preview.py 文件源码

def __init__(self, clip=None, *args, **kwargs):
        super(Preview, self).__init__(*args, **kwargs, clip=clip)
        self.links = [directional_link((self._ui_intslider, 'value'), (self, 'frame'))]

        prev = Button(icon="fa-step-backward", layout=Layout(width="50px"))
        prev.on_click(lambda s: self.step(-1))
        next = Button(icon="fa-step-forward", layout=Layout(width="50px"))
        next.on_click(lambda s: self.step(1))

        self.children = [
            HBox([prev, next, self._ui_intslider]),
            self._current
        ]