Intercepting NSPanel's changeFont: message

FROM : Glenn Howes
DATE : Fri Jan 24 20:08:10 2003

Hello,
  The quote below was from a posting back in November.  Could someone
explain to me how one changes the message NSFontPanel sends out when a
font changes? Or barring that how to prevent a selected NSTextField
from hogging the message. I've inserted an NSResponder subclass at the
top of the responder chain so I get the message when the NSTextField is
not selected.


--glenn


On Tuesday, November 26, 2002, at 09:20  PM, Andy wrote:
>>

>
> If you look really closely at the documentation, or better yet
> NSFontPanel.h, you'll see that changeFont: is not a delegate method.
> Some versions of the documentation are corrupted (I don't know if its
> fixed yet) so it looks like changeFont: is in the delegate methods
> section, but it really isn't, as the .h file will confirm.
>
> Its actually a method that is sent to the First Responder, and goes up
> the Responder chain. Catching it in the window controller might work,
> but you could have problems. For example, if you add an NSTextView to
> your application's window and click in it to give it focus, you'll
> suddenly find your code in the window controller is not called (because
> the NSTextView consumes the event rather than passing it up the chain).
>
> If this is an issue for you, check out NSFontPanel again. You'll see
> you
> can change the message sent when the font changes. eg, my app sends
> something like myChangeFont: instead,  which I catch where I want to
> catch it (looks for docs on the Responder chain) and handle. When I'm
> done handling it, I find the current first responder and send a
> changeFont: message to it. That way I get my shot at the message
> (myChangeFont:) but the regular changeFont: message is also available
> to
> anything that might be listening.

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