Re: [Rubycocoa-talk] Sporadic application failure

[Tim B. <tim...@gm...>]

Hi Tim,

Your post reminded me of a problem that I recently had while working  
with Nu.  So I ported your example to Nu and saw the same message.  I  
think the problem is in the PSMTabBarControl framework.  If you look  
at PSMTabBarControl.m, you'll see this method:

- (void)tabViewDidChangeNumberOfTabViewItems:(NSTabView *)aTabView
{
     NSArray *tabItems = [tabView tabViewItems];
     // go through cells, remove any whose representedObjects are not  
in [tabView tabViewItems]
     NSEnumerator *e = [_cells objectEnumerator];
     PSMTabBarCell *cell;
     while(cell = [e nextObject]){
         if(![tabItems containsObject:[cell representedObject]]){
             [self removeTabForCell:cell];
         }
     }
    ...

This method is, in fact, mutating the _cells collection while it is  
enumerating it.  I've heard that Leopard treats this more strictly, so  
that might explain the exception.  I modified this method, replacing  
the call that creates the object enumerator with this:
     NSEnumerator *e = [[[_cells copy] autorelease] objectEnumerator];

After rebuilding and reinstalling the framework, my example worked  
correctly.

The Nu version of your example is here: http://programming.nu/files/NuPSMTabDemo.tgz 
.

-- Tim

p.s. All the code that I wrote was in one file, as follows.  It should  
be easy to see the correspondence back to RubyCocoa.

;; main.nu
;;  Copyright (c) 2007 Tim Burks, Neon Design Technology, Inc.

(load "PSMTabBarControl")
(load "Nu:nu")          ;; basics
(load "Nu:cocoa")       ;; cocoa definitions

(class TabController is NSObject
      (ivar (id) tab_bar (id) tab_view)

      (- awakeFromNib is
         (self add_new_tab:self)
         (@tab_bar setStyleNamed:"Aqua")
         (@tab_bar setHideForSingleTab:NO)
         (@tab_bar setAllowsDragBetweenWindows:NO))

      (- add_new_tab:sender is
         (set new_item ((NSTabViewItem alloc) init))
         (new_item setLabel:"Badger")
         (@tab_view addTabViewItem:new_item)
         (@tab_view selectTabViewItem:new_item))

      (- close_tab:sender is
         (@tab_view removeTabViewItem:(@tab_view selectedTabViewItem))))

;; this makes the application window take focus when we've started it  
from the terminal
((NSApplication sharedApplication) activateIgnoringOtherApps:YES)

;; run the main Cocoa event loop
(NSApplicationMain 0 nil)


On Dec 2, 2007, at 2:01 PM, Tim Perrett wrote:

> Hey all,
>
> I've implemented PSMTabBarControl ( http://www.positivespinmedia.com/dev/PSMTabBarControl.html
>  ) in my application, however I seem to get random failures
> complaining like so:
>
> `NSApplicationMain': NSGenericException - *** Collection <NSCFArray:
> 0x5598d0> was mutated while being enumerated. (OSX::OCException)
> 	from /Users/timperrett/Desktop/RubyPSMTabDemo/build/Release/
> RubyPSMTabDemo.app/Contents/Resources/rb_main.rb:22
>
> Now, I only see this message (and subsequent crash) when I try to
> close a tab that is not currently selected. This however does not
> happen in the example that is coded in Obj-C (supplied in that
> download from PSM). Ive translated all the relevant code; the main
> difference being there example is document based and my translation is
> not. The framework obviously works (see the PSM example), but yet the
> translation does not.
>
> Nib wise, I have tried with the PSM delegate both specified, and un-
> specified, but it makes no difference. This leads me to think that it
> must be trying to either do something back across the bridge thats
> illegal, or there might be some kind of conflict with RC?
>
> Ive posted up a sample app here (and commented out any translated
> functionality that isnt essential): http://download.timperrett.com/software/RubyPSMTabDemo.zip
>
> Anybody's thoughts would be much appreciated :)
>
> Cheers
>
> Tim
>
>
>
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