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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/toolbar.css
+40
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@@ -190,4 +190,44 @@
width: auto;
}
}
/* What a toolbar at the bottom covers, published as --material-bottom-toolbar: the distance from
* the window's bottom edge to the toolbar's top, each formula the placement above plus the
* height. The snackbar clears it (toast.css) — M3 nudges a snackbar "upward to avoid overlapping
* FABs/docked toolbars" and never puts one "in front of … navigation"
* (docs/reference/m3/components-actions-communication-containment.md § Snackbar) — and a page
* pads its end with it, so its last line never hides behind the toolbar.
*
* Declared on the root and again on <x-scaffold>'s root: a custom property resolves its var()s
* where it is declared, and --material-bottom-bar is only set on the scaffold's root, so only
* there does the formula see the bar. A floating toolbar is 64px, beside an 80px (`md`) or
* 96px (`lg`) FAB as tall as the FAB; a docked one is 64px plus the bottom safe area it pads,
* until `rounded` lifts it off the edge from `expanded`. A vertical toolbar, which belongs at
* the end edge, publishes nothing. */
:root:has([data-md-toolbar-place='bottom']:is([data-md-toolbar], [data-md-toolbar-group]):not([data-md-vertical])),
[data-md-scaffold]:has([data-md-toolbar-place='bottom']:is([data-md-toolbar], [data-md-toolbar-group]):not([data-md-vertical])) {
--material-bottom-toolbar: calc(max(var(--material-bottom-bar, 0px), var(--material-safe-bottom, env(safe-area-inset-bottom))) + var(--md-sys-measurement-space200) + 64px);
}
:root:has([data-md-toolbar-group][data-md-toolbar-place='bottom']:not([data-md-vertical]) [data-md-fab][data-md-size='md']),
[data-md-scaffold]:has([data-md-toolbar-group][data-md-toolbar-place='bottom']:not([data-md-vertical]) [data-md-fab][data-md-size='md']) {
--material-bottom-toolbar: calc(max(var(--material-bottom-bar, 0px), var(--material-safe-bottom, env(safe-area-inset-bottom))) + var(--md-sys-measurement-space200) + 80px);
}
:root:has([data-md-toolbar-group][data-md-toolbar-place='bottom']:not([data-md-vertical]) [data-md-fab][data-md-size='lg']),
[data-md-scaffold]:has([data-md-toolbar-group][data-md-toolbar-place='bottom']:not([data-md-vertical]) [data-md-fab][data-md-size='lg']) {
--material-bottom-toolbar: calc(max(var(--material-bottom-bar, 0px), var(--material-safe-bottom, env(safe-area-inset-bottom))) + var(--md-sys-measurement-space200) + 96px);
}
:root:has([data-md-toolbar][data-md-variant='docked'][data-md-toolbar-place='bottom']),
[data-md-scaffold]:has([data-md-toolbar][data-md-variant='docked'][data-md-toolbar-place='bottom']) {
--material-bottom-toolbar: calc(var(--material-bottom-bar, 0px) + 64px + var(--material-safe-bottom, env(safe-area-inset-bottom)));
}
@media (width >= 840px) {
:root:has([data-md-toolbar][data-md-variant='docked'][data-md-rounded][data-md-toolbar-place='bottom']),
[data-md-scaffold]:has([data-md-toolbar][data-md-variant='docked'][data-md-rounded][data-md-toolbar-place='bottom']) {
--material-bottom-toolbar: calc(max(var(--material-bottom-bar, 0px), var(--material-safe-bottom, env(safe-area-inset-bottom))) + var(--md-sys-measurement-space200) + 64px);
}
}
}