[pygtk] PyGTK GUI update without signals from GUI

[Andrew Lapidas]

Sorry to flood the list, but I should add that I am using Glade to do this.

-Andy

On Tue, Apr 15, 2008 at 11:35 AM, Andrew Lapidas
<alapidas at student.umass.edu> wrote:
> Stephen, John:
>
>  Thank you for your replies so far.  I am still trying to figure out
>  the best way to do this.  To be more descriptive, I have a small
>  program (~400 lines) that controls a digital camera and does some
>  image processing in a scripting fashion.  This program will run
>  infinitely.  There are about 7 points in this program where I would
>  like to update my GUI.  If I implement threading, I will spawn just
>  one thread for this program.  I still am unsure of the best way to do
>  this.
>
>  Also, what is the GObject module and how does it differ from the pygtk module?
>
>  Thanks,
>  Andy
>
>
>
>  On Mon, Apr 14, 2008 at 7:04 PM, Stephen George
>  <steve_geo at optusnet.com.au> wrote:
>  > Hi Andrew,
>  >
>  >
>  >  Andrew Lapidas wrote:
>  >
>  > >  I am currently having a problem updating a GUI.
>  > >
>  > >  I am using PyGTK and Glade to design an interface for a project.  This
>  > >  interface contains no buttons, just images, labels, and a progress
>  > >  bar.  The code for the project is small, and it basically does some
>  > >  things independent of the GUI in an infinite loop.
>  > >
>  >  Regarding  'does some things'
>  >  Is this constant processing or periodic checking.
>  >  Periodic checking would be easier to do with timers
>  >
>  > http://www.pygtk.org/pygtk2tutorial/ch-TimeoutsIOAndIdleFunctions.html#sec-Timeouts
>  >
>  >  also have a read of
>  > http://www.pygtk.org/pygtk2tutorial/sec-IdleFunctions.html
>  >
>  >
>  >
>  >
>  > >  I need the project
>  > >  code to update the GUI intermittently.  I have found, though, that
>  > >  generally it seems that the gtk.main loop is looking for signals from
>  > >  the GUI and I cannot figure out how to give it signals from another
>  > >  application.
>  > >
>  >  Do you really want a separate application to talk to your GUI, means you
>  > will have to look at some sort of inter process communication.
>  >  sockets, or something more elaborate pyro http://pyro.sourceforge.net/
>  > I'm sure there is many others.
>  >
>  >
>  >
>  > >  I have thought spawning a new thread from the __init__
>  > >  in the GUI and somehow having it send signals to gtk.main, but I do
>  > >  not know if this will work.
>  > >
>  > >
>  >  Yes, .. you can set up your own 'signals' but I found it's not well
>  > documented in pyGTK manual
>  >  http://www.pygtk.org/pygtk2tutorial/ch-AdvancedEventAndSignalHandling.html
>  >
>  >  Instead I referred to gobject documentation from here
>  >
>  > http://www.sicem.biz/personal/lgs/docs/gobject-python/docs/gobject-python/gobject-tutorial.html
>  >  look at section 'creating your own signals'
>  >  but I'm sure there is many other gobject documentation around on net.
>  >
>  >  When emiting from a thread for any signal whose handler updates the GUI.,
>  > need to do it safely by adding the emit to the idle loop.
>  >  gobject.idle_add(self.emit, "cntlrFinaliseConnection")
>  >
>  >  Have a read, try an implementation, .. if you then get problems ask more
>  > questions
>  >
>  >  Steve
>  >
>  >
>  >
>  >
>  >
>  >  _______________________________________________
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>  >  Read the PyGTK FAQ: http://www.async.com.br/faq/pygtk/
>  >
>
>
>
>  --
>  Andrew Lapidas
>  email / alapidas at student.umass.edu
>  phone / 774.279.4740
>



-- 
Andrew Lapidas
email / alapidas at student.umass.edu
phone / 774.279.4740