Re: Dismissing Open dlog before doc actually opens
Re: Dismissing Open dlog before doc actually opens
- Subject: Re: Dismissing Open dlog before doc actually opens
- From: Bryan Vines <email@hidden>
- Date: Tue, 13 Aug 2013 14:41:44 -0500
Steve,
Could you use a boolean property such as fileIsBeingRead? Set that to YES when you start the file read on the background thread, then set it back to NO when the file read has completed.
I used this technique in a proof-of-concept app. The app has a status label in its window; the label's value and "hidden" properties are bound to an NSString property and a BOOL property in the app delegate.
When the user clicks File > Open, I run the open panel modally [myOpenPanel runModal]. When the user selects a file and clicks the panel's Open button, I set the NSString property something like @"Reading File…" and set the fileIsBeingRead property to YES. Then I call a method to open the file on a background thread.
When the "open a file" method finishes reading the file, it resets the NSString and fileIsBeingRead properties, then shows an alert to let the user know the file has been read.
You are welcome to the Xcode project for the app I referenced. It's 36K, zipped.
TL;DR: You can set a property to indicate the file is being read, and by observing that property, you'll know when the read has finished.
Hope that helps.
--
Bryan Vines
On Aug 13, 2013, at 1:02 PM, Steve Mills <email@hidden> wrote:
> On Aug 12, 2013, at 21:22:07, Bryan Vines <email@hidden> wrote:
>
>> Can you run an NSOpenPanel with a completion handler block, and in that block, call a method on a background thread to actually perform the file read operation?
>
> Well, this won't work. The current code runs the dlog with runModal instead of beginWithCompletionHandler. If I change it to beginWithCompletionHandler, it returns right away and falls out of our semi-portable code for opening files before the dlog is even presented. We expect the Open dlog to be modal, not modeless. Any other ideas? I also tried calling orderOut after runModal returned, but it didn't make it go away.
>
> --
> Steve Mills
> office: 952-818-3871
> home: 952-401-6255
> cell: 612-803-6157
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