Re: Removing/Adding views in drawRect:

FROM : Andrew Merenbach
DATE : Thu Aug 31 06:58:57 2006

Hi, Mike.  In regard to (2), you may wish to do something like (in 
accordance with Uli's suggestion) in the class that handles the 
adding and removing of subviews:

[[NSNotificationCenter defaultCenter] addObserver:self 
selector:@selector(addOrRemoveSubviewsDuringResize:) 
name:NSWindowDidResizeNotification object:myWindow];

This will cause -addOrRemoveSubviewsDuringResize: to be called 
whenever the pixel dimensions of myWindow change.  Change the 
observer if you need a different object to handle the adding or 
removing of subviews.

Cheers,
   Andrew

On Aug 30, 2006, at 1:56 PM, Uli Kusterer wrote:

> Am 30.08.2006 um 20:40 schrieb Mike R. Manzano:

>> (1) Is it prudent to add or remove subviews in drawRect:?

>
>  No. Moving views can cause a view to be invalidated, which would 
> cause drawRect: to be called again. If you search the list archives 
> you'll se epostings from lots of people who did it anyway and got 
> hilarious endless loops, dropped updates and other odd behaviour.
>

>> If not,
>>
>> (2) Is it prudent to add or remove views somewhere else during a 
>> window live resize?

>
>  I think there's a notification sent when auto-resizing happens. 
> Alternatively, you could just override that method (don't remember 
> the name, but a quick read of NSView.h should make it obvious) 
> that's called when a superview is resized and asked to resize its 
> subviews. That should be a safe place to show/hide subviews before 
> calling through to super.
>
> Cheers,
> -- M. Uli Kusterer
> http://www.zathras.de
>
>
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