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fix(diashow): working transitions + slide/push, fullscreen, activity controls

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Transitions never actually animated: Svelte scopes @keyframes names but does NOT
rewrite animation references in inline style attributes, so the inline
'animation: crossfade-in ...' never matched its scoped keyframe — a hard cut, no fade
(Ken Burns' zoom was dead too). Move the animation into scoped classes and pass dynamic
values via CSS custom properties.

- Real two-layer crossfade: hold the outgoing frame opaque beneath the incoming one
  (which is decode-gated), so there's no black flash and no decode pop.
- New slide transitions (from below/left/right) as one reusable component; the previous
  frame is pushed off the opposite edge in step (a conveyor/push), easeInOutSine 1s.
- Fullscreen toggle button (Fullscreen API) + 'f' shortcut; Esc in fullscreen no longer
  also navigates away.
- Controls now reveal on pointer/keyboard activity and fade when idle (cursor hides too)
  instead of being always visible.
- wakelock: null the sentinel on the OS 'release' event so re-acquire-on-visible
  actually fires (previously the screen could sleep after the tab was first hidden).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-07-19 15:22:15 +02:00
parent 44641473ea
commit 4026648f98
6 changed files with 356 additions and 40 deletions
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19
frontend/src/lib/diashow/transitions/kenburns.svelte
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@@ -18,9 +18,14 @@
const panY = Math.round((Math.random() - 0.5) * 6);
</script>
<!-- Both animations live in scoped classes rather than inline `style="animation:…"`.
Svelte scopes `@keyframes` names and only rewrites `animation` references inside this
<style> block, so an inline animation name never matches the scoped keyframe and the
effect silently dies. Dynamic values (fade duration, pan origin) pass through as inline
custom properties / properties that Svelte leaves untouched. -->
<div
class="absolute inset-0 flex items-center justify-center overflow-hidden bg-black"
style="animation: kb-fade {durationMs}ms ease-out forwards;"
class="kb absolute inset-0 flex items-center justify-center overflow-hidden bg-black"
style="--fade-dur: {durationMs}ms"
>
{#if isVideo}
<!-- svelte-ignore a11y_media_has_caption -->
@@ -29,13 +34,19 @@
<img
{src}
alt=""
class="h-full w-full object-cover"
style="animation: kb-zoom 10s ease-out forwards; transform-origin: {50 + panX}% {50 + panY}%;"
class="kb-img h-full w-full object-cover"
style="transform-origin: {50 + panX}% {50 + panY}%;"
/>
{/if}
</div>
<style>
.kb {
animation: kb-fade var(--fade-dur, 600ms) ease-out forwards;
}
.kb-img {
animation: kb-zoom 10s ease-out forwards;
}
@keyframes kb-fade {
from {
opacity: 0;