emit a signal into an MdiSubWindow

[Qtdigitex]

Hello , i'm using pyqt 4 and i have a issue with signals

i'm trying to send a signal into an QmdiSubWindow , from my QMainWindow whenever a button is checked to tell the QMdiSubWindow that it has been checked ,
so the way i proceed is like this :

in my QMainWindow : i connect the signal to a fonction :

self.connect (self.moveButton , SIGNAL("clicked()") , self.send_move_signal)

self.connect (self.moveButton , SIGNAL("clicked()") , self.send_move_signal)

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My send_move_Signal method :

def send_move_signal(self):
    self.moveButton.setChecked(True)
    self.mdiArea.activeSubWindow().emit ( SIGNAL("moveButton_activated"))

def send_move_signal(self):
    self.moveButton.setChecked(True)
    self.mdiArea.activeSubWindow().emit ( SIGNAL("moveButton_activated"))

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and in the constructor of my Mdi-Widget i proceed like that :

class MdiWid ( QWidget , Ui_SubMdiWindow):
    def __init__(self,parent=None):
        super(MdiWid,self).__init__(parent)
        self.connect (self , SIGNAL("moveButton_activated"),self.updateMoveState)
 
    def updateMoveState(self):
        self.moveButton_activated = True

class MdiWid ( QWidget , Ui_SubMdiWindow):
    def __init__(self,parent=None):
        super(MdiWid,self).__init__(parent)
        self.connect (self , SIGNAL("moveButton_activated"),self.updateMoveState)

    def updateMoveState(self):
        self.moveButton_activated = True

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But it doesn't work , and i don't see why

Any help please ,