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Diffstat (limited to 'src/leap/bitmask/gui/signaltracker.py')
-rw-r--r-- | src/leap/bitmask/gui/signaltracker.py | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/leap/bitmask/gui/signaltracker.py b/src/leap/bitmask/gui/signaltracker.py new file mode 100644 index 00000000..c83359c4 --- /dev/null +++ b/src/leap/bitmask/gui/signaltracker.py @@ -0,0 +1,64 @@ +# -*- 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 = [] |