On Jul 8, 2009, at 6:46 AM, Graham Cox wrote:
On 08/07/2009, at 11:33 PM, I. Savant wrote:
[NSMenuItem setAttributedTitle:];
... and if you want to get really fancy (ie "modern"), you could
build the list with regular strings (just "setTitle:") relatively,
but use NSOperation/Queue to create / set the attributed titles
with the actual fonts in the background, replacing the plain-text
ones.
I suggest this because grabbing a list of font name strings is
quicker than building an attributed string for each font. Do the
quick thing first so it's available, but do the longer fancy thing
in the background, updating while the UI is idling. Remember (99.9%
of) all AppKit-related stuff should be done on the main thread.
A good idea, though I think the menu delegate can save you even this
much effort. The docs are not explicit on this point, but a careful
reading suggests that:
- (BOOL)menu:(NSMenu *)menu updateItem:(NSMenuItem *)item atIndex:
(NSInteger)index shouldCancel:(BOOL)shouldCancel
is actually invoked on some sort of background thread/queue, so
implementing these methods (the above + numberOfItemsInMenu:) in
your menu delegate would allow you to update each item with the
attributed title fairly simply and it wouldn't drag your main
thread's performance down.
--Graham
What this method does is check at regular intervals for events that
would cancel tracking. If one is detected, it passes YES for
shouldCancel. So if your design is "if the user clicks on the menu,
sit and spin until it's built," then you could use this API to detect
cancellation, to stop spinning.
However, "sit and spin" isn't a very good user experience, and Leopard
allows you to append items to a menu in the menu bar while it is
open. So for menus that may take a while to build, consider appending
the items as they come in (like the Airport status item), or showing a
"Building..." item until you're ready to add the complete set of items.
-Peter
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