Re: Updating a progress bar from a code loop
Re: Updating a progress bar from a code loop
- Subject: Re: Updating a progress bar from a code loop
- From: "Michael Ash" <email@hidden>
- Date: Tue, 10 Jun 2008 09:51:46 -0700
On Tue, Jun 10, 2008 at 3:17 AM, Graham Cox <email@hidden> wrote:
> Thanks for the suggestions - basically I have to run my loop on a thread,
> seems to be what you're both saying.
>
> In this case I can do that... though out of curiosity I wonder if there is a
> way to do this "cooperatively" on the main thread without having to break up
> the loop doing the actual work. For example, in Carbon one can run the event
> loop for a short period or just for one event on each cycle of the loop -
> and this code can live in the progress dialog controller, so it works
> transparently with respect to the loop that drives the progress indicator.
> I'm not sure that approach is considered "good" in this day and age though I
> used it a lot on Mac OS 6/7/8/9. Just wondered if such an approach is
> feasible in Cocoa.
Take a look at -[NSApplication beginModalSessionForWindow:] and the
friends described in the docs for that method. This lets you start a
modal window, run it at intervals to keep events processing, then
close it when done. Of course this requires putting your progress bar
in a modal window, but if you're not going to allow the rest of the
program to run then this is a good idea anyway.
Mike
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