Re: Document Based Application
Re: Document Based Application
- Subject: Re: Document Based Application
- From: koko <email@hidden>
- Date: Sun, 08 Jul 2012 09:03:09 -0600
I have 29 file types and wanted to get away from the if or switch to open them and let NSDocument pick the right class for me.
As I understand it, an Item in the Document types array of the plist contains and entry for an NSDocument class.
And yes, each type has a unique extension (possibly multiple). I.e. type phobia has extensions pho, pho12, pho15 all mapped to NSDocument subclass MYPhobia.
-koko
On Jul 7, 2012, at 7:07 PM, Graham Cox wrote:
>
> On 08/07/2012, at 8:41 AM, koko wrote:
>
>> My Document Based Application is to have n document types.
>>
>> Is it then proper to create n subclasses of NSDocument and the corresponding plist Document types entries, i.e. Item 0 thru Item n-1 ?
>
>
>
> You can do it that way, or you can let a NSDocument subclass handle multiple types if they are quite similar, or a bit of both. i.e. it depends. In my app I have one document subclass for a number of filetypes, because they all end up as the same document type with the same internal data model.
>
>> Is it true that all n document types will have a common extension but will be identified by the Document types entires?
>
>
> If they all have the same extension then the system can't distinguish when a file is opened by your app what document object class it should instantiate, so that won't work.
>
> --Graham
>
>
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