Re: [pygtk] get the XID from gtk.Drawingarea

[Rafael Villar Burke]

Holger Reinmann wrote:
Hello,
 

When I try to get the XID from the gtk.drawingarea with da.window.xid I
get an Errormsg "None Type Object has no attribute XID"
greetings holger
Sorry, the example showed the XID for the window were the button is 
being painted, and that is its parent's window (the main window on this 
occasion), as gtk.Buttons don't own an X window for themselves.

With some changes the example at the end should work now as expected.
Anyway, remind that the window for which you want to know the XID must 
have been realized (if it's exposed you know that happens for sure). If 
you want to do this in a class that inherits from gtk.DrawingArea that 
means you should get the XID inside an on_expose_event(...) callback 
method connected to the configure event for the gtk.DrawingArea. 
Possibly you can do that too earlier (not sure about this) inside a 
similar on_realize (for the realize event) chaining up the event before 
getting the window, just for the case it runs before the parent class' 
method runs.

Fleshed out, this last idea would be coded as something like this:
<example 1>
"""Print a widget's XID when the widget is a class inherited from 
another gtk widget."""

import pygtk
pygtk.require('2.0')
import gtk
def show_widget_xid_datum(sender, widget):
  sender.set_label("X window ID: %s" % (widget.the_xid_you_want,))
class GraphArea(gtk.DrawingArea):
   def __init__(self):
      gtk.DrawingArea.__init__(self)
      self.connect('expose-event', self.on_expose_event)
   def on_expose_event(self, widget, event):
      self.the_xid_you_want = widget.window.xid
      return False
window = gtk.Window()
vbox = gtk.VBox()
ga = GraphArea()
ga.set_size_request(200,100)
button = gtk.Button("Press me")
button.connect("clicked", show_widget_xid_datum, ga)
vbox.pack_start(button)
vbox.pack_start(ga)
window.add(vbox)
window.set_title("GraphArea XID example")
window.connect("destroy", gtk.mainquit)
window.show_all()
gtk.main()
<\example 1>
And here is the first example, corrected:
<example 2>
"""Print a widget's XID"""
import pygtk
pygtk.require('2.0')
import gtk
def show_widget_xid(sender, widget):
  sender.set_label("X window ID: %s" % (widget.window.xid,))
window = gtk.Window()
vbox = gtk.VBox()
da = gtk.DrawingArea()
da.set_size_request(200,100)
button = gtk.Button("Press me")
button.connect("clicked", show_widget_xid, da)
vbox.pack_start(button)
vbox.pack_start(da)
window.add(vbox)
window.set_title("DrawingArea example")
window.connect("destroy", gtk.mainquit)
window.show_all()
gtk.main()
Take care,
Pachi
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