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Lift the snackbar above a toolbar placed at the bottom

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SealShare's only navigation is a floating toolbar at place="bottom". In
1.x it set --material-bottom-bar to lift the snackbar over it; in 2.0.0
the toolbar reads that variable to place itself, so an application can
no longer set it, and the snackbar landed on the toolbar. M3 nudges a
snackbar "upward to avoid overlapping FABs/docked toolbars" and never
puts one in front of navigation.

A bottom-placed toolbar now publishes --material-bottom-toolbar, the
distance from the window's bottom edge to its top: floating 64px (as
tall as an md or lg FAB beside it), docked 64px plus the safe area it
pads, rounded docked floating from 840px. It is declared on :root and
again on the scaffold's root, the only place its formula sees the bar.
The snackbar clears whichever of the bar and the toolbar reaches higher,
and a page pads its end with it. Two Chromium tests, both failing on the
old formula: a docked toolbar on a scaffold's navigation bar, and a
floating toolbar without a scaffold (plan step 46).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Andreas Reinhold / reini
2026-09-15 10:47:50 +02:00
co-authored by Claude Opus 5
parent 579af9e7a9
commit d0bed0da69
9 changed files with 124 additions and 9 deletions
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resources/css/components/toast.css
+5 -3
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@@ -10,8 +10,10 @@
* the text through `[data-md-toast-wrap]`, bound the same way — M3's "two lines with longer
* action" configuration.
*
* It lifts above a bottom bar through `--material-bottom-bar`; `data-md-position="bottom-start"`
* moves it to the start edge, with M3's margin growing from `medium`. resources/js/snackbar.js
* It lifts above a bottom bar through `--material-bottom-bar`, and above a toolbar placed at the
* bottom through the `--material-bottom-toolbar` toolbar.css publishes — whichever reaches higher,
* as M3 nudges a snackbar clear of a docked toolbar and never in front of navigation;
* `data-md-position="bottom-start"` moves it to the start edge, with M3's margin growing from `medium`. resources/js/snackbar.js
* publishes the snackbar's own height as `--material-snackbar-height`, so a FAB (fab.css) can
* lift clear of it — M3 puts a snackbar above a FAB, never in front of or behind one (ACT-17).
* Below `medium` it is full width; from there it hugs its line length, which an application's own
@@ -37,7 +39,7 @@
position: fixed;
z-index: 50;
inset-inline: var(--md-sys-measurement-space200);
bottom: calc(var(--material-bottom-bar, 0px) + var(--md-sys-measurement-space200));
bottom: calc(max(var(--material-bottom-bar, 0px), var(--material-bottom-toolbar, 0px)) + var(--md-sys-measurement-space200));
display: flex;
justify-content: center;
pointer-events: none;