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Collapse an extended FAB to a FAB while the page scrolls

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Plan step 22, actions.md § Missing (FAB to extended FAB scroll collapse):
M3 has an extended FAB collapse to a FAB on scroll-down and re-extend on
scroll-up, and `<x-button fab>` only swapped on window width.

`<x-fab collapse-on-scroll>` (extended, with an icon) takes a
`materialFab` flag from the new resources/js/fab.js, which reads the
window's scroll once a frame, ignores moves under 8px and extends again
near the top. The morph is CSS in actions.css: the label sits in a grid
track that closes to zero, the gap and minimum width follow on the
default spatial spring, and the label fades on the effects one; reduced
motion swaps outright through the motion tokens. The label is clipped, not
removed, so the collapsed FAB keeps its accessible name.

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 07:15:56 +02:00
co-authored by Claude Opus 5
parent 44ae9ecea4
commit 7e4e7b44c6
7 changed files with 179 additions and 2 deletions
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resources/boost/skills/livewire-material-development/SKILL.md
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@@ -321,6 +321,8 @@ Attributes go to the leading button; the slot is the menu. `variant` (`filled` d
`<x-fab icon="add" tooltip="New share" />` — `size` `sm` 56px (default), `md` 80px, `lg` 96px; with `label` it is an extended FAB. The glyph is filled, as M3 requires of a FAB. `color` `primary`/`secondary`/`tertiary`, drawn in the container, or `variant="filled"`. It does not position itself; wrap it (`<div class="fixed end-4 bottom-4 large:end-6 large:bottom-6">` — M3's 16dp margin, 24dp from `large`). `link`, `external`, `type`. There is no `disabled`: M3 says to remove a FAB whose action is unavailable, so hide it instead. `data-fab` on the root lets a place restyle a nested FAB (a rail flattens it to elevation 0).
`collapse-on-scroll` on an extended FAB with an `icon` (`<x-fab icon="edit" label="Compose" collapse-on-scroll />`) is M3's scroll behaviour: it shrinks to the FAB of its size while the window scrolls down and extends again on scroll-up or at the top of the page. The width morphs on the spatial spring and the label fades; under reduced motion it swaps outright. The label stays in the page, clipped, so the collapsed FAB keeps its accessible name. It watches the window, so it is for a FAB pinned over a scrolling page, not one inside a scrolling pane.
### `<x-fab-menu>`, `<x-fab-menu-item>`
```blade