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class mySelecter(QCanvasRectangle):
	""" This class define the rectangle drawn when moving the mouse with de Shfit button pressed. It allows the user to select multiple devices"
	"""
	def __init__(self, x,y,w=1,h=1,canvas=None):
		QCanvasRectangle.__init__(self,x,y,w,h,canvas)
		self.setPen( QPen(QColor(0,0,0),1,Qt.DotLine) )
	def boundingRect(self):
		rect = QCanvasRectangle.boundingRect(self)
		return QRect(rect.x()-5,rect.y()-5,rect.width()+5,rect.height()+5)