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_signalhelper.py

# -*- 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 <http://www.gnu.org/licenses/>.

from . import _gi

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.gobj.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=_gi.SIGNAL_RUN_FIRST,
                 return_type=None, arg_types=None, doc='', accumulator=None, accu_data=None):
        if func is None and callable(name):
            func = name

if func and not doc:
            doc = func.__doc__

str.__init__(self)

if func and not (return_type or 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 self.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 obj is a GObject, than we call this signal as a closure otherwise
        # it is used as a re-application of a decorator.
        if isinstance(obj, _gi.GObject):
            self.func(obj, *args, **kargs)
        else:
            # If self is already an allocated name, use it otherwise create a new named
            # signal using the closure name as the name.
            if str(self):
                name = str(self)
            else:
                name = obj.__name__
            # Return a new value of this type since it is based on an immutable string.
            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."""

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__'):
        # import inspect only when needed because it takes ~10 msec to load
        import inspect
        spec = inspect.getfullargspec(func)
        arg_types = tuple(spec.annotations[arg] for arg in spec.args
                          if arg in spec.annotations)
        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)
            # Fixup a signal which is unnamed by using the class variable name.
            # Since Signal is based on string which immutable,
            # we must copy and replace the class variable.
            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()

cls.__gsignals__ = gsignals

# Setup signal closures by adding the specially named
    # method to the class in the form of "do_<signal_name>".
    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)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2021-01-20 01:12:10
..	dir	-	root/root	0755	2025-05-29 08:31:30
__pycache__	dir	-	root/root	0755	2021-01-20 01:12:10
overrides	dir	-	root/root	0755	2021-01-20 01:12:10
repository	dir	-	root/root	0755	2021-01-20 01:12:10
__init__.py	text/x-script.python	5.76 KB	root/root	0644	2019-12-30 11:13:06
_compat.py	text/x-script.python	1.46 KB	root/root	0644	2019-12-30 11:13:06
_constants.py	text/x-script.python	1.92 KB	root/root	0644	2019-12-30 11:13:06
_error.py	text/x-script.python	2.03 KB	root/root	0644	2019-12-30 11:13:06
_gi.cpython-38-x86_64-linux-gnu.so	application/x-sharedlib	336.58 KB	root/root	0644	2020-03-15 11:35:24
_gtktemplate.py	text/x-script.python	7.65 KB	root/root	0644	2019-12-30 11:13:06
_option.py	text/x-script.python	12.88 KB	root/root	0644	2019-12-30 11:13:06
_ossighelper.py	text/x-script.python	7.89 KB	root/root	0644	2019-12-30 11:13:06
_propertyhelper.py	text/x-script.python	14 KB	root/root	0644	2019-12-30 11:13:06
_signalhelper.py	text/x-script.python	9.08 KB	root/root	0644	2019-12-30 11:13:06
docstring.py	text/x-script.python	6.53 KB	root/root	0644	2019-08-25 05:33:55
importer.py	text/x-script.python	5.16 KB	root/root	0644	2019-12-30 11:13:06
module.py	text/x-script.python	9.48 KB	root/root	0644	2019-12-30 11:13:06
pygtkcompat.py	text/x-script.python	766 B	root/root	0644	2019-08-25 05:33:55
types.py	text/x-script.python	13.99 KB	root/root	0644	2019-12-30 11:13:06

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