Flutter 流式布局 Wrap

• 当使用Row 时，宽度超过屏幕宽时，超过部分无法显示。
• 使用Wrap时，超过屏幕宽度时，自动换行。
• 可以水平使用，也可以垂直使用
  

ap({
    Key key,
    this.direction = Axis.horizontal,             // 水平或垂直       
    this.alignment = WrapAlignment.start,         // 对齐方式        
    this.spacing = 0.0,                           // 子widget之间的间距，水平间距或垂直间距
    this.runAlignment = WrapAlignment.start,      // 纵轴方向的对齐方式  
    this.runSpacing = 0.0,                        // 纵轴方向的间距
    this.crossAxisAlignment = WrapCrossAlignment.start,  
    this.textDirection,
    this.verticalDirection = VerticalDirection.down,
    List<Widget> children = const <Widget>[],
  })

属性大部分都喝Row是一样的.就不记录了. 写个demo:

 Container(
  color: Colors.amber,
  height: 200,
  child: Wrap(
    spacing: 5,    //水平间距
    runSpacing: 5, //垂直间距
    children: <Widget>[
      Image.network(
        "https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=4032780575,3204528048&fm=26&gp=0.jpg",
        width: 100,
        height: 100,
      ),
      Image.network(
        "https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1063547563,2289391090&fm=26&gp=0.jpg",
        width: 100,
        height: 100,
      ),
      Image.network(
        "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1586237355792&di=4f65876fc2cb9e572c5b67e5494528c6&imgtype=0&src=http%3A%2F%2Fimg3.duitang.com%2Fuploads%2Fitem%2F201605%2F13%2F20160513184344_LviPQ.jpeg",
        width: 100,
        height: 100,
      ),
      Image.network(
        "https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1249774586,3389422086&fm=26&gp=0.jpg",
        width: 100,
        height: 100,
      ),
      Image.network(
        "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1586237371895&di=adf6082c8fcc78289cce9624d7bff576&imgtype=0&src=http%3A%2F%2Fwww.17qq.com%2Fimg_qqtouxiang%2F87354522.jpeg",
        width: 100,
        height: 100,
      ),
      Image.network(
        "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1586237371898&di=1b7029b71f3a9c3caa7e9e4bace0c7e0&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201509%2F29%2F20150929012659_QmNZh.jpeg",
        width: 100,
        height: 100,
      ),
    ],
  ),
),

 Container(
  color: Colors.amber,
  height: 200,
  child: Wrap(
    children: <Widget>[
      Chip(
        backgroundColor: Colors.blue,
        label: Text("北京",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("上海",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("济南",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.red,),
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("泰安",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("菏泽",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("济宁",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
        onDeleted: () {
          print(123333);
        },
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("广东",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("纽约",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("洛杉矶",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
      ),
      Chip(
        backgroundColor: Colors.blue,
        label: Text("大宁阳",style: TextStyle(color: Colors.white),),
        avatar: Icon(Icons.location_city,color: Colors.white,),
        onDeleted: () {
          print(123333);
        },
      ),
    ],
  ),
),