tree 9f461db5340dc2d328a2c28c9d1a8bd0ce62129e
parent de3ffa447e5423360abda201e84a0d8f9c3fcc11
author Marc Kupietz <kupietz@ids-mannheim.de> 1788090033 +0300
committer Marc Kupietz <kupietz@ids-mannheim.de> 1788090033 +0300

ids theme: adaptive vertical centering of slide content

Slides with little content look lost when everything is glued below the
title bar, while packed slides must start at the top. reveal.js' own
center option cannot express this -- it also vertically centers the
headings.

Instead the template groups each slide's body content (everything after
the heading block except speaker notes) into a div.ids-slide-content,
and the theme turns such slides into flex columns of full slide height:
the heading block stays pinned to the top and the wrapper's auto margins
center the content in the remaining space. Auto margins collapse to zero
when there is no free space, so packed slides still start directly below
the heading and overflow downwards exactly as before -- no measuring and
no resize handling involved. The wrapper also reserves the footer band
(--ids-footer-reserve, published from the actual footer height in slide
coordinates), so centered content never covers the footer; slides too
packed to fit above it may, as they always could.

Heading-only section-divider slides keep their dedicated centered-title
layout, the transcript view treats the wrapper transparently, and the
new rules are screen-scoped so the pdf export keeps laying out slides
itself.

Change-Id: Iccfbebebbf18ec860c1ccd950043a84f638c33da