How does Apple update the Airport menu while it is open? (How to change NSMenu when it is already open)

by

Menu mouse tracking is done in a special run loop mode (NSEventTrackingRunLoopMode). In order to modify the menu, you need to dispatch a message so that it will be processed in the event tracking mode. The easiest way to do this is to use this method of NSRunLoop:

[[NSRunLoop currentRunLoop] performSelector:@selector(updateTheMenu:) target:self argument:yourMenu order:0 modes:[NSArray arrayWithObject:NSEventTrackingRunLoopMode]]

You can also specify the mode as NSRunLoopCommonModes and the message will be sent during any of the common run loop modes, including NSEventTrackingRunLoopMode.

Your update method would then do something like this:

- (void)updateTheMenu:(NSMenu*)menu
{
    [menu addItemWithTitle:@"Foobar" action:NULL keyEquivalent:@""];
    [menu update];
}

More Related Contents:

  1. Gap above NSMenuItem custom view
  2. Subclassing NSOutlineView [closed]
  3. What’s the Best Way to Shuffle an NSMutableArray?
  4. Why shouldn’t I use Objective C 2.0 accessors in init/dealloc? [closed]
  5. Why are Objective-C delegates usually given the property assign instead of retain?
  6. Deep copying an NSArray
  7. How to compare two dates in Objective-C
  8. Compiler error: “initializer element is not a compile-time constant”
  9. How to find out who called a method?
  10. Trouble with floats in Objective-C
  11. Using NSPredicate to filter an NSArray based on NSDictionary keys
  12. self.variable and variable difference [duplicate]
  13. Run NSRunLoop in a Cocoa command-line program
  14. How do I make and use a Queue in Objective-C?
  15. What is the visibility of @synthesized instance variables?
  16. How can my app detect a change to another app’s window?
  17. Implementing -hash / -isEqual: / -isEqualTo…: for Objective-C collections
  18. iTunes Song Title Scrolling in Cocoa
  19. Removing duplicates from NSMutableArray
  20. Send notification to Mountain lion notification center
  21. Determine if NSNumber is NaN
  22. What happens if two ObjC categories override the same method?
  23. What does Apple mean when they say that a NSManagedObjectContext is owned by the thread or queue that created it?
  24. Properties and Instance Variables in Objective-C
  25. Chaining Core Animation animations
  26. Objective C – getting line number or full stack trace from debugger error?
  27. Xcode linker error: file too small for architecture x86_64
  28. viewDidLoad in NSViewController?
  29. +[NSString stringWithString:] — what’s the point?
  30. Listen to a value change of my text field

Leave a Comment