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# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
# Copyright 2014-2021 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
#
# This file is part of qutebrowser.
#
# qutebrowser 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.
#
# qutebrowser 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 qutebrowser. If not, see <https://www.gnu.org/licenses/>.
"""A filter for signals which either filters or passes them."""
import functools
from PyQt5.QtCore import QObject
from qutebrowser.utils import debug, log, objreg
class SignalFilter(QObject):
"""A filter for signals.
Signals are only passed to the parent TabbedBrowser if they originated in
the currently shown widget.
Attributes:
_win_id: The window ID this SignalFilter is associated with.
Class attributes:
BLACKLIST: List of signal names which should not be logged.
"""
BLACKLIST = {'cur_scroll_perc_changed', 'cur_progress', 'cur_link_hovered'}
def __init__(self, win_id, parent=None):
super().__init__(parent)
self._win_id = win_id
def create(self, signal, tab):
"""Factory for partial _filter_signals functions.
Args:
signal: The pyqtBoundSignal to filter.
tab: The WebView to create filters for.
Return:
A partial function calling _filter_signals with a signal.
"""
log_signal = debug.signal_name(signal) not in self.BLACKLIST
return functools.partial(
self._filter_signals, signal=signal,
log_signal=log_signal, tab=tab)
def _filter_signals(self, *args, signal, log_signal, tab):
"""Filter signals and trigger TabbedBrowser signals if needed.
Triggers signal if the original signal was sent from the _current_ tab
and not from any other one.
The original signal does not matter, since we get the new signal and
all args.
Args:
signal: The signal to emit if the sender was the current widget.
tab: The WebView which the filter belongs to.
*args: The args to pass to the signal.
"""
tabbed_browser = objreg.get('tabbed-browser', scope='window',
window=self._win_id)
try:
tabidx = tabbed_browser.widget.indexOf(tab)
except RuntimeError:
# The tab has been deleted already
return
if tabidx == tabbed_browser.widget.currentIndex():
if log_signal:
log.signals.debug("emitting: {} (tab {})".format(
debug.dbg_signal(signal, args), tabidx))
signal.emit(*args)
else:
# pylint: disable=else-if-used
if log_signal:
log.signals.debug("ignoring: {} (tab {})".format(
debug.dbg_signal(signal, args), tabidx))
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