Let the navigation bar hide on a scroll down

Plan step 25 (navigation Missing): M3's "hides on scroll-down, reappears on
scroll-up" had no implementation. `<x-navigation-bar hide-on-scroll>` slides the
bar out on the default spatial spring — an instant swap under reduced motion,
which zeroes the duration token — and never while a snackbar, a bottom sheet or
a drawer is anchored to its edge; focus reaching the bar brings it back.
`<x-app-shell hide-bar-on-scroll>` picks it, and --material-bottom-bar follows
the bar down and up so a `fab` button and the snackbar keep their offsets.

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 06:36:57 +02:00
co-authored by Claude Fable 5.1
parent 4d00d87cd2
commit ce1cd6eec0
8 changed files with 167 additions and 11 deletions
@@ -30,6 +30,18 @@
</div>
</div>
<div class="max-w-[25rem] space-y-2">
<p class="type-label-lg text-on-surface-variant">Hide on scroll: scroll the page down, then up</p>
<div class="flex h-56 flex-col overflow-hidden rounded-corner-lg border border-outline-variant bg-surface">
<div class="flex-1 p-4 type-body-md text-on-surface-variant">The bar follows the window's scrolling, not this box's: scroll the showcase down and it leaves, scroll up and it springs back. It stays while a snackbar or a bottom sheet is on screen.</div>
<x-navigation-bar hide-on-scroll>
<x-navigation-bar-item label="Shares" icon="folder_shared" link="#navigation" no-wire-navigate active />
<x-navigation-bar-item label="Upload" icon="upload" link="#navigation" no-wire-navigate />
<x-navigation-bar-item label="Inbox" icon="inbox" link="#navigation" no-wire-navigate badge="3" />
</x-navigation-bar>
</div>
</div>
<div class="max-w-[50rem] space-y-2">
<p class="type-label-lg text-on-surface-variant">Tall (80px): icon over label whatever the width</p>
<div class="overflow-x-auto rounded-corner-lg border border-outline-variant">