I handled this in a less-than-perfect way that uses some undocumented
functionality. It now works as expected, except it does not work if
focus is merely put onto the menu bar (e.g., with Control-F2).
The relevant code snippets from my application's main controller
object are below. (This is archived and restored in the MainMenu.nib,
initial NIB.)
Clearly, one should have a const NSString
*menuTrackingNotificationName defined up top and used for good style
and practice.
Cheers,
Doug
/** Set up some notification watchers **/
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
NSLog(@"applicationDidFinishLaunching");
// Watch for the main menu being opened
// Determined this using Notification Watcher
[[NSDistributedNotificationCenter defaultCenter]
addObserver:self
selector:@selector(menuOpened:)
name:@"com.apple.HIToolbox.beginMenuTrackingNotification"
object:nil];
}
/** Removes some notifications **/
- (void)applicationWillTerminate:(NSNotification *)aNotification
{
// Undo the registration from above
[[NSDistributedNotificationCenter defaultCenter]
removeObserver:self
name:@"com.apple.HIToolbox.beginMenuTrackingNotification"
object:nil];
}
/** We get this from a distributed notification set up at app launch **/
// This works, but seems to be undocumented
- (void)menuOpened:(id)dontKnowWhatThisParameterIs
{
NSLog(@"Menu opened");
[gameModel pause];
}
On Mar 20, 2007, at 1:17 PM, Doug F wrote:
Hello all,
Is there any API that will tell me when the user has opened any of
the main menu bar's menus (including the Apple menu)? I want to
"pause" my application's timers and update some state when this
occurs, but I haven't figured out a reliable way.
My first idea almost worked for all menus except the system-Apple
menu. I set up a delegate for each menu and implemented
- (void)menuNeedsUpdate:(NSMenu *)menu
which then called my "pause" routine. (Incidentally, setting the
delegate of the whole main menu did NOT ever call the above
routine; I had to set the delegate of each menu individually in
Interface Builder.)
This failed because one of my menu items was a "Pause" menu with a
hotkey. As it turns out, hitting this hotkey causes
"menuNeedsUpdate" to be invoked prior to the target/action being
called, which pauses things and updates the menu to modify the menu
item to be a "resume" (with the same hotkey (modifies the title
only)), so when the hotkey target/action was called, that turned
right around and unpaused things! That was a fun thing to figure out.
Bigger picture, though: It also fails because there is no way to
determine if the system-Apple menu has been opened.
So, I need a way to generate some sort of event or target/action
when ANY menu is opened (via click or, even, Control-F2 to focus on
the menu bar) so I can pause my application.
Would anyone have any ideas, please? I've looked at the PDFs of
Apple docs, Googled and Cocoadev'd and Cocoabuildered and either my
search abilities suck or I'm just oblivious.
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