Re: Drag'n'drop problems

[John Coppens <john jcoppens com>]

On Mon, 08 Sep 2008 11:03:39 -0600
Jeffrey Barish <jeff_barish earthlink net> wrote:

> > So the string _is_ interpreted somewhere (outside of my program, that
> > is). To be specific, the drag seems to work, but drop doesn't - no
> > event is generated in the second case. BTW, it's not just "STRING". I
> > tried with several other things, like "xml_node_pointer" (which
> > described what I was doing), but that didn't work either.
> 
> I was going to tell you that you are crazy, but when I tried putting
> GTK_TREE_MODEL_ROW in my program in place of the arbitrary string that I
> was using, I found that the behavior of my program changed to something
> bizarre (I get too many signals).  So I am forced to agree that
> GTK_TREE_MODEL_ROW is interpreted somewhere.  It's news to me.  I have
> always used an arbitrary string that matches in the source and
> destination specifications.

Thanks for that test - it does eliminate fears of other problems in my
program... In my case it was simple - with anything but
GTK_TREE_MODEL_ROW the drop callbacks are _not_ called at all. The
question is (for me, at least): where is the list of predefined values?

> > The problem I'm now stuck with is what to do with the path I receive
> > in data_received (the destination path). I made a simple
> > (destination) tree, and get 'drop possibles' like this:
> > 
> > -------------------------> Ok
> > "Main item"--------------> Ok
> > -------------------------> No
> >   -----------------------> Ok
> >   "Subitem 1"------------> No
> >   -----------------------> Ok
> >   "Subitem 2"------------> No  
> > 
> > BUT, if I convert those paths into iters, and set some data, I'm
> > destroying the next existing item. Do I have to insert an item before
> > the path/iter? I'll try that next. It wouldn't explain why I get a
> > 'possible' on "Main item" though.
> 
> The PyGTK FAQ has some hints:
> 
> http://faq.pygtk.org/index.py?req=show&file=faq13.030.htp

Ok - that example doesn't use DnD, it directly pushes a row up or down,
but maybe it clears up some things about the insertion. Also, as far as I
can understand it, it works only for GtkListStores, not for TreeStores.

Maybe I have to go back to the lower level interface (the one with the x
and y coordinates).

Thanks again,
John