Flutter 流式布局之Wrap

效果：

Wrap

A widget that displays its children in multiple horizontal or vertical runs.

一个可以横向或纵向显示的流式布局的widget

使用场景：一行显示不下需要换行的时候

源码

Wrap({
    Key key,
    this.direction = Axis.horizontal,//方向
    this.alignment = WrapAlignment.start,//对齐方式
    this.spacing = 0.0,//子widget 横向的间隔
    this.runAlignment = WrapAlignment.start,
    this.runSpacing = 0.0,//当横向时子widget纵向的间隔
    this.crossAxisAlignment = WrapCrossAlignment.start,
    this.textDirection,//文本方向
    this.verticalDirection = VerticalDirection.down,
    List<Widget> children = const <Widget>[],//子widget 
  }) : super(key: key, children: children);

示例

Wrap(
       spacing: 8.0, // gap between adjacent chips
       runSpacing: 4.0, // gap between lines
       children: <Widget>[
         Chip( label: Text('Hamilton') ),
         Chip( label: Text('Lafayette') ),
         Chip( label: Text('Mulligan') ),
         Chip( label: Text('Laurens') ),
       ],
     )

官方文档：​​https://api.flutter.dev/flutter/widgets/Wrap-class.html​​