Re: [pygtk] Compiling PyGTK2

[Ava Arachne Jarvis]

[Thomas Leonard - Tue, 21 Jan 2003 05:10:56 AM CST]
 Actually, it might be a PyGTK problem. Looks like the infamous
 ref-counting bug (this object is only referenced by signal handlers, so
 I'm going to wipe __dict__):
 
   http://bugzilla.gnome.org/show_bug.cgi?id=92955

I feel silly now.  I was looking for pygtk/python-gtk in Gnome's
bugzilla page, but not gnome-python, so never found pygtk's list of
official bugs, so bothered you all earlier.   And neglected to read
James' GNOME page.  Bah.  The one link I didn't click.


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Re: [pygtk] instance.__dict__ disappears with many widgets

[Ava Arachne Jarvis]

[John Finlay - Wed, 15 Jan 2003 03:03:46 PM CST]
 I'm guessing that your ColorWidgets are somehow losing info because of 
 loss of references in python but I don't understand how PyGTK handles 
 memory in conjunction with python.

That would definitely cause it

I'm guessing that reference counting or something goes boinkers.


 I fiddled with your test program and added a list of ColorWdigets to the 
 StyleBox instance - this seemed to fix things but I don't know exactly 
 why. It's a hack but may be a workaround.

Thanks for the workaround.  I did modify the full program to put every
user-derived widget class into a list held by the main app window, and
everything works again.


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[pygtk] instance.__dict__ disappears with many widgets

[Ava Arachne Jarvis]

I'm using python 2.2 and pygtk 1.99.14, gtk 2.2.0 and friends.

I'm running across an odd problem when I use a large number of widgets,
and some of them are ones that inherit from original gtk widgets.   When
first created, these objects seem intact; however, the first time a
signal callback is called, the objects' attribute dictionaries are
empty.

I'm attaching a version of the program that I stripped down to about 50
lines.  Instruction for running this:

  python stripped.py num of ColorWidgets

Basically, this program makes a bunch of notebook pages, each with a
button that lets you set its color (the notebook tabs are hidden so that
the thing isn't huge).  The clicked signal callback prints out the
object's attribute dictionary and then attempts to set the color via
calling the dialog, which belongs to the main window.

Compare 'python stripped.py 10' versus 'python stripped.py 80'.  80
color buttons is an extravagant amount, but 80 widgets of various types
is not so extravagant.

I'm definitely not running out of memory; nor am I using threads in my
own code.

I've searched the PyGTK FAQ for 'many widgets', 'inheritance',
'subclass', and 'ExtensionClass' (from browsing search results from the
mailing list) but I didn't find an answer.

Is this a known problem, and is there a workaround?  Or am I just doing
something wrong?  Thanks.


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Re: [pygtk] instance.__dict__ disappears with many widgets

[Ava Arachne Jarvis]

[Ava Arachne Jarvis - Wed, 15 Jan 2003 05:25:54 AM CST]
 I'm attaching a version of the program that I stripped down to about 50
 lines.  Instruction for running this:

It would help if I attached the program. Heh.  Sorry.


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|
| UPS interrupted the server's power

#!/usr/bin/python
import pygtk
pygtk.require('2.0')
import gtk, sys, string

class ColorWidget(gtk.Button):
def __init__(self, stylebox):
gtk.Button.__init__(self)
self.stylebox = stylebox
self.color = gtk.gdk.color_parse('white')
self.set_size_request(30, 30)
self.connect(clicked, self.setColor)

def setBackground(self, gdkcolor = None):
if gdkcolor: 
self.color = gdkcolor
for state in [gtk.STATE_ACTIVE, gtk.STATE_NORMAL, 
  gtk.STATE_PRELIGHT, gtk.STATE_SELECTED]: 
self.modify_bg(state, self.color)

def setColor(self, w):
print '__dict__:', self.__dict__
self.setBackground(self.stylebox.getColor(self.color))

class StyleBox(gtk.Window):
def __init__(self, numwidgets = 10):
gtk.Window.__init__(self)
self.connect(destroy, lambda w: gtk.main_quit())

self.cdg = gtk.ColorSelectionDialog('Select Color')
self.notebook = gtk.Notebook()
self.notebook.set_show_tabs(0)
self.add(self.notebook)

for i in range(0, numwidgets): 
self.createTestPanel()

def getColor(self, prev_color = None):
if prev_color: self.cdg.colorsel.set_current_color(prev_color)
color = None
if self.cdg.run() == gtk.RESPONSE_OK:
color = self.cdg.colorsel.get_current_color()
self.cdg.hide()
return color

def createTestPanel(self):
panel = gtk.Frame()
self.notebook.append_page(panel, gtk.Label('Test'))
panel.add(ColorWidget(self))

s = StyleBox(string.atoi(sys.argv[1]))
s.show_all()
gtk.main()