Problems with limited mouseMoveEvent

[dodgeit]

Hi all,

i'm trying to do a very simple thing but i'm not able to get the result i want ;(

I'm using QtSvg library. I want to display a shape and move it through the QGraphicsScene. I have done it and it works fine. The problem comes when i try to limit its movement, for example, if i want to limit its movement in x to 20 pixels from its original position.
The mouseMoveEvent function that i have implemented is show below where "self.posi" is the initial position of the shape...

class SvgElement(QtSvg.QGraphicsSvgItem):
    ...
    ...
    ...
 
    def mouseMoveEvent (self, e):
        xValue = 0
        if self.pos().x() <= self.posi.x()+threshold and self.pos().x() >= self.posi.x()-threshold:
            super(SvgElement,self).mouseMoveEvent (e)
        else:
            if self.pos().x() >= self.posi.x()+threshold:
                xValue = self.posi.x()+self.threshold
            elif self.pos().x() < self.posi.x()-threshold:
                xValue = self.posi.x()-threshold
 
            self.setPos(xValue, self.pos().y())

class SvgElement(QtSvg.QGraphicsSvgItem):
    ...
    ...
    ...
    
    def mouseMoveEvent (self, e):
        xValue = 0
        if self.pos().x() <= self.posi.x()+threshold and self.pos().x() >= self.posi.x()-threshold:
            super(SvgElement,self).mouseMoveEvent (e)
        else:
            if self.pos().x() >= self.posi.x()+threshold:
                xValue = self.posi.x()+self.threshold
            elif self.pos().x() < self.posi.x()-threshold:
                xValue = self.posi.x()-threshold
                
            self.setPos(xValue, self.pos().y())

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I'm not able to make it work, any idea what is it happening?
Any ideas will be appreciated