terminator/terminatorlib/signalman.py

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# Terminator by Chris Jones <cmsj@tenshu.net>
# GPL v2 only
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"""Simple management of Gtk Widget signal handlers"""
from .util import dbg, err
class Signalman(object):
"""Class providing glib signal tracking and management"""
cnxids = None
def __init__(self):
"""Class initialiser"""
self.cnxids = {}
def __del__(self):
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"""Class destructor. This is only used to check for stray signals"""
if len(list(self.cnxids.keys())) > 0:
dbg('Remaining signals: %s' % self.cnxids)
def new(self, widget, signal, handler, *args):
"""Register a new signal on a widget"""
if widget not in self.cnxids:
dbg('creating new bucket for %s' % type(widget))
self.cnxids[widget] = {}
if signal in self.cnxids[widget]:
err('%s already has a handler for %s' % (id(widget), signal))
self.cnxids[widget][signal] = widget.connect(signal, handler, *args)
dbg('connected %s::%s to %s' % (type(widget), signal, handler))
return(self.cnxids[widget][signal])
def remove_signal(self, widget, signal):
"""Remove a signal handler"""
if widget not in self.cnxids:
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dbg('%s is not registered' % widget)
return
if signal not in self.cnxids[widget]:
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dbg('%s not registered for %s' % (signal, type(widget)))
return
dbg('removing %s::%s' % (type(widget), signal))
widget.disconnect(self.cnxids[widget][signal])
del(self.cnxids[widget][signal])
if len(list(self.cnxids[widget].keys())) == 0:
dbg('no more signals for widget')
del(self.cnxids[widget])
def remove_widget(self, widget):
"""Remove all signal handlers for a widget"""
if widget not in self.cnxids:
dbg('%s not registered' % widget)
return
signals = list(self.cnxids[widget].keys())
for signal in signals:
self.remove_signal(widget, signal)
def remove_all(self):
"""Remove all signal handlers for all widgets"""
widgets = list(self.cnxids.keys())
for widget in widgets:
self.remove_widget(widget)