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Give a bottom sheet M3's preset heights

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Plan step 23, containment.md § Missing ("Bottom sheets: preset heights
and the handle's cycle-through-heights behaviour"). `heights` (or `snap`,
which is 25/50/90dvh) lists the stops a sheet moves between; it then
takes its stop's height and opens at the stop that equals `height`, or at
the first. Fewer than two stops is no stops, since M3 only requires the
non-drag alternative "if multiple preset heights exist".

That alternative is the drag handle, which M3 names a button: activating
it moves to the next stop and announces it in a live region, and from the
last stop it closes the sheet — M3's "selecting the drag handle toggles
preset heights or closes the sheet", and the same thing a handle with no
stops has always done. A drag now runs the sheet's height with the
pointer and settles on the nearest stop, or closes below the smallest one
or on a downward flick.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
This commit is contained in:
Andreas Reinhold / reini
2026-09-14 06:42:37 +02:00
co-authored by Claude Fable 5.1
parent 07759cd664
commit 944431668d
5 changed files with 252 additions and 15 deletions
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resources/boost/skills/livewire-material-development/SKILL.md
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@@ -494,7 +494,9 @@ An M3 side sheet, bound like `<x-modal>`; `close()` in scope. Props: `title`, `s
### `<x-bottom-sheet>`
An M3 bottom sheet, bound like `<x-modal>`: modal by default (scrim, inert page, drag the handle down or press Escape to close), `standard` for one that is part of the page. Props: `title`, `height` (`50dvh` — M3 caps a modal sheet's initial position at half the screen; whatever you pass is held under a ceiling of the screen less M3's 72dp top margin), `actions` slot.
An M3 bottom sheet, bound like `<x-modal>`: modal by default (scrim, inert page, drag the handle down or press Escape to close), `standard` for one that is part of the page. Props: `title`, `height` (`50dvh` — M3 caps a modal sheet's initial position at half the screen; whatever you pass is held under a ceiling of the screen less M3's 72dp top margin), `heights`/`snap`, `actions` slot.
`heights` gives it M3's **preset heights** — `heights="25dvh,50dvh,90dvh"`, `:heights="[25, 50, 90]"` (a bare number is `dvh`) or a JSON list; `snap` is the shorthand for those three. The sheet then takes its stop's height and opens at the stop that equals `height`, or at the first. The drag handle is the height control M3 requires beside the drag: activating it (press, Enter, Space) moves to the next stop and announces it, and from the last stop it closes the sheet; dragging settles on the nearest stop, or closes below the smallest. Fewer than two stops is no stops — use `height` for a single height.
### `<x-carousel>`, `<x-carousel-item>`