hi!
According to this source
http://www.pygtk.org/pygtk2tutorial/sec-ComboBoxAndComboboxEntry.html
there is a performance limitation for the set_wrap_width method of the
combobox widget:
>With a large number of items, say more than 50, the use of the
>set_wrap_width() method will have poor performance because of the
>computation for the grid layout. To get a feel for the affect modify the
>comboboxwrap.py<http://www.pygtk.org/pygtk2tutorial/examples/comboboxwrap.py>program
> line 18 to display 150 items.
Is there any workaround about this?
Shouldn't it be reported to gtk-developers as a bug? A dialog with 8 such
combobox's with ~50 items each becomes unacceptably slow to load.
Kind Regards
Kostas
import gtk
class test_combo_box:
# =======================================================
def __init__(self):
self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
self.window.set_size_request(200,100)
self.window.connect('delete_event', self.close_application)
self.mycombo = gtk.ComboBox()
context = [str(i) for i in range(150)]
# context[1] = '-'
self.set_model_from_list(self.mycombo, context, 10, 7)
self.mycombo.set_row_separator_func(lambda model,i: model[i][1])
self.window.add(self.mycombo)
self.window.show_all()
# =======================================================
def set_model_from_list (self, combo, items, row_no=None, wrap_width_max=1):
"""Creates a model from a list of strings and connects it to a combobox"""
model = gtk.ListStore(str,bool,int)
combo_list = [[]]
for i in items:
if i is '-': #separator line
if combo_list[-1] == []:
del combo_list[-1]
combo_list.append(['-'])
else:
if combo_list[-1] == ['-']:
combo_list.append([])
combo_list[-1].append(i)
max_grp_size = max([len(elm) for elm in combo_list])
if not row_no:
row_no = max_grp_size
col_no = min( 1 + (max_grp_size - 1) / row_no, wrap_width_max)
cnt_list = []
for grp in combo_list:
grp_size = len(grp)
wrap_height = max(row_no, 1 + (grp_size-1) / col_no)
wrap_height = min(wrap_height, grp_size)
for i in range(wrap_height):
cnt = 0
for elm in grp[i::wrap_height]:
model.append([elm, False, 1])
if elm is '-': #separator line
model[-1][1] = True
cnt += 1
cnt_list.append(cnt)
model[-1][2] = col_no - cnt + 1
combo.set_model(model)
cell = gtk.CellRendererText()
combo.pack_start(cell, True)
combo.add_attribute(cell, 'text', 0)
combo.set_column_span_column(2)
combo.set_wrap_width(col_no)
# =======================================================
def close_application(self, widget, event=None, data=None):
"""Termination"""
if gtk.main_level():
gtk.main_quit()
else:
sys.exit(0)
return False
if __name__ == '__main__':
test_combo_box()
gtk.main()
_______________________________________________
pygtk mailing list [email protected]
http://www.daa.com.au/mailman/listinfo/pygtk
Read the PyGTK FAQ: http://faq.pygtk.org/
