Adding a slideshow view

[beltranaceves]

It seems like livebook is commonly used in talks and presentations to illustrate elixir code and it would be pretty nice if we could present notebooks as slides.
It's not the first time this has been brought up (discussion 1, discussion 2, twitter thread), but it either required too much development effort or there was no good justification for it.

I think that using the View mechanism can be a good compromise, since it would need only some small changes and might not be too much of a chore to maintain while delivering a good enough implementation.

This is my barebones take on it:

2025-02-21.22-23-42.mov

• Each section becomes a slide, and only one section is shown at a time
  • Sections bigger than the viewport are scrollable, instead of occupying two slides
• Visible cell outputs
• Hidden sidebar
• Hidden title and dependencies sections
• Hidden secondary actions, visible primary actions (allow cell execution but prevent modifying elements)
• No new UI elements like next/prev buttons or slide counter
• Arrow left/right and left/right mouse click for navigating slides
• Notebook scroll preserved between view changes
• Correct cell focus on slide change
• V -> S as shortcut
  • Regrettably, this makes the shortcut list be of odd length

Link to repo