def _update(self, *largs):
        # want to start it ?
        if self._start_wanted:
            if not self._running:
                self.start()
            self._start_wanted = False

        # in pause mode, don't unqueue anything.
        if self._paused:
            self._trigger_update()
            return

        for x in range(self.max_upload_per_frame):
            try:
                filename, data = self._q_done.pop()
            except IndexError:
                return

            # create the image
            image = data  # ProxyImage(data)
            if not image.nocache:
                Cache.append('kv.loader', filename, image)

            # update client
            for c_filename, client in self._client[:]:
                if filename != c_filename:
                    continue
                # got one client to update
                client.image = image
                client.loaded = True
                client.dispatch('on_load')
                self._client.remove((c_filename, client))

        self._trigger_update()
(internal) Check if a data is loaded, and pass to the client.
dataset/ETHPy150Open kivy/kivy/kivy/loader.py/LoaderBase._update