2017-11-11 111 views
1

我正在尋找一些指導來創建分隔符的列表視圖。例如,我想從按日期分組的數據庫中獲取消息,並按照日期將消息與某些圖形或行等分開,然後在分隔符下面顯示消息。試試這個撲動,任何指導或推動正確的方向將不勝感激。顫動組列表與分隔符

回答

3

我的設計的醜陋道歉,但只是爲了告訴你,你幾乎可以建立自己的設計,你的願望,這是一個簡單的例子:

enter image description here

import "package:flutter/material.dart"; 
import 'package:meta/meta.dart'; 

class Test extends StatefulWidget { 
    @override 
    _TestState createState() => new _TestState(); 
} 

class _TestState extends State<Test> { 
    @override 
    Widget build(BuildContext context) { 
    return new Scaffold(
     appBar: new AppBar(
     title: new Text("Test"), 
    ), 
     body: new ListView.builder(
     // itemCount: myData.lenght(), 
      itemCount: 20, 
      itemBuilder: (BuildContext context, int index) { 
      //sort my data by timestamp before building 
      return new CustomWidget(date: "Convert my time stamp to date", 
       content: "My Awesome Content", 
       trailingIconOne: new Icon(Icons.share, color: Colors.blueAccent,), 
       trailingIconTwo: new Icon(
       Icons.favorite, color: Colors.redAccent,),); 
      }), 
    ); 
    } 
} 

class CustomWidget extends StatelessWidget { 
    String date; 
    String content; 

    Icon trailingIconOne; 

    Icon trailingIconTwo; 

    CustomWidget(
     {@required this.date, @required this.content, @required this.trailingIconOne, @required this.trailingIconTwo}); 

    @override 
    Widget build(BuildContext context) { 
    return new Container(
     decoration: new BoxDecoration(
      border: new Border.all(color: Colors.grey[500]) 
    ), 
     child: new Column(
     children: <Widget>[ 
      new Container (child: new Text(date), color: Colors.yellow[200],), 
      new Container(height: 15.0,), 
      new Text(content), 
      new Row(
      mainAxisAlignment: MainAxisAlignment.end, 
      children: <Widget>[ 
       new IconButton(icon: trailingIconOne, onPressed:() {}), 
       new Container(width: 10.0,), 
       new IconButton(icon: trailingIconTwo, onPressed:() {}) 
      ], 
     ) 
     ], 
    ), 
    ); 
    } 
} 

對於更好的設計,你可以擺脫邊框並使用Divider來代替:

return new Container(
     child: new Column(
     children: <Widget>[ 
      new Column (children: <Widget>[ 
      new Container (child: new Text(date), color: Colors.yellow[200],), 
      new Container(height: 15.0,), 
      new Text(content), 
      new Row(
       mainAxisAlignment: MainAxisAlignment.end, 
       children: <Widget>[ 
       new IconButton(icon: trailingIconOne, onPressed:() {}), 
       new Container(width: 10.0,), 
       new IconButton(icon: trailingIconTwo, onPressed:() {}), 
      ],), 

       new Divider(height: 15.0,color: Colors.red,), 
      ], 
     ) 
     ], 
    ), 

而且在我看來,更好的視覺解決方案是使用一個Card代替Container

return new Card(
     child: new Column(
     children: <Widget>[ 
      new Column (children: <Widget>[ 
      new Container (child: new Text(date), color: Colors.yellow[200],), 
      new Container(height: 15.0,), 
      new Text(content), 
      new Row(
       mainAxisAlignment: MainAxisAlignment.end, 
       children: <Widget>[ 
       new IconButton(icon: trailingIconOne, onPressed:() {}), 
       new Container(width: 10.0,), 
       new IconButton(icon: trailingIconTwo, onPressed:() {}), 
      ],), 

      // new Divider(height: 15.0,color: Colors.red,), 
      ], 
     ) 
     ], 
    ), 
    ); 
+1

謝謝,我認爲是足夠讓我從正確的方向開始。如果我一路卡住,我會發佈一個新項目。 – Robert

+0

不要那樣做!使用'new Divider()'而不是灰色邊框...... – Darky

+0

無論如何,我並不打算展示一個偉大的設計,是的Divider更好,但只是在這個特定的佈局中,它需要調整才能產生效果。我在最後添加了更改,如果我們使用Card而不是Container作爲父級,那麼這可能會是一個更好看的設計,但此示例僅用於表明您可以自定義自己的小部件。 – aziza

0

雖然這可能並不適用於您的情況,一個簡單的方法來分隔添加到ListView是使用ListView.divideTiles

// Adapted from https://flutter.io/flutter-for-android/#listviews--adapters 

import 'package:flutter/material.dart'; 

void main() { 
    runApp(new MyApp()); 
} 

class MyApp extends StatelessWidget { 
    @override 
    Widget build(BuildContext context) { 
    return new MaterialApp(
     title: 'Flutter Demo', 
     theme: new ThemeData(
     primarySwatch: Colors.blue, 
    ), 
     home: new ListExamplePage(), 
    ); 
    } 
} 

class ListExamplePage extends StatelessWidget { 
    @override 
    Widget build(BuildContext context) { 
    // https://docs.flutter.io/flutter/material/ListTile/divideTiles.html 
    var dividedWidgetList = ListTile.divideTiles(
     context: context, 
     tiles: _getListData(), 
     color: Colors.black).toList(); 

    return new Scaffold(
     appBar: new AppBar(
     title: new Text('List Example'), 
    ), 
     body: new ListView(children: dividedWidgetList) 
    ); 
    } 

    _getListData() { 
    List<Widget> widgets = []; 
    for (int i=0; i<100; i++) { 
     widgets.add(
     new Padding(
      padding: new EdgeInsets.all(10.0), 
      child: new Text('Row $i')) 
    ); 
    } 
    return widgets; 
    } 
} 

編輯:

對於動態生成列表,ListTile.divideTiles不是正確的選擇。在其中列表項目建成階段添加分隔可能是最好的一段路要走:

import 'package:flutter/material.dart'; 

void main() { 
    runApp(new MyApp()); 
} 

class MyApp extends StatelessWidget { 
    @override 
    Widget build(BuildContext context) { 
    return new MaterialApp(
     title: 'Flutter Demo', 
     theme: new ThemeData(
     primarySwatch: Colors.blue, 
    ), 
     home: new ListExamplePage(), 
    ); 
    } 
} 

class ListExamplePage extends StatelessWidget { 
    @override 
    Widget build(BuildContext context) { 
    return new Scaffold(
     appBar: new AppBar(
      title: new Text('List Example'), 
     ), 
     body: new ListView.builder(
      itemBuilder: (BuildContext context, int position) => 
       // Try using either _getRowWithDivider or _getRowWithBoxDecoration 
       // for two different ways of rendering a divider 
       _getRowWithDivider(position), 
     )); 
    } 

    /// Returns the widget at position i in the list, separated using a divider 
    Widget _getRowWithDivider(int i) { 
    var children = <Widget>[ 
     new Padding(padding: new EdgeInsets.all(10.0), child: new Text('Row $i')), 
     new Divider(height: 5.0), 
    ]; 

    return new Column(
     crossAxisAlignment: CrossAxisAlignment.start, 
     children: children, 
    ); 
    } 

// Returns the widget at position i in the list, separated using a BoxDecoration 
    Widget _getRowWithBoxDecoration(int i) { 
    return new Container(
     decoration: new BoxDecoration(
      border: 
       new Border(bottom: new BorderSide(color: Colors.grey[100]))), 
     child: new Padding(
      padding: new EdgeInsets.all(10.0), child: new Text('Row $i'))); 
    } 
} 
+0

這看起來很有希望,如果我通過http調用得到我的消息列表,那麼我將它放在一個列表中,現在我使用listview。生成器併爲每個項目應用一個小部件,但是現在我需要一個按日期分割的日期,每個日期可以是1或多個。我現在正在嘗試做一個列表視圖,其中包含消息列表視圖,但是與大小錯誤對等。您的解決方案看起來更直接,接受日期所需的分隔符而不是每個分隔符。任何建議都會很棒。 – Robert

+0

對於動態列表,不幸的是ListTile.divideTiles不會爲你工作。我建議使用aziza的建議,並在每行構建小部件時插入分隔符(或BoxDecoration)。我將更新一個不同的代碼片段來演示。 –

0

簡單地把ListItemContainer,並添加裝飾:

@override 
    Widget build(BuildContext context) { 
    return new Container(
     child: new ListTile(
      title: new Text('I have border') 
     ), 
     decoration: 
      new BoxDecoration(
       border: new Border(
        bottom: new BorderSide() 
       ) 
      ) 
     ); 
    }