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Re: How does Cocoa implement delegate/callback?
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Re: How does Cocoa implement delegate/callback?


  • Subject: Re: How does Cocoa implement delegate/callback?
  • From: Bill Cheeseman <email@hidden>
  • Date: Fri, 15 Nov 2002 13:43:50 -0500

on 02-11-15 1:08 PM, matt neuburg at email@hidden wrote:

> The answer turns out to be the contextInfo. By packaging up the relevant info
> into a dictionary in A-1 and handing this (retained!) as the contextinfo to
> NSApp beginSheet, I am then able to unpackage it in A-3. Then A-3 can call the
> right method in B and communicate to it the result of the sheet (i.e. what the
> user did there). Thus, from B's point of view, it feels just like the two
> methods involved are the first and last stages of NSApp beginSheet (the call
> to beginSheet and the callback after the sheet ends).

I understand the contextInfo stuff, and I am using it more or less as you
describe.

But I'm curious to know how you're getting A to call a method in B?
Distributed objects? Apple events?

I'm using yet a third technique. A is an "assistive" app using the new
accessibility API to communicate with B's user interface elements.

--

Bill Cheeseman - email@hidden
Quechee Software, Quechee, Vermont, USA
http://www.quecheesoftware.com

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