Merge branch 'develop' into dev/yisheng

* develop:
  fix:code

ios/Runner.xcodeproj/project.pbxproj

@@ -10,7 +10,6 @@
 		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
 		333E5DAE7FC10AC69FEC26C0 /* libPods-Runner.a in Frameworks */ = {isa = PBXBuildFile; fileRef = DDA792F029EDD7A11295D192 /* libPods-Runner.a */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
-		2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */ = {isa = PBXBuildFile; fileRef = 2D5378251FAA1A9400D5DBA9 /* flutter_assets */; };
 		3B80C3941E831B6300D905FE /* App.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; };
 		3B80C3951E831B6300D905FE /* App.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		9705A1C61CF904A100538489 /* Flutter.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEBA1CF902C7004384FC /* Flutter.framework */; };
@@ -41,7 +40,6 @@
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
-		2D5378251FAA1A9400D5DBA9 /* flutter_assets */ = {isa = PBXFileReference; lastKnownFileType = folder; name = flutter_assets; path = Flutter/flutter_assets; sourceTree = SOURCE_ROOT; };
 		3B80C3931E831B6300D905FE /* App.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = App.framework; path = Flutter/App.framework; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
 		7AFFD8ED1D35381100E5BB4D /* AppDelegate.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
@@ -92,7 +90,6 @@
 			children = (
 				3B80C3931E831B6300D905FE /* App.framework */,
 				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
-				2D5378251FAA1A9400D5DBA9 /* flutter_assets */,
 				9740EEBA1CF902C7004384FC /* Flutter.framework */,
 				9740EEB21CF90195004384FC /* Debug.xcconfig */,
 				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
@@ -209,7 +206,6 @@
 			files = (
 				97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */,
 				3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */,
-				2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */,
 				97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */,
 				97C146FC1CF9000F007C117D /* Main.storyboard in Resources */,
 			);

lib/widgets/404.dart

@@ -9,7 +9,7 @@ class WidgetNotFound extends StatelessWidget {
             title: Text("widget not found"),
           ),
           body: Container(
-              child: new Text("widget not found")
+              child:  Text("widget not found")
           )
       );
     }

lib/widgets/components/Bar/AppBar/demo.dart

@@ -30,8 +30,8 @@ class _AppBarLessDefaultComplex extends State with SingleTickerProviderStateMixi
   @override
   void initState() {
     super.initState();
-    _scrollViewController = new ScrollController();
-    _tabController = new TabController(vsync: this, length: 6);// 和下面的 TabBar.tabs 数量对应
+    _scrollViewController =  ScrollController();
+    _tabController =  TabController(vsync: this, length: 6);// 和下面的 TabBar.tabs 数量对应
   }
 
   @override
@@ -46,26 +46,26 @@ class _AppBarLessDefaultComplex extends State with SingleTickerProviderStateMixi
     // 如果省略了 leading ，但 AppBar 在带有 Drawer 的 Scaffold 中，则会插入一个 button 以打开 Drawer。
     // 否则，如果最近的 Navigator 具有任何先前的 router ，则会插入BackButton。
     // 这种行为可以通过设置来关闭automaticallyImplyLeading 为false。在这种情况下，空的 leading widget 将导致 middle/title widget 拉伸开始。
-    return new SizedBox(
+    return  SizedBox(
       height: 500,
-      child:new AppBar( // 大量配置属性参考 SliverAppBar 示例
-        title: new Text('title'),
-        leading: new Icon(Icons.home),
+      child: AppBar( // 大量配置属性参考 SliverAppBar 示例
+        title:  Text('title'),
+        leading:  Icon(Icons.home),
         backgroundColor: Colors.amber[500],
         centerTitle: true,
         actions: <Widget>[
-          new IconButton(
-              icon: new Icon(Icons.add_alarm),
+           IconButton(
+              icon:  Icon(Icons.add_alarm),
               tooltip: 'Add Alarm',
               onPressed: () {
                 // do nothing
               }),
-          new PopupMenuButton<String>(
+           PopupMenuButton<String>(
               itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[
-                new PopupMenuItem<String>(
-                    value: "price", child: new Text('Sort by price')),
-                new PopupMenuItem<String>(
-                    value: "time", child: new Text('Sort by time')),
+                 PopupMenuItem<String>(
+                    value: "price", child:  Text('Sort by price')),
+                 PopupMenuItem<String>(
+                    value: "time", child:  Text('Sort by time')),
               ],
               onSelected: (String action) {
                 switch (action) {
@@ -78,16 +78,16 @@ class _AppBarLessDefaultComplex extends State with SingleTickerProviderStateMixi
                 }
               })
         ],
-        bottom: new TabBar(
+        bottom:  TabBar(
           isScrollable: true,
           controller: _tabController,
           tabs: <Widget>[
-            new Tab(text: "Tabs 1"),
-            new Tab(text: "Tabs 2"),
-            new Tab(text: "Tabs 3"),
-            new Tab(text: "Tabs 4"),
-            new Tab(text: "Tabs 5"),
-            new Tab(text: "Tabs 6"),
+             Tab(text: "Tabs 1"),
+             Tab(text: "Tabs 2"),
+             Tab(text: "Tabs 3"),
+             Tab(text: "Tabs 4"),
+             Tab(text: "Tabs 5"),
+             Tab(text: "Tabs 6"),
           ],
         ),
       ),
@@ -107,7 +107,7 @@ class AppBarLessDefaultSimple extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-      return new SizedBox(
+      return  SizedBox(
           height: 200,
           child:AppBar(
             title: Text('My Fancy Dress'),

lib/widgets/components/Bar/AppBar/index.dart

@@ -62,7 +62,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDomes(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -84,7 +84,7 @@ Widget allDomes(BuildContext context, _DemoState that) {
 * 带align的text
 * */
 Widget textAlignBar(String txt) {
-  return new Align(
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[

lib/widgets/components/Bar/BottomAppBar/demo.dart

@@ -21,7 +21,7 @@ class AppBarLessDefaultSimple extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new SizedBox(
+    return  SizedBox(
       height: 100,
       child: Scaffold(
         //appBar: AppBar(title: const Text('Bottom App Bar')),

lib/widgets/components/Bar/BottomAppBar/index.dart

@@ -52,7 +52,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDomes(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[

lib/widgets/components/Bar/ButtonBar/demo.dart

@@ -44,9 +44,9 @@ class ButtonBarLessDefault extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Container(
-        margin: new EdgeInsets.symmetric(vertical: 0.0),
+        margin:  EdgeInsets.symmetric(vertical: 0.0),
         height: 100.0,
-        child: new Scrollbar(child:ListView(
+        child:  Scrollbar(child:ListView(
             scrollDirection: Axis.horizontal, // 水平listView
             children: <Widget>[
               ButtonBar(

lib/widgets/components/Bar/ButtonBar/index.dart

@@ -55,7 +55,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDomes(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[

lib/widgets/components/Bar/FlexibleSpaceBar/index.dart

@@ -54,7 +54,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDomes(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[

lib/widgets/components/Bar/SliverAppBar/demo.dart

@@ -44,9 +44,9 @@ class SliverAppBarLessDefault extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     for (int i = 0; i < 20; i++) {
-      listData.add(new ListItem("我是测试标题$i", Icons.cake));
+      listData.add( ListItem("我是测试标题$i", Icons.cake));
     }
-    return new SizedBox(
+    return  SizedBox(
         height: 500.0,
         child: NestedScrollView(
           headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
@@ -89,7 +89,7 @@ class SliverAppBarLessDefault extends StatelessWidget {
   //            SliverPersistentHeader(
   //                delegate: _SliverAppBarDelegate(
   //                  TabBar(
-  //                    controller: new TabController(length: 2, vsync: this),
+  //                    controller:  TabController(length: 2, vsync: this),
   //                    labelColor: Colors.black87,
   //                    unselectedLabelColor: Colors.grey,
   //                    tabs: [
@@ -101,10 +101,10 @@ class SliverAppBarLessDefault extends StatelessWidget {
             ];
         },
       body: Center(
-        child: new ListView.builder(
+        child:  ListView.builder(
           shrinkWrap: true,
           itemBuilder: (BuildContext context, int index) {
-            return new ListItemWidget(listData[index]);
+            return  ListItemWidget(listData[index]);
           },
           itemCount: listData.length,
         ),
@@ -127,10 +127,10 @@ class ListItemWidget extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new InkWell(
-      child: new ListTile(
-        leading: new Icon(listItem.iconData),
-        title: new Text(listItem.title),
+    return  InkWell(
+      child:  ListTile(
+        leading:  Icon(listItem.iconData),
+        title:  Text(listItem.title),
       ),
       onTap: () {},
     );

lib/widgets/components/Bar/SliverAppBar/index.dart

@@ -54,7 +54,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDomes(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -71,7 +71,7 @@ Widget allDomes(BuildContext context, _DemoState that) {
 * 带align的text
 * */
 Widget textAlignBar(String txt) {
-  return new Align(
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[

lib/widgets/components/Bar/SnackBar/demo.dart

@@ -23,15 +23,15 @@ class SnackBarLessDefault extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     // 当BuildContext在Scaffold之前时，调用Scaffold.of(context)会报错。这时可以通过Builder Widget来解决
-    return new Center(
-        child: new Column(
+    return  Center(
+        child:  Column(
           children: <Widget>[
-            new GestureDetector(
+             GestureDetector(
               onTap: () {
-                final snackBar = new SnackBar(
-                  content: new Text('这是一个SnackBar, 右侧有SnackBarAction'),
+                final snackBar =  SnackBar(
+                  content:  Text('这是一个SnackBar, 右侧有SnackBarAction'),
                   backgroundColor:Colors.red,
-                  action: new SnackBarAction( // 提示信息上添加一个撤消的按钮
+                  action:  SnackBarAction( // 提示信息上添加一个撤消的按钮
                     textColor:Colors.black,
                     label: '撤消',
                     onPressed: () {
@@ -43,19 +43,19 @@ class SnackBarLessDefault extends StatelessWidget {
                 );
                 Scaffold.of(context).showSnackBar(snackBar);
               },
-              child: new Text('显示SnackBar'),
+              child:  Text('显示SnackBar'),
             ),
-            new GestureDetector(
+             GestureDetector(
               onTap: () {
-                final snackBar = new SnackBar(
-                  content: new Text('右侧无SnackBarAction'),
+                final snackBar =  SnackBar(
+                  content:  Text('右侧无SnackBarAction'),
                   backgroundColor:Colors.red,
                   duration:Duration(minutes: 1),// 持续时间
                   //animation,
                 );
                 Scaffold.of(context).showSnackBar(snackBar);
               },
-              child: new Text('显示无SnackBarAction的SnackBar'),
+              child:  Text('显示无SnackBarAction的SnackBar'),
             ),
           ],
         )

lib/widgets/components/Bar/SnackBar/index.dart

@@ -54,7 +54,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDomes(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -72,7 +72,7 @@ Widget allDomes(BuildContext context, _DemoState that) {
 * 带align的text
 * */
 Widget textAlignBar(String txt) {
-  return new Align(
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[

lib/widgets/components/Bar/SnackBarAction/demo.dart

@@ -16,15 +16,15 @@ class SnackBarActionDemo extends StatefulWidget {
 
 class _Demo extends State<SnackBarActionDemo> {
   Widget build(BuildContext context) {
-      return new Center(
-        child: new Column(
+      return  Center(
+        child:  Column(
           children: <Widget>[
-            new GestureDetector(
+             GestureDetector(
               onTap: () {
-                final snackBar = new SnackBar(
-                  content: new Text('这是一个SnackBar, 右侧有SnackBarAction, 3秒后消失'),
+                final snackBar =  SnackBar(
+                  content:  Text('这是一个SnackBar, 右侧有SnackBarAction, 3秒后消失'),
                   backgroundColor:Color(0xffc91b3a),
-                  action: new SnackBarAction( // 提示信息上添加一个撤消的按钮
+                  action:  SnackBarAction( // 提示信息上添加一个撤消的按钮
                     textColor:Colors.white,
                     label: '撤消',
                     onPressed: () {
@@ -37,19 +37,19 @@ class _Demo extends State<SnackBarActionDemo> {
                 Scaffold.of(context).showSnackBar(snackBar);
               },
              
-              child: new Text('点我显示有action的SnackBar'),
+              child:  Text('点我显示有action的SnackBar'),
             ),
-            new GestureDetector(
+             GestureDetector(
               onTap: () async {
-                final snackBar = new SnackBar(
-                  content: new Text('右侧无SnackBarAction, 3秒后消失'),
+                final snackBar =  SnackBar(
+                  content:  Text('右侧无SnackBarAction, 3秒后消失'),
                   backgroundColor:Color(0xffc91b3a),
                   duration:Duration(seconds: 3),// 持续时间
                   //animation,
                 );
                 Scaffold.of(context).showSnackBar(snackBar);
               },
-              child: new Text('点我显示无SnackBarAction的SnackBar'),
+              child:  Text('点我显示无SnackBarAction的SnackBar'),
             ),
           ],
         )

lib/widgets/components/Bar/TabBar/demo.dart

@@ -26,8 +26,8 @@ class _TabBarDemo extends State with SingleTickerProviderStateMixin {
   @override
   void initState() {
     super.initState();
-    _scrollViewController = new ScrollController();
-    _tabController = new TabController(vsync: this, length: 6);// 和下面的 TabBar.tabs 数量对应
+    _scrollViewController =  ScrollController();
+    _tabController =  TabController(vsync: this, length: 6);// 和下面的 TabBar.tabs 数量对应
   }
 
   @override
@@ -42,27 +42,27 @@ class _TabBarDemo extends State with SingleTickerProviderStateMixin {
     // 如果省略了 leading ，但 AppBar 在带有 Drawer 的 Scaffold 中，则会插入一个 button 以打开 Drawer。
     // 否则，如果最近的 Navigator 具有任何先前的 router ，则会插入BackButton。
     // 这种行为可以通过设置来关闭automaticallyImplyLeading 为false。在这种情况下，空的 leading widget 将导致 middle/title widget 拉伸开始。
-    return new SizedBox(
+    return  SizedBox(
       height: 500,
-      child:new Scaffold(
-        appBar: new AppBar( // 大量配置属性参考 SliverAppBar 示例
-          title: new Text('TabBar'),
-          leading: new Icon(Icons.home),
+      child: Scaffold(
+        appBar:  AppBar( // 大量配置属性参考 SliverAppBar 示例
+          title:  Text('TabBar'),
+          leading:  Icon(Icons.home),
           backgroundColor: Colors.amber[1000],
-          bottom: new TabBar(
+          bottom:  TabBar(
             isScrollable: true,
             controller: _tabController,
             tabs: <Widget>[
-              new Tab(text: "Tabs 1"),
-              new Tab(text: "Tabs 2"),
-              new Tab(text: "Tabs 3"),
-              new Tab(text: "Tabs 4"),
-              new Tab(text: "Tabs 5"),
-              new Tab(text: "Tabs 6"),
+               Tab(text: "Tabs 1"),
+               Tab(text: "Tabs 2"),
+               Tab(text: "Tabs 3"),
+               Tab(text: "Tabs 4"),
+               Tab(text: "Tabs 5"),
+               Tab(text: "Tabs 6"),
             ],
           ),
         ),
-        body: new TabBarView(controller: _tabController, children: <Widget>[
+        body:  TabBarView(controller: _tabController, children: <Widget>[
           Text('TabsView 1'),
           Text('TabsView 2'),
           Text('TabsView 3'),

lib/widgets/components/Card/Card/demo.dart

@@ -50,9 +50,9 @@ class CardLessDefault extends StatelessWidget {
       margin:EdgeInsets.all(20.0),
       //  margin: EdgeInsetsDirectional.only(bottom: 30.0, top: 30.0, start: 30.0),// 边距
       semanticContainer:true, // 表示单个语义容器，还是false表示单个语义节点的集合，接受单个child，但该child可以是Row，Column或其他包含子级列表的widget
-//      shape:new Border.all(
+//      shape: Border.all(
 //          color: Colors.indigo, width: 1.0, style: BorderStyle.solid), // 卡片材质的形状，以及边框
-      shape:RoundedRectangleBorder(borderRadius: new BorderRadius.circular(20.0)), // 圆角
+      shape:RoundedRectangleBorder(borderRadius:  BorderRadius.circular(20.0)), // 圆角
       //borderRadius: BorderRadius.all(Radius.circular(8.0)),
       child: Column( //card里面的子控件
         mainAxisSize: MainAxisSize.min,

lib/widgets/components/Card/Card/index.dart

@@ -52,7 +52,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDomes(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[

lib/widgets/components/Dialog/AboutDialog/demo.dart

@@ -19,9 +19,9 @@ class _Demo extends State<AboutDialogDemo> {
   void showAlertDialog(BuildContext context) {
     showDialog(
         context: context,
-        builder: (_) => new AboutDialog(
+        builder: (_) =>  AboutDialog(
           applicationName: '名称',
-          applicationIcon: new Icon(Icons.ac_unit),
+          applicationIcon:  Icon(Icons.ac_unit),
           applicationVersion: 'V1.0',
           children: <Widget>[
             Text('我是一个关于的dialog')
@@ -29,12 +29,12 @@ class _Demo extends State<AboutDialogDemo> {
         ));
   }
   Widget build(BuildContext context) {
-    return new RaisedButton(
-        padding: new EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
+    return  RaisedButton(
+        padding:  EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
         //padding
-        child: new Text(
+        child:  Text(
           'show aboutDialog',
-          style: new TextStyle(
+          style:  TextStyle(
             fontSize: 18.0, //textsize
             color: Colors.white, // textcolor
           ),

lib/widgets/components/Dialog/AlertDialog/demo.dart

@@ -119,12 +119,12 @@ class AlertDialogDemo extends StatelessWidget{
     );
   }
   Widget build(BuildContext context) {
-    return new RaisedButton(
-        padding: new EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
+    return  RaisedButton(
+        padding:  EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
         //padding
-        child: new Text(
+        child:  Text(
           '点我显示 AlertDialog',
-          style: new TextStyle(
+          style:  TextStyle(
             fontSize: 18.0, //textsize
             color: Colors.white, // textcolor
           ),

lib/widgets/components/Dialog/Dialog/demo.dart

@@ -42,12 +42,12 @@ class _Demo extends State<DialogDemo> {
     );
   }
   Widget build(BuildContext context) {
-    return new RaisedButton(
-        padding: new EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
+    return  RaisedButton(
+        padding:  EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
         //padding
-        child: new Text(
+        child:  Text(
           '点我显示 Dialog',
-          style: new TextStyle(
+          style:  TextStyle(
             fontSize: 18.0, //textsize
             color: Colors.white, // textcolor
           ),
@@ -108,14 +108,14 @@ class _DialogMoreDemo extends State<DialogMoreDemo> {
     );
   }
   Widget build(BuildContext context) {
-    return new Column(
+    return  Column(
       children: <Widget>[
-        new RaisedButton(
-          padding: new EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
+         RaisedButton(
+          padding:  EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
           //padding
-          child: new Text(
+          child:  Text(
           '点我显示Dialog',
-          style: new TextStyle(
+          style:  TextStyle(
             fontSize: 18.0, //textsize
             color: Colors.white, // textcolor
           ),

lib/widgets/components/Dialog/SimpleDialog/demo.dart

@@ -20,17 +20,17 @@ class _Demo extends State<SimpleDialogDemo> {
     showDialog<Null>(
       context: context,
       builder: (BuildContext context) {
-        return new SimpleDialog(
-          title: new Text('选择'),
+        return  SimpleDialog(
+          title:  Text('选择'),
           children: <Widget>[
-            new SimpleDialogOption(
-              child: new Text('选项 1'),
+             SimpleDialogOption(
+              child:  Text('选项 1'),
               onPressed: () {
                 Navigator.of(context).pop();
               },
             ),
-            new SimpleDialogOption(
-              child: new Text('选项 2'),
+             SimpleDialogOption(
+              child:  Text('选项 2'),
               onPressed: () {
                 Navigator.of(context).pop();
               },
@@ -41,12 +41,12 @@ class _Demo extends State<SimpleDialogDemo> {
     );
   }
   Widget build(BuildContext context) {
-    return new RaisedButton(
-        padding: new EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
+    return  RaisedButton(
+        padding:  EdgeInsets.fromLTRB(10.0, 10.0, 10.0, 10.0),
         //padding
-        child: new Text(
+        child:  Text(
           'show SimpleDialog',
-          style: new TextStyle(
+          style:  TextStyle(
             fontSize: 18.0, //textsize
             color: Colors.white, // textcolor
           ),

lib/widgets/components/Grid/GridPaper/demo.dart

@@ -21,7 +21,7 @@ class _Demo extends State<GridPaperDemo> {
     return Container(
       height: 400,
       color: Color(0xffc91b3a),
-      child:  new GridView.count(
+      child:   GridView.count(
           crossAxisCount: 2,
           mainAxisSpacing: 10.0,
           crossAxisSpacing: 4.0,
@@ -40,21 +40,21 @@ class _Demo extends State<GridPaperDemo> {
           ),
           GridPaper(
             color: Colors.red,
-            child: new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+            child:  Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
           ),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
         ],
       )
     );

lib/widgets/components/Grid/GridTile/demo.dart

@@ -21,7 +21,7 @@ class _Demo extends State<GridTileDemo> {
     return Container(
       height: 400,
       color: Color(0xffc91b3a),
-      child:  new GridView.count(
+      child:   GridView.count(
           crossAxisCount: 2,
           mainAxisSpacing: 10.0,
           crossAxisSpacing: 4.0,
@@ -36,21 +36,21 @@ class _Demo extends State<GridTileDemo> {
             ),
             footer: Text("GridTile footer", style: TextStyle(color: Colors.white)),
           ),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
         ],
       )
     );

lib/widgets/components/Grid/GridTileBar/demo.dart

@@ -21,7 +21,7 @@ class _Demo extends State<GridTileDemo> {
     return Container(
       height: 400,
       color: Color(0xffc91b3a),
-      child:  new GridView.count(
+      child:   GridView.count(
           crossAxisCount: 2,
           mainAxisSpacing: 10.0,
           crossAxisSpacing: 4.0,
@@ -38,21 +38,21 @@ class _Demo extends State<GridTileDemo> {
             child: Container(),
 
           ),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
         ],
       )
     );

lib/widgets/components/Grid/GridView/demo.dart

@@ -21,7 +21,7 @@ class _Demo extends State<GridTileDemo> {
     return Container(
       height: 400,
       color: Color(0xffc91b3a),
-      child:  new GridView.count(
+      child:   GridView.count(
           crossAxisCount: 2,
           mainAxisSpacing: 10.0,
           crossAxisSpacing: 4.0,
@@ -38,21 +38,21 @@ class _Demo extends State<GridTileDemo> {
             child: Container(),
 
           ),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
-          new Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
+           Image.network('https://flutter.io/assets/homepage/news-2-599aefd56e8aa903ded69500ef4102cdd8f988dab8d9e4d570de18bdb702ffd4.png', scale: 1, fit: BoxFit.cover),
         ],
       )
     );

lib/widgets/components/Grid/SliverGrid/demo.dart

@@ -17,34 +17,34 @@ class SliverGridDemo extends StatefulWidget {
 class _Demo extends State<SliverGridDemo> {
 
   Widget showCustomScrollView() {
-    return new CustomScrollView(
+    return  CustomScrollView(
       slivers: <Widget>[
-        new SliverGrid(
-          gridDelegate: new SliverGridDelegateWithMaxCrossAxisExtent(
+         SliverGrid(
+          gridDelegate:  SliverGridDelegateWithMaxCrossAxisExtent(
             maxCrossAxisExtent: 200.0,
             mainAxisSpacing: 10.0,
             crossAxisSpacing: 10.0,
             childAspectRatio: 4.0,
           ),
-          delegate: new SliverChildBuilderDelegate(
+          delegate:  SliverChildBuilderDelegate(
                 (BuildContext context, int index) {
-              return new Container(
+              return  Container(
                 alignment: Alignment.center,
                 color: Colors.cyan[100 * (index % 5)],
-                child: new Text('grid item $index'),
+                child:  Text('grid item $index'),
               );
             },
             childCount: 20,
           ),
         ),
-//        new SliverFixedExtentList(
+//         SliverFixedExtentList(
 //          itemExtent: 100.0,
-//          delegate: new SliverChildBuilderDelegate(
+//          delegate:  SliverChildBuilderDelegate(
 //                (BuildContext context, int index) {
-//              return new Container(
+//              return  Container(
 //                alignment: Alignment.center,
 //                color: Colors.lightBlue[100 * (index % 9)],
-//                child: new Text('list item $index'),
+//                child:  Text('list item $index'),
 //              );
 //            },
 //          ),

lib/widgets/components/LIst/AnimatedList/demo.dart

@@ -15,7 +15,7 @@ class AnimatedListFullDefault extends StatefulWidget {
 * AnimatedList 默认的实例,有状态
 * */
 class _AnimatedListFullDefault extends State<AnimatedListFullDefault> {
-  final GlobalKey<AnimatedListState> _listKey = new GlobalKey<AnimatedListState>();
+  final GlobalKey<AnimatedListState> _listKey =  GlobalKey<AnimatedListState>();
   ListModel<int> _list;
   int _selectedItem;
   int _nextItem; // The next item inserted when the user presses the '+' button.
@@ -26,7 +26,7 @@ class _AnimatedListFullDefault extends State<AnimatedListFullDefault> {
     if (widget.parent is State) {
       widget.parent.animatedList = this; // 修改父级的对象引用
     }
-    _list = new ListModel<int>(
+    _list =  ListModel<int>(
       listKey: _listKey,
       initialItems: <int>[0, 1, 2],
       removedItemBuilder: _buildRemovedItem,
@@ -50,7 +50,7 @@ class _AnimatedListFullDefault extends State<AnimatedListFullDefault> {
   }
 
   Widget _buildItem(BuildContext context, int index, Animation<double> animation) {
-    return new CardItem(
+    return  CardItem(
       animation: animation,
       item: _list[index],
       selected: _selectedItem == _list[index],
@@ -63,7 +63,7 @@ class _AnimatedListFullDefault extends State<AnimatedListFullDefault> {
   }
 
   Widget _buildRemovedItem(int item, BuildContext context, Animation<double> animation) {
-    return new CardItem(
+    return  CardItem(
       animation: animation,
       item: item,
       selected: false,
@@ -107,20 +107,20 @@ class CardItem extends StatelessWidget {
     TextStyle textStyle = Theme.of(context).textTheme.display1;
     if (selected)
       textStyle = textStyle.copyWith(color: Colors.lightGreenAccent[400]);
-    return new Padding(
+    return  Padding(
       padding: const EdgeInsets.all(2.0),
-      child: new SizeTransition(
+      child:  SizeTransition(
         axis: Axis.vertical,
         sizeFactor: animation,
-        child: new GestureDetector(
+        child:  GestureDetector(
           behavior: HitTestBehavior.opaque,
           onTap: onTap,
-          child: new SizedBox(
+          child:  SizedBox(
             height: 128.0,
-            child: new Card(
+            child:  Card(
               color: Colors.primaries[item % Colors.primaries.length],
-              child: new Center(
-                child: new Text('Item $item', style: textStyle),
+              child:  Center(
+                child:  Text('Item $item', style: textStyle),
               ),
             ),
           ),

lib/widgets/components/LIst/AnimatedList/index.dart

@@ -58,7 +58,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDemoBoxs(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[

lib/widgets/components/LIst/AnimatedList/model.dart

@@ -25,7 +25,7 @@ class ListModel<E> {
     Iterable<E> initialItems,
   }) : assert(listKey != null),
         assert(removedItemBuilder != null),
-        _items = new List<E>.from(initialItems ?? <E>[]);
+        _items =  List<E>.from(initialItems ?? <E>[]);
 
   final GlobalKey<AnimatedListState> listKey;
   final dynamic removedItemBuilder;

lib/widgets/components/LIst/ListBody/index.dart

@@ -55,7 +55,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allCheckboxs(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[

lib/widgets/components/LIst/ListView/index.dart

@@ -81,7 +81,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allCheckboxs(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -107,7 +107,7 @@ Widget allCheckboxs(BuildContext context, _DemoState that) {
 * 带align的text
 * */
 Widget textAlignBar(String txt) {
-  return new Align(
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[

lib/widgets/components/Menu/CheckedPopupMenuItem/demo.dart

@@ -36,8 +36,8 @@ class _CheckedPopupMenuItemDemoState extends State<CheckedPopupMenuItemDemo> {
       _checkedValues.add(value);
     }
    
-    Scaffold.of(context).showSnackBar(new SnackBar(
-                content: new Text('Checked $_checkedValues')));
+    Scaffold.of(context).showSnackBar( SnackBar(
+                content:  Text('Checked $_checkedValues')));
   }
 
   @override

lib/widgets/components/Menu/PopupMenuButton/demo.dart

@@ -19,8 +19,8 @@ class _PopupMenuButtonDemoState extends State<PopupMenuButtonDemo> {
   void showMenuSelection(String value) {
     if (<String>[_simpleValue1, _simpleValue2, _simpleValue3].contains(value))
       _simpleValue = value;
-       Scaffold.of(context).showSnackBar(new SnackBar(
-                content: new Text('You selected: $value')));
+       Scaffold.of(context).showSnackBar( SnackBar(
+                content:  Text('You selected: $value')));
   }
 
 

lib/widgets/components/Menu/PopupMenuDivider/demo.dart

@@ -13,7 +13,7 @@ class PopupMenuDividerDemo extends StatefulWidget {
 class _PopupMenuDividerDemoState extends State<PopupMenuDividerDemo> {
   void showInSnackBar(String value) {
     Scaffold.of(context)
-        .showSnackBar(new SnackBar(content: new Text('You selected: $value')));
+        .showSnackBar( SnackBar(content:  Text('You selected: $value')));
   }
 
   @override

lib/widgets/components/Menu/PopupMenuDivider/index.dart

@@ -18,7 +18,7 @@ const String content0 = '''
 const String content1 = '''
 ### **基本用法**
 > 此widget通过调整Divider widget 来适应于弹出菜单中
-- 在 PopupMenuButton 中直接 new PopupMenuDivider() 即可
+- 在 PopupMenuButton 中直接  PopupMenuDivider() 即可
 ''';
 
 class Demo extends StatefulWidget {

lib/widgets/components/Navigation/BottomNavigationBar/demo.dart

@@ -40,17 +40,17 @@ class _BottomNavigationBarFullDefault extends State {
       fixedColor: Colors.deepPurple, // 如果 type 类型为 fixed，则通过 fixedColor 设置选中 item 的颜色
       items: <BottomNavigationBarItem> [
         BottomNavigationBarItem(
-            title: new Text("Home"), icon: new Icon(Icons.home)),
+            title:  Text("Home"), icon:  Icon(Icons.home)),
         BottomNavigationBarItem(
-            title: new Text("List"), icon: new Icon(Icons.list)),
+            title:  Text("List"), icon:  Icon(Icons.list)),
         BottomNavigationBarItem(
-            title: new Text("Message"), icon: new Icon(Icons.message)),
+            title:  Text("Message"), icon:  Icon(Icons.message)),
         BottomNavigationBarItem(
-            title: new Text("add"), icon: new Icon(Icons.add)),
+            title:  Text("add"), icon:  Icon(Icons.add)),
         BottomNavigationBarItem(
-            title: new Text("menu"), icon: new Icon(Icons.menu)),
+            title:  Text("menu"), icon:  Icon(Icons.menu)),
         BottomNavigationBarItem(
-            title: new Text("other"), icon: new Icon(Icons.devices_other)),
+            title:  Text("other"), icon:  Icon(Icons.devices_other)),
 
       ],
     );

lib/widgets/components/Navigation/BottomNavigationBar/index.dart

@@ -57,7 +57,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDemoBoxs(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -79,7 +79,7 @@ Widget allDemoBoxs(BuildContext context, _DemoState that) {
 * 带align的text
 * */
 Widget textAlignBar(String txt) {
-  return new Align(
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[

lib/widgets/components/Navigation/BottomNavigationBarItem/demo.dart

@@ -21,20 +21,20 @@ class BottomNavigationBarItemLessDefault extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new SizedBox(
+    return  SizedBox(
         height: 100,
         child: Scaffold(
-          bottomNavigationBar: new BottomNavigationBar(items: [
-            new BottomNavigationBarItem(
-                icon: new Icon(Icons.laptop_chromebook),
-                title: new Text("主页"),
+          bottomNavigationBar:  BottomNavigationBar(items: [
+             BottomNavigationBarItem(
+                icon:  Icon(Icons.laptop_chromebook),
+                title:  Text("主页"),
                 backgroundColor: Colors.red
             ),
-            new BottomNavigationBarItem(
-                icon: new Icon(Icons.list), title: new Text("分类"),backgroundColor: Colors.grey),
-            new BottomNavigationBarItem(
-                icon: new Icon(Icons.local_grocery_store), title: new Text("购物车")),
-            new BottomNavigationBarItem(icon: new Icon(Icons.person), title: new Text("我的"))
+             BottomNavigationBarItem(
+                icon:  Icon(Icons.list), title:  Text("分类"),backgroundColor: Colors.grey),
+             BottomNavigationBarItem(
+                icon:  Icon(Icons.local_grocery_store), title:  Text("购物车")),
+             BottomNavigationBarItem(icon:  Icon(Icons.person), title:  Text("我的"))
           ],
             //onTap: onTap,
             //currentIndex: page
@@ -46,13 +46,13 @@ class BottomNavigationBarItemLessDefault extends StatelessWidget {
 
 //backgroundColor: Colors.grey,
 //
-////      body: new PageView(
+////      body:  PageView(
 ////
 ////          children: [
-////            new Index(),
-////            new Classify(),
-////            new Shopping(),
-////            new Myself()
+////             Index(),
+////             Classify(),
+////             Shopping(),
+////             Myself()
 ////          ],
 ////
 ////          controller: pageController,

lib/widgets/components/Navigation/BottomNavigationBarItem/index.dart

@@ -52,7 +52,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allCheckboxs(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -70,7 +70,7 @@ Widget allCheckboxs(BuildContext context, _DemoState that) {
 * 带align的text
 * */
 Widget textAlignBar(String txt) {
-  return new Align(
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[

lib/widgets/components/Pick/DayPicker/demo.dart

@@ -14,8 +14,8 @@ class DayPickerDemo extends StatefulWidget {
 }
 
 class _DayPickerState extends State<DayPickerDemo> {
-  DateTime _date = new DateTime.now();
-  TimeOfDay _time = new TimeOfDay.now();
+  DateTime _date =  DateTime.now();
+  TimeOfDay _time =  TimeOfDay.now();
 
   Future<void> _selectDate(BuildContext context) async {
     final DateTime picked = await showDatePicker(
@@ -29,7 +29,7 @@ class _DayPickerState extends State<DayPickerDemo> {
       _date = picked;
     });
 
-    if (picked == null) _date = new DateTime.now();
+    if (picked == null) _date =  DateTime.now();
   }
 
   Future<void> _selectTime(BuildContext context) async {
@@ -40,23 +40,23 @@ class _DayPickerState extends State<DayPickerDemo> {
     setState(() {
       _time = picked;
     });
-    if (picked == null) _time = new TimeOfDay.now();
+    if (picked == null) _time =  TimeOfDay.now();
   }
 
   @override
   Widget build(BuildContext context) {
-    return new Column(
+    return  Column(
       children: <Widget>[
-        new Text('日期选择'),
-        new RaisedButton(
-          child: new Text('date selected:${_date.toString()}'),
+         Text('日期选择'),
+         RaisedButton(
+          child:  Text('date selected:${_date.toString()}'),
           onPressed: () {
             _selectDate(context);
           },
         ),
-        new Text('时间选择'),
-        new RaisedButton(
-          child: new Text('date selected:${_time.toString()}'),
+         Text('时间选择'),
+         RaisedButton(
+          child:  Text('date selected:${_time.toString()}'),
           onPressed: () {
             _selectTime(context);
           },

lib/widgets/components/Pick/MonthPicker/demo.dart

@@ -14,7 +14,7 @@ class MothPickerDemo extends StatefulWidget {
 }
 
 class _MothPickerState extends State<MothPickerDemo> {
-  DateTime _date = new DateTime.now();
+  DateTime _date =  DateTime.now();
 
   Future<void> _selectDate(BuildContext context) async {
     final DateTime picked = await showDatePicker(
@@ -28,16 +28,16 @@ class _MothPickerState extends State<MothPickerDemo> {
       _date = picked;
     });
 
-    if (picked == null) _date = new DateTime.now();
+    if (picked == null) _date =  DateTime.now();
   }
 
   @override
   Widget build(BuildContext context) {
-    return new Column(
+    return  Column(
       children: <Widget>[
-        new Text('日期选择'),
-        new RaisedButton(
-          child: new Text('date selected:${_date.toString()}'),
+         Text('日期选择'),
+         RaisedButton(
+          child:  Text('date selected:${_date.toString()}'),
           onPressed: () {
             _selectDate(context);
           },

lib/widgets/components/Pick/ShowdatePicker/demo.dart

@@ -14,8 +14,8 @@ class ShowDatePickerDemo extends StatefulWidget {
 }
 
 class _ShowDatePickerState extends State<ShowDatePickerDemo> {
-  DateTime _date = new DateTime.now();
-  TimeOfDay _time = new TimeOfDay.now();
+  DateTime _date =  DateTime.now();
+  TimeOfDay _time =  TimeOfDay.now();
 
   Future<void> _selectDate(BuildContext context) async {
     final DateTime picked = await showDatePicker(
@@ -29,7 +29,7 @@ class _ShowDatePickerState extends State<ShowDatePickerDemo> {
       _date = picked;
     });
 
-    if (picked == null) _date = new DateTime.now();
+    if (picked == null) _date =  DateTime.now();
   }
 
   Future<void> _selectTime(BuildContext context) async {
@@ -40,23 +40,23 @@ class _ShowDatePickerState extends State<ShowDatePickerDemo> {
     setState(() {
       _time = picked;
     });
-    if (picked == null) _time = new TimeOfDay.now();
+    if (picked == null) _time =  TimeOfDay.now();
   }
 
   @override
   Widget build(BuildContext context) {
-    return new Column(
+    return  Column(
       children: <Widget>[
-        new Text('日期选择'),
-        new RaisedButton(
-          child: new Text('date selected:${_date.toString()}'),
+         Text('日期选择'),
+         RaisedButton(
+          child:  Text('date selected:${_date.toString()}'),
           onPressed: () {
             _selectDate(context);
           },
         ),
-        new Text('时间选择'),
-        new RaisedButton(
-          child: new Text('date selected:${_time.toString()}'),
+         Text('时间选择'),
+         RaisedButton(
+          child:  Text('date selected:${_time.toString()}'),
           onPressed: () {
             _selectTime(context);
           },

lib/widgets/components/Pick/YearPicker/demo.dart

@@ -14,7 +14,7 @@ class YearPickerDemo extends StatefulWidget {
 }
 
 class _YearPickerDemoState extends State<YearPickerDemo> {
-  DateTime _date = new DateTime.now();
+  DateTime _date =  DateTime.now();
 
   Future<void> _selectDate(BuildContext context) async {
     final DateTime picked = await showDatePicker(
@@ -28,16 +28,16 @@ class _YearPickerDemoState extends State<YearPickerDemo> {
       _date = picked;
     });
 
-    if (picked == null) _date = new DateTime.now();
+    if (picked == null) _date =  DateTime.now();
   }
 
   @override
   Widget build(BuildContext context) {
-    return new Column(
+    return  Column(
       children: <Widget>[
-        new Text('日期选择'),
-        new RaisedButton(
-          child: new Text('date selected:${_date.toString()}'),
+         Text('日期选择'),
+         RaisedButton(
+          child:  Text('date selected:${_date.toString()}'),
           onPressed: () {
             _selectDate(context);
           },

lib/widgets/components/Scaffold/Scaffold/demo.dart

@@ -37,9 +37,9 @@ class _ScaffoldDemo extends State with SingleTickerProviderStateMixin {
     // 如果省略了 leading ，但 AppBar 在带有 Drawer 的 Scaffold 中，则会插入一个 button 以打开 Drawer。
     // 否则，如果最近的 Navigator 具有任何先前的 router ，则会插入BackButton。
     // 这种行为可以通过设置来关闭automaticallyImplyLeading 为false。在这种情况下，空的 leading widget 将导致 middle/title widget 拉伸开始。
-    return new SizedBox(
+    return  SizedBox(
         height: 500,
-        child: new Scaffold(
+        child:  Scaffold(
           appBar: AppBar(
             title: Text('Sample Code'),
           ),

lib/widgets/components/Scaffold/Scaffold/index.dart

@@ -56,7 +56,7 @@ class _DemoState extends State<Demo> {
       codeUrl: 'components/Scaffold/Scaffold/demo.dart',
       contentList: [
         _Text0,
-        new ScaffoldDemo(),
+         ScaffoldDemo(),
       ],
       docUrl: 'https://docs.flutter.io/flutter/material/Scaffold-class.html',
     );

lib/widgets/components/Scaffold/ScaffoldState/demo.dart

@@ -28,9 +28,9 @@ class _ScaffoldStateDemo extends State with SingleTickerProviderStateMixin {
     // 如果省略了 leading ，但 AppBar 在带有 Drawer 的 Scaffold 中，则会插入一个 button 以打开 Drawer。
     // 否则，如果最近的 Navigator 具有任何先前的 router ，则会插入BackButton。
     // 这种行为可以通过设置来关闭automaticallyImplyLeading 为false。在这种情况下，空的 leading widget 将导致 middle/title widget 拉伸开始。
-    return new SizedBox(
+    return  SizedBox(
         height: 500,
-        child:new Scaffold(
+        child: Scaffold(
           key:_scaffoldKey,
           appBar: AppBar(
             title: Text('ScaffoldState Demo'),

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

@@ -11,7 +11,7 @@ class ScrollPhysicsDemo extends StatefulWidget {
 }
 
 class _ScrollPhysicsDemoState extends State<ScrollPhysicsDemo> {
-  final PageController _pageController = new PageController();
+  final PageController _pageController =  PageController();
   double _currentPage = 0.0;
 
   @override
@@ -54,21 +54,21 @@ class _SimplePage extends StatelessWidget {
   final double parallaxOffset;
 
   @override
-  Widget build(BuildContext context) => new Center(
+  Widget build(BuildContext context) =>  Center(
         child: Container(
           color: Theme.of(context).primaryColor,
-          child: new Center(
-            child: new Column(
+          child:  Center(
+            child:  Column(
               mainAxisSize: MainAxisSize.min,
               children: <Widget>[
-                new Text(
+                 Text(
                   data,
                   style: const TextStyle(fontSize: 60.0,color: Colors.white),
                 ),
-                new SizedBox(height: 40.0),
-                new Transform(
+                 SizedBox(height: 40.0),
+                 Transform(
                   transform:
-                      new Matrix4.translationValues(parallaxOffset, 0.0, 0.0),
+                       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/elements/Form/Button/DropdownButton/demo.dart

@@ -17,15 +17,15 @@ var selectItemValue;
 
 class DropdownButtonDefault extends StatelessWidget {
    List<DropdownMenuItem> generateItemList() {
-    final List<DropdownMenuItem> items = new List();
-    final DropdownMenuItem item1 = new DropdownMenuItem(
-        value: '张三', child: new Text('张三'));
-    final DropdownMenuItem item2 = new DropdownMenuItem(
-        value: '李四', child: new Text('李四'));
-    final DropdownMenuItem item3 = new DropdownMenuItem(
-        value: '王二', child: new Text('王二'));
-    final DropdownMenuItem item4 = new DropdownMenuItem(
-        value: '麻子', child: new Text('麻子'));
+    final List<DropdownMenuItem> items =  List();
+    final DropdownMenuItem item1 =  DropdownMenuItem(
+        value: '张三', child:  Text('张三'));
+    final DropdownMenuItem item2 =  DropdownMenuItem(
+        value: '李四', child:  Text('李四'));
+    final DropdownMenuItem item3 =  DropdownMenuItem(
+        value: '王二', child:  Text('王二'));
+    final DropdownMenuItem item4 =  DropdownMenuItem(
+        value: '麻子', child:  Text('麻子'));
     items.add(item1);
     items.add(item2);
     items.add(item3);
@@ -36,7 +36,7 @@ class DropdownButtonDefault extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return DropdownButton(
-        hint: new Text('下拉菜单选择一个人名'),
+        hint:  Text('下拉菜单选择一个人名'),
         //设置这个value之后,选中对应位置的item，
         //再次呼出下拉菜单，会自动定位item位置在当前按钮显示的位置处
         value: selectItValue,
@@ -51,54 +51,54 @@ class DropdownButtonDefault extends StatelessWidget {
 }
 
 List<DropdownMenuItem> getListData(){
-  List<DropdownMenuItem> items=new List();
-  DropdownMenuItem dropdownMenuItem1=new DropdownMenuItem(
-    child:new Text('1'),
+  List<DropdownMenuItem> items= List();
+  DropdownMenuItem dropdownMenuItem1= DropdownMenuItem(
+    child: Text('1'),
     value: '1',
   );
   items.add(dropdownMenuItem1);
-  DropdownMenuItem dropdownMenuItem2=new DropdownMenuItem(
-    child:new Text('2'),
+  DropdownMenuItem dropdownMenuItem2= DropdownMenuItem(
+    child: Text('2'),
     value: '2',
   );
   items.add(dropdownMenuItem2);
-  DropdownMenuItem dropdownMenuItem3=new DropdownMenuItem(
-    child:new Text('3'),
+  DropdownMenuItem dropdownMenuItem3= DropdownMenuItem(
+    child: Text('3'),
     value: '3',
   );
   items.add(dropdownMenuItem3);
-  DropdownMenuItem dropdownMenuItem4=new DropdownMenuItem(
-    child:new Text('4'),
+  DropdownMenuItem dropdownMenuItem4= DropdownMenuItem(
+    child: Text('4'),
     value: '4',
   );
   items.add(dropdownMenuItem4);
-  DropdownMenuItem dropdownMenuItem5=new DropdownMenuItem(
-    child:new Text('5'),
+  DropdownMenuItem dropdownMenuItem5= DropdownMenuItem(
+    child: Text('5'),
     value: '5',
   );
   items.add(dropdownMenuItem5);
-  DropdownMenuItem dropdownMenuItem6=new DropdownMenuItem(
-    child:new Text('6'),
+  DropdownMenuItem dropdownMenuItem6= DropdownMenuItem(
+    child: Text('6'),
     value: '6',
   );
   items.add(dropdownMenuItem6);
-  DropdownMenuItem dropdownMenuItem7=new DropdownMenuItem(
-    child:new Text('7'),
+  DropdownMenuItem dropdownMenuItem7= DropdownMenuItem(
+    child: Text('7'),
     value: '7',
   );
   items.add(dropdownMenuItem7);
-  DropdownMenuItem dropdownMenuItem8=new DropdownMenuItem(
-    child:new Text('8'),
+  DropdownMenuItem dropdownMenuItem8= DropdownMenuItem(
+    child: Text('8'),
     value: '8',
   );
   items.add(dropdownMenuItem8);
-  DropdownMenuItem dropdownMenuItem9=new DropdownMenuItem(
-    child:new Text('9'),
+  DropdownMenuItem dropdownMenuItem9= DropdownMenuItem(
+    child: Text('9'),
     value: '9',
   );
   items.add(dropdownMenuItem9);
-  DropdownMenuItem dropdownMenuItem10=new DropdownMenuItem(
-    child:new Text('10'),
+  DropdownMenuItem dropdownMenuItem10= DropdownMenuItem(
+    child: Text('10'),
     value: '10',
   );
   items.add(dropdownMenuItem10);

lib/widgets/elements/Form/Button/DropdownButton/index.dart

@@ -62,7 +62,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allDropdownButtons(BuildContext context,_DemoState that){
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -87,14 +87,14 @@ Widget allDropdownButtons(BuildContext context,_DemoState that){
 * 带align的text
 * */
 Widget textAlignBar(String txt){
-  //style: new TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
-  return new Align(
+  //style:  TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[
             SizedBox(height: 20.0),
             MarkdownBody(data: txt)
-            //new Text(txt, style: new TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
+            // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
           ])
   );
 }

lib/widgets/elements/Form/Button/FlatButton/demo.dart

@@ -101,9 +101,9 @@ class FlatButtonCustom extends StatelessWidget {
         splashColor: Colors.deepPurple,
         // 抗锯齿能力,抗锯齿等级依次递增,none（默认),hardEdge,antiAliasWithSaveLayer,antiAlias
         clipBehavior: Clip.antiAlias,
-        padding: new EdgeInsets.only(
+        padding:  EdgeInsets.only(
             bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
-        shape: (shape is ShapeBorder) ? shape : new Border.all(
+        shape: (shape is ShapeBorder) ? shape :  Border.all(
           // 设置边框样式
           color: Colors.grey,
           width: 2.0,

lib/widgets/elements/Form/Button/FlatButton/index.dart

@@ -64,7 +64,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allFlatButtons(BuildContext context){
   return Container(
-      //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+      //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
           //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -109,7 +109,7 @@ Widget allFlatButtons(BuildContext context){
             flatButton.FlatButtonCustom('危险按钮',Colors.pink),
             SizedBox(height: 10.0),
             flatButton.FlatButtonCustom('点击我试试！', Colors.red,
-                new Border.all(color: Colors.brown, width: 5.0, style: BorderStyle.solid),
+                 Border.all(color: Colors.brown, width: 5.0, style: BorderStyle.solid),
                     () => _showMessage('点击了 FLAT BUTTON ', context)),
             SizedBox(height: 20.0)
           ])
@@ -126,16 +126,16 @@ void _showMessage(String name, BuildContext context) {
     context: context,
     builder: (BuildContext context) {
       return AlertDialog(
-          title: new Text('提示'),
-          content: new Text(name),
+          title:  Text('提示'),
+          content:  Text(name),
           actions: <Widget>[
-            new FlatButton(
+             FlatButton(
               // alert 的取消按钮
                 onPressed: () {
                   // 取消的事件
                   Navigator.of(context).pop(true);
                 },
-                child: new Text('取消'))
+                child:  Text('取消'))
           ]);
     }
   );
@@ -145,14 +145,14 @@ void _showMessage(String name, BuildContext context) {
 * 带align的text
 * */
 Widget textAlignBar(String txt){
-  //style: new TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
-  return new Align(
+  //style:  TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
+  return  Align(
     alignment: FractionalOffset.centerLeft,
     child: Column(
       children: <Widget>[
         SizedBox(height: 20.0),
         MarkdownBody(data: txt)
-        //new Text(txt, style: new TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
+        // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
       ])
   );
 }

lib/widgets/elements/Form/Button/FloatingActionButton/demo.dart

@@ -49,7 +49,7 @@ class FloatingActionButtonCustom extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final _onPressed = onPressed;
-    return new FloatingActionButton(
+    return  FloatingActionButton(
       // 子视图，一般为Icon，不推荐使用文字
       child: const Icon(Icons.refresh),
       // FAB的文字解释，FAB被长按时显示，也是无障碍功能
@@ -109,8 +109,8 @@ class FloatingActionButtonCustom2 extends StatelessWidget {
       foregroundColor: Colors.white,
       backgroundColor: Colors.amber,
       //如果不手动设置icon和text颜色,则默认使用foregroundColor颜色
-      icon: new Icon(Icons.flag,color: Colors.red),
-      label: new Text('FloatingActionButton.extended', maxLines: 1),
+      icon:  Icon(Icons.flag,color: Colors.red),
+      label:  Text('FloatingActionButton.extended', maxLines: 1),
     );
   }
 }

lib/widgets/elements/Form/Button/FloatingActionButton/index.dart

@@ -72,7 +72,7 @@ class _DemoState extends State<Demo> {
 Widget allFloatingActionButtons(BuildContext context,_DemoState that){
   final ShapeBorder buttonShape = drawShape(that.buttonShapeType);
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -109,16 +109,16 @@ Widget allFloatingActionButtons(BuildContext context,_DemoState that){
 //     context: context,
 //     builder: (BuildContext context) {
 //       return AlertDialog(
-//           title: new Text('提示'),
-//           content: new Text(name),
+//           title:  Text('提示'),
+//           content:  Text(name),
 //           actions: <Widget>[
-//             new FlatButton(
+//              FlatButton(
 //               // alert 的取消按钮
 //                 onPressed: () {
 //                   // 取消的事件
 //                   Navigator.of(context).pop(true);
 //                 },
-//                 child: new Text('取消'))
+//                 child:  Text('取消'))
 //           ]);
 //     }
 //   );
@@ -128,14 +128,14 @@ Widget allFloatingActionButtons(BuildContext context,_DemoState that){
 * 带align的text
 * */
 Widget textAlignBar(String txt){
-  //style: new TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
-  return new Align(
+  //style:  TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[
             SizedBox(height: 20.0),
             MarkdownBody(data: txt)
-            //new Text(txt, style: new TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
+            // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
           ])
   );
 }
@@ -159,7 +159,7 @@ ShapeBorder drawShape(String type){
       break;
     case 'radius':
       return RoundedRectangleBorder(
-        side:new BorderSide( // 保留原来的边框样式
+        side: BorderSide( // 保留原来的边框样式
           width: borderWidth,
           color: _color,
           style: BorderStyle.solid,

lib/widgets/elements/Form/Button/IconButton/demo.dart

@@ -75,7 +75,7 @@ class IconButtonCustom extends StatelessWidget {
         iconSize:(Random.secure().nextInt(20)+20).toDouble(), // 随机大小
         // 按钮内部,墨汁飞溅的颜色,点击按钮时的渐变背景色，当你不设置高亮背景时才会看的更清楚
         splashColor: _randomColor(),
-        padding: new EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
+        padding:  EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
         // 描述按下按钮时将发生的操作的文本
         tooltip:'这是${ type.codePoint }信息',
         // IconButton 的点击事件

lib/widgets/elements/Form/Button/IconButton/index.dart

@@ -66,7 +66,7 @@ class _DemoState extends State<Demo> {
 Widget allIconButtons(BuildContext context,_DemoState that){
   final ShapeBorder buttonShape = drawShape(that.buttonShapeType);
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -106,14 +106,14 @@ Widget allIconButtons(BuildContext context,_DemoState that){
 * 带align的text
 * */
 Widget textAlignBar(String txt){
-  //style: new TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
-  return new Align(
+  //style:  TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[
             SizedBox(height: 20.0),
             MarkdownBody(data: txt)
-            //new Text(txt, style: new TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
+            // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
           ])
   );
 }
@@ -137,7 +137,7 @@ ShapeBorder drawShape(String type){
       break;
     case 'radius':
       return RoundedRectangleBorder(
-        side:new BorderSide( // 保留原来的边框样式
+        side: BorderSide( // 保留原来的边框样式
           width: borderWidth,
           color: _color,
           style: BorderStyle.solid,

lib/widgets/elements/Form/Button/OutlineButton/demo.dart

@@ -79,7 +79,7 @@ class OutlineButtonCustom extends StatelessWidget {
         // 文本内容
         child: Text(txt, semanticsLabel: 'FLAT BUTTON 2'),
         // 边框的颜色,颜色也可以走主题色 Theme.of(context).primaryColor
-        borderSide:new BorderSide(color: _randomColor(),width:Random.secure().nextInt(10).toDouble()),
+        borderSide: BorderSide(color: _randomColor(),width:Random.secure().nextInt(10).toDouble()),
         // 按钮颜色
         color: _randomColor(),
         // 按钮失效时边框颜色
@@ -100,7 +100,7 @@ class OutlineButtonCustom extends StatelessWidget {
         splashColor: _randomColor(),
         // 抗锯齿能力,抗锯齿等级依次递增,none（默认),hardEdge,antiAliasWithSaveLayer,antiAlias
         clipBehavior: Clip.antiAlias,
-        padding: new EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
+        padding:  EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
         //高亮时候的阴影
         highlightElevation: 10.0,
         shape: shape, // 在Outline 里只能设置圆角,边框用borderSide

lib/widgets/elements/Form/Button/OutlineButton/index.dart

@@ -75,7 +75,7 @@ class _DemoState extends State<Demo> {
 Widget allOutlineButtons(BuildContext context,_DemoState that){
   final ShapeBorder buttonShape = drawShape(that.buttonShapeType);
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -136,16 +136,16 @@ Widget allOutlineButtons(BuildContext context,_DemoState that){
 //     context: context,
 //     builder: (BuildContext context) {
 //       return AlertDialog(
-//           title: new Text('提示'),
-//           content: new Text(name),
+//           title:  Text('提示'),
+//           content:  Text(name),
 //           actions: <Widget>[
-//             new FlatButton(
+//              FlatButton(
 //               // alert 的取消按钮
 //                 onPressed: () {
 //                   // 取消的事件
 //                   Navigator.of(context).pop(true);
 //                 },
-//                 child: new Text('取消'))
+//                 child:  Text('取消'))
 //           ]);
 //     }
 //   );
@@ -155,14 +155,14 @@ Widget allOutlineButtons(BuildContext context,_DemoState that){
 * 带align的text
 * */
 Widget textAlignBar(String txt){
-  //style: new TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
-  return new Align(
+  //style:  TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[
             SizedBox(height: 20.0),
             MarkdownBody(data: txt)
-            //new Text(txt, style: new TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
+            // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
           ])
   );
 }
@@ -186,7 +186,7 @@ ShapeBorder drawShape(String type){
       break;
     case 'radius':
       return RoundedRectangleBorder(
-        side:new BorderSide( // 保留原来的边框样式
+        side: BorderSide( // 保留原来的边框样式
           width: borderWidth,
           color: _color,
           style: BorderStyle.solid,

lib/widgets/elements/Form/Button/PopupMenuButton/demo.dart

@@ -71,8 +71,8 @@ class PopupMenuButtonDefault extends StatelessWidget {
         child: Text('点我试试'),
         onSelected: (String value) {},
         itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[
-              new PopupMenuItem(value: "选项一的内容", child: new Text("选项一")),
-              new PopupMenuItem(value: "选项二的内容", child: new Text("选项二"))
+               PopupMenuItem(value: "选项一的内容", child:  Text("选项一")),
+               PopupMenuItem(value: "选项二的内容", child:  Text("选项二"))
             ]);
   }
 
@@ -82,8 +82,8 @@ class PopupMenuButtonDefault extends StatelessWidget {
         icon: Icon(Icons.menu),
         onSelected: (String value) {},
         itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[
-              new PopupMenuItem(value: "选项一的内容", child: new Text("选项一")),
-              new PopupMenuItem(value: "选项二的内容", child: new Text("选项二"))
+               PopupMenuItem(value: "选项一的内容", child:  Text("选项一")),
+               PopupMenuItem(value: "选项二的内容", child:  Text("选项二"))
             ]);
   }
 }
@@ -116,10 +116,10 @@ class PopupMenuButtonCustom extends StatelessWidget {
         initialValue:selectStr,
         // 按下按钮时调用以创建要在菜单中显示的项目。
         itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[
-          new PopupMenuItem(value: "选项一的内容", child: new Text("选项一")),
-          new PopupMenuItem(value: "选项二的内容", child: new Text("选项二")),
-          new PopupMenuItem(value: "选项三的内容", child: new Text("选项三")),
-          new PopupMenuItem(value: "选项四的内容", child: new Text("选项四"))
+           PopupMenuItem(value: "选项一的内容", child:  Text("选项一")),
+           PopupMenuItem(value: "选项二的内容", child:  Text("选项二")),
+           PopupMenuItem(value: "选项三的内容", child:  Text("选项三")),
+           PopupMenuItem(value: "选项四的内容", child:  Text("选项四"))
         ],
         // 应用于弹出菜单按钮的偏移量(x,y)。
         offset:Offset(0.0,50.0),
@@ -134,7 +134,7 @@ class PopupMenuButtonCustom extends StatelessWidget {
           });
         },
         // 默认情况下匹配IconButton的8 dps填充。在某些情况下，特别是在此按钮作为列表项的尾随元素出现的情况下，能够将填充设置为零是有用的。
-        padding:new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0.0, right: 0.0),
+        padding: EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0.0, right: 0.0),
         //描述按下按钮时将发生的操作的文本。
         tooltip:'这是信息'
     );

lib/widgets/elements/Form/Button/PopupMenuButton/index.dart

@@ -64,7 +64,7 @@ class _DemoState extends State<Demo> {
 
 Widget allPopupMenuButton(Demo widget,State parent){
   return Container(
-      //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+      //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
       //mainAxisSize: MainAxisSize.max,
       children: <Widget>[

lib/widgets/elements/Form/Button/RaisedButton/demo.dart

@@ -105,10 +105,10 @@ class RaisedButtonCustom extends StatelessWidget {
         // 抗锯齿能力,抗锯齿等级依次递增,none（默认),hardEdge,antiAliasWithSaveLayer,antiAlias
         clipBehavior: Clip.antiAlias,
         padding:
-            new EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
+             EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
         shape: (shape is ShapeBorder)
             ? shape
-            : new Border.all(
+            :  Border.all(
                 // 设置边框样式
                 color: Colors.grey,
                 width: 2.0,

lib/widgets/elements/Form/Button/RaisedButton/index.dart

@@ -74,7 +74,7 @@ class _DemoState extends State<Demo> {
 Widget allRaisedButtons(BuildContext context,_DemoState that){
   final ShapeBorder buttonShape = drawShape(that.buttonShapeType);
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -135,16 +135,16 @@ Widget allRaisedButtons(BuildContext context,_DemoState that){
 //     context: context,
 //     builder: (BuildContext context) {
 //       return AlertDialog(
-//           title: new Text('提示'),
-//           content: new Text(name),
+//           title:  Text('提示'),
+//           content:  Text(name),
 //           actions: <Widget>[
-//             new FlatButton(
+//              FlatButton(
 //               // alert 的取消按钮
 //                 onPressed: () {
 //                   // 取消的事件
 //                   Navigator.of(context).pop(true);
 //                 },
-//                 child: new Text('取消'))
+//                 child:  Text('取消'))
 //           ]);
 //     }
 //   );
@@ -154,14 +154,14 @@ Widget allRaisedButtons(BuildContext context,_DemoState that){
 * 带align的text
 * */
 Widget textAlignBar(String txt){
-  //style: new TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
-  return new Align(
+  //style:  TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[
             SizedBox(height: 20.0),
             MarkdownBody(data: txt)
-            //new Text(txt, style: new TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
+            // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
           ])
   );
 }
@@ -185,7 +185,7 @@ ShapeBorder drawShape(String type){
       break;
     case 'radius':
       return RoundedRectangleBorder(
-        side:new BorderSide( // 保留原来的边框样式
+        side: BorderSide( // 保留原来的边框样式
           width: borderWidth,
           color: _color,
           style: BorderStyle.solid,

lib/widgets/elements/Form/Button/RawMaterialButton/demo.dart

@@ -62,7 +62,7 @@ class RawMaterialButtonCustom extends StatelessWidget {
         splashColor: _randomColor(),
         // 抗锯齿能力,抗锯齿等级依次递增,none（默认),hardEdge,antiAliasWithSaveLayer,antiAlias
         clipBehavior: Clip.antiAlias,
-        padding: new EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
+        padding:  EdgeInsets.only(bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
         //高亮时候的阴影
         highlightElevation: 10.0,
         // 按钮材质的形状

lib/widgets/elements/Form/Button/RawMaterialButton/index.dart

@@ -64,7 +64,7 @@ class _DemoState extends State<Demo> {
 Widget allRawMaterialButtons(BuildContext context,_DemoState that){
   final ShapeBorder buttonShape = drawShape(that.buttonShapeType);
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -108,16 +108,16 @@ Widget allRawMaterialButtons(BuildContext context,_DemoState that){
 //     context: context,
 //     builder: (BuildContext context) {
 //       return AlertDialog(
-//           title: new Text('提示'),
-//           content: new Text(name),
+//           title:  Text('提示'),
+//           content:  Text(name),
 //           actions: <Widget>[
-//             new FlatButton(
+//              FlatButton(
 //               // alert 的取消按钮
 //                 onPressed: () {
 //                   // 取消的事件
 //                   Navigator.of(context).pop(true);
 //                 },
-//                 child: new Text('取消'))
+//                 child:  Text('取消'))
 //           ]);
 //     }
 //   );
@@ -127,14 +127,14 @@ Widget allRawMaterialButtons(BuildContext context,_DemoState that){
 * 带align的text
 * */
 Widget textAlignBar(String txt){
-  //style: new TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
-  return new Align(
+  //style:  TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[
             SizedBox(height: 20.0),
             MarkdownBody(data: txt)
-            //new Text(txt, style: new TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
+            // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
           ])
   );
 }
@@ -158,7 +158,7 @@ ShapeBorder drawShape(String type){
       break;
     case 'radius':
       return RoundedRectangleBorder(
-        side:new BorderSide( // 保留原来的边框样式
+        side: BorderSide( // 保留原来的边框样式
           width: borderWidth,
           color: _color,
           style: BorderStyle.solid,

lib/widgets/elements/Form/CheckBox/Checkbox/index.dart

@@ -59,7 +59,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allCheckboxs(BuildContext context,_DemoState that){
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children: <Widget>[
@@ -97,13 +97,13 @@ Widget allCheckboxs(BuildContext context,_DemoState that){
 * 带align的text
 * */
 Widget textAlignBar(String txt){
-  return new Align(
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[
             SizedBox(height: 20.0),
             MarkdownBody(data: txt)
-            //new Text(txt, style: new TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
+            // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
           ])
   );
 }

lib/widgets/elements/Form/CheckBox/CheckboxListTile/demo.dart

@@ -34,7 +34,7 @@ class _CheckboxListTileStateDefault extends State {
     return Column(
       mainAxisAlignment: MainAxisAlignment.start,
       children: <Widget>[
-        new Center(
+         Center(
           child: CheckboxListTile(
             value: _value,
             selected:true,// 默认文字是否高亮
@@ -48,10 +48,10 @@ class _CheckboxListTileStateDefault extends State {
             activeColor: Colors.red, // 选中此复选框时要使用的颜色
           ),
         ),
-        new Center(
-          child: new CheckboxListTile(
+         Center(
+          child:  CheckboxListTile(
               value: isChecks[0],
-              title: new Text('选项1'),
+              title:  Text('选项1'),
               activeColor: _value ? Colors.red : Colors.green,
               controlAffinity: ListTileControlAffinity.platform,
               onChanged: (bool){
@@ -60,10 +60,10 @@ class _CheckboxListTileStateDefault extends State {
                 });
               }),
         ),
-        new Center(
-          child: new CheckboxListTile(
+         Center(
+          child:  CheckboxListTile(
               value: isChecks[1],
-              title: new Text('选项2'),
+              title:  Text('选项2'),
               activeColor: _value ? Colors.red : Colors.green,
               controlAffinity: ListTileControlAffinity.platform,
               onChanged: (bool){
@@ -72,10 +72,10 @@ class _CheckboxListTileStateDefault extends State {
                 });
               }),
         ),
-        new Center(
-          child: new CheckboxListTile(
+         Center(
+          child:  CheckboxListTile(
               value: isChecks[2],
-              title: new Text('选项3'),
+              title:  Text('选项3'),
               activeColor: _value ? Colors.red : Colors.green,
               controlAffinity: ListTileControlAffinity.platform,
               onChanged: (bool){
@@ -84,10 +84,10 @@ class _CheckboxListTileStateDefault extends State {
                 });
               }),
         ),
-        new Center(
-          child: new CheckboxListTile(
+         Center(
+          child:  CheckboxListTile(
               value: isChecks[3],
-              title: new Text('选项4'),
+              title:  Text('选项4'),
               activeColor: _value ? Colors.red : Colors.green,
               controlAffinity: ListTileControlAffinity.platform,
               onChanged: (bool){

lib/widgets/elements/Form/CheckBox/CheckboxListTile/index.dart

@@ -61,7 +61,7 @@ class _DemoState extends State<Demo> {
  */
 Widget allCheckboxs(BuildContext context, _DemoState that) {
   return Container(
-    //padding: new EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
+    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
       child: Column(
         //mainAxisSize: MainAxisSize.max,
           children:[
@@ -79,7 +79,7 @@ Widget allCheckboxs(BuildContext context, _DemoState that) {
 * 带align的text
 * */
 Widget textAlignBar(String txt) {
-  return new Align(
+  return  Align(
       alignment: FractionalOffset.centerLeft,
       child: Column(
           children: <Widget>[

lib/widgets/elements/Form/Input/TextField/text_field_demo.dart

@@ -4,7 +4,7 @@ import 'package:flutter/material.dart';
 class DefaultTextField extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return new Container(
+    return  Container(
       padding: const EdgeInsets.all(30.0),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start, //文本是起始端对齐
@@ -29,7 +29,7 @@ class CustomTextField extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new Container(
+    return  Container(
         padding: const EdgeInsets.all(30.0),
         child: TextField(
           keyboardType: TextInputType.number,

lib/widgets/elements/Form/Radio/Radio/demo.dart

@@ -22,27 +22,27 @@ class _Demo extends State<RadioADemo> {
   }
   Widget build(BuildContext context) {
     return  (
-      new Container(
+       Container(
         alignment: Alignment.centerLeft,
-        child: new Column(
+        child:  Column(
           crossAxisAlignment: CrossAxisAlignment.center,
           mainAxisSize: MainAxisSize.min,
           children: <Widget>[
-            new Radio(
+             Radio(
                 value: 1,
                 groupValue: groupValue,//当value和groupValue一致的时候则选中
                 onChanged: (T){
                   onChange(T);
                 }
             ),
-            new Radio(
+             Radio(
                 value: 2,
                 groupValue: groupValue,
                 onChanged: (T){
                   onChange(T);
                 }
             ),
-            new Radio(
+             Radio(
                 value: 3,
                 groupValue: groupValue,
                 onChanged: (T){

lib/widgets/elements/Form/Radio/Radio/index.dart

@@ -25,7 +25,7 @@ const content2 = """
 # 基本用法
 
 ```
-new Radio(
+ Radio(
     value: value,
     groupValue: groupValue, //当value和groupValue一致的时候则选中
     onChanged: (T){
@@ -45,7 +45,7 @@ class _DemoState extends State<Demo> {
     return WidgetDemo(
       contentList: [
         content1,
-        new RadioADemo(),
+         RadioADemo(),
         content2
       ],
       title: 'Radio',

lib/widgets/elements/Form/Radio/RadioListTile/demo.dart

@@ -24,7 +24,7 @@ class _Demo extends State<DemoA> {
   }
   Widget build(BuildContext context) {
 
-    return new Column(
+    return  Column(
       children: <Widget>[
         RadioListTile<String>(
           title: const Text('A'),

lib/widgets/elements/Form/Radio/RadioListTile/index.dart

@@ -45,7 +45,7 @@ class _DemoState extends State<Demo> {
     return WidgetDemo(
       contentList: [
         content1,
-        new DemoA(),
+         DemoA(),
         content2
       ],
       title: 'RadioListTile',

lib/widgets/elements/Form/Slider/Slider/demo.dart

@@ -16,7 +16,7 @@ class SliderDemo extends StatefulWidget {
 class _Demo extends State<SliderDemo> {
   double value = 0.0;
   Widget build(BuildContext context) {
-    return new Slider(
+    return  Slider(
       value: value,//实际进度的位置
       inactiveColor: Colors.black12,//进度中不活动部分的颜色
       label: 'value: $value',
@@ -43,8 +43,8 @@ class SliderThemeDemo extends StatefulWidget {
 class _SliderThemeDemo extends State<SliderThemeDemo> {
   double value = 0.0;
   Widget build(BuildContext context) {
-    return new Container(
-      child: new SliderTheme(
+    return  Container(
+      child:  SliderTheme(
         data: SliderTheme.of(context).copyWith(
 //                activeTickMarkColor:Colors.yellowAccent,
           activeTrackColor: Colors.yellowAccent,//实际进度的颜色
@@ -52,21 +52,21 @@ class _SliderThemeDemo extends State<SliderThemeDemo> {
           thumbColor: Colors.black,//滑块中心的颜色
           inactiveTrackColor:Colors.red,//默 认进度条的颜色
           valueIndicatorColor: Colors.blue,//提示进度的气派的背景色
-          valueIndicatorTextStyle: new TextStyle(//提示气泡里面文字的样式
+          valueIndicatorTextStyle:  TextStyle(//提示气泡里面文字的样式
             color: Colors.white,
           ),
           inactiveTickMarkColor:Colors.blue,//divisions对进度线分割后 断续线中间间隔的颜色
           overlayColor: Colors.pink,//滑块边缘颜色
         ),
-        child: new Container(
+        child:  Container(
           width: 340.0,
           margin: EdgeInsets.fromLTRB(0.0, 50.0, 0.0, 0.0),
-          child: new Row(
+          child:  Row(
             children: <Widget>[
-              new Text('0.0'),
-              new Expanded(
+               Text('0.0'),
+               Expanded(
                 flex: 1,
-                child: new Slider(
+                child:  Slider(
                   value: value,
                   label: '$value',
                   divisions: 10,
@@ -79,7 +79,7 @@ class _SliderThemeDemo extends State<SliderThemeDemo> {
                   max: 100.0,
                 ),
               ),
-              new Text('100.0'),
+               Text('100.0'),
             ],
           ),
         ),

lib/widgets/elements/Form/Slider/Slider/index.dart

@@ -49,19 +49,19 @@ const contentB = '''
 如果当前Slider样式 无法满足需求, 可以通过 ** SliderTheme ** 定制复杂样式
 
 ```
-new SliderTheme(
+ SliderTheme(
   data: SliderTheme.of(context).copyWith(
     activeTrackColor: Colors.yellowAccent,//实际进度的颜色
     inactiveTickMarkColor:Colors.black
     thumbColor: Colors.black,//滑块中心的颜色
     inactiveTrackColor:Colors.red,//默 认进度条的颜色
     valueIndicatorColor: Colors.blue,//提示进度的气派的背景色
-    valueIndicatorTextStyle: new TextStyle(//提示气泡里面文字的样式
+    valueIndicatorTextStyle:  TextStyle(//提示气泡里面文字的样式
       color: Colors.white,
     ),
     inactiveTickMarkColor:Colors.blue,//divisions对进度线分割后 断续线中间间隔的颜色
     overlayColor: Colors.pink,//滑块边缘颜色
-  child: new Slider()
+  child:  Slider()
 )
 
 ```

lib/widgets/elements/Form/Slider/SliderTheme/demo.dart

@@ -17,8 +17,8 @@ class SliderThemeDemo extends StatefulWidget {
 class _SliderThemeDemo extends State<SliderThemeDemo> {
   double value = 0.0;
   Widget build(BuildContext context) {
-    return new Container(
-      child: new SliderTheme(
+    return  Container(
+      child:  SliderTheme(
         data: SliderTheme.of(context).copyWith(
 //                activeTickMarkColor:Colors.yellowAccent,
           activeTrackColor: Colors.yellowAccent,//实际进度的颜色
@@ -26,21 +26,21 @@ class _SliderThemeDemo extends State<SliderThemeDemo> {
           thumbColor: Colors.black,//滑块中心的颜色
           inactiveTrackColor:Colors.red,//默 认进度条的颜色
           valueIndicatorColor: Colors.blue,//提示进度的气派的背景色
-          valueIndicatorTextStyle: new TextStyle(//提示气泡里面文字的样式
+          valueIndicatorTextStyle:  TextStyle(//提示气泡里面文字的样式
             color: Colors.white,
           ),
           inactiveTickMarkColor:Colors.blue,//divisions对进度线分割后 断续线中间间隔的颜色
           overlayColor: Colors.pink,//滑块边缘颜色
         ),
-        child: new Container(
+        child:  Container(
           width: 340.0,
           margin: EdgeInsets.fromLTRB(0.0, 50.0, 0.0, 0.0),
-          child: new Row(
+          child:  Row(
             children: <Widget>[
-              new Text('0.0'),
-              new Expanded(
+               Text('0.0'),
+               Expanded(
                 flex: 1,
-                child: new Slider(
+                child:  Slider(
                   value: value,
                   label: '$value',
                   divisions: 10,
@@ -53,7 +53,7 @@ class _SliderThemeDemo extends State<SliderThemeDemo> {
                   max: 100.0,
                 ),
               ),
-              new Text('100.0'),
+               Text('100.0'),
             ],
           ),
         ),

lib/widgets/elements/Form/Slider/SliderTheme/index.dart

@@ -24,7 +24,7 @@ const contentA = '''
 基本属性参考以下代码: 
 
 ```
-new SliderTheme(
+ SliderTheme(
   data: SliderThemeData({
     @required Color activeTrackColor,
     @required Color inactiveTrackColor,
@@ -67,7 +67,7 @@ class _Demo extends State<Demo> {
       codeUrl: 'elements/Form/Slider/SliderTheme/demo.dart',
       contentList: [
         contentA,
-        new SliderThemeDemo(),
+         SliderThemeDemo(),
       ],
       docUrl: 'https://docs.flutter.io/flutter/material/SliderTheme-class.html',
     );

lib/widgets/elements/Form/Slider/SliderThemeData/demo.dart

@@ -17,8 +17,8 @@ class SliderThemeDemo extends StatefulWidget {
 class _SliderThemeDemo extends State<SliderThemeDemo> {
   double value = 0.0;
   Widget build(BuildContext context) {
-    return new Container(
-      child: new SliderTheme(
+    return  Container(
+      child:  SliderTheme(
         data: SliderTheme.of(context).copyWith(
 //                activeTickMarkColor:Colors.yellowAccent,
           activeTrackColor: Colors.yellowAccent,//实际进度的颜色
@@ -26,21 +26,21 @@ class _SliderThemeDemo extends State<SliderThemeDemo> {
           thumbColor: Colors.black,//滑块中心的颜色
           inactiveTrackColor:Colors.red,//默 认进度条的颜色
           valueIndicatorColor: Colors.blue,//提示进度的气派的背景色
-          valueIndicatorTextStyle: new TextStyle(//提示气泡里面文字的样式
+          valueIndicatorTextStyle:  TextStyle(//提示气泡里面文字的样式
             color: Colors.white,
           ),
           inactiveTickMarkColor:Colors.blue,//divisions对进度线分割后 断续线中间间隔的颜色
           overlayColor: Colors.pink,//滑块边缘颜色
         ),
-        child: new Container(
+        child:  Container(
           width: 340.0,
           margin: EdgeInsets.fromLTRB(0.0, 50.0, 0.0, 0.0),
-          child: new Row(
+          child:  Row(
             children: <Widget>[
-              new Text('0.0'),
-              new Expanded(
+               Text('0.0'),
+               Expanded(
                 flex: 1,
-                child: new Slider(
+                child:  Slider(
                   value: value,
                   label: '$value',
                   divisions: 10,
@@ -53,7 +53,7 @@ class _SliderThemeDemo extends State<SliderThemeDemo> {
                   max: 100.0,
                 ),
               ),
-              new Text('100.0'),
+               Text('100.0'),
             ],
           ),
         ),

lib/widgets/elements/Form/Slider/SliderThemeData/index.dart

@@ -63,7 +63,7 @@ class _Demo extends State<Demo> {
       codeUrl: 'elements/Form/Slider/SliderThemeData/demo.dart',
       contentList: [
         contentA,
-        new SliderThemeDemo()
+         SliderThemeDemo()
       ],
       docUrl: 'https://docs.flutter.io/flutter/material/SliderThemeData-class.html',
     );

lib/widgets/elements/Form/Switch/AnimatedSwitcher/index.dart

@@ -39,7 +39,7 @@ class _Demo extends State<Demo> {
       codeUrl: 'elements/Form/Switch/AnimatedSwitcher/demo.dart',
       contentList: [
         contentA,
-        new AnimatedSwitcherDemo()
+         AnimatedSwitcherDemo()
       ],
       docUrl: '',
     );

lib/widgets/elements/Form/Switch/Switch/demo.dart

@@ -18,7 +18,7 @@ class SwitchDemo extends StatefulWidget {
 class _Demo extends State<SwitchDemo> {
   bool check = false;
   Widget build(BuildContext context) {
-    return new Switch(
+    return  Switch(
       value: this.check,
       onChanged: (bool val) {
         this.setState(() {
@@ -36,7 +36,7 @@ class SwitchHighDemo extends StatefulWidget {
 class _SwitchHighDemo extends State<SwitchHighDemo> {
   bool check = false;
   Widget build(BuildContext context) {
-    return new Switch.adaptive(
+    return  Switch.adaptive(
       value: this.check,
       activeColor: Colors.blue,     // 激活时原点颜色
       onChanged: (bool val) {
@@ -56,7 +56,7 @@ class SwitchTypesDemo extends StatefulWidget {
 class _SwitchTypesDemo extends State<SwitchTypesDemo> {
   bool check = false;
   Widget build(BuildContext context) {
-    return new Switch(
+    return  Switch(
       value: this.check,
       activeTrackColor:Colors.green,
       inactiveThumbColor: Colors.black,

lib/widgets/elements/Form/Switch/Switch/index.dart

@@ -19,7 +19,7 @@ const contentA = '''
 ### **基本用法**
 
 ```
-new Switch(
+ Switch(
     value: isChecked,
     activeColor: Colors.blue,     // 激活时原点颜色
     onChanged: (bool val) {

lib/widgets/elements/Form/Switch/SwitchListTile/demo.dart

@@ -18,7 +18,7 @@ class SwitchListTileDemo extends StatefulWidget {
 class _Demo extends State<SwitchListTileDemo> {
   bool _lights = false;
   Widget build(BuildContext context) {
-    return new SwitchListTile(
+    return  SwitchListTile(
       title: const Text('Lights'),
       value: _lights,
       onChanged: (bool value) { setState(() { _lights = value; }); },

lib/widgets/elements/Frame/Align/Align/demo.dart

@@ -18,13 +18,13 @@ class AlignAlignment extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new Container(
+    return  Container(
       color: Color(0xffd81b60),
       width: 90.0,
       height: 50.0,
-      child: new Align(
+      child:  Align(
         alignment: status,
-        child: new Text(
+        child:  Text(
           dec,
           style: TextStyle(fontSize: 12.0, color: Color(0xffffffff)),
         ),
@@ -45,10 +45,10 @@ class AlignFactor extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new Container(
-      margin: new EdgeInsets.only(top: 10.0, bottom: 10.0),
+    return  Container(
+      margin:  EdgeInsets.only(top: 10.0, bottom: 10.0),
       color: Color(0xffd81b60),
-      child: new Align(
+      child:  Align(
         alignment: status,
         widthFactor: wFactor,
         heightFactor: hFactor,

lib/widgets/elements/Frame/Align/Align/index.dart

@@ -40,10 +40,10 @@ class _DemoState extends State<Demo> {
   }
 
   Column _alignCreate() {
-    return new Column(
+    return  Column(
       children: <Widget>[
         SizedBox(height: 10.0),
-        new Row(
+         Row(
           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
           children: <Widget>[
             AlignAlignment(Alignment.center, 'center'),
@@ -51,7 +51,7 @@ class _DemoState extends State<Demo> {
           ],
         ),
         SizedBox(height: 10.0),
-        new Row(
+         Row(
           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
           children: <Widget>[
             AlignAlignment(Alignment.centerRight, 'centerRight'),
@@ -60,7 +60,7 @@ class _DemoState extends State<Demo> {
           ],
         ),
         SizedBox(height: 10.0),
-        new Row(
+         Row(
           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
           children: <Widget>[
             AlignAlignment(Alignment.topLeft, 'topLeft'),
@@ -71,11 +71,11 @@ class _DemoState extends State<Demo> {
         SizedBox(height: 10.0),
         MarkdownBody(data: _flatText1),
         Container(
-          margin: new EdgeInsets.only(top: 20.0, bottom: 20.0),
+          margin:  EdgeInsets.only(top: 20.0, bottom: 20.0),
           color: Color(0xffe91e63),
-          child: new Align(
+          child:  Align(
             alignment: Alignment.topLeft,
-            child: new Text(
+            child:  Text(
               "Align",
               style: TextStyle(color: Color(0xffffffff)),
             ),

lib/widgets/elements/Frame/Box/ConstrainedBox/demo.dart

@@ -29,12 +29,12 @@ class ConstrainedBoxCreate extends StatelessWidget {
             maxWidth: 300.0,
             maxHeight: 50.0,
           ),
-          child: new Container(
+          child:  Container(
             margin: const EdgeInsets.only(left: 20.0, right: 20.0),
             //child 宽高超过制定限制范围失效，效果宽/高=100/20区域
             width: currWidth,
             height: 250.0,
-            child: new Text(
+            child:  Text(
               describe,
               style: TextStyle(color: Colors.white),
             ),

lib/widgets/elements/Frame/Box/DecoratedBox/demo.dart

@@ -21,7 +21,7 @@ class DecoratedBoxCreate extends StatelessWidget {
       decoration: BoxDecoration(
         color: const Color(0xff7c94b6),
         //设置图片内容
-        image: new DecorationImage(
+        image:  DecorationImage(
             fit: BoxFit.cover,
             image: ExactAssetImage('assets/images/food01.jpeg')),
         //外宽边框，可以不设置
@@ -46,7 +46,7 @@ class DecoratedBoxCreateTwo extends StatelessWidget {
       decoration: BoxDecoration(
         color: const Color(0xff7c94b6),
         //设置图片内容
-        image: new DecorationImage(
+        image:  DecorationImage(
             fit: BoxFit.cover,
             image: ExactAssetImage('assets/images/food01.jpeg')),
         //根据传入的不同大小，呈现图片效弧度不同，
@@ -67,7 +67,7 @@ class DecoratedBoxCreateShape extends StatelessWidget {
       position: DecorationPosition.background,
       decoration: BoxDecoration(
         color: const Color(0xff7c94b6),
-        image: new DecorationImage(
+        image:  DecorationImage(
             fit: BoxFit.cover,
             image: ExactAssetImage('assets/images/food01.jpeg')),
         border: Border.all(

lib/widgets/elements/Frame/Box/DecoratedBox/index.dart

@@ -45,7 +45,7 @@ class _DemoState extends State<Demo> {
   }
 
   Column _decoratedBoxCreate() {
-    return new Column(
+    return  Column(
       children: <Widget>[
         Container(
           height: 100.0,

lib/widgets/elements/Frame/Box/Fittedbox/demo.dart

@@ -15,11 +15,11 @@ class FittedBoxDefault extends StatelessWidget {
   final BoxFit curfit;
   final String dec;
 
-  FittedBoxDefault({Key key,  this.curfit, this.dec});
+  FittedBoxDefault({Key key, this.curfit, this.dec});
 
   @override
   Widget build(BuildContext context) {
-    return new Column(
+    return  Column(
       children: <Widget>[
         Container(
           //外部有位置约束，内部大小设定失效，保持和外部约束一致

lib/widgets/elements/Frame/Box/Fittedbox/index.dart

@@ -1,4 +1,3 @@
-
 /**
  * Author: xiaojia.dxj
  * Date: 2019-01-08
@@ -9,7 +8,7 @@
  */
 import 'package:flutter/material.dart';
 import 'package:flutter_go/components/widget_demo.dart';
-import './demo.dart' as fittedBox;
+import './demo.dart';
 
 const String Text0 = """
 ### **FittedBox**
@@ -53,18 +52,16 @@ class _DemoState extends State<Demo> {
         Row(
           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
           children: <Widget>[
-            fittedBox.FittedBoxDefault(
-              /**
-               * 设置child写入布局期间分配空间
-               */
+            FittedBoxDefault(
+              //设置child写入布局期间分配空间
               curfit: BoxFit.contain,
               dec: 'contain',
             ),
-            fittedBox.FittedBoxDefault(
+            FittedBoxDefault(
               curfit: BoxFit.fill,
               dec: 'fill',
             ),
-            fittedBox.FittedBoxDefault(
+            FittedBoxDefault(
               curfit: BoxFit.cover,
               dec: 'cover',
             ),
@@ -76,11 +73,11 @@ class _DemoState extends State<Demo> {
         Row(
           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
           children: <Widget>[
-            fittedBox.FittedBoxDefault(
+            FittedBoxDefault(
               curfit: BoxFit.fitHeight,
               dec: 'fitHeight',
             ),
-            fittedBox.FittedBoxDefault(
+            FittedBoxDefault(
               curfit: BoxFit.fitWidth,
               dec: 'fitWidth',
             ),
@@ -92,11 +89,11 @@ class _DemoState extends State<Demo> {
         Row(
           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
           children: <Widget>[
-            fittedBox.FittedBoxDefault(
+            FittedBoxDefault(
               curfit: BoxFit.none,
               dec: 'none',
             ),
-            fittedBox.FittedBoxDefault(
+            FittedBoxDefault(
               curfit: BoxFit.scaleDown,
               dec: 'scaleDown',
             ),

lib/widgets/elements/Frame/Box/OverflowBox/demo.dart

@@ -10,11 +10,11 @@ class OverflowBoxDefault extends StatelessWidget {
 
   OverflowBoxDefault(
       {Key key,
-       this.curmaxHeight,
-       this.curmaxWidth,
-       this.curWidth,
-       this.curHeight,
-       this.curalignment})
+      this.curmaxHeight,
+      this.curmaxWidth,
+      this.curWidth,
+      this.curHeight,
+      this.curalignment})
       : super(key: key);
 
   @override
@@ -25,18 +25,18 @@ class OverflowBoxDefault extends StatelessWidget {
       //设置最大宽，高
       maxWidth: curmaxWidth,
       maxHeight: curmaxHeight,
-      /**
-       * 调整child位置
-       */
+
+      //调整child位置
       alignment: curalignment,
       child: Container(
-        /**
-         * widget宽高大于overflowBox设置的最大，以overflowbox设置的最大宽高为限制，
-         * 小于overflowBox  设置的最大限度，子widget能够完全显示
-         * * */
+        //widget宽高大于overflowBox设置的最大，以overflowbox设置的最大宽高为限制，
+        //小于overflowBox  设置的最大限度，子widget能够完全显示
         height: curHeight,
         width: curWidth,
-        child: Text("$curmaxWidth * $curmaxHeight",style: TextStyle(color: Colors.white),),
+        child: Text(
+          "$curmaxWidth * $curmaxHeight",
+          style: TextStyle(color: Colors.white),
+        ),
         color: Color(0xfff48fb1),
       ),
     );

lib/widgets/elements/Frame/Box/OverflowBox/index.dart

@@ -76,7 +76,10 @@ class _DemoState extends State<Demo> {
           ),
         ),
         SizedBox(height: 20),
-        SizedBox(height: 50,child: Text("宽高都大于最大限制"),),
+        SizedBox(
+          height: 50,
+          child: Text("宽高都大于最大限制"),
+        ),
         Container(
           width: 100.0,
           height: 100.0,
@@ -90,7 +93,6 @@ class _DemoState extends State<Demo> {
             curalignment: Alignment.center,
           ),
         ),
-
       ],
     );
   }

lib/widgets/elements/Frame/Box/RenderBox/demo.dart

@@ -1,22 +0,0 @@
-import 'package:flutter/material.dart';
-
-class RenderBoxDemo extends StatefulWidget {
-  _RenderBoxDemoState createState() => _RenderBoxDemoState();
-}
-
-class _RenderBoxDemoState extends State<RenderBoxDemo> {
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-        //  child: RenderFoo(),
-        );
-  }
-}
-
-class RenderFoo extends RenderBox {
-  @override
-  bool get hasSize => super.hasSize;
-
-  @override
-  BoxConstraints get constraints => super.constraints;
-}

lib/widgets/elements/Frame/Box/RenderBox/index.dart

@@ -1,62 +0,0 @@
-/*
- * @Author: xiaojia.dxj
- * @Date: 2019-01-08 15:56:26 
- * @Last Modified by:   xiaojia.dxj
- * @Last Modified time: 2019-01-08 15:56:26 
- */
-import 'package:flutter/material.dart';
-import 'package:flutter_go/components/widget_demo.dart';
-
-const String _Text = '''
-### **简介**
-> BoxConstraints为抽象类，我们可以使用BoxConstraints,一个不可边的约束布局，renderBox布局
-- 一个尺寸尊重一个BoxConstraints，当且仅当，以下关系式的成立：
-minWidth <= Size.width <= maxWidth
-minHeight <= Size.height <= maxHeight
-约束本身必须满足这些关系：
-
-0.0 <= minWidth <= maxWidth <= double.infinity
-0.0 <= minHeight <= maxHeight <= double.infinity
-double.infinity是每个约束的合法值。
-''';
-
-class Demo extends StatefulWidget {
-  static const String routeName = '/element/Frame/Box/RenderBox';
-
-  _DemoState createState() => _DemoState();
-}
-
-class _DemoState extends State<Demo> {
-  @override
-  Widget build(BuildContext context) {
-    return WidgetDemo(
-      title: 'Table',
-      codeUrl: 'elements/Frame/Box/RenderBox/demo.dart',
-      contentList: [
-        _Text,
-        _sizeBoxCreate(),
-      ],
-      docUrl: 'https://docs.flutter.io/flutter/widgets/RenderBox-class.html',
-    );
-  }
-
-  Column _sizeBoxCreate() {
-    return new Column(
-      children: <Widget>[
-        /**
-         * Immutable layout constraints for RenderBox layout.
-         */
-        SizedBox(
-          width: 900.0,
-          height: 50.0,
-          child: const Card(
-              child: Text(
-                'SizedBox',
-                textAlign: TextAlign.center,
-              ),
-              color: Color(0xFFEF5350)),
-        ),
-      ],
-    );
-  }
-}

lib/widgets/elements/Frame/Box/SizeBox/index.dart

@@ -28,15 +28,15 @@ class _DemoState extends State<Demo> {
   }
 
   Column _sizeBoxCreate() {
-    return new Column(
+    return  Column(
       children: <Widget>[
-        new Text("SizedBox",
+         Text("SizedBox",
             textAlign: TextAlign.right,
             style: TextStyle(
               fontSize: 28.0,
               fontWeight: FontWeight.bold,
             )),
-        new Row(
+         Row(
           children: <Widget>[
             sizeBox.SizeBoxDefault(),
             SizedBox(

lib/widgets/elements/Frame/Box/SizedOverflowBox/demo.dart

@@ -7,10 +7,7 @@ class SizeOverflowBoxDefault extends StatelessWidget {
   final String text;
 
   SizeOverflowBoxDefault(
-      {Key key,
-       this.curSizeWidth,
-       this.curSizeHeight,
-       this.text})
+      {Key key, this.curSizeWidth, this.curSizeHeight, this.text})
       : super(key: key);
 
   @override
@@ -23,7 +20,7 @@ class SizeOverflowBoxDefault extends StatelessWidget {
         color: Color(0xfff06292),
         width: 50.0,
         height: 50.0,
-        child: new Text(
+        child:  Text(
           text,
           style: TextStyle(color: Colors.white),
         ),
@@ -36,8 +33,7 @@ class SizeBoxDefault extends StatelessWidget {
   final double curWidth;
   final double curHeight;
 
-  SizeBoxDefault({Key key,  this.curHeight,  this.curWidth})
-      : super(key: key);
+  SizeBoxDefault({Key key, this.curHeight, this.curWidth}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/widgets/elements/Frame/Box/SizedOverflowBox/index.dart

@@ -6,7 +6,7 @@
  */
 import 'package:flutter/material.dart';
 import 'package:flutter_go/components/widget_demo.dart';
-import './demo.dart' as sizeBox;
+import './demo.dart';
 
 // const String _Text = """### **SizeBox简介**
 // > 常用的一个控件，设置具体尺寸。
@@ -53,47 +53,47 @@ class _DemoState extends State<Demo> {
   }
 
   Column _sizedOverflowBoxCreate() {
-    return new Column(
+    return  Column(
       children: <Widget>[
-        sizeBox.SizeBoxDefault(
+        SizeBoxDefault(
           curWidth: 200.0,
           curHeight: 50.0,
         ),
         SizedBox(height: 20.0),
         Container(
-          margin: new EdgeInsets.only(top: 10.0),
+          margin:  EdgeInsets.only(top: 10.0),
           color: Color(0xffd81b60),
           width: 200.0,
           height: 50.0,
         ),
         Container(
-          margin: new EdgeInsets.only(top: 10.0),
+          margin:  EdgeInsets.only(top: 10.0),
           color: Color(0xffd81b60),
           alignment: Alignment.topCenter,
           width: 200.0,
           height: 50.0,
-          child: sizeBox.SizeOverflowBoxDefault(
+          child: SizeOverflowBoxDefault(
             text: "SizeBox",
           ),
         ),
         Container(
-          margin: new EdgeInsets.only(top: 10.0),
+          margin:  EdgeInsets.only(top: 10.0),
           color: Color(0xffd81b60),
           width: 200.0,
           height: 50.0,
-          child: sizeBox.SizeOverflowBoxDefault(
+          child: SizeOverflowBoxDefault(
             text: "box",
             curSizeWidth: 100.0,
             curSizeHeight: 20.0,
           ),
         ),
         Container(
-          margin: new EdgeInsets.only(top: 10.0),
+          margin:  EdgeInsets.only(top: 10.0),
           color: Color(0xffd81b60),
           width: 200.0,
           height: 50.0,
           alignment: Alignment.center,
-          child: sizeBox.SizeOverflowBoxDefault(
+          child: SizeOverflowBoxDefault(
             text: "box",
             curSizeWidth: 100.0,
             curSizeHeight: 20.0,

lib/widgets/elements/Frame/Box/TextBox/demo.dart

@@ -1 +0,0 @@
-

lib/widgets/elements/Frame/Box/TextBox/index.dart

@@ -1,49 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:flutter_go/components/widget_demo.dart';
-
-const String _Text = """### **TextBox简介**
-> 是一个包含一段文本的矩形
-- 它与rect类似，不过包含一个固定的TextDirection。
-- sizebox的width，heigh为null，child自身设置
-### **属性**
-> width：宽
-> height：高
-- ex:200*50 sizebox
-""";
-
-class Demo extends StatefulWidget {
-  static const String routeName = '/element/Frame/Box/TextBox';
-
-  _DemoState createState() => _DemoState();
-}
-
-class _DemoState extends State<Demo> {
-  @override
-  Widget build(BuildContext context) {
-    return WidgetDemo(
-      title: 'TextBox',
-      codeUrl: 'elements/Frame/Box/TextBox/demo.dart',
-      contentList: [
-        _Text,
-        _creatTexbox(),
-      ],
-      docUrl: 'https://docs.flutter.io/flutter/dart-ui/TextBox-class.html',
-    );
-  }
-}
-
-Column _creatTexbox() {
-  return Column(
-    children: <Widget>[
-      // Text("TextBox ",textDirection:  new TextBox.fo,),
-      Container(
-        // child:  TextBox.fromLTRB(270.0, 180.0, 1360.0, 730.0,TextDirection.rtl),
-
-      )
-    
-//  centerSlice: new Rect.fromLTRB(270.0, 180.0, 1360.0, 730.0),
-
-    
-    ],
-  );
-}

lib/widgets/elements/Frame/Box/UnconstrainedBox/demo.dart

@@ -6,7 +6,7 @@ class UnconstrainedBoxDemo extends StatelessWidget {
     return UnconstrainedBox(
       constrainedAxis: Axis.vertical,
       textDirection: TextDirection.rtl,
-      child: new Row(
+      child:  Row(
         children: <Widget>[
           Container(
             width: 100.0,

lib/widgets/elements/Frame/Box/index.dart

@@ -5,7 +5,6 @@ import 'ConstrainedBox/index.dart' as ConstrainedBox;
 import 'DecoratedBox/index.dart' as DecoratedBox;
 import 'SizeBox/index.dart' as SizeBox;
 import 'SizedOverflowBox/index.dart' as SizedOverflowBox;
-import 'TextBox/index.dart' as TextBox;
 import 'UnconstrainedBox/index.dart' as UnconstrainedBox;
 import 'OverflowBox/index.dart' as OverflowBox;
 import 'FittedBox/index.dart' as FittedBox;
@@ -33,11 +32,6 @@ List<WidgetPoint> widgetPoints = [
     routerName: SizedOverflowBox.Demo.routeName,
     buildRouter: (BuildContext context) => SizedOverflowBox.Demo(),
   ),
-  WidgetPoint(
-    name: 'TextBox',
-    routerName: TextBox.Demo.routeName,
-    buildRouter: (BuildContext context) => TextBox.Demo(),
-  ),
   WidgetPoint(
     name: 'UnconstrainedBox',
     routerName: UnconstrainedBox.Demo.routeName,

lib/widgets/elements/Frame/Expanded/Expanded/expanded_demo.dart

@@ -14,57 +14,57 @@ class ExpandedDemo extends StatelessWidget {
     return Column(
       children: <Widget>[
         Text('Expanded'),
-        new Row(children: <Widget>[
-          new RaisedButton(
+         Row(children: <Widget>[
+           RaisedButton(
             onPressed: () {
               print('点击红色按钮事件');
             },
             color: const Color(0xffcc0000),
-            child: new Text('红色按钮',style: txtColor,),
+            child:  Text('红色按钮',style: txtColor,),
           ),
-          new Expanded(
+           Expanded(
             flex: 1,//flex用来设置当前可用空间的占优比
-            child: new RaisedButton(
+            child:  RaisedButton(
               onPressed: () {
                 print('点击黄色按钮事件');
               },
               color: const Color(0xfff1c232),
-              child: new Text('黄色按钮',style: txtColor,),
+              child:  Text('黄色按钮',style: txtColor,),
             ),
           ),
-          new RaisedButton(
+           RaisedButton(
             onPressed: () {
               print('点击粉色按钮事件');
             },
             color: const Color(0xffea9999),
-            child: new Text('粉色按钮',style: txtColor,),
+            child:  Text('粉色按钮',style: txtColor,),
           ),
         ]),
         Text('Flexible'),
-        new Row(children: <Widget>[
-          new RaisedButton(
+         Row(children: <Widget>[
+           RaisedButton(
             onPressed: () {
               print('点击红色按钮事件');
             },
             color: const Color(0xffcc0000),
-            child: new Text('红色按钮',style: txtColor,),
+            child:  Text('红色按钮',style: txtColor,),
           ),
-          new Flexible(
+           Flexible(
             flex: 1,
-            child: new RaisedButton(
+            child:  RaisedButton(
               onPressed: () {
                 print('点击黄色按钮事件');
               },
               color: const Color(0xfff1c232),
-              child: new Text('黄色按钮',style: txtColor,),
+              child:  Text('黄色按钮',style: txtColor,),
             ),
           ),
-          new RaisedButton(
+           RaisedButton(
             onPressed: () {
               print('点击粉色按钮事件');
             },
             color: const Color(0xffea9999),
-            child: new Text('粉色按钮',style: txtColor,),
+            child:  Text('粉色按钮',style: txtColor,),
           ),
         ]),
       ],