Interact with the current Deck, Slide from a kernel

[bollwyvl]

Elevator Pitch

Allow for kernels to be notified when data related to a deck changes, such as its current active index, possible indices, scroll position, etc.

Motivation

This would allow for interesting

Design Ideas

• Add jupyterlab_deck.widgets.Deck, a subclass of ipywidgets.Widget
  • add an (optional) depdendency on ipywidgets and/or ipylab
  • expose most of the current state of the current deck in a bidirectional manner
    • active_index
    • possible_directions
    • slide_type
    • active_widget
      • might be tricky to know the available main area widgets
    • styles
    • scroll_position (if relevant)
      • especially interesting for scroll-based effects, such as
        • https://muffinman.io/blog/draw-svg-rope-using-javascript/
• on the typescript side
  • hook into the DeckManager

This will be complicated by RTC, which still doesn't have a good story for widget state