Re: GWorkspace Dragndrop Question

[Enrico Sersale]

On 2003-06-23 16:32:18 +0300 Fred Kiefer <address@hidden> wrote:

> Hi Chad,
>
> what you describe is an inconsistency between GWorkspace and the GNUstep GUI. 
> And as you did find out GUI in this case is right, as it does the same as 
> Cocoa. They both expect the copy/paste of NSFilenamesPboardType to work with 
> the propertylist interface of the pastboard (which internally uses an 
> NSSerializer), wheras GWorkspace uses an NSArchiver for the same task. The 
> difference can be seen in the method on [NSView 
> dragFile:fromRect:slideBack:event:] in GUI and the methods on IconViewsIcon in 
> GWorkspace. Gworkspace will need some corrections here.

Ok, I can correct this in ten minutes :-) But, due of my bad English, I don't 
understand well if I can pass an array to -setPropertyList:forType:. GWorkspace 
uses only arrays, even with a single file.

> I am also not sure if the GNUstep implementation is fully correct, as a single 
> filename may be set here, where I would always expect an array of filenames. 
> But than again, I did write this code some time ago, so it may be wrong. It 
> looks like this is closely related with NSImage also only expecting one file 
> name in the pasteboard. Both should be corrected.
>
> Fred
>
> address@hidden wrote:
> > Ok, I think I got it...
> >
> > GNUstep doest like to use:
> > NSArray* files = [pasteboard propertyListForType:NSFilenamesPboardType],
> >
> > (but Cocoa does)
> >
> > Instead I used a :
> >
> > NSData* pbData = [pasteboard dataForType:NSFilenamesPboardType]
> > and then did a
> > NSArray* files = [NSUnarchiver unarchiveObjectWithData: pbData]
> >
> > to get the filenames and it seems to work fine...
> >
> >
> > Now I wonder if this will work in Cocoa...  This method of doing this seems to 
> > be depreciated in Cocoa.
> >
> > Chad
> >
> >
> > On Saturday, June 21, 2003, at 11:19  PM, address@hidden wrote:
> >
> > > Hello Enrico,
> > >
> > > I'm making a pure OpenStep Dock.app, in both Cocoa & GNUstep.  But I'm having a 
> > > problem with drag events from GWorkspace.
> > >
> > > When my app is running in OS X, I can retrieve the filenames being dragged (we 
> > > both know how that is done) from the Finder with no problem at all.
> > >
> > > However in GNUstep, when I'm getting doing my draggingUpdated and looking for 
> > > what files GWorkspace is passing I can't get a valid NSArray of NSStrings from 
> > > [pasteboard propertyListForType: NSFilenamesPboardType, I get a nil.
> > >
> > > Before I do that I do check to see if you are passing a NSFilenamesPboardType and indeed 
> > > you are.  However, when (Gnustep version) NSProperty tries to deserialize it it chokes 
> > > and return nil.  Gnustep consoles out a "Bad serialized data"
> > >
> > > Any idea why this is happening?  I imagine I am writing the first app that tries to 
> > > accept dragged files from GWorkspace so maybe you are doing something odd in your 
> > > D&D, or maybe this is a gnustep bug?  I would greatly appreciate it if you 
> > > could check this out on your end.  I'm gonna take a stab at the GWorkspace sources 
> > > myself but you know them way better than I do, of course, so you may already be 
> > > aware of what type of problem is going on.
> > >
> > > I'm also gonna post this in gnustep-dev in case it is a gnustep bug that 
> > > somewhere there can shed some light on.
>
>
>
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