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_signalhelper.pyc
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Python Compiled Bytecode
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2014-12-31
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244 lines
# Source Generated with Decompyle++
# File: in.pyc (Python 2.7)
import sys
import inspect
from _gi import _gobject
if sys.version_info <= sys.version_info:
pass
elif 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
the signal name.'''
return self.gobj.connect(self, callback, *args, **kargs)
def connect_detailed(self, callback, detail, *args, **kargs):
'''Same as GObject.Object.connect except there is no need to specify
the signal name. In addition concats "::<detail>" to the signal name
when connecting; for use with notifications like "notify" when a property
changes.
'''
return self.gobj.connect(self + '::' + detail, callback, *args, **kargs)
def disconnect(self, handler_id):
'''Same as GObject.Object.disconnect.'''
self.instance.disconnect(handler_id)
def emit(self, *args, **kargs):
'''Same as GObject.Object.emit except there is no need to specify
the signal name.'''
return self.gobj.emit(str(self), *args, **kargs)
def __new__(cls, name = '', *args, **kargs):
if callable(name):
name = name.__name__
return str.__new__(cls, name)
def __init__(self, name = '', func = None, flags = _gobject.SIGNAL_RUN_FIRST, return_type = None, arg_types = None, doc = '', accumulator = None, accu_data = None):
if func and not name:
name = func.__name__
elif callable(name):
func = name
name = func.__name__
if func and not doc:
doc = func.__doc__
str.__init__(self)
if func:
if not return_type:
pass
if not arg_types:
(return_type, arg_types) = get_signal_annotations(func)
if arg_types is None:
arg_types = tuple()
self.func = func
self.flags = flags
self.return_type = return_type
self.arg_types = arg_types
self.__doc__ = doc
self.accumulator = accumulator
self.accu_data = accu_data
def __get__(self, instance, owner = None):
'''Returns a BoundSignal when accessed on an object instance.'''
if instance is None:
return self
return None.BoundSignal(self, instance)
def __call__(self, obj, *args, **kargs):
'''Allows for instantiated Signals to be used as a decorator or calling
of the underlying signal method.'''
if isinstance(obj, _gobject.GObject):
self.func(obj, *args, **kargs)
elif str(self):
name = str(self)
else:
name = obj.__name__
return type(self)(name = name, func = obj, flags = self.flags, return_type = self.return_type, arg_types = self.arg_types, doc = self.__doc__, accumulator = self.accumulator, accu_data = self.accu_data)
def copy(self, newName = None):
'''Returns a renamed copy of the Signal.'''
if newName is None:
newName = self.name
return type(self)(name = newName, func = self.func, flags = self.flags, return_type = self.return_type, arg_types = self.arg_types, doc = self.__doc__, accumulator = self.accumulator, accu_data = self.accu_data)
def get_signal_args(self):
'''Returns a tuple of: (flags, return_type, arg_types, accumulator, accu_data)'''
return (self.flags, self.return_type, self.arg_types, self.accumulator, self.accu_data)
class SignalOverride(Signal):
'''Specialized sub-class of Signal which can be used as a decorator for overriding
existing signals on GObjects.
:Example:
.. code-block:: python
class MyWidget(Gtk.Widget):
@GObject.SignalOverride
def configure_event(self):
pass
'''
def get_signal_args(self):
"""Returns the string 'override'."""
return 'override'
def get_signal_annotations(func):
"""Attempt pulling python 3 function annotations off of 'func' for
use as a signals type information. Returns an ordered nested tuple
of (return_type, (arg_type1, arg_type2, ...)). If the given function
does not have annotations then (None, tuple()) is returned.
"""
arg_types = tuple()
return_type = None
if hasattr(func, '__annotations__'):
spec = inspect.getfullargspec(func)
arg_types = (tuple,)((lambda .0: pass)(spec.args))
if 'return' in spec.annotations:
return_type = spec.annotations['return']
return (return_type, arg_types)
def install_signals(cls):
"""Adds Signal instances on a GObject derived class into the '__gsignals__'
dictionary to be picked up and registered as real GObject signals.
"""
gsignals = cls.__dict__.get('__gsignals__', { })
newsignals = { }
for name, signal in cls.__dict__.items():
if isinstance(signal, Signal):
signalName = str(signal)
if not signalName:
signalName = name
signal = signal.copy(name)
setattr(cls, name, signal)
if signalName in gsignals:
raise ValueError('Signal "%s" has already been registered.' % name)
newsignals[signalName] = signal
gsignals[signalName] = signal.get_signal_args()
continue
cls.__gsignals__ = gsignals
for name, signal in newsignals.items():
if signal.func is not None:
funcName = 'do_' + name.replace('-', '_')
if not hasattr(cls, funcName):
setattr(cls, funcName, signal.func)