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ƒ}çà&„ # -*- Mode: Python; py-indent-offset: 4 -*-
# pygobject - Python bindings for the GObject library
# Copyright (C) 2012 Simon Feltman
#
# gi/_signalhelper.py: GObject signal binding decorator object
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see .
import sys
from ._gi import _gobject
# Callable went away in python 3.0 and came back in 3.2.
# Use versioning to figure out when to define it, otherwise we have to deal with
# the complexity of using __builtin__ or builtin between python versions to
# check if callable exists which PyFlakes will also complain about.
if (3, 0) <= sys.version_info < (3, 2):
def callable(fn):
return hasattr(fn, '__call__')
class Signal(str):
"""Object which gives a nice API for creating and binding signals.
:param name:
Name of signal or callable closure when used as a decorator.
:type name: str or callable
:param callable func:
Callable closure method.
:param GObject.SignalFlags flags:
Flags specifying when to run closure.
:param type return_type:
Return type of the Signal.
:param list arg_types:
List of argument types specifying the signals function signature
:param str doc:
Documentation of signal object.
:param callable accumulator:
Accumulator method with the signature:
func(ihint, return_accu, handler_return, accu_data) -> boolean
:param object accu_data:
User data passed to the accumulator.
:Example:
.. code-block:: python
class Spam(GObject.Object):
velocity = 0
@GObject.Signal
def pushed(self):
self.velocity += 1
@GObject.Signal(flags=GObject.SignalFlags.RUN_LAST)
def pulled(self):
self.velocity -= 1
stomped = GObject.Signal('stomped', arg_types=(int,))
@GObject.Signal
def annotated_signal(self, a:int, b:str):
"Python3 annotation support for parameter types.
def on_pushed(obj):
print(obj)
spam = Spam()
spam.pushed.connect(on_pushed)
spam.pushed.emit()
"""
class BoundSignal(str):
"""
Temporary binding object which can be used for connecting signals
without specifying the signal name string to connect.
"""
def __new__(cls, name, *args, **kargs):
return str.__new__(cls, name)
def __init__(self, signal, gobj):
str.__init__(self)
self.signal = signal
self.gobj = gobj
def __repr__(self):
return 'BoundSignal("%s")' % self
def __call__(self, *args, **kargs):
"""Call the signals closure."""
return self.signal.func(self.gobj, *args, **kargs)
def connect(self, callback, *args, **kargs):
"""Same as GObject.Object.connect except there is no need to specify