If you add the menu as a child of the label itself, then the menu might not show up at all because the label will measure the text that it holds and create a dimension that fits the text only.

如果您将菜单添加为标签的子元素，那么菜单根本就不会显示，因为标签将仅度量它所包含的文本，然后创建一个符合文本的大小。

youdao

Dimension line with label that automatically changes to match length. Text position and extension lines are adjustable.

带自动匹配长度的标签的尺寸线。文本位置和延长线是可调整的。

youdao

Dimension line with label that automatically changes to match length.

带自动匹配长度的标签的尺寸线。

youdao