[ruby-talk:03001] FYI: Re: Python, Glade, & GTK

This comp.lang.python post might be of some interest to those working on
or with Ruby/GTK. (Original had HTML; trying to send text only.)

Mitch Chapman wrote:

> Mafee wrote:
> > Can anyone give me some clues of linking python code to a GUI interface
> > generate by Glade or GTK or whatever please?
>
> Here's an example.  Two files are attached.
>
> GladeBase.py provides two base classes.  Class UI creates a widget
> hierarchy from a Glade file.  Class Controller provides an
> MVC-style controller for the UI.  The main() function of the module
> shows how to use these base classes to build and control a GUI.
>
> ui.glade is a simple user interface created using Glade.  If you
> plop it into the same directory with GladeBase.py and then run
> GladeBase.py, you should get an application window on your display.
>
> The cool part about James Henstridge's libglade, on which this example
> is based, is the way it wires up callback routines.  You pass it
> a dictionary of callable objects, keyed by name.  It roots
> through the Glade-based user interface hierarchy, and for every
> connected signal declared in the interface, it looks for a callable
> of the same name in the callback dictionary.  If it finds one,
> it plugs it in.  It's cheap and easy.
>
> In the example, Controller._connectToUI() assumes that you will
> derive from class Controller and define all of the callback methods
> in the derived class.
>
> Hoping this helps...
>
> --
> Mitch Chapman
> [e-mail]
>
>    ----------------------------------------------------------------
> #!/usr/bin/env python
> """This is an example of accessing Glade-built UIs from Python."""
> import gnome.ui, gtk, libglade
>
> class UI(libglade.GladeXML):
>     """Base class for all UIs loaded from glade."""
>     def __init__(self, filename, rootname):
>         """Initialize a new instance."""
>         libglade.GladeXML.__init__(self, filename=filename, root=rootname)
>         self.root = self.get_widget(rootname)
>
>     def show(self):
>         """Make the UI visible."""
>         self.root.show()
>
> class Controller:
>     """Base class for all controllers of glade-derived UIs."""
>     def __init__(self, ui):
>         """Initialize a new instance.  `ui' is the GladeXML UI to control."""
>         self.ui = ui
>         self._connectToUI()
>
>     def _connectToUI(self):
>         """Wire up self to its UI.
>
>         This method assumes that any method defined by self's class
>         could be a Gtk+ callback.  It wires up any methods referenced by
>         self's ui."""
>         names = dir(self.__class__)
>         d = {}
>         for name in names:
>             d[name] = getattr(self, name)
>
>         self.ui.signal_autoconnect(d)
>
>     def show(self):
>         """Show the user interface."""
>         self.ui.show()
>
> def main():
>     """Module mainline (for standalone execution)"""
>     class SampleController(Controller):
>         def on_pushBtn_clicked(self, *args):
>             """Called when the 'push me' button is clicked."""
>             print "Thanks for pushing me."
>             gtk.mainquit()
>
>         def on_win_delete_event(self, *args):
>             """Called when the window is deleted."""
>             gtk.mainquit()
>
>     theUI = UI("ui.glade", "win")
>     theController = SampleController(theUI)
>     theController.show()
>     gtk.mainloop()
>
> if __name__ == "__main__":
>     main()
>
>    ----------------------------------------------------------------
> CreateWorkspacecreate_workspacesrcpixmapsCTrueTrueGtkWindowwindelete_eventon_win_delete_eventWed,
> 03 May 2000 00:16:13
> GMTGTK_WINDOW_TOPLEVELGTK_WIN_POS_NONEFalseFalseTrueFalseGtkVBoxvbox1False0GtkLabellabel1Go
> on, push the
> button.GTK_JUSTIFY_CENTERFalse0.50.5000FalseFalseGtkButtonpushBtnTrueclickedon_pushBtn_clickedMon,
> 22 May 2000 15:28:00 GMTPush Me0FalseFalse

--
Conrad Schneiker
(This note is unofficial and subject to improvement without notice.)