superZoom.py

from mojo.events import addObserver

class SuperZoom(object):
    
    def __init__(self):
        addObserver(self, "keyDown", "keyDown")
    
    def keyDown(self, notification):
        view = notification["view"]        
        event = notification["event"]
        characters = event.characters()        
        factor = 5
        
        if characters == "Z":  # shift + z
            view.zoomIn(factor)
        elif characters == "X":  # shift + x
            view.zoomOut(1 / factor)
    
    
SuperZoom()