Andreas Reinhold / reiniandClaude Opus 5
789e8b2970
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
213 lines
7.4 KiB
CSS
213 lines
7.4 KiB
CSS
/*
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* M3 Expressive's top app bars (AppBarTokens, AppBarSmallTokens, AppBarMediumFlexibleTokens,
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* AppBarLargeFlexibleTokens, androidx Compose Material 3, Apache-2.0).
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*
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* small 64px, title-large title (label-medium subtitle), 4px from the edges, the title 16px
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* from the start or straight after the navigation icon
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* center the same, the title centred — a three-column grid, so it shrinks against whatever is
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* beside it rather than ellipsising underneath it
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* medium 112px (136px with a subtitle): the 64px row of icons over a headline-medium title
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* large 120px (152px with a subtitle): a display-small title
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* search the row holds a search bar, full width to 312px and then half of what is left
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*
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* The container is the surface, and surface-container once content scrolls under it. A medium or
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* large bar collapses into the small one without script moving anything: the bar is sticky at a
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* negative top, so it scrolls up until only 64px of it remain, while its row of icons is sticky at
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* 0 inside it and stays put — the big title scrolls away under the row. Script only says when that
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* has happened (resources/js/app-bar.js), so the small title can fade in and the colour change.
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*/
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@layer components {
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[data-app-bar] {
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--app-bar-row: 4rem;
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--app-bar-height: var(--app-bar-row);
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z-index: 20;
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display: block;
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min-height: var(--app-bar-height);
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padding-top: var(--material-safe-top, env(safe-area-inset-top));
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background-color: var(--md-sys-color-surface);
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color: var(--md-sys-color-on-surface);
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transition: background-color var(--md-sys-motion-effects-default-duration) var(--md-sys-motion-effects-default);
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}
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[data-app-bar][data-variant="medium"] {
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--app-bar-height: 7rem;
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}
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[data-app-bar][data-variant="medium"][data-subtitled] {
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--app-bar-height: 8.5rem;
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}
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[data-app-bar][data-variant="large"] {
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--app-bar-height: 7.5rem;
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}
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[data-app-bar][data-variant="large"][data-subtitled] {
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--app-bar-height: 9.5rem;
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}
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[data-app-bar][data-sticky] {
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position: sticky;
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top: 0;
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}
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/* `--app-bar-measured` is the bar's real height (a title can wrap), set by app-bar.js. */
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[data-app-bar][data-sticky]:is([data-variant="medium"], [data-variant="large"]) {
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top: calc(var(--app-bar-row) - var(--app-bar-measured, var(--app-bar-height)));
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}
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[data-app-bar][data-scrolled] {
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background-color: var(--md-sys-color-surface-container);
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}
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[data-app-bar-row] {
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position: sticky;
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top: 0;
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z-index: 1;
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display: flex;
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align-items: center;
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gap: 0;
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min-height: var(--app-bar-row);
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padding-inline: 0.25rem;
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background-color: inherit;
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}
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[data-app-bar-leading],
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[data-app-bar-trailing] {
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display: flex;
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flex: none;
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align-items: center;
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color: var(--md-sys-color-on-surface-variant);
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}
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[data-app-bar-leading] {
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color: var(--md-sys-color-on-surface);
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}
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[data-app-bar-trailing] {
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margin-inline-start: auto;
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}
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[data-app-bar-headline] {
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display: flex;
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min-width: 0;
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flex: 1 1 0%;
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flex-direction: column;
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justify-content: center;
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padding-inline: 0.75rem;
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}
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[data-app-bar-row]:has([data-app-bar-leading]) [data-app-bar-headline] {
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padding-inline-start: 0.25rem;
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}
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[data-app-bar-title] {
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overflow: hidden;
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text-overflow: ellipsis;
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white-space: nowrap;
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font: var(--md-sys-typescale-title-lg);
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letter-spacing: var(--md-sys-typescale-title-lg-tracking);
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}
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[data-app-bar-subtitle] {
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overflow: hidden;
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color: var(--md-sys-color-on-surface-variant);
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text-overflow: ellipsis;
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white-space: nowrap;
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font: var(--md-sys-typescale-label-md);
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letter-spacing: var(--md-sys-typescale-label-md-tracking);
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}
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/* Centred: a three-column row — leading, headline, trailing — so the headline is centred in the
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window and shrinks against whatever is actually beside it. M3 allows two trailing icon
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buttons, which a fixed inset for one would have let a long title ellipsise underneath. */
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[data-app-bar][data-variant="center"] [data-app-bar-row] {
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display: grid;
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grid-template-columns: 1fr auto 1fr;
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}
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[data-app-bar][data-variant="center"] [data-app-bar-leading] {
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grid-column: 1;
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justify-self: start;
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}
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[data-app-bar][data-variant="center"] [data-app-bar-headline] {
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grid-column: 2;
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min-width: 0;
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align-items: center;
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justify-self: center;
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padding-inline: 0.75rem;
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text-align: center;
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}
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[data-app-bar][data-variant="center"] [data-app-bar-trailing] {
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grid-column: 3;
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justify-self: end;
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margin-inline-start: 0;
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}
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/* The search bar fills the space between the leading and trailing elements until it is 312dp
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wide, and then grows into only half of what is left
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(docs/reference/m3/components-navigation-selection-inputs.md § Top app bar). The percentage
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is of the row rather than of that space, which CSS cannot name without measuring it; below
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312px the cap never binds, so a phone still gets the whole row. */
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[data-app-bar-search] {
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min-width: 0;
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max-width: calc(19.5rem + (100% - 19.5rem) / 2);
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flex: 1 1 0%;
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margin-inline: auto;
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padding-inline: 0.25rem;
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}
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/* Medium and large: the row's title is the collapsed one, shown once the big one has gone. */
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[data-app-bar]:is([data-variant="medium"], [data-variant="large"]) [data-app-bar-row] [data-app-bar-headline] {
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opacity: 0;
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transition: opacity var(--md-sys-motion-effects-fast-duration) var(--md-sys-motion-effects-fast);
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}
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[data-app-bar][data-collapsed] [data-app-bar-row] [data-app-bar-headline] {
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opacity: 1;
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}
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/* Heights from the tokens: the title (and subtitle) lines and the space under them fill what the
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row leaves — 36 + 12px medium, 36 + 20 + 16px with a subtitle; 44 + 12px large, 44 + 24 + 20px. */
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[data-app-bar-expanded] {
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display: flex;
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min-height: calc(var(--app-bar-height) - var(--app-bar-row));
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flex-direction: column;
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justify-content: flex-end;
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padding-inline: 1rem;
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padding-bottom: 0.75rem;
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}
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[data-app-bar][data-subtitled] [data-app-bar-expanded] {
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padding-bottom: 1rem;
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}
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[data-app-bar][data-variant="large"][data-subtitled] [data-app-bar-expanded] {
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padding-bottom: 1.25rem;
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}
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[data-app-bar-expanded] [data-app-bar-title] {
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white-space: normal;
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font: var(--md-sys-typescale-headline-md);
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letter-spacing: var(--md-sys-typescale-headline-md-tracking);
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}
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[data-app-bar-expanded] [data-app-bar-subtitle] {
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font: var(--md-sys-typescale-label-lg);
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letter-spacing: var(--md-sys-typescale-label-lg-tracking);
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}
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[data-app-bar][data-variant="large"] [data-app-bar-expanded] [data-app-bar-title] {
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font: var(--md-sys-typescale-display-sm);
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letter-spacing: var(--md-sys-typescale-display-sm-tracking);
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}
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[data-app-bar][data-variant="large"] [data-app-bar-expanded] [data-app-bar-subtitle] {
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font: var(--md-sys-typescale-title-md);
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letter-spacing: var(--md-sys-typescale-title-md-tracking);
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}
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}
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