utils.py 文件源码

def wait_for_apt_cache_ready(f):
    """ decorator that ensures that self.cache is ready using a
        gtk idle_add - needs a cache as argument
    """
    def wrapper(*args, **kwargs):
        self = args[0]
        # check if the cache is ready and
        window = None
        if hasattr(self, "app_view"):
            window = self.app_view.get_window()
        if not self.cache.ready:
            if window:
                window.set_cursor(self.busy_cursor)
            GObject.timeout_add(500, lambda: wrapper(*args, **kwargs))
            return False
        # cache ready now
        if window:
            window.set_cursor(None)
        f(*args, **kwargs)
        return False
    return wrapper