from browser import window
# interface to screenful

class ScreenfulEmptyShell:
    def __init__(self):
        func = lambda: None
        self.Editor = {"changed": func}
        
def screenful():
    return window.Screenful if window.Screenful else ScreenfulEmptyShell()
            
            
def changed():
    console.log(Screenful, window.Screenful)
    screenful().Editor.changed();