Put the menu on M3's Expressive spacing and behaviour

Items were 44px tall with the baseline menu's 12px sides, the separator had half
its 8dp padding, a disabled item was skipped by the keyboard entirely, a chosen
item was told by colour and shape alone, and the list simply faded in place. Now:
48px rows with 16px either side, an 8px separator, disabled items focusable but
never activatable, a trailing check on a selected item, and an enter-exit that
scales the list out of the corner nearest its trigger — the scale on the spatial
spring, the fade on the effects one. Plan step 18, actions.md ACT-11, ACT-12,
ACT-13, ACT-26, ACT-27, ACT-28.

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
2026-09-14 06:04:03 +02:00
co-authored by Claude Opus 5
parent 429be9b64f
commit 9828c9258a
8 changed files with 83 additions and 22 deletions
+32 -2
View File
@@ -15,8 +15,14 @@
* `state-transition-default` is the same pair one step slower, for the bigger morph of a FAB
* turning into a close button.
*
* Unlayered, as the rest of the package's component CSS, so a `transition-*` utility on the call
* site cannot half-undo one.
* `popover-transition` is the enter and exit of a menu: M3 asks for a transition that ties the
* list to its trigger, so it scales up from its `transform-origin` on the spatial spring while it
* fades in on the effects one, and `allow-discrete` keeps `display` and `overlay` alive long
* enough for the exit to be seen.
*
* These are `@utility` declarations, so they compile into Tailwind's utilities layer like any
* other class: a `transition-*` utility written beside one on the call site will fight it, and
* whichever Tailwind emits last wins. Pass neither.
*/
@utility state-transition-fast {
@@ -38,3 +44,27 @@
var(--md-sys-motion-spatial-default), var(--md-sys-motion-spatial-default), var(--md-sys-motion-spatial-default),
var(--md-sys-motion-effects-default), var(--md-sys-motion-effects-default), var(--md-sys-motion-effects-default);
}
@utility popover-transition {
opacity: 0;
scale: 0.95;
transition-property: opacity, scale, display, overlay;
transition-duration:
var(--md-sys-motion-effects-fast-duration), var(--md-sys-motion-spatial-fast-duration),
var(--md-sys-motion-spatial-fast-duration), var(--md-sys-motion-spatial-fast-duration);
transition-timing-function:
var(--md-sys-motion-effects-fast), var(--md-sys-motion-spatial-fast), linear, linear;
transition-behavior: allow-discrete;
&:popover-open {
opacity: 1;
scale: 1;
}
@starting-style {
&:popover-open {
opacity: 0;
scale: 0.95;
}
}
}