Widget state not being saved correctly

Hi there,

I am working on using ipycanvas for a data annotation widget. Typically, I document my widget packages by:

• writing a jupyter notebook with the widgets in
• executing them manually (once)
• saving them using the jupyter notebook Widgets > Save widget state functionality
• include them in my sphinx documentation using nbsphinx

This works well for some widgets (e.g. here, where the buttons are still interactive).

However, when I try and do this with ipycanvas widgets (I am nesting a MultiCanvas inside a VBox), the widgets are not displayed properly.

Is there an issue there that I’m missing? Do I need to do anything “special” to include ipycanvas widgets? Or is it an ipycanvas bug?

Thanks very much, Jan

[martinRenou]

This is now fixed in 0.4.2! Please give it a try 😃

It is available with pip, not yet with conda. You need to set sync_image_data to True on your canvas for it to work.

[janfreyberg]

Thanks - yes, I tried using sync_image_data and like you say this doesn’t solve the issue. And really, the static image is all I would want - it’s mainly so I can (programatically) show what a canvas onto which I’ve drawn a few things would look like.