anim.py 文件源码

def __init__(self, renderer: Renderer, frame: Frame,
                 blend_mode=None, *args, **kwargs):
        super(LayerHolder, self).__init__(*args, **kwargs)

        self._renderer = renderer
        self._frame = frame
        self._blend_mode = blend_mode

        self.waiter = None
        self.active_buf = None
        self.task = None

        self.traits_changed = Signal()
        self._renderer.observe(self._traits_changed, names=['all'])

        self._renderer._flush()

        for buf in range(0, NUM_BUFFERS):
            layer = self._frame.create_layer()
            layer.blend_mode = self._blend_mode
            self._renderer._free_layer(layer)