def zoom_in(self):
        """Zoom the view in one zoom step.
        """
        viewer = self.getfocus_viewer()
        if hasattr(viewer, 'zoom_in'):
            viewer.zoom_in()
        return True
def zoom_in ( self ) : viewer = self . getfocus_viewer ( ) if hasattr ( viewer , 'zoom_in' ) : viewer . zoom_in ( ) return True
Zoom the view in one zoom step.