[FOSS-GPS] Re: Download-progress callbacks in osm-gps-map (was: FoxtrotGPS paint-optimize branch)

[John Stowers]

On Sat, 2010-05-15 at 16:33 -0400, Joshua Judson Rosen wrote:
> Sander van Grieken <sander at 3v8.net> writes:
> > On Friday 14 May 2010 14:04:34 John Stowers wrote:
> > > Sander van Grieken <sander at 3v8.net> writes:
> > > >
> > > > - There seems to be no callback for download-progress-reporting
> > > > (number of threads, queue depth). I'd hate to ditch the visual
> > > > download feedback foxtrot currently has.
> > > 
> > > No callbacks is by design, the number of queued tiles is exposed as a
> > > gobject property (tiles-queued). It can be polled at whatever frequency
> > > the UI wishes (see python demo for example).
> > 
> > Well I actually meant signals instead of callbacks, but fair enough,
> > this should suffice.  Is it also possible to inspect currently
> > running download threads, and is there a way to cancel the queue?
> 
> Actually, shouldn't it be possible to listen for a "notify::tiles-queued"
> GObject signal?
> 

Possibly, I am not sure if I call g_object_set() with the tile value
internally (as this triggers the signal emission) or just update the
value of the private instance variable directly.

I suspect I do the former. If this is a problem then I could change to
ensure that I set the property through the GObject machinery.

John