Trait Error: The ‘children’ trait of a VBox instance ... itkwidgets 1.0a16

[kevinsweeney84]

Getting TraitError: The 'children' trait of a VBox instance contains an Instance of a TypedTuple which expected a Widget, not the Viewer at '0x2aaab5d0ad00'.

when running the code below in Jupyter Lab

import itkwidgets
import ipywidgets
    
view = itkwidgets.view(geometries=None, background=[0.0, 0.0, 0.0])

# Headings
heading = ipywidgets.HTML(value="<h1>Heading</h1>")

# Output Widget
widget = ipywidgets.VBox(children = [heading, view])

Below are my versions of packages.

itkwidgets 1.0a16 pypi_0 pypi
ipywidgets 7.6.5 pyhd3eb1b0_1 defaults

When running with version 0.X of itkwidgets this error does not occur

itkwidgets 0.32.0 py38h32f6830_0 conda-forge

[thewtex]

@kevinsweeney84 thanks for the report.

In version 1.X, we also work outside Jupyter.

We are adding detection of the environment in #558

For Jupyter environments, we will:

• Create a new ViewerWidget class that inherits from ipywidgets.Widget -- return this from view.
• Hook up callbacks from the viewer eventEmitter to update associated traitlets
• Have traitlets call get_ methods to provide their value

[kevinsweeney84]

@thewtex I see that you have closed #558 , congrats.
Do you have an approximate timeline as to when this will be available through pip?

[thewtex]

Yes, making progress towards this. The other blocker is #568 , which is a bit tricky and hard to estimate a timeline.

[kevinsweeney84]

@thewtex I installed your commit from #558 using pip

• pip install git+https://github.com/InsightSoftwareConsortium/itkwidgets.git@302126a3e17d3ef8b848136a0c973e0bb142ceee#egg=itkwidgets
• Installed package information
  • itkwidgets 1.0a18.dev12+g302126a pypi_0 pypi

but I am still seeing the same error:

• TraitError: The 'children' trait of a VBox instance contains an Instance of a TypedTuple which expected a Widget, not the Viewer at '0x2aab2b843430'.

Should this be fixed in this instance?

[thewtex]

@kevinsweeney84 not, yet but we are working on it.

[hjmjohnson]

@thewtex This bug is affecting itk notebooks tutorials as well.