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# SPDX-FileCopyrightText: Florian Bruhin (The Compiler) <mail@qutebrowser.org>
#
# SPDX-License-Identifier: GPL-3.0-or-later
"""A filter for signals which either filters or passes them."""
import functools
from qutebrowser.qt.core 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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