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Embedding in an ipywidgets app

In this example we demonstrate embedding the RemoteFrameBuffer class inside a larger ipywidgets app.

import numpy as np
import ipywidgets
import jupyter_rfb

Implement a simple RFB class, for the sake of the example:

class SimpleRFB(jupyter_rfb.RemoteFrameBuffer):
    green_value = 200

    def get_frame(self):
        a = np.zeros((100, 100, 3), np.uint8)
        a[20:-20, 20:-20, 1] = self.green_value
        return a

Compose a simple app:

slider = ipywidgets.IntSlider(min=50, max=255, value=200)
rfb = SimpleRFB()


def on_slider_change(change):
    rfb.green_value = change["new"]
    rfb.request_draw()


slider.observe(on_slider_change, names="value")
ipywidgets.HBox([rfb, slider])