> On May 19, 2016, at 22:16 , Jerry Krinock <je...@ieee.org> wrote:
>
>
>> On 2016 May 19, at 16:13, Rick Mann <rm...@latencyzero.com> wrote:
>>
>> I have a complex NSDocument with lots of files. One of those files is has a
>> .mfst extension. If the user double-clicks one of those files, I want my app
>> to create my NSDocument subclass, and then call a method on it to read the
>> contents of that file, but I don't want that to be the file it then
>> associates with the document. The actual on-disk representation is a
>> package, and can either copy the originally-opened file contents into the
>> package, or reference that file with an alias.
>>
>> At some point, the user will have to specify a location for the "real"
>> document package to live. Conversely, if the user double-clicks on the real
>> document package, I want that to behave as expected.
>>
>> How do I set up my Document Types and handle this scenario?
>
> You will need two document types (CFBundleDocumentTypes) in your Info.plist,
> one for your .mfst document, and one for the “real” document (NSDocument
> subclass / package). The .mfst should have its “role” (CFBundleTypeRole) set
> to “Reader” and will have no windows. In its -readFromURL:ofType:error:, or
> later, it will programatically create a “real” document by invoking
> -[NSDocumentController makeUntitledDocumentOfType:error:]. Cocoa will
> present the Save dialog the user clicks File > Save. Then make your alias or
> move the original file with NSFileManager, or if this is a Core Data
> document, consider using BSManagedDocument which has methods to read and
> write so-called “additional content” into document packages.
By "Reader," do you mean "Viewer?" I see no "Reader" option.
Also, what do you mean "have no windows?" I just don't create anything in
-makeWindowControllers?
> In the Document-Based App Programming Guide for Mac, read > Alternative
> Design Considerations > Multiple Document Types Use Multiple NSDocument
> Subclasses.
Yeah, I've read through that.
I'm currently doing this. I have the two document types as you described, but
both point to the same NSDocument subclass. In readFromFileWrapper(), if it's
the .mfst type, I read the data in that I can, and then:
self.fileURL = nil
self.updateChangeCount(.ChangeReadOtherContents)
So far, this does what I would expect (creates a new document with info from
the .mfst file, but if I close it, it prompts to Save As).
I have yet to write my saving code, so I don't know if this works.
--
Rick Mann
rm...@latencyzero.com
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