[shutter] shutter layout component (physicalmodel component)

One 、PhysicalModel Components

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PhysicalModel Components : The layout can be displayed in different shapes ,

class PhysicalModel extends SingleChildRenderObjectWidget { 
      const PhysicalModel({ 
        Key key,    this.shape = BoxShape.rectangle, //  shape  :  circular  ,  rectangular      this.clipBehavior = Clip.none, //  Tailoring behavior     this.borderRadius,	//  radius      this.elevation = 0.0,    @required this.color, //  Color value      this.shadowColor = const Color(0xFF000000), //  The background color     Widget child, //  Reduced components   }) : assert(shape != null),       assert(elevation != null && elevation >= 0.0),       assert(color != null),       assert(shadowColor != null),       assert(clipBehavior != null),       super(key: key, child: child);}

PhysicalModel Component usage :

• Set crop shape : Default rectangle , Can be in shape Field set circle ;
• Set the background color : color Field to set the background color , Color type ;
• Set the fillet radius : borderRadius Field settings , BorderRadius type ;
• Set crop behavior : clipBehavior Field set crop behavior , Clip Enumeration type , nothing / serrate / Anti-Aliasing / Anti-Aliasing + Save layers ;
• Set the trimmed components : child Field settings are pruned components , Widget type ;

PhysicalModel(  color:  The background color  ( Color  type  ),    //  Set the fillet radius  15  borderRadius:  radius  ( BorderRadius  type  ),    //  Set crop behavior  ,  Anti-Aliasing   clipBehavior: Clip  Enumeration type  (  nothing / serrate / Anti-Aliasing / Anti-Aliasing + Save layers  ),    //  Set the trimmed components    child:  Trimmed components  ( Widget  type  ),)

Code example : PhysicalModel Component clipping PageView Components , take PageView Cut the component into rounded rectangle style ;

PhysicalModel(  color: Colors.transparent,  //  Set the fillet radius  15  borderRadius: BorderRadius.circular(50),  //  Set crop behavior  ,  Anti-Aliasing   clipBehavior: Clip.antiAlias,  //  Set up  PageView  Components   child:  PageView(    //  Set up  PageView  Several components encapsulated in     children: <Widget>[      //  The first page component       Container(        //  Set the center mode  ,  centered         alignment:Alignment.center,        //  Decorator settings  ,  Green background         decoration: BoxDecoration(color: Colors.green),        //  Main text displayed         child: Text(" page  0", style: TextStyle(fontSize: 20, color: Colors.black),),      ),      //  The second page component       Container(        //  Set the center mode  ,  centered         alignment:Alignment.center,        //  Decorator settings  ,  Green background         decoration: BoxDecoration(color: Colors.red),        //  Main text displayed         child: Text(" page  1", style: TextStyle(fontSize: 20, color: Colors.white),),      ),      //  The third page component       Container(        //  Set the center mode  ,  centered         alignment:Alignment.center,        //  Decorator settings  ,  Green background         decoration: BoxDecoration(color: Colors.black),        //  Main text displayed         child: Text(" page  2", style: TextStyle(fontSize: 20, color: Colors.yellow),),      ),    ],  ),),

Two 、 Complete code example

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Complete code example :

import 'package:flutter/material.dart';class LayoutPage extends StatefulWidget { 
      @override  _LayoutPageState createState() => _LayoutPageState();}class _LayoutPageState extends State<LayoutPage> { 
      ///  The currently selected bottom navigation bar index   int _currentSelectedIndex = 0;  // This widget is the root of your application.  @override  Widget build(BuildContext context) { 
        //  Text component style  ,  Can be set to  Text  Text component     //  Set font size  20,  The color is red     TextStyle textStyle = TextStyle(fontSize: 20, color: Colors.red);    return MaterialApp(      title: ' Example layout components ',      theme: ThemeData(        primarySwatch: Colors.blue,      ),      home: Scaffold(        //  Top title bar         appBar: AppBar(title: Text(' Example layout components '),),        //  Bottom navigation bar  BottomNavigationBar  Set up         // items  You can set multiple  BottomNavigationBarItem        bottomNavigationBar: BottomNavigationBar(          //  Set the currently selected bottom navigation index           currentIndex: _currentSelectedIndex,          //  Set the callback event of clicking the navigation bar at the bottom  , index  The parameter is the index value of the click           onTap: (index){ 
                //  Callback  StatefulWidget  Component's  setState  Method of setting state  ,  Modify the currently selected index             //  after  BottomNavigationBar  The component will automatically update the currently selected tab             setState(() { 
                  //  change  int _currentSelectedIndex  The state of the variable               _currentSelectedIndex = index;            });          },          //  entry           items: [          //  Set the bottom navigation bar entry ,  Each entry can be set with an icon           BottomNavigationBarItem(            //  The default icon             icon: Icon(Icons.home, color: Colors.grey,),            //  Icon in active state             activeIcon: Icon(Icons.home, color: Colors.red,),            //  Set title             title: Text(" Home page ")          ),          //  Set the bottom navigation bar entry ,  Each entry can be set with an icon           BottomNavigationBarItem(            //  The default icon             icon: Icon(Icons.settings, color: Colors.grey,),            //  Icon in active state             activeIcon: Icon(Icons.settings, color: Colors.red,),              //  Set title               title: Text(" Set up ")          )        ],),        //  Set the levitation button         floatingActionButton: FloatingActionButton(          onPressed: (){ 
                print(" Click the hover button ");          },          child: Text(" Levitation button assembly "),        ),        // Container  Container usage         body:        _currentSelectedIndex == 0 ?        //  Refresh indicator component         RefreshIndicator(          //  Display content           child: ListView(            children: <Widget>[              Container( //  Corresponding to the bottom navigation bar settings tab                 //  Set the decorator of the container  , BoxDecoration  Is the most commonly used decorator                 //  You can check it by yourself  BoxDecoration  Properties that can be set in                 decoration: BoxDecoration(color: Colors.white),                //  Set up  child  How the sub components are centered ,  Center                 alignment: Alignment.center,                //  Child components ,  The subcomponent is set to a  Column  Components                 child: Column(                  // Column  Child components ,  Set up here  Text  Text component                   children: <Widget>[                    Text(" Main page tab ,  The drop-down refresh "),                    //  A linear layout arranged horizontally                     Row(                      children: <Widget>[                        //  Original picture ,  For comparison                         Image.network("https://img-blog.csdnimg.cn/20210301145757946.png",                          width: 100,                          height: 100,                        ),                        //  Circular clipping component  ,  take  child  Cut the layout into a circle                         ClipOval(                          //  Use  SizedBox  Component constrains layout size                           child: SizedBox(                            width: 100,                            height: 100,                            //  Use  SizedBox  Constrain this  Image  Component size                             child: Image.network("https://img-blog.csdnimg.cn/20210301145757946.png"),                          ),                        ),                        Padding(                          //  Set the inside margin  5                          padding: EdgeInsets.all(15),                          //  Square cutting component  ,  Cut the components into squares                           child: ClipRRect(                            //  Set the clipping fillet ,  Set the radius of the four corners to  10  Fillet of                             borderRadius: BorderRadius.all(Radius.circular(10)),                            //  Modify the transparency component  ,  Set up here  50%  transparency                             child: Opacity(                                opacity: 0.5,                                //  Set up  100x100  Size picture component                                 child: Image.network("https://img-blog.csdnimg.cn/20210301145757946.png",                                  width: 100,                                  height: 100,                                ),                            ),                          ),                        ),                      ],                    ),                                        //  Set up a layout container  ,  For encapsulation  PageView  Components                     Container(                      //  Set height                       height: 200,                      //  Set margins                       margin: EdgeInsets.all(15),                      //  Set decoration ,  Dark orange background                       decoration: BoxDecoration(                          color: Colors.white                      ),                      //  Set up subcomponents  PageView  Cutting components for                       child:                      PhysicalModel(color: Colors.transparent,                        //  Set the fillet radius  15                        borderRadius: BorderRadius.circular(50),                        //  Set crop behavior  ,  Anti-Aliasing                         clipBehavior: Clip.antiAlias,                        //  Set up  PageView  Components                         child:                        PageView(                          //  Set up  PageView  Several components encapsulated in                           children: <Widget>[                            //  The first page component                             Container(                              //  Set the center mode  ,  centered                               alignment:Alignment.center,                              //  Decorator settings  ,  Green background                               decoration: BoxDecoration(color: Colors.green),                              //  Main text displayed                               child: Text(" page  0", style: TextStyle(fontSize: 20, color: Colors.black),),                            ),                            //  The second page component                             Container(                              //  Set the center mode  ,  centered                               alignment:Alignment.center,                              //  Decorator settings  ,  Green background                               decoration: BoxDecoration(color: Colors.red),                              //  Main text displayed                               child: Text(" page  1", style: TextStyle(fontSize: 20, color: Colors.white),),                            ),                            //  The third page component                             Container(                              //  Set the center mode  ,  centered                               alignment:Alignment.center,                              //  Decorator settings  ,  Green background                               decoration: BoxDecoration(color: Colors.black),                              //  Main text displayed                               child: Text(" page  2", style: TextStyle(fontSize: 20, color: Colors.yellow),),                            ),                          ],                        ),                      ),                    ),                  ],                ),              ),            ],          ),          //  Method of callback during refresh           //  When a drop-down operation occurs in the list ,  Call back the method           //  The callback is  Future  Type of           onRefresh: _refreshIndicatorOnRefresh,        )        :        Container( //  Corresponding to the bottom navigation bar settings tab           //  Set the decorator of the container  , BoxDecoration  Is the most commonly used decorator           //  You can check it by yourself  BoxDecoration  Properties that can be set in           decoration: BoxDecoration(color: Colors.white),          //  Set up  child  How the sub components are centered ,  Center           alignment: Alignment.center,          //  Child components ,  The subcomponent is set to a  Column  Components           child: Column(            // Column  Child components ,  Set up here  Text  Text component             children: <Widget>[              Text(" Set up page tabs ")            ],          ),        ) , //  This setting is related to  _currentSelectedIndex == 0?  Corresponding , ?:  Ternary operator       ),    );  }  /// RefreshIndicator  When a pull-down operation occurs ,  Call back the method   ///  This is an asynchronous method  ,  Add... Before the method body  async  keyword   Future<Null> _refreshIndicatorOnRefresh() async{ 
        //  Pause  500 ms ,  Use  await  Keyword implementation     //  Here  500 ms  Between  ,  The list is in refresh state     // 500 ms  after  ,  The list becomes non refreshed     await Future.delayed(Duration(milliseconds: 500));    return null;  }}

Operation effect display :

3、 ... and 、 Related resources

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Reference material :

• Flutter Official website : https://flutter.dev/
• Flutter Developing documents : https://flutter.cn/docs ( Strongly recommend )
• official GitHub Address : https://github.com/flutter
• Flutter The Chinese community : https://flutter.cn/
• Flutter Practical tutorial : https://flutter.cn/docs/cookbook
• Flutter CodeLab : https://codelabs.flutter-io.cn/
• Dart Chinese document : https://dart.cn/
• Dart Developer website : https://api.dart.dev/
• Flutter Chinese net ( unofficial , The translation is very good ) : https://flutterchina.club/ , http://flutter.axuer.com/docs/
• Flutter Related issues : https://flutterchina.club/faq/ ( It is recommended to watch it at the introductory stage )

Blog source download :

• GitHub Address : https://github.com/han1202012/flutter_cmd ( Keep updating with the progress of the blog , There may not be the source code of this blog )

• Blog source snapshot : https://download.csdn.net/download/han1202012/15484718 ( The source code snapshot of this blog , You can find the source code of this blog )