Sets the zoom locus of the mouse wheel to the point 0,0
        (instead of the coordinates under the cursor)

def setZeroWheel(self):
        """Sets the zoom locus of the mouse wheel to the point 0,0
        (instead of the coordinates under the cursor)"""
        self._zeroWheel = True
        # want padding in this case
        self.menu.viewAll.triggered.disconnect()
        self.menu.viewAll.triggered.connect(self.autoRange)