I have a Gtk.Treeview which shows rows with items. I want to select lines with button 1 (default behaviour), and, on clicking with button 3 (right), a context menu should appear. Here are the results I get:
1 - Using connect to connect to the button-press-event, works fine, but, as this handler is called before the default (treeview) handler, the line selection was not changed yet, and reading the selected row gives the previously selected line.
2 - Use connect-after to connect to the button-press-event. But now my handler is not called anymore... As if the internal handler exits with return True. Strangely, double-clicking does call to my handler.
How can I have button-3 change the selection first, then call my handler?
Here's a short version of the program, uncomment one of the marked lines to test 1 or 2.
BTW: I thought maybe set_activate_on_single_click might help - no luck.
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# test_keypress.py
#
# Copyright 2021 John Coppens <john@jcoppens.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
#
import gi
gi.require_version('Gtk', '3.0')
gi.require_version('GooCanvas', '2.0')
from gi.repository import Gtk, GooCanvas
class MainWindow(Gtk.Window):
def __init__(self):
super(MainWindow, self).__init__()
self.connect("destroy", lambda x: Gtk.main_quit())
self.set_default_size(400, 300)
store = Gtk.ListStore(str)
view = Gtk.TreeView(model = store)
view.connect('button-press-event', self.on_button_pressed) # Select one of these
# view.connect_after('button-press-event', self.on_button_pressed) # ....
renderer = Gtk.CellRendererText()
col = Gtk.TreeViewColumn('Column', renderer, text = 0)
view.append_column(col)
store.append(('Alpha', ))
store.append(('Beta', ))
store.append(('Gamma', ))
scroller = Gtk.ScrolledWindow()
scroller.add(view)
self.add(scroller)
self.show_all()
def on_button_pressed(self, view, event):
sel = view.get_selection()
store, selected = sel.get_selected()
item = store[selected]
print(event.button, item[0])
def run(self):
Gtk.main()
def main(args):
mainwdw = MainWindow()
mainwdw.run()
return 0
if __name__ == '__main__':
import sys
sys.exit(main(sys.argv))
Thanks @theGtknerd - I've noticed this method being used in several programs, but somehow it doesn't feel entirely right. I like things to happen when I take action, not when I finish it.
Anyway, thanks to a suggestion of @Company on IRC, I solved the issue like this (and the code length is about the same):
x, y coordinates from the button-press-event it's easy to identify the correct row in the Gtk.TreeView. After processing the event, I let the default handler change the selection. The code is something like: def on_button_pressed(self, view, event):
path, _, _, _ = view.get_path_at_pos(int(event.x), int(event.y))
if path:
item = self.store[self.store.get_iter(path)]
print(event.button, item[0])
(not sure the int()s are necessary, but get_path_at_pos specifies int arguments.
The _s are dummy variables, 'cause get_path_at_pos returns a 4-tuple and I only need the first element.