On Sat, Jan 25, 2014 at 11:34 AM, Daniel Wagner <dan...@wagner-home.com> wrote: > Hm, that's annoying. I wonder if you could cook up a small example of > this that we could play around with? Perhaps we can work out what needs > to change to get this working.
I'll look into doing this, but do see the message I just sent. If my analysis is right, it may be as simple as removing what I believe to be an incorrect assertion. > > As a workaround in the meantime, I wonder whether prefetching one level > deeper would work (though I perfectly understand that this could be a > significant cost). What you say above is exactly right. Yes, it would work around the problem, but at a signficant cost, both in processing time and my having to write a bit more code. I prefer to suspend my work on this until gtk2hs gets fixed. Thanks -- /Don > > ~d > > On 2014-01-24 09:52, Donald Allen wrote: >> I've written a personal finance manager, having become dissatisfied >> with Gnucash after many years of use. My own system, Newcash, is >> written in C/GTK3/Sqlite3 (I will be making it available via github >> when the documentation is ready). In recent months, I've become >> interested in Haskell (I've written a lot of Lisp and Scheme code over >> the years) and I re-wrote the Newcash report generator (originally >> written in Python to process Gnucash's xml file and thus was pretty >> ugly and needed re-writing) in Haskell. Enthusiastic about the >> language and pleased with the performance of the report generator, I >> decided to experiment with re-writing Newcash itself in Haskell, for >> all the reasons that Haskell is to be preferred to C. >> >> >> But I've run into a show-stopper. Here's the situation: the Newcash >> initial window displays the tree of accounts. Not wanting to endure >> long startup times (a big issue with Gnucash), I initially want to >> populate the tree model with the root, its children, and its >> grandchildren. The root gets expanded, so the children are visible, >> but the grandchildren are present, so the children are expandable. A >> callback is set up to handle the TreeView's testExpandRow signal, >> indicating that the user has requested expansion of one of the nodes. >> I do this initial setup of the accounts window prior to calling >> mainGUI the first time. This all works fine. >> >> >> The trouble starts if I try to expand one of the root's children by >> clicking it. The root's grandchildren are already present, but >> callback attached to the testExpandRow needs to add the grandchildren >> of the clicked node, so that if it has children, it will appear >> expandable. The callback receives both an iter and a path to the >> clicked node. It uses the path in a loop that adds the grandchildren >> of the clicked node to the TreeStore. This succeeds, but when the >> callback returns, I get an error message: >> >> >> ** (Newcash:920): CRITICAL **: gtk2hs_store_iter_has_child: assertion >> 'iter->stamp == store->stamp' failed >> >> and the display fails to refresh, with the clicked node expanded. If I >> click the same node again, it expands correctly (the grandchildren are >> already present, courtesy of the response to the previous click). >> >> I'm guessing that the iter being passed to the callback (which I don't >> use; as mentioned before, the insertion of the grandchildren is done >> using the path derived from the path of the clicked node, using >> treeStoreInsert) has a time-stamp as of the time the first >> testExpandRow signal was issued. In response to that signal, I add >> some nodes to the store. I'm guessing that doing so updates the >> time-stamp on the store and that the two time-stamps are compared upon >> return from signal processing, and they are no longer equal. The >> second click does nothing to the store (my callback is smart enough to >> know that a node has already been processed and doesn't add its >> grandchildren twice), so the second time the node is clicked, the >> time-stamp comparison works. >> >> ------------------------------------------------------------------------------ >> CenturyLink Cloud: The Leader in Enterprise Cloud Services. >> Learn Why More Businesses Are Choosing CenturyLink Cloud For >> Critical Workloads, Development Environments & Everything In Between. >> Get a Quote or Start a Free Trial Today. >> http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk >> _______________________________________________ >> Gtk2hs-devel mailing list >> Gtk2hs-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/gtk2hs-devel > > ------------------------------------------------------------------------------ > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > Learn Why More Businesses Are Choosing CenturyLink Cloud For > Critical Workloads, Development Environments & Everything In Between. > Get a Quote or Start a Free Trial Today. > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > _______________________________________________ > Gtk2hs-devel mailing list > Gtk2hs-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gtk2hs-devel ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. 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