
+  }
+}
+
+class _SimplePage extends StatelessWidget {
+  _SimplePage(this.data, {Key key, this.parallaxOffset = 0.0})
+      : super(key: key);
+
+  final String data;
+  final double parallaxOffset;
+
+  @override
+  Widget build(BuildContext context) => new Center(
+        child: Container(
+          color: Theme.of(context).primaryColor,
+          child: new Center(
+            child: new Column(
+              mainAxisSize: MainAxisSize.min,
+              children: <Widget>[
+                new Text(
+                  data,
+                  style: const TextStyle(fontSize: 60.0,color: Colors.white),
+                ),
+                new SizedBox(height: 40.0),
+                new Transform(
+                  transform:
+                      new Matrix4.translationValues(parallaxOffset, 0.0, 0.0),
+                  child: const Text('左右滑动，这是第二行滚动速度更快的小字',style: const TextStyle(fontSize: 16.0,color: Colors.white),),
+                ),
+              ],
+            ),
+          ),
+        ),
+      );
+}

lib/widgets/components/Scroll/ScrollPhysics/index.dart

@@ -0,0 +1,44 @@
+/*
+ * @Author: 一凨 
+ * @Date: 2018-12-15 20:39:18 
+ * @Last Modified by: 一凨
+ * @Last Modified time: 2018-12-15 21:26:11
+ */
+import 'package:flutter/material.dart';
+import 'package:flutter/material.dart';
+import '../../../../common/widget_demo.dart';
+import './demo.dart';
+
+const  String content0 = '''
+### **简介**
+> 确定滚动组件的物理属性
+- 例如，确定当用户达到最大滚动范围或者停止滚动时，Scrollable的一些滚动行为
+- 当启动物理 [Simulation](https://docs.flutter.io/flutter/physics/Simulation-class.html) 时，当前滚动位置和速度将作为初始条件。
+- 使用simulation中的模拟移动来确定widget的滚动位置
+''';
+const  String content1 = '''
+### **基本用法**
+> 该widget不能赋值给参数类型为Widget的组件
+- 下方Demo，我们设置PageView的physics属性，滑动感受下下方小字自定义的滚动
+''';
+
+class Demo extends StatefulWidget {
+  static const String routeName = '/components/Scroll/ScrollPhysics';
+  _DemoState createState() => _DemoState();
+}
+
+class _DemoState extends State<Demo> {
+  @override
+  Widget build(BuildContext context) {
+    return WidgetDemo(
+      contentList: [
+        content0,
+        content1,
+        ScrollPhysicsDemo(),
+      ],
+      codeUrl: 'components/Scroll/ScrollPhysics/demo.dart',
+      docUrl: 'https://docs.flutter.io/flutter/widgets/ScrollPhysics-class.html',
+      title: 'ScrollPhysics',
+    );
+  }
+}