Animate library tabs, rows, editor track lists, status badges and dropzone

Tabs get a sliding indicator that persists across library routes, grid rows flip and collapse on removal, the selection bar and filters crossfade, album tracks move between lists with a crossfade, processing badges pulse and the dropzone scales while dragging.

web-player/scripts/check-tokens.mjs

@@ -15,6 +15,7 @@ const ARBITRARY_WHITELIST = [
 	/^my-\[\d+d?vh\]$/, // +error.svelte: centrado vertical de página de error
 	/^py-\[\d+d?vh\]$/, // Explorar: centrado vertical de "sin resultados"
 	/^transition-\[filter\]$/, // Explorar: genre-tile hover
+	/^transition-\[transform,width\]$/, // Tabs: indicador deslizante
 	/^bg-\[image:var\(--mf-[\w-]+\)\]$/
 ];
 

web-player/src/lib/components/music/TrackStatusBadge.svelte

@@ -13,4 +13,9 @@
 	const info = $derived(TRACK_STATUS[status]);
 </script>
 
-<StatusBadge label={info.label} tone={info.tone} class={klass} />
+<StatusBadge
+	label={info.label}
+	tone={info.tone}
+	pulse={status === 'Processing' || status === 'Pending'}
+	class={klass}
+/>

web-player/src/lib/components/music/library/AlbumTrackPicker.svelte

@@ -4,6 +4,7 @@
 	import X from '@lucide/svelte/icons/x';
 	import type { LibraryTrack } from '$lib/types';
 	import { plural } from '$lib/utils/format';
+	import { transferBetweenLists } from '$lib/utils/transitions';
 	import EmptyState from '$lib/components/ui/primitives/EmptyState.svelte';
 	import TrackPickList from './TrackPickList.svelte';
 
@@ -14,6 +15,8 @@
 
 	let { tracks, memberIds }: Props = $props();
 
+	const [send, receive] = transferBetweenLists();
+
 	let currentIds = $state<string[]>(untrack(() => [...memberIds]));
 
 	const initialIds = untrack(() => new Set(memberIds));
@@ -43,13 +46,13 @@
 
 	{#if available.length > 0}
 		<h3 class="mt-6 mb-2 px-3 text-eyebrow text-fg-2">Añadir desde tu biblioteca</h3>
-		<TrackPickList tracks={available} icon={Plus} onPick={add} />
+		<TrackPickList tracks={available} icon={Plus} {send} {receive} onPick={add} />
 	{/if}
 
 	<div class="mt-6">
 		{#if inAlbum.length > 0}
 			<h3 class="mb-2 px-3 text-eyebrow text-fg-2">En este álbum</h3>
-			<TrackPickList tracks={inAlbum} icon={X} onPick={remove} />
+			<TrackPickList tracks={inAlbum} icon={X} {send} {receive} onPick={remove} />
 		{:else}
 			<EmptyState
 				title="Este álbum aún no tiene canciones"

web-player/src/lib/components/music/library/LibraryTracksSection.svelte

@@ -1,4 +1,9 @@
+<script lang="ts" module>
+	const FADE = { duration: 200 };
+</script>
+
 <script lang="ts">
+	import { fade } from 'svelte/transition';
 	import Upload from '@lucide/svelte/icons/upload';
 	import Music from '@lucide/svelte/icons/music';
 	import SearchX from '@lucide/svelte/icons/search-x';
@@ -64,16 +69,22 @@
 {/if}
 
 {#if tracks.length > 0}
+	<div class="mt-4 grid">
 		{#if selectedIds.length > 0}
+			<div class="col-start-1 row-start-1" in:fade={FADE} out:fade={FADE}>
 				<SelectionBar
-			class="mt-4"
 					label={plural(selectedIds.length, 'seleccionada', 'seleccionadas')}
 					onClear={() => (selectedIds = [])}
 				>
 					<Button size="sm" variant="danger" onclick={deleteSelected}>Borrar</Button>
 				</SelectionBar>
+			</div>
 		{:else}
-		<div class="mt-4 flex min-h-11 flex-wrap items-center gap-x-4 gap-y-3">
+			<div
+				class="col-start-1 row-start-1 flex min-h-11 flex-wrap items-center gap-x-4 gap-y-3"
+				in:fade={FADE}
+				out:fade={FADE}
+			>
 				<SearchInput
 					bind:value={query}
 					placeholder="Filtrar por título o artista"
@@ -83,6 +94,7 @@
 				<ChipGroup label="Filtrar por estado" options={filterOptions} bind:value={filter} />
 			</div>
 		{/if}
+	</div>
 
 	{#if visible.length > 0}
 		<ManageTrackList

web-player/src/lib/components/music/library/ManageTrackList.svelte

@@ -62,6 +62,7 @@
 	columns={COLUMNS}
 	rows={tracks}
 	rowKey={(track) => track.id}
+	stagger
 	rowClass={(track) => (player.currentId === track.id ? 'surface-active' : 'hover:bg-hover')}
 >
 	{#snippet head()}

web-player/src/lib/components/music/library/TrackPickList.svelte

@@ -1,15 +1,22 @@
 <script lang="ts">
 	import type { LucideIcon } from '@lucide/svelte';
+	import { flip } from 'svelte/animate';
+	import { expoOut } from 'svelte/easing';
 	import type { LibraryTrack } from '$lib/types';
+	import type { transferBetweenLists } from '$lib/utils/transitions';
 	import ListRow from '$lib/components/ui/media/ListRow.svelte';
 
+	type Transfer = ReturnType<typeof transferBetweenLists>;
+
 	interface Props {
 		tracks: LibraryTrack[];
 		icon: LucideIcon;
+		send: Transfer[0];
+		receive: Transfer[1];
 		onPick: (track: LibraryTrack) => void;
 	}
 
-	let { tracks, icon: Icon, onPick }: Props = $props();
+	let { tracks, icon: Icon, send, receive, onPick }: Props = $props();
 
 	function subtitle(track: LibraryTrack): string {
 		const album = track.albumTitle ? `en ${track.albumTitle}` : 'Sin álbum';
@@ -19,7 +26,12 @@
 
 <div class="flex flex-col gap-px" role="list">
 	{#each tracks as track (track.id)}
-		<div role="listitem">
+		<div
+			role="listitem"
+			animate:flip={{ duration: 200, easing: expoOut }}
+			in:receive|global={{ key: track.id }}
+			out:send|global={{ key: track.id }}
+		>
 			<ListRow
 				size="xs"
 				trackId={track.id}

web-player/src/lib/components/ui/forms/FileDropzone.svelte

@@ -71,7 +71,7 @@
 	ondragleave={onLeave}
 	ondrop={onDrop}
 	class="flex min-h-dropzone flex-col items-center justify-center rounded-panel border border-dashed p-6 text-center transition sm:p-10 {dragging
-		? 'border-accent/60 bg-accent-tint'
+		? 'scale-101 border-accent/60 bg-accent-tint'
 		: 'border-line-strong bg-surface'} {klass}"
 >
 	<span class="grid size-14 place-items-center rounded-full bg-surface-2 text-fg-2">

web-player/src/lib/components/ui/media/DataGrid.svelte

@@ -4,6 +4,9 @@
 
 <script lang="ts" generics="T">
 	import type { Snippet } from 'svelte';
+	import { flip } from 'svelte/animate';
+	import { expoOut } from 'svelte/easing';
+	import { collapse } from '$lib/utils/transitions';
 	import { gridColumns, type GridColumn } from '$lib/utils/gridColumns';
 
 	interface Props {
@@ -15,6 +18,7 @@
 		rowClass?: (row: T, index: number) => string;
 		oncontextmenu?: (event: MouseEvent, row: T, index: number) => void;
 		gap?: 'md' | 'lg';
+		stagger?: boolean;
 		class?: string;
 	}
 
@@ -27,6 +31,7 @@
 		rowClass,
 		oncontextmenu,
 		gap = 'md',
+		stagger = false,
 		class: klass = ''
 	}: Props = $props();
 
@@ -60,10 +65,12 @@
 		{#each rows as row, i (rowKey(row))}
 			<div
 				role="listitem"
+				animate:flip={{ duration: 200, easing: expoOut }}
+				out:collapse
 				class="group grid track-grid items-center gap-3 rounded-control py-3 pr-4 pl-2 transition-colors sm:pr-6 sm:pl-3 {GAP[
 					gap
-				]} {rowClass?.(row, i) ?? ''}"
-				{style}
+				]} {stagger ? 'animate-enter' : ''} {rowClass?.(row, i) ?? ''}"
+				style="{style}{stagger ? `; --i:${i}` : ''}"
 				oncontextmenu={oncontextmenu ? (event) => oncontextmenu(event, row, i) : undefined}
 			>
 				{#each columns as column (column.id)}

web-player/src/lib/components/ui/media/StatusBadge.svelte

@@ -2,10 +2,11 @@
 	interface Props {
 		label: string;
 		tone?: 'success' | 'neutral' | 'danger';
+		pulse?: boolean;
 		class?: string;
 	}
 
-	let { label, tone = 'neutral', class: klass = '' }: Props = $props();
+	let { label, tone = 'neutral', pulse = false, class: klass = '' }: Props = $props();
 
 	const TONE = {
 		success: 'bg-accent-tint text-accent-soft',
@@ -15,7 +16,7 @@
 </script>
 
 <span
-	class="inline-flex items-center rounded-full px-2.5 py-1 text-xs font-medium whitespace-nowrap {TONE[
-		tone
-	]} {klass}">{label}</span
+	class="inline-flex items-center rounded-full px-2.5 py-1 text-xs font-medium whitespace-nowrap {pulse
+		? 'animate-pulse'
+		: ''} {TONE[tone]} {klass}">{label}</span
 >

web-player/src/lib/components/ui/primitives/Tabs.svelte

@@ -12,16 +12,43 @@
 	}
 
 	let { label, tabs, class: klass = '' }: Props = $props();
+
+	let links = $state<Record<string, HTMLAnchorElement | undefined>>({});
+	let indicator = $state({ x: 0, width: 0 });
+	let measured = $state(false);
+	let animated = $state(false);
+
+	const activeHref = $derived(tabs.find((tab) => tab.active)?.href);
+
+	$effect(() => {
+		const link = activeHref ? links[activeHref] : undefined;
+		if (!link) return;
+		indicator = { x: link.offsetLeft, width: link.offsetWidth };
+		measured = true;
+		if (!animated) requestAnimationFrame(() => (animated = true));
+	});
 </script>
 
-<nav aria-label={label} class="flex gap-2 {klass}">
+<nav
+	aria-label={label}
+	class="relative inline-flex max-w-full rounded-full bg-surface-2 p-1 {klass}"
+>
+	{#if measured}
+		<div
+			class="absolute inset-y-1 left-0 rounded-full bg-fg ease-snappy {animated
+				? 'transition-[transform,width] duration-200'
+				: ''}"
+			style="width:{indicator.width}px; transform:translateX({indicator.x}px)"
+		></div>
+	{/if}
 	{#each tabs as tab (tab.href)}
 		<a
+			bind:this={links[tab.href]}
 			href={tab.href}
 			aria-current={tab.active ? 'page' : undefined}
-			class="rounded-full px-4 py-1.5 text-xs font-medium focus-ring transition-colors {tab.active
-				? 'bg-fg text-ink'
-				: 'bg-surface-2 text-fg-2 hover:text-fg'}"
+			class="relative z-(--z-raised) rounded-full px-4 py-1.5 text-xs font-medium focus-ring transition-colors {tab.active
+				? 'text-ink'
+				: 'text-fg-2 hover:text-fg'}"
 		>
 			{tab.label}
 		</a>

web-player/src/lib/utils/transitions.ts

@@ -1,5 +1,5 @@
 import { expoOut } from 'svelte/easing';
-import type { TransitionConfig } from 'svelte/transition';
+import { crossfade, type TransitionConfig } from 'svelte/transition';
 
 export function pop(
 	node: Element,
@@ -12,3 +12,23 @@ export function pop(
 			`opacity: ${t}; transform: scale(${0.98 + 0.02 * t}) translateY(${0.25 * (1 - t)}rem);`
 	};
 }
+
+export function collapse(
+	node: Element,
+	{ duration = 200 }: { duration?: number } = {}
+): TransitionConfig {
+	const height = node.getBoundingClientRect().height;
+	const style = getComputedStyle(node);
+	const paddingTop = parseFloat(style.paddingTop);
+	const paddingBottom = parseFloat(style.paddingBottom);
+	return {
+		duration,
+		easing: expoOut,
+		css: (t) =>
+			`overflow: hidden; opacity: ${t}; height: ${height * t}px; padding-top: ${paddingTop * t}px; padding-bottom: ${paddingBottom * t}px;`
+	};
+}
+
+export function transferBetweenLists() {
+	return crossfade({ duration: 200, easing: expoOut });
+}

web-player/src/routes/(app)/+layout.svelte

@@ -27,6 +27,12 @@
 
 	let scroller = $state<HTMLElement>();
 
+	const transitionKey = $derived(
+		page.url.pathname === '/library' || page.url.pathname.startsWith('/library/')
+			? '/library'
+			: page.url.pathname
+	);
+
 	trackNavigation();
 	restoreScroll(() => scroller);
 
@@ -81,7 +87,7 @@
 				<MobileHeader user={data.user} accountUrl={data.accountUrl} />
 				<TopBar user={data.user} accountUrl={data.accountUrl} />
 				<main class="flex-1">
-					{#key page.url.pathname}
+					{#key transitionKey}
 						<div class="animate-fade">{@render children()}</div>
 					{/key}
 				</main>

web-player/src/routes/(app)/library/+layout.svelte

@@ -47,5 +47,7 @@
 <Page>
 	<PageHeader title="Gestionar música" description={current.description} />
 	<Tabs label="Secciones de la biblioteca" {tabs} />
-	{@render children()}
+	{#key page.url.pathname}
+		<div class="animate-fade">{@render children()}</div>
+	{/key}
 </Page>

web-player/src/routes/(app)/library/albums/[id]/+page.svelte

@@ -6,7 +6,7 @@
 	let { data, form } = $props();
 </script>
 
-<div class="mt-4">
+<div class="animate-enter mt-4">
 	{#key data.album.id}
 		<LibraryAlbumEditor
 			album={data.album}

web-player/src/routes/(app)/library/albums/new/+page.svelte

@@ -6,7 +6,7 @@
 	let { data, form } = $props();
 </script>
 
-<div class="mt-4">
+<div class="animate-enter mt-4">
 	<LibraryAlbumEditor
 		album={null}
 		artist={page.data.user?.name ?? ''}