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Fade a bottom sheet's scrim out, and keep a nested sheet's state

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Plan step 36 review of 287340b0. The scrim had no closed opacity, so
allow-discrete held it at full strength for the length of the fade and
then dropped it, where x-transition.opacity had faded it out. The open
state now matches the root's own scrim and panel: a sheet nested in an
open one (a menu's sheet at compact inside a sheet) matched the outer
open rule, and closed in place after half a second instead of sliding.
The handle's ring stands 4px off its bar again, as the old handle's
outline-offset-4 drew it.

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 22:04:50 +02:00
co-authored by Claude Opus 5
parent b6259d45f3
commit 0093671bf3
2 changed files with 28 additions and 5 deletions
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resources/css/components/bottom-sheet.css
+18 -5
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@@ -26,7 +26,11 @@
* The grip button draws the shared `md-focus-ring` and `md-touch-target` classes rather than a
* hand-rolled ring: its own visible bar is not a smaller indicator drawn inside a bigger box those
* classes cannot reach (unlike the datepicker's day) — the box they draw *is* the button's whole
* hit area, so nothing here refines them further.
* hit area. The one refinement is the ring's offset, 4px rather than 2px, as the old handle drew
* it: 2px from a 4px-tall bar leaves the ring hard to tell from the bar.
*
* The scrim fades out as it fades in, and the state rules match the root's own scrim and panel,
* so a sheet nested in an open one (a menu's sheet at compact inside a sheet) keeps its own state.
*/
@layer material.reset, material.tokens, material.base, material.layout, material.components, material.text, material.visibility;
@@ -37,14 +41,19 @@
inset: 0;
z-index: 40;
background-color: color-mix(in srgb, var(--md-sys-color-scrim) 32%, transparent);
opacity: 0;
transition-property: opacity, display;
transition-duration: var(--md-sys-motion-effects-default-duration);
transition-timing-function: var(--md-sys-motion-effects-default);
transition-behavior: allow-discrete;
}
[data-md-bottom-sheet][data-md-open] > [data-md-bottom-sheet-scrim] {
opacity: 1;
}
@starting-style {
[data-md-bottom-sheet-scrim] {
[data-md-bottom-sheet][data-md-open] > [data-md-bottom-sheet-scrim] {
opacity: 0;
}
}
@@ -82,14 +91,14 @@
transition-behavior: allow-discrete;
}
[data-md-bottom-sheet][data-md-open] [data-md-bottom-sheet-panel] {
[data-md-bottom-sheet][data-md-open] > [data-md-bottom-sheet-panel] {
translate: 0 0;
transition-duration: var(--md-sys-motion-spatial-default-duration);
transition-timing-function: var(--md-sys-motion-easing-emphasized-decelerate);
}
@starting-style {
[data-md-bottom-sheet][data-md-open] [data-md-bottom-sheet-panel] {
[data-md-bottom-sheet][data-md-open] > [data-md-bottom-sheet-panel] {
translate: 0 100%;
}
}
@@ -103,7 +112,7 @@
transition-timing-function: var(--md-sys-motion-easing-emphasized-accelerate), var(--md-sys-motion-spatial-default), var(--md-sys-motion-easing-emphasized-accelerate);
}
[data-md-bottom-sheet][data-md-open] [data-md-bottom-sheet-panel][data-md-preset] {
[data-md-bottom-sheet][data-md-open] > [data-md-bottom-sheet-panel][data-md-preset] {
transition-duration: var(--md-sys-motion-spatial-default-duration), var(--md-sys-motion-spatial-default-duration), var(--md-sys-motion-spatial-default-duration);
transition-timing-function: var(--md-sys-motion-easing-emphasized-decelerate), var(--md-sys-motion-spatial-default), var(--md-sys-motion-easing-emphasized-decelerate);
}
@@ -127,6 +136,10 @@
background-color: var(--md-sys-color-on-surface-variant);
}
[data-md-bottom-sheet-grip]:focus-visible {
outline-offset: 4px;
}
[data-md-bottom-sheet-body] {
min-height: 0;
flex: 1 1 0%;