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Centre the app bar's headline on a grid and curve its search bar

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The centred headline was absolutely positioned 56px in from each edge — room for
exactly one of M3's two trailing icon buttons, so a long title ellipsised behind
them. It is now the middle column of a three-column row and shrinks against
whatever is really beside it. The search container follows M3's curve, filling
the row to 312dp and then only half of what is left, so the showcase drops the
hand-written max-width it had been working around it with.
Plan: docs/plans/material-3-alignment.md, step 21 (navigation N-09, N-11).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
This commit is contained in:
Andreas Reinhold / reini
2026-09-14 06:07:30 +02:00
co-authored by Claude Opus 5
parent 0aef7f1f96
commit 789e8b2970
3 changed files with 48 additions and 13 deletions
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resources/css/components/app-bar.css
+36 -12
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@@ -4,10 +4,11 @@
*
* small 64px, title-large title (label-medium subtitle), 4px from the edges, the title 16px
* from the start or straight after the navigation icon
* center the same, the title centred
* center the same, the title centred — a three-column grid, so it shrinks against whatever is
* beside it rather than ellipsising underneath it
* medium 112px (136px with a subtitle): the 64px row of icons over a headline-medium title
* large 120px (152px with a subtitle): a display-small title
* search the row holds a search bar
* search the row holds a search bar, full width to 312px and then half of what is left
*
* The container is the surface, and surface-container once content scrolls under it. A medium or
* large bar collapses into the small one without script moving anything: the bar is sticky at a
@@ -118,21 +119,44 @@
letter-spacing: var(--md-sys-typescale-label-md-tracking);
}
/* Centred: the headline spans the row and centres its text between whatever is at either end. */
[data-app-bar][data-variant="center"] [data-app-bar-headline] {
position: absolute;
inset-inline: 3.5rem;
top: 0;
bottom: 0;
align-items: center;
text-align: center;
pointer-events: none;
/* Centred: a three-column row — leading, headline, trailing — so the headline is centred in the
window and shrinks against whatever is actually beside it. M3 allows two trailing icon
buttons, which a fixed inset for one would have let a long title ellipsise underneath. */
[data-app-bar][data-variant="center"] [data-app-bar-row] {
display: grid;
grid-template-columns: 1fr auto 1fr;
}
/* The search bar fills the row. */
[data-app-bar][data-variant="center"] [data-app-bar-leading] {
grid-column: 1;
justify-self: start;
}
[data-app-bar][data-variant="center"] [data-app-bar-headline] {
grid-column: 2;
min-width: 0;
align-items: center;
justify-self: center;
padding-inline: 0.75rem;
text-align: center;
}
[data-app-bar][data-variant="center"] [data-app-bar-trailing] {
grid-column: 3;
justify-self: end;
margin-inline-start: 0;
}
/* The search bar fills the space between the leading and trailing elements until it is 312dp
wide, and then grows into only half of what is left
(docs/reference/m3/components-navigation-selection-inputs.md § Top app bar). The percentage
is of the row rather than of that space, which CSS cannot name without measuring it; below
312px the cap never binds, so a phone still gets the whole row. */
[data-app-bar-search] {
min-width: 0;
max-width: calc(19.5rem + (100% - 19.5rem) / 2);
flex: 1 1 0%;
margin-inline: auto;
padding-inline: 0.25rem;
}