在可可OSX编程实例化一个NSPopUpButtonCell

Question

我有一个OpenGL GUI接口和I需要有当在我的openGL的显示按下该特定按钮将被称为一个弹出菜单。我想显示类似当你按下一个NSPopUPButton但我不能用可可按钮本身弹出一个菜单。看来，做到这一点的最好办法是使用NSPopupButtonCell。我不能在这里发布我的代码，因为我写在Lisp语言的代码，并通过目标C桥访问可可，但我只是想看看下面的pseduo代码看起来像它应该显示菜单或是否有一个明显的缺陷在我逻辑：

• Pseudo Code for function that is called when button is pressed:
• Initialize an NSPopUpButtonCell Using initTextCell: "test" pullsDown: NO
• allocate an NSMenu using alloc
• add two menu items using addItem:
• set the menu of the popUpButtonCell to be the menu that was just allocated using setMenu:
• Next I tried two methods to try and get the menu to actually be displayed,
  first I tried using drawWithFrame:inView: and when that did not work I also tried 
  using drawBezelWithFrame:inView: eventhough the docs said not to use but I just 
  tried it out of desperation.
• finally, when the draw methods did not work I tried using performClick: on the 
  popupButtonCell to try and simulate the click.

这些方法中没有成功地获得任何种类的菜单的显示。有一些其他的方式来程式设计弹出包含在小区中的菜单？

Answer 1

我认为你正在寻找的 trackMouse:inRect:ofView:untilMouseUp:的NSCell 方法

[theCell trackMouse:[NSApp currentEvent] inRect:NSZeroRect ofView:theView untilMouseUp:YES];

Answer 2

我想你会过得更好使用纯NSMenu并调用+[NSMenu popUpContextMenu:withEvent:forView:]。如果你只靶向10.6及更高版本，您可能还检查出-[NSMenu popUpMenuPositioningItem:atLocation:inView:]，它使您可以在菜单的定位多一点控制。只实现mouseDown:在你看来，构造菜单（或从笔尖文件加载），并显示它，并NSMenu应该从那里的所有细节。只要确保每个NSMenuItem的目标和动作被设定为使得当选择的项目的操作方法被正确调用。