ButtonBar 可以默认实现一个按钮组,通过 children 属性可以传入多个 Button。
const ButtonBar({
Key key,
this.alignment = MainAxisAlignment.end,
this.mainAxisSize = MainAxisSize.max,
this.children = const <Widget>[],
})
alignment:MainAxisAlignment.end,
mainAxisSize: MainAxisSize.max,
children: <Widget>[],