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author | Jesús Eduardo <heckyel@hyperbola.info> | 2017-05-31 18:08:31 -0500 |
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committer | Jesús Eduardo <heckyel@hyperbola.info> | 2017-05-31 18:08:31 -0500 |
commit | e1180428ed3e7634fe1596103511fbb1da05f228 (patch) | |
tree | 13de9592bcde7050b089b9644839668024c518b3 /mvc/widgets/gtk/weakconnect.py | |
download | librevideoconverter-e1180428ed3e7634fe1596103511fbb1da05f228.tar.lz librevideoconverter-e1180428ed3e7634fe1596103511fbb1da05f228.tar.xz librevideoconverter-e1180428ed3e7634fe1596103511fbb1da05f228.zip |
first commit
Diffstat (limited to 'mvc/widgets/gtk/weakconnect.py')
-rw-r--r-- | mvc/widgets/gtk/weakconnect.py | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/mvc/widgets/gtk/weakconnect.py b/mvc/widgets/gtk/weakconnect.py new file mode 100644 index 0000000..b8b9526 --- /dev/null +++ b/mvc/widgets/gtk/weakconnect.py @@ -0,0 +1,56 @@ +# @Base: Miro - an RSS based video player application +# Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 +# Participatory Culture Foundation +# +# 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 St, Fifth Floor, Boston, MA 02110-1301 USA +# +# In addition, as a special exception, the copyright holders give +# permission to link the code of portions of this program with the OpenSSL +# library. +# +# You must obey the GNU General Public License in all respects for all of +# the code used other than OpenSSL. If you modify file(s) with this +# exception, you may extend this exception to your version of the file(s), +# but you are not obligated to do so. If you do not wish to do so, delete +# this exception statement from your version. If you delete this exception +# statement from all source files in the program, then also delete it here. + +"""weakconnect.py -- Connect to a signal of a GObject using a weak method +reference. This means that this connection will not keep the object alive. +This is a good thing because it prevents circular references between wrapper +widgets and the wrapped GTK widget. +""" + +from mvc import signals + +class WeakSignalHandler(object): + def __init__(self, method): + self.method = signals.WeakMethodReference(method) + + def connect(self, obj, signal, *user_args): + self.user_args = user_args + self.signal_handle = obj.connect(signal, self.handle_callback) + return self.signal_handle + + def handle_callback(self, obj, *args): + real_method = self.method() + if real_method is not None: + return real_method(obj, *(args + self.user_args)) + else: + obj.disconnect(self.signal_handle) + +def weak_connect(gobject, signal, method, *user_args): + handler = WeakSignalHandler(method) + return handler.connect(gobject, signal, *user_args) |