feat(web): scrubber label and animation (#13815)

* feat(web): scrubber label and animation

* tune x fly in distance

* refactor

* lint and minor fix

* fly height

web/src/lib/components/photos-page/asset-grid.svelte

@@ -36,6 +36,7 @@
   import { page } from '$app/stores';
   import type { UpdatePayload } from 'vite';
   import { generateId } from '$lib/utils/generate-id';
+  import { isTimelineScrolling } from '$lib/stores/timeline.store';
 
   export let isSelectionMode = false;
   export let singleSelect = false;
@@ -331,7 +332,17 @@
     }
   };
 
+  let scrollObserverTimer: NodeJS.Timeout;
+
   const _handleTimelineScroll = () => {
+    $isTimelineScrolling = true;
+    if (scrollObserverTimer) {
+      clearTimeout(scrollObserverTimer);
+    }
+    scrollObserverTimer = setTimeout(() => {
+      $isTimelineScrolling = false;
+    }, 1000);
+
     leadout = false;
     if ($assetStore.timelineHeight < safeViewport.height * 2) {
       // edge case - scroll limited due to size of content, must adjust -  use the overall percent instead

web/src/lib/components/shared-components/scrubber/scrubber.svelte

@@ -1,9 +1,12 @@
 <script lang="ts">
   import type { AssetStore, AssetBucket, BucketListener } from '$lib/stores/assets.store';
-  import type { DateTime } from 'luxon';
+  import { DateTime } from 'luxon';
   import { fromLocalDateTime, type ScrubberListener } from '$lib/utils/timeline-util';
   import { clamp } from 'lodash-es';
   import { onMount } from 'svelte';
+  import { isTimelineScrolling } from '$lib/stores/timeline.store';
+  import { parseUtcDate } from '$lib/utils/date-time';
+  import { fly } from 'svelte/transition';
 
   export let timelineTopOffset = 0;
   export let timelineBottomOffset = 0;
@@ -72,6 +75,7 @@
   $: timelineFullHeight = $assetStore.timelineHeight + timelineTopOffset + timelineBottomOffset;
   $: relativeTopOffset = toScrollY(timelineTopOffset / timelineFullHeight);
   $: relativeBottomOffset = toScrollY(timelineBottomOffset / timelineFullHeight);
+  $: formatedDate = scrubBucket?.bucketDate ? parseUtcDate(scrubBucket?.bucketDate).toFormat('MMM yyyy') : '';
 
   const listener: BucketListener = (event) => {
     const { type } = event;
@@ -210,8 +214,9 @@
 <!-- svelte-ignore a11y-no-static-element-interactions -->
 
 <div
+  transition:fly={{ x: 50, duration: 250 }}
   id="immich-scrubbable-scrollbar"
-  class={`absolute right-0 z-[1] select-none bg-immich-bg hover:cursor-row-resize`}
+  class="absolute right-0 z-[1] select-none bg-immich-bg hover:cursor-row-resize"
   style:padding-top={HOVER_DATE_HEIGHT + 'px'}
   style:padding-bottom={HOVER_DATE_HEIGHT + 'px'}
   class:invisible
@@ -235,9 +240,20 @@
   <!-- Scroll Position Indicator Line -->
   {#if !isDragging}
     <div
-      class="absolute right-0 h-[2px] w-10 bg-immich-primary dark:bg-immich-dark-primary"
+      class="absolute right-0 {$isTimelineScrolling && formatedDate
+        ? 'h-[0px]'
+        : 'h-[2px]'}  w-10 bg-immich-primary dark:bg-immich-dark-primary"
       style:top="{scrollY + HOVER_DATE_HEIGHT}px"
-    />
+    >
+      {#if $isTimelineScrolling && formatedDate}
+        <p
+          transition:fly={{ y: -15, duration: 350 }}
+          class="truncate opacity-85 pointer-events-none absolute right-0 bottom-0 z-[100] min-w-20 max-w-64 w-fit rounded-tl-md border-b-2 border-immich-primary bg-immich-bg py-1 px-1 text-sm font-medium shadow-[0_0_8px_rgba(0,0,0,0.25)] dark:border-immich-dark-primary dark:bg-immich-dark-gray dark:text-immich-dark-fg"
+        >
+          {formatedDate}
+        </p>
+      {/if}
+    </div>
   {/if}
   <div id="lead-in" class="relative" style:height={relativeTopOffset + 'px'} data-label={segments.at(0)?.dateFormatted}>
     {#if relativeTopOffset > 6}

web/src/lib/stores/timeline.store.ts

@@ -0,0 +1,3 @@
+import { writable } from 'svelte/store';
+
+export const isTimelineScrolling = writable(false);