segnali.py

from PyQt4.Qt import *

def teeSignal(*sig_args, **kwargs):
    if "name" not in kwargs:
        raise ValueError("Signal name required for old style emit compatibility")
    class X(QObject):
        signal = pyqtSignal(*sig_args, **kwargs)
    x = X()
    sig_name = kwargs["name"]
    has_args = len(sig_args) > 0
    class Signal(QObject):
        def __getattribute__(self, name):
            signal = x.signal
            parent = super(Signal, self).parent()
            if name == "emit":
                def emit(*args):
                    if has_args:
                        signal.emit(*args)
                        parent.emit(SIGNAL(sig_name), *args)
                    else:
                        signal.emit()
                        parent.emit(SIGNAL(sig_name))
                return emit
            return getattr(signal, name)
    return Signal

class TestWidget(QPushButton):
    fired = property(teeSignal(name="fired"))
    def __init__(self):
        super(TestWidget, self).__init__("Click me!")
        self.clicked.connect(self.fire)
        self.fired.connect(self.fired_("new"))
        self.fired.connect(self.fired_("new"))
        QObject.connect(self, SIGNAL("fired"), self.fired_("old"))
        QObject.connect(self, SIGNAL("fired"), self.fired_("old"))
    def fire(self, arg):
        self.fired.emit()
    def fired_(self, ver):
        def f():
            print("fired", ver)
        return f