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Draw the FAB without Tailwind

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Plan step 36. <x-fab> renders data-md-fab with data-md-size,
data-md-color, data-md-variant, data-md-extended and, collapsing on
scroll, data-md-collapse-on-scroll with a bound data-md-collapsed; it
passes its glyph's size to <x-icon>. fab.css draws FabBaseline/Medium/
LargeTokens and ExtendedFab*Tokens per size, the container and filled
colours, elevation 3 and 4 on hover, the state layer and focus ring,
and the collapse morph that leaves actions.css.

data-fab becomes data-md-fab, also in navigation.css (the rail flattens
a nested FAB) and toolbar.css (a docked toolbar's FAB), with their tests.
The actions browser test gains the owed collapse-on-scroll test.

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 15:06:45 +02:00
co-authored by Claude Opus 5
parent 2a4dcead3d
commit 1cf4f16c95
11 changed files with 357 additions and 146 deletions
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resources/css/components/actions.css
-62
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@@ -84,65 +84,3 @@
translate: 0 0.5rem;
opacity: 0;
}
/*
* An extended FAB that collapses to a FAB while the page scrolls down (`<x-fab
* collapse-on-scroll>`, resources/js/fab.js sets `data-collapsed`). M3's extended FAB page: it
* "can collapse to a FAB on scroll-down and re-expand to extended on scroll-up — when switching
* between FAB↔extended FAB, shape changes, the icon moves left, and the text label fades in/out".
*
* `width: auto` cannot transition, so the label sits in a one-column grid whose track closes to
* zero; that track is what animates, and the button lays itself out around it every frame. The
* gap and the minimum width go with it, all on the default spatial spring — the size of morph
* `state-transition-default` is for — while the label fades on the effects spring. The collapsed
* sizes are the FAB's own (FabBaseline/Medium/LargeTokens: 56/80/96px). The extended FAB's
* padding already centres the glyph at `sm` (16px + 24px + 16px) and `md` (26 + 28 + 26); at
* `lg` its 28px is 4px short of the 32px that centres a 32px glyph in 96px, so that one moves.
* Corners do not change: each size's FAB and extended FAB share one.
*
* The transition list repeats the FAB's own shadow and colour transitions, which this rule
* replaces. Under reduced motion tokens/motion.css takes every duration to zero, so it swaps.
*/
[data-fab-collapsible] {
--fab-collapsed-size: 3.5rem;
transition-property: min-inline-size, padding-inline, gap, box-shadow, background-color, color;
transition-duration:
var(--md-sys-motion-spatial-default-duration), var(--md-sys-motion-spatial-default-duration), var(--md-sys-motion-spatial-default-duration),
var(--md-sys-motion-effects-fast-duration), var(--md-sys-motion-effects-fast-duration), var(--md-sys-motion-effects-fast-duration);
transition-timing-function:
var(--md-sys-motion-spatial-default), var(--md-sys-motion-spatial-default), var(--md-sys-motion-spatial-default),
var(--md-sys-motion-effects-fast), var(--md-sys-motion-effects-fast), var(--md-sys-motion-effects-fast);
}
[data-fab-collapsible][data-fab-size='md'] { --fab-collapsed-size: 5rem; }
[data-fab-collapsible][data-fab-size='lg'] { --fab-collapsed-size: 6rem; }
[data-fab-label] {
display: grid;
grid-template-columns: 1fr;
transition-property: grid-template-columns, opacity;
transition-duration: var(--md-sys-motion-spatial-default-duration), var(--md-sys-motion-effects-default-duration);
transition-timing-function: var(--md-sys-motion-spatial-default), var(--md-sys-motion-effects-default);
}
[data-fab-label] > span {
overflow: hidden;
white-space: nowrap;
}
[data-fab-collapsible][data-collapsed] {
min-inline-size: var(--fab-collapsed-size);
gap: 0;
}
[data-fab-collapsible][data-fab-size='lg'][data-collapsed] {
padding-inline: 2rem;
}
/* The label stays in the accessibility tree — clipped and transparent, never `display: none` — so
the collapsed FAB keeps the name the extended one had. */
[data-fab-collapsible][data-collapsed] [data-fab-label] {
grid-template-columns: 0fr;
opacity: 0;
}