Re: SaveDocumentTo:
Re: SaveDocumentTo:
- Subject: Re: SaveDocumentTo:
- From: publiclook <email@hidden>
- Date: Fri, 18 Apr 2003 10:28:41 -0400
There is no magic about the NSDocument class etc. in Cocoa. The
TextEdit example shows how to roll your own document classes. I think
there is an example in "Cocoa Programming" too. You don't have to call
saveDocumentTo: at all. Just write a -dataRepresentationOfSelection
method, call it from your performSaveSelection: method and save the
data in any file you want.
On Friday, April 18, 2003, at 05:12 AM, Phill Kelley wrote:
G'Day!
Does anyone understand how to mimic the functionality of NSDocument's
saveDocumentTo: method?
What I'm trying to do is to implement a menu command called "Save
Selection..." which should:
1. Save only the model objects represented by the elements selected
in the view.
2. Do it in a way which behaves like saveDocumentTo:, specifically:
a. A new file is created;
b. The document's change-count is not changed; and
c. The document's title is not changed.
What I'm doing at the moment is:
1. My File menu has:
"Save" connected to FirstResponder.saveDocument:
"Save As" connected to FirstResponder.saveDocumentAs:
"Save Selection" connected to FirstResponder.performSaveSelection:
2. My document implements:
- (IBAction) performSaveSelection:(id)sender
{
itsSaveSelection = YES;
[self saveDocumentTo:sender];
}
3. The document overrides saveDocument: and saveDocumentAs: where
each is implemented like:
- (void) saveDocument:(id)sender
{
itsSaveSelection = NO;
[super saveDocument:sender];
}
4. Finally, dataRepresentationOfType includes the logic:
if (itsSaveSelection)
// return an NSData containing only the selection
else
// return an NSData containing everything
This works reliably but it seems overly complicated (as in, there's
usually
an elegant way to do things in Cocoa; all you have to do is find the
sucker).
I started by messing around with saveDocumentWithDelegate but
everything I
tried behaved like Save As (ie, cleared the change-count and changed
the
document title) which isn't what I want.
I could also change performSaveSelection: so that it implements all the
required functionality (displaying the save sheet, and writing the
selection out to the nominated file) but that also seems like overkill
for
what should, logically, be far more straightforward.
Has anyone else faced this problem? Any ideas?
Regards & thanks, Phill
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