Slideshow mode

[eeroel]

Hi,

I was thinking it would be cool to see a simple presentation/slideshow mode in JupyterLab, which at its simplest could be just "one slide = one cell". I found this related issue from a few years ago, but it has been closed: #3139, and I'm aware of RISE, but I think a native mode like this would be useful for situations where you don't need any advanced slideshow features, and you just want to limit what is shown on the screen.

I think the functionality is already 90% there in Retrolab, given Zen Mode and arrow key navigation of cells. I made a prototype with CSS tweaks on top of Retrolab (tested in Firefox and Chrome), which also displays markdown before code cells as headings (screenshots attached): https://gist.github.com/eeroel/ac6b9721e768810e351a71bfb3efded6

Basically it boils down to stretching a cell to 100% height, hiding distracting UI elements and handling "Code cell after markdown" in a special way to allow showing the headings. The drawback of using this trick for headings is that navigation doesn't work exactly like a slideshow: you first see heading + code, then only code, and only then advance to the next "slide", and the heading disappears when you start editing code. But I imagine either this or a simpler version (without headings) would still be useful for giving talks.

Screenshots of the styling example:

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[jtpio]

Thanks @eeroel for opening this.

There is ongoing work to port the RISE extension to JupyterLab: damianavila/RISE#605

That way it will also be compatible with RetroLab and the future Notebook v7.

Should we move the discussion there? Thanks!