Question

如果您可以在顶部看到，我创建了4列，其中包含一个包含图像和文本的“平面”按钮。我想给Flat按钮准确的宽度和高度是可能的吗？另外，我想给出一个水平滚动，以便我可以在同一行中添加更多列。此外，单击图像，相应的列表应如下所示。这是我现在的代码。

     import 'package:flutter/material.dart';
     import 'widgets.dart';

    void main() => runApp(new MaterialApp(
        title: 'Booze Up',
      theme: new ThemeData(
  primarySwatch: Colors.red,
),
home: new MyHomePage('Booze Up'),
routes: <String,WidgetBuilder>{
  "/MyHomePage2": (BuildContext context) => new MyHome()
}
));

       class MyHomePage extends StatelessWidget {

    int counter =0;
    String title;
    MyHomePage(this.title);

     @override
     Widget build(BuildContext context) {


        Text text = new Text("dev");
       Text text2 = new Text("Sneha");
       Text text3 = new Text("Prashant");

var pad = const EdgeInsets.all(10.0);

Padding pad1 = new Padding(child: text, padding:pad);
 Padding pad2 = new Padding(child: text2, padding:pad);
  Padding pad3 = new Padding(child: text3, padding:pad);

     ListView listView = new ListView(children: <Widget>[new 
     Image.asset('images/party.jpg'),pad1,pad2,pad3]);

  Drawer drawer = new Drawer(child:listView); 

// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return new Scaffold(
  drawer: drawer,
  appBar: new AppBar(
    // Here we take the value from the MyHomePage object that was created by
    // the App.build method, and use it to set our appbar title.
    title: new Text(title),
  ),
  body:
  new Center(

    // Center is a layout widget. It takes a single child and positions it
    // in the middle of the parent.
    child: new Column(
             mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        new Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
              new Icon(Icons.camera),
              new Padding(padding: new EdgeInsets.fromLTRB(0.0,0.0, 5.0,0.0)),
            new RaisedButton(
            color: Colors.black,
          child: 
          new Text(  'Party Home',
          style: new TextStyle(fontSize: 20.0,fontStyle: 
               FontStyle.italic,color: Colors.white),
                   ),
          onPressed: () {
                  Navigator.of(context).pushNamed("/MyHomePage2");
          },                
       )]),
       new Row(
         mainAxisAlignment: MainAxisAlignment.center,
         children: <Widget>[
         new Icon(Icons.favorite),
        new Padding(padding: new EdgeInsets.fromLTRB(0.0,0.0, 5.0,0.0)),
        new Text(
          'Pub Hopping',
         style: new TextStyle(fontSize: 20.0,fontStyle: FontStyle.italic),

        ),
         ]),
        new Image.asset('images/party.jpg'),   
          ],
        )
        , 
    ),

  floatingActionButton: new FloatingActionButton(
    onPressed: null,
    child: new Icon(Icons.add),
  ), // This trailing comma makes auto-formatting nicer for build methods.
);
   }


  }

        class MyHome extends StatefulWidget
        {
         @override
        State<StatefulWidget> createState() => new MyHomePage2();
         }

        class MyHomePage2 extends State<MyHome> {
        List items = new List() ;


        @override
        Widget build(BuildContext context) {

var abc = MediaQuery.of(context).size;

print(abc.width);

var width = abc.width/4;

         Text text = new Text("Dev");
        Text text2 = new Text("Sneha");
        Text text3 = new Text("Prashant");
      Text text4 = new Text("Vikesh");

var pad = const EdgeInsets.all(10.0);

Padding pad1 = new Padding(child: text, padding:pad);
 Padding pad2 = new Padding(child: text2, padding:pad);
  Padding pad3 = new Padding(child: text3, padding:pad);
  Padding pad4 = new Padding(child: text4, padding:pad);

      ListView listView = new ListView(children: <Widget>[new 
      Image.asset('images/party.jpg'),pad1,pad2,pad3,pad4]);


     ListView listView2 = new ListView(children: <Widget>[new Text("Jacob 
        Creek"),new Text("Sula red"),new Text("Yellow tale"),new 
        Text("Chenin Blanc")]);

        Drawer drawer = new Drawer(child: listView);

return new Scaffold(
  drawer: drawer,

  appBar: new AppBar(
    title: new Text('Booze Up'),
  ),
  body:
     new Column(
      children: <Widget>[
        new Row(
           children: <Widget>[
                 new Column(
          children: <Widget>[
                  new FlatButton(child: new 
         Image.asset('images/party.jpg',width:width,height: 
          width),onPressed: buildlist('button1'),),
          new Text('Juice', style: new TextStyle(fontSize: 20.0,fontStyle: 
          FontStyle.italic)),        
          ]),
                new Column(
          children: <Widget>[
        new FlatButton(child: new 
       Image.asset('images/party.jpg',width:width,height: width),onPressed: 
        buildlist('button2')),
          new Text('Cocktail', style: new TextStyle(fontSize: 
         20.0,fontStyle: FontStyle.italic)) ,                     
          ]),
                  new Column(
          children: <Widget>[
      new FlatButton(child: new Image.asset('images/party.jpg',width:width,height: width),onPressed: buildlist('button3')),
          new Text('Moocktail', style: new TextStyle(fontSize: 20.0,fontStyle: FontStyle.italic)),
          ]),
                  new Column(
          children: <Widget>[
     new FlatButton(child: new Image.asset('images/party.jpg',width:width,height: width),onPressed: buildlist('button4')),
          new Text('Juice', style: new TextStyle(fontSize: 20.0,fontStyle: FontStyle.italic)),
          ])
           ]),
        new Expanded(
          child: new ListView(
            padding: new EdgeInsets.fromLTRB(10.0, 10.0, 0.0,10.0),
            children: items,
          ),
        )]
     ),
  floatingActionButton: new FloatingActionButton(
    onPressed: null,
    child: new Icon(Icons.add),
  ), // This trailing comma makes auto-formatting nicer for build methods.
);
            }

buildlist(String s ) {

    print("entered buildlist"+ s);

  List refresh = new List();
  if(s=='button1')
  {
  refresh = [
   new Refreshments("Watermelon",250),
    new Refreshments("Orange",275),
    new Refreshments("Pine",300),
    new Refreshments("Papaya",225),
     new Refreshments("Apple",250),
];
  }
  else if(s=='button2')

    { refresh = [
      new Refreshments("Pina Colada",250),
      new Refreshments("Bloody Mary",275),
      new Refreshments("Long Island Ice tea",300),
      new Refreshments("Screwdriver",225),
      new Refreshments("Fusion Cocktail",250),
];
    }
    else if(s=='button3')
    {
    refresh  = [
       new Refreshments("Virgin Pina Colada",250),
      new Refreshments("Virgin Mary",275),
       new Refreshments("Strawberry Flush",300),
      new Refreshments("Mango Diver",225),
      new Refreshments("Peach Delight",250),
];
    }
    else{
 refresh = [
       new Refreshments("Absolute",250),
       new Refreshments("Smirnoff",275),
        new Refreshments("White Mischief",300),
        new Refreshments("Romanov",225),
        new Refreshments("Blender's Pride",250),
];
    }


 for(var item in refresh)
 {
   items.add(new ItemsList(item));
 }

  }


                 }

       class  Refreshments 
 {
        String name;
          int price;

           Refreshments(this.name,this.price);
 }


            class ItemsList extends StatelessWidget
      {
            final Refreshments refreshments;

           ItemsList (this.refreshments);

      @override
        Widget build(BuildContext context) {
     return new ListTile(
      onTap: null,
      title: new Text(refreshments.name),
  );

         }
        }

Answer 1

要获得准确的width和height，请使用Container作为FlatButton的父级，它会为您提供这些属性。 * Darky指出使用SizedBox是更好的解决方案。
使用ListView并指定scrollDirection: Axis.horizontal以启用水平滚动。
使用ListView.builder可以循环遍历子窗口小部件列表，这样您就可以通过简单地读取列表中窗口小部件的索引来实现与之交互的窗口小部件。 / p>

示例

import "package:flutter/material.dart"; class LetsParty extends StatefulWidget { @override _LetsPartyState createState() => new _LetsPartyState(); } class _LetsPartyState extends State<LetsParty> { Image _partyImage = new Image.network( "http://www.freshcardsgifts.co.uk/images/_lib/animal-party-greetings-card-3003237-0-1344698261000.jpg"); final GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>(); @override Widget build(BuildContext context) { return new Scaffold( key: scaffoldKey, appBar: new AppBar(title: new Text("Let's Party"),), body: new ListView.builder( scrollDirection: Axis.horizontal, itemCount: 10, //add the length of your list here itemBuilder: (BuildContext context, int index) { return new Column( children: <Widget>[ ///Flexible let's your widget flex in the given space, dealing with the overflow you have // new Flexible(child: new FlatButton(onPressed: ()=>print("You pressed Image No.$index"), child: _partyImage)), new Container(child: new FlatButton(onPressed: () => scaffoldKey.currentState.showSnackBar(new SnackBar( content: new Text("You pressed Image No.$index"))), child: _partyImage), width: 100.0, height: 100.0,), //Exact width and height, consider adding Flexible as a parent to the Container new Text("Text$index") ], ); }), ); } }

调整平面按钮的大小并在颤动中提供水平滚动选项

1 个答案: