Re: custom options during save in a document app

[Fred Kiefer]

On 28.09.2012 10:28, Riccardo Mottola wrote:
> Hi,
>
> I want to handle two different filetypes during save in a document based
> application. For one of the type I need an option view in the panel to
> set some parameters.
>
> I did that in a "standard" application. There it is easy: I have a save
> method which has the task to create and display the save panel, so it
> can instantiate it, add the view, read the parameters and perform the
> save by directly writing the file.
>
> In my doc-based app however, I have a document and a window controller.
> To save I have overidden "dataRepresentationOfType" (actual work) and
> "saveDocumentAs" (to add the file extension, nothing more).
>
> dataRepresentationOfType is fine for now: currently type is "TIFF".
> Adding "JPEG" is trivial. I need however the compression rate, somehow
> an additional parameter.
>
> But where/how can I add my view to the panel and handle its parameter?
> Can I override a method I do not see or do i need to throw-away part of
> what document-based apps offer me?

You best options here is to override the method -prepareSavePanel in our 
NSDocument subclass, which is the Apple recommended way of doing this. 
You will also have to override shouldRunSavePanelWithAccessoryView to 
return NO, otherwise the standard accessory view will still be displayed.

From there on down you will have to replace all the standard NSDocument 
methods to handle your additional parameters. There is no way around that.