92 lines
2.7 KiB
Python
92 lines
2.7 KiB
Python
# Copyright 2014 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# qutebrowser is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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"""Utilities regarding signals."""
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import re
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import logging
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from collections import OrderedDict
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from PyQt5.QtCore import QObject
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def signal_name(sig):
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"""Return a cleaned up name of a signal."""
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m = re.match(r'[0-9]+(.*)\(.*\)', sig.signal)
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return m.group(1)
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def dbg_signal(sig, args):
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"""Return a string representation of a signal for debugging.
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sig -- A pyqtSignal.
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args -- The arguments as list of strings.
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"""
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return '{}({})'.format(signal_name(sig), ', '.join(map(str, args)))
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class SignalCache(QObject):
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"""Cache signals emitted by an object, and re-emit them later."""
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uncached = None
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signal_dict = None
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def __init__(self, uncached=None):
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"""Create a new SignalCache.
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uncached -- A list of signal names (as string) which should never be
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cached.
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"""
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super().__init__()
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if uncached is None:
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self.uncached = []
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else:
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self.uncached = uncached
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self.signal_dict = OrderedDict()
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def add(self, sig, args):
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"""Add a new signal to the signal cache.
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If the signal doesn't need caching it will be ignored.
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If it's already in the cache, it'll be updated and moved to the front.
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If not, it will be added.
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"""
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if not self._signal_needs_caching(sig):
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return
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had_signal = sig.signal in self.signal_dict
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self.signal_dict[sig.signal] = (sig, args)
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if had_signal:
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self.signal_dict.move_to_end(sig.signal)
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def clear(self):
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"""Clear/purge the signal cache."""
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self.signal_dict.clear()
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def replay(self):
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"""Replay all cached signals."""
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for (signal, args) in self.signal_dict.values():
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logging.debug('emitting {}'.format(dbg_signal(signal, args)))
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signal.emit(*args)
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def _signal_needs_caching(self, signal):
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"""Return True if a signal should be cached, false otherwise."""
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return not signal_name(signal) in self.uncached
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