Re: ListStore iteration

["Jonathon Jongsma" <jonathon jongsma gmail com>]

On 10/6/06, Amadeus W. M. <amadeus84 verizon net> wrote:
> On Thu, 05 Oct 2006 23:12:02 -0500, Paul Davis wrote:
>
> > Amadeus,
> >
> > You're not allowing the update function to be run.  You change the selection
> > which causes the image to be loaded and put into the pixbuf for display, but
> > you don't return and let gtk iterate through the event loop and redraw the
> > image.
> >
> > The first way to accomplish this that comes to mind is to register an
> > on_idle function.  Then you use a timeout that updates the selection.
> >
> > Something like this:
> >
> > bool MainWindow::on_idle()
> > {
> >    if( _iterating )
> >    {
> >       if( enough_time_has_passed() )
> >       {
> >            _row_iter++ ;
> >            _selection->select( row_iter ) ;
> >        }
> >     }
> >
> >    return true ;
> > }
> >
> > And connect it like so:
> >
> > Glib::signal_idle().connect( sigc::mem_fun( *main_window_ptr,
> > &MainWindow::on_idle ) ) ;
> >
> > And then your button handler:
> >
> > void
> > MainWindow::on_SaveAllButton_clicked()
> > {
> >       _selection = ItemSelector->get_selection() ;
> >       _row_iter = _selection->children()->begin() ;
> >      _iterating = true ;
> >      _selection->select( _row_iter ) ;
> >      init_enough_time_passed_function() ;
> > }
> >
> > Paul
> >
>
>
> So the idea is to have each iteration triggered by some sort of timer,
> right? A simple sleep() won't do (because I tried that). Except that
> unlike a timeout, with an on_idle() function, the update happens as
> quickly as possible. As in Chapter 17 in the book.
>
> What exactly is the enought_time_has_passed() function. Sorry, I'm a
> little tired myself.

how bout Glib::SignalTimeout?
http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/classGlib_1_1SignalTimeout.html

--
jonner