Re: gtk embedding.

Quoth Bruce Sherwood on Fri, Jun 08, 2012 at 07:52:34 -0600
> The Linux version of VPython is based on GTK. 

Ah, then there maybe some hope.  I am running on Linux. 

What I want to do is to embed a VPython window within a bigger GTK GUI.
What I'd thought I'd do was create a gtk.Socket() and use that to embed
the VPython window.  This works like a charm provided that the VPython
window and the GUI window are created by different processes.  The
problem happens when I try to use threads -- yes, I know "I had a
problem. Then I used threading. Now Iav he wto pbleroms." ...

Still, I feel I am very close to it working.  In the code below, I get:
  test_opengl.py:62: GtkWarning: gtksocket.c:886: Can't add non-GtkPlug to GtkSocket socket.add_id(long(self.OpenGLWindowID))
  /usr/bin/ipython:62: GtkWarning: IA__gdk_error_trap_pop: assertion `gdk_error_traps != NULL' failed
as an error.  But if the code in GTKWindowThreadClass.run() is copied and
pasted into its own script (with the correct value of OpenGLWindowID as given
by xwininfo) then it works: the VPython window embeds into the GTK one. 

Can anyone see what I am doing wrong? 

Source code follows -- apologies for the spare commenting but it should
be simple enough to follow. 


================================================================================
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import time
from visual import *
import threading
import Queue
import gtk
import pygtk
import re
import subprocess


class OPenGLThreadClass (threading.Thread):
    """Thread running the VPython code."""

    def __init__(self, queue):
        threading.Thread.__init__(self)
        self.queue = queue
        self.name = 'OpenGLThread'


    def run (self):
        self.scene = display.get_selected() 
        self.scene.title = 'OpenGL test'
        s = sphere()
        self.queue.put(self.find_window_id())
        self.queue.task_done()


    def find_window_id (self):
        """Gets the OpenGL window ID."""
        pattern = re.compile('0x[0-9abcdef]{7}')
        P = subprocess.Popen(['xwininfo', '-name', self.scene.title],
                stdout=subprocess.PIPE)
        for line in P.stdout.readlines():
            match = pattern.findall(line)
            if len(match):
                ret = long(match[0], 16)
                print("OpenGL window id is %d (%s)" % (ret, hex(ret)))
                return ret


class GTKWindowThreadClass (threading.Thread):
    """Thread running the GTK code."""

    def __init__ (self, winID):
        threading.Thread.__init__(self)
        self.OpenGLWindowID = winID
        self.name = 'GTKThread'


    def run (self):
        """Draw the GTK GUI."""
        gtk.threads_enter()
        window = gtk.Window()
        window.show()
        socket = gtk.Socket()
        socket.show()
        window.add(socket)
        window.connect("destroy", lambda w: gtk.main_quit())
        print("Got winID as %d (%s)" % (self.OpenGLWindowID, hex(self.OpenGLWindowID)))
        socket.add_id(long(self.OpenGLWindowID))
        gtk.main()
        gtk.threads_leave()



def main ():
    thread = {}
    print("Embedding OpenGL/VPython into GTK GUI")
    queue = Queue.Queue()
    thread['OpenGL'] = OPenGLThreadClass(queue)
    thread['OpenGL'].start()
    winID = queue.get()
    print("Got winID as %d (%s)" % (winID, hex(winID)))
    gtk.gdk.threads_init()
    thread['GTK'] = GTKWindowThreadClass(winID)
    thread['GTK'].start()



if __name__ == "__main__":
    main()
================================================================================

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