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# -*- coding: utf-8 -*-
# signaltracker.py
# Copyright (C) 2013 LEAP
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
import logging
from PySide import QtCore
logger = logging.getLogger(__name__)
class SignalTracker(QtCore.QObject):
"""
A class meant to be inherited from that helps to do the Qt connect and keep
track of the connections made, allowing to disconnect those tracked signals
as well.
"""
def __init__(self):
# this list contains the connected signals that we want to keep track.
# each item of the list is a:
# tuple of (Qt signal, callable or Qt slot or Qt signal)
self._connected_signals = []
def connect_and_track(self, signal, method):
"""
Connect the signal and keep track of it.
:param signal: the signal to connect to.
:type signal: QtCore.Signal
:param method: the method to call when the signal is triggered.
:type method: callable, Slot or Signal
"""
if (signal, method) in self._connected_signals:
logger.warning("Signal already connected.")
return
self._connected_signals.append((signal, method))
signal.connect(method)
def disconnect_and_untrack(self):
"""
Disconnect all the tracked signals.
"""
for signal, method in self._connected_signals:
try:
signal.disconnect(method)
except (TypeError, RuntimeError) as e:
# most likely the signal was not connected
logger.warning("Disconnect error: {0!r}".format(e))
logger.warning("Signal: {0!r} -> {1!r}".format(signal, method))
self._connected_signals = []
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