如何更改 NSPopUpButton 中 NSMenuItem 的简短显示形式？
我有一个 NSPopUpButton ，其中有一个很长的项目菜单，其中一些项目非常宽 - 比按钮的闭合宽度更宽。一些菜单项标题如下所示：
“一个非常长的名称的开头不是那么有趣（重要信息）”
当菜单关闭时，它显示为：
“一个真正的长名称的开始”长名称不是...”
我希望它显示为：
“真正的l...（重要信息）的开始”
我不知道NSPopUpButton如何正在创建那个省略号。 NSMenuItem 上是否调用了选择器？ NSPopUpButton 或 NSMenu 是否以某种方式处理该问题？
我需要子类化哪个类以及需要覆盖或实现哪个选择器？
非常感谢。
I have an NSPopUpButton with a long menu of items, some of which are quite wide - wider than the button's closed width. Some of the menu item titles are like so:
"Start of a really long name not that interesting (important info)"
When the menu is closed, this displays as:
"Start of a really long name not th..."
I'd like it to display as:
"Start of a really l... (important info)"
I can't figure out how NSPopUpButton is creating that ellipsis. Is there a selector being called on NSMenuItem? Does NSPopUpButton or NSMenu handle that somehow?
Which class do I need to subclass and which selector to I need to override or implement?
Many thanks.
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这种机制称为截断。 Interface Builder 中有一个名为换行符的选项，它分组在控制组中。您可能正在寻找的设置称为“截断中间”，它将开始从菜单项的中间选取字母。
但请注意，这并不能完全解决您的问题，因为
（重要信息）部分可能不是“…”之后唯一剩下的部分，而是我的 Me…tem 的名称（重要）信息）。此外，您可能还会得到部分被截断的重要信息。但我认为只要重要信息是一些数字或几个字母，你就可以。也许向菜单项添加图像可能更适合您的需求（某种徽章）？也许属性字符串还有一个选项可以强制字母不被截断……但不确定。
This mechanism is called truncation. There is an option in Interface Builder called Line Breaks which is grouped in the Control group. The setting you're probably looking for is called
Truncate Middlewhich will start picking letters from the middle of the menu item.Note however that this won't solve your problem entirely as the
(important info)part might not be the only one remaining after "…", but ratherName of my Me…tem (important info). Furthermore you might also end up with the important info partially truncated. But I figure you're fine as long as the important info is some number or a few letters.Maybe adding an image to the menu item might suit your needs more (some sort of badge)? Maybe there is also an option for attributed strings to force letters to not be truncated… not sure however.
法比安给了我我需要的线索。谢谢！
不过，如果有办法获得更细粒度的控制，那就更好了。有没有办法更精确地控制截断？
Fabian gave me the clue I needed. Thanks!
However, if there is a way to get finer-grained control, that would be even better. Is there a way to control the truncation more precisely?