So, just to follow up.
Timer approach works.
It works quite well. Thanks for recommending it.
In fact, far better than the CGEventTap approach in terms of reliability.
CGEventTaps always seem to be a bit flaky.
The NSTimer approach is very responsive and I can constrain it to just the time
when the interesting menu is displayed and it’s a lot less code than CGEventTap.
Borrowing from the old Dave DeLong post (I don’t do exactly the same thing of
course as that post was about achieving a slightly different behavior.)
Initially, I didn’t go with the timer approach as it seems so different from
the normal event stream but menus seem to be that way.
So, I add a timer to my app delegate that only runs when the menu in question
matches the menu I am interested in.
In
- (void)menuWillOpen:(NSMenu *)menu
I simply add a timer to the NSEventTrackingRunLoopMode
[[NSRunLoop currentRunLoop] addTimer:_timer
forMode:NSEventTrackingRunLoopMode];
Then I invalidate it if it isValid and not nil in
- (void)menuDidClose:(NSMenu *)menu
I may need to tweak the timing of the timer so it isn’t overkill but is
responsive.
The timer calls a method to check the modifierFlags
NSUInteger flags = [NSEvent modifierFlags];
if ((flags == NSControlKeyMask) || flags ==
(NSControlKeyMask|NSAlphaShiftKeyMask)) {
and handle if the control is down or not.
I will file a documentation bug requesting it be in a tech note or in a doc
related to NSEvent or NSMenu as it is not an obvious thing to do, but could
certainly be useful for others.
On Jan 25, 2014, at 5:15 AM, Jens Alfke <j...@mooseyard.com> wrote:
> Have you tried running a timer that periodically checks the state of the
> modifier keys and adds/removes the menu item?
>
> —Jens
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