如何使用下拉菜单实现工具栏按钮? [英] How to implement a toolbar button with drop down menu?

问题描述

以下图片是邮件"应用工具栏的一部分的屏幕截图.标志按钮显然是带有下拉菜单的NSSegmentedCell按钮.我希望按钮在单击图标部分时具有标准的动作，并且在单击V形时会下拉菜单.有标准的方法吗?我使用了2段NSSegmentedButton可以实现我想要的大多数功能，但是当我将菜单分配给第二段时，我无法显示人字形图标.

The following picture is a screenshot of part of Mail app’s toolbar. The flag button is apparently an NSSegmentedCell button with a drop down menu. I want the button to have a standard action when clicked on the icon part, and a menu to drop down when the chevron is clicked. Is there a standard way to do it? I used a 2 segment NSSegmentedButton that achieves most of what I want, but I can’t get the chevron icon to show when I assign a menu to the second segment.

如果有该V形字形的系统模板，我可以使其工作.除了自己绘制以外，还有其他方法可以得到吗?

I could make it work if there was a system template for that chevron. Is there any other way to get it other than drawing it myself?

推荐答案

事实证明，NSSegmentedControl提供了setShowsMenuIndicator，它像NSPopupButton一样为段绘制了向下的V形.不幸的是，仅从macOS 10.13起可用.

It turns out NSSegmentedControl provides setShowsMenuIndicator that draws the down chevron for a segment just like an NSPopupButton. Unfortunately, it’s only available from macOS 10.13 onwards.

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