On 31 Dec 2008, at 4:04 am, Dong Feng wrote:
If there are more than one items, with the same NSDocumentClass, in the CFBundleDocumentTypes array of the Info.plist, I see the "Save As..." save panel will be automatically augmented with an accessor view containing a format pop-up. Meanwhile, the open panel of "Open File..." does not have an accessor view containing format pop-up, although it accepts all document types. Is there any way to have the open panel have an format pop-up accessor view automatically?
I don't believe so. Unlike the Save As case, there's a much less clear- cut case for providing such filtering based on format, since the thinking of the Open panel is that (from the user's POV) it simply shows what can be opened, and the code that reads the file figures out what to do with the format it is presented with. Why bother the user with geeky concepts such as "format" when it's not necessary? (The Save case is different, since you are committing data to disk so unfortunately if different formats are an issue the user is required to intervene as the computer is unable to read minds).
You'll have to add your own accessory panel and implement the filtering yourself if you really have to - though from the usability point of view you'll be creating a worse user experience by doing so.
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