如何防止扩展nativeselect contentcell vaadin

Question

我在这样的表单布局中使用本机选择：
可以看到我原生的select内容太长了：

  accountType = new NativeSelect("Account Type:");
    accountType.setRequired(true);
    accountType.setNullSelectionItemId("--Select--");
    accountType.addItem("Regular Savings");
    accountType.addItem("Silver Savings");
    accountType.addItem("Gold Privilege");
    accountType.addItem("Advantage Premium Savings");

    idProof = new NativeSelect("ID Proof:");
    idProof.setSizeFull();
    idProof.setRequired(true);
    idProof.setNullSelectionItemId("--Select--");
    idProof.addItem("Arms License issued by State/Central Government authorities");
    idProof.addItem("Bank Pass Book with photograph issued  or its susidiaries or Nationalised Banks");


    FormLayout fLayout = new FormLayout(accountType,idProof);

然后我将这个formlayout添加到horizo​​ntalLayout

 HorizontalLayout hlayout = new HorizontalLayout(fLayout,fLayout2);

但我的 idProof 下拉单元格内容扩展了父级的宽度。
无论内容宽度如何，如何强制下拉菜单保持在父布局内​​？

Answer 1

idProof.setWidth(20, Unit.EM);

当然，您可以选择任何您想要的宽度，并且不再需要 idProof.setSizeFull()。