widgets.py 文件源码

def preview(self, generator=None):
        log.debug("Starting Preview")
        if not generator:
            log.info("Creating Generator from Camera")
            generator = self.cam.generate_preview()
        self.image_generator = self.previewer.producer(generator)
        self.previewing = Clock.schedule_interval(self.update_image, 1 / 30)