Hi,
I'm writing a set of examples for basic use of TreeView widget for
those who only need to manage lists (and not trees). Here in the
following there is an example wich shows a cryptic behaviour: a
list of items is shown (names, surnames) and when you click the button
name and surname should swap; the strange thing is about the update of
the view that is executed in a further moment, only when you force it
(window resize, mouse pointer over the list items, click in the list, etc.).
Why the update is delayed? How can I solve the problem in the Right
Way (TM)? (there are some dirty hacks, but they are not good to
show in an example)
Thanks in advance,
Emanuele
-----
example2.2.py
-----
import gtk
class Person(object):
"""A simple class"""
def __init__(self, name="unknown", surname="unknown"):
self.name=name
self.surname=surname
def getname(treeview, cell, model, row):
"""Get name from the selected item of the list"""
name=model.get_value(row,0).name
cell.set_property("text", name)
return
def getsurname(treeview, cell, model, row):
"""Get surnname from the selected item of the list"""
surname=model.get_value(row,0).surname
cell.set_property("text", surname)
return
def action(*args):
"""Action to perform when an item of the list is selected"""
model, row = view.get_selection().get_selected()
print model.get_value(row,0).name, model.get_value(row,0).surname
def change(button, people):
"""Swap name and surname of all people"""
for i in people:
tmp=i.name
i.name=i.surname
i.surname=tmp
if __name__=='__main__':
# some data to fill the listview
people=[Person("Emanuele","Olivetti"),Person("Laura","Gatti"),Person("Richard","Stallman")]
# define a model with with only 1 column (object)
model = gtk.ListStore(object)
# fill the model with the people
for i in people:
row=model.append()
model.set_value(row, 0, i)
# create a view based on the model
view = gtk.TreeView(model)
# create a text renderer to render the text
renderer = gtk.CellRendererText()
# create two columns based on name/surname data
column0 = gtk.TreeViewColumn("Name", renderer)
column0.set_cell_data_func(renderer, getname)
column1 = gtk.TreeViewColumn("Surname", renderer)
column1.set_cell_data_func(renderer, getsurname)
# append column to the view
view.append_column(column0)
view.append_column(column1)
# connect the signal "cursor-changed" to 'action' function
view.connect('cursor-changed',action)
# ListView ends here. Adding horizontal and vertical scroll bars
sw=gtk.ScrolledWindow()
sw.set_policy(gtk.POLICY_AUTOMATIC,gtk.POLICY_AUTOMATIC)
sw.add(view)
# Preparing a new button:
b=gtk.Button()
b.set_label("change!")
b.connect("clicked",change,people)
# putting everything in horizontal box to add a button
hb=gtk.HBox()
hb.add(sw)
hb.add(b)
# Now we need a window to insert everything...
# create a window, insert the view, associate the 'mainquit' function
# to the "destroy" signal and show all
win = gtk.Window(gtk.WINDOW_TOPLEVEL)
win.add(hb)
win.connect("destroy", gtk.mainquit)
win.show_all()
# go...
gtk.main()
----
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