如何更改 Flutter 中的 PopupMenuItem 宽度？

Question

我的代码是这样的

我想让项目宽度匹配父项 但我无法更改 PopupMenuItem 宽度。

我尝试了文本换行 Continer 并准确设置了宽度，但它不起作用。

我该怎么办？

Answer 1

弹出菜单内的容器

        new PopupMenuButton<Choice>(
            onSelected: _select,
            itemBuilder: (BuildContext context) {
              return choices.map((Choice choice) {
                return PopupMenuItem<Choice>(
                  value: choice,
                  child: new Container(
                    width: 100.0,
                    child: Text(choice.title)
                  ),
                );
              }).toList();
            },
          ),

完整示例的其他代码

  void _select(Choice choice) {
      print(choice);
  }

class Choice {
  const Choice({this.title, this.icon});

  final String title;
  final IconData icon;
}

const List<Choice> choices = const <Choice>[
  const Choice(title: 'Car', icon: Icons.directions_car),
  const Choice(title: 'Bicycle', icon: Icons.directions_bike),
  const Choice(title: 'Boat', icon: Icons.directions_boat),
  const Choice(title: 'Bus', icon: Icons.directions_bus),
  const Choice(title: 'Train', icon: Icons.directions_railway),
  const Choice(title: 'Walk', icon: Icons.directions_walk),
];