RE: Appended row not being displayed

["Erik Ohrnberger" <Erik echohome org>]

On Wed, July 12, 2006 11:54, Erik Ohrnberger wrote:
> On Wed, July 12, 2006 11:20, Erik Ohrnberger wrote:
>> On Tue, July 11, 2006 13:15, Murray Cumming wrote:
>> <snip>
>>> Are you using a custom treemodel, or are you adding the rows
>>> during some intensive processing that would stop the UI from
>>> updating?
>> <snip>
>>
>> I'm using a standard treemodel with application code populating the
>> columns in the rows, and yes, this is during some pretty intensive
>> processing.  Approx. 6 rows are being added each second, with a possible
>> maximum of 100,000 rows in the treemodel that need to be displayed and
>> scrolled by the user.
>>
>> The TreeView is rendering the content of a virtual memory mapped region
>> that is serving as a circular log of events.  The events are what are
>> being logged to this memory religion at approx. 6 rows per second.  Each
>> of these entries in the region is 176 bytes in length, but is
>> represented
>> as a row in the treeview that includes a unsigned long time stamp for
>> sorting, an icon, a time stamp string, a 3-4 character address, and a
>> 150
>> byte message.
>>
>> It makes me wonder if I can relieve some of the contention by threading
>> the GUI update part of the code.  Is this a good idea?  Would it have
>> the
>> desired effect of keeping the GUI updated in a more timely fashion?
>>
>
> I thought I found what I was looking for in a suggestion that was
> submitted to the list for what appears to be a similar problem
> (http://marc.theaimsgroup.com/?l=gtkmm&m=112928461625469&w=2), however,
> when I add the code:
>
> ////////////////////////////////////////////////////////////////////
> // code that allows the UI to update
> while(Gtk::Main::instance()->events_pending())
> Gtk::Main::instance()->iteration();
> ///////////////////////////////////////////////////////////////////
>
> The application seems to hang and not exit when the user closes the main
> window.
>
Yea, I've tracked it down a bit more.  Seems that at some point, the
execution enters Gtk::Main::instance()->iteration(); but does not return,
reguardless if the blocking argument is set to false (to indicate
non-blocking).  Hmmm.  That's strange.  Buton the plus side, this is
exactly what I need to do.