Add label to timeline marker with current time.

src/components/timeline-core.ts

@@ -19,7 +19,7 @@ import isEqual from 'lodash-es/isEqual';
 import throttle from 'lodash-es/throttle';
 import { ViewContext } from 'view';
 import { DataSet } from 'vis-data/esnext';
-import type { DataGroupCollectionType, IdType } from 'vis-timeline/esnext';
+import type { DataGroupCollectionType, DateType, IdType } from 'vis-timeline/esnext';
 import {
   Timeline,
   TimelineEventPropertiesResult,
@@ -46,6 +46,7 @@ import { stopEventFromActivatingCardWideActions } from '../utils/action';
 import {
   contentsChanged,
   dispatchFrigateCardEvent,
+  formatDateAndTime,
   isHoverableDevice,
   setOrRemoveAttribute,
 } from '../utils/basic';
@@ -89,6 +90,11 @@ declare module 'view' {
   }
 }
 
+interface ExtendedTimeline extends Timeline {
+  // setCustomTimeMarker currently missing from Timeline types.
+  setCustomTimeMarker?(time: DateType, id?: IdType): void;
+}
+
 // An event used to fetch data required for thumbnail rendering. See special
 // note below on why this is necessary.
 interface ThumbnailDataRequest {
@@ -206,8 +212,7 @@ export class FrigateCardTimelineCore extends LitElement {
 
   protected _refDatePicker: Ref<FrigateCardDatePicker> = createRef();
   protected _refTimeline: Ref<HTMLElement> = createRef();
-
-  protected _timeline?: Timeline;
+  protected _timeline?: ExtendedTimeline;
 
   protected _timelineSource: TimelineDataSource | null = null;
 
@@ -417,6 +422,22 @@ export class FrigateCardTimelineCore extends LitElement {
       } else {
         this._timeline?.setCustomTime(targetTime, TIMELINE_TARGET_BAR_ID);
       }
+
+      const window = this._timeline.getWindow();
+      const markerProportion =
+        (targetTime.getTime() - window.start.getTime()) /
+        (window.end.getTime() - window.start.getTime());
+
+      // Position the marker proportionally to how 'far' the pointer is being
+      // held relative to the timeline window.
+      this.setAttribute(
+        'target-bar-marker-direction',
+        markerProportion < 0.25 ? 'right' : markerProportion > 0.75 ? 'left' : 'center',
+      );
+      this._timeline?.setCustomTimeMarker?.(
+        formatDateAndTime(targetTime, true),
+        TIMELINE_TARGET_BAR_ID,
+      );
     } else {
       this._removeTargetBar();
     }
@@ -426,6 +447,7 @@ export class FrigateCardTimelineCore extends LitElement {
    * Remove the target bar.
    */
   protected _removeTargetBar(): void {
+    this.removeAttribute('target-bar-direction');
     if (this._targetBarVisible) {
       this._timeline?.removeCustomTime(TIMELINE_TARGET_BAR_ID);
       this._targetBarVisible = false;
@@ -463,12 +485,7 @@ export class FrigateCardTimelineCore extends LitElement {
         : results
             .clone()
             .resetSelectedResult()
-            .selectBestResult((media) =>
-              findBestMediaIndex(
-                media,
-                targetTime,
-              ),
-            );
+            .selectBestResult((media) => findBestMediaIndex(media, targetTime));
 
     const desiredView: FrigateCardView = this.mini
       ? targetTime >= new Date()

src/scss/timeline-core.scss

@@ -144,13 +144,30 @@ div.vis-tooltip {
 }
 
 .target_bar {
-  border-left: 2px solid var(--primary-color);
-  opacity: 0.7;
-  box-shadow: var(--frigate-card-css-box-shadow, 0px 0px 3px 1px var(--primary-color));
+  background-color: var(--primary-color);
+  width: 2px;
+
+  z-index: 20;
 
   // Prevent the mouse interacting with the custom time.
   pointer-events: none;
 }
+.target_bar .vis-custom-time-marker {
+  background-color: var(--primary-background-color);
+  color: var(--primary-text-color);
+  bottom: 0px;
+  top: unset;
+}
+:host([target-bar-marker-direction='right']) .target_bar .vis-custom-time-marker {
+  left: 2px;
+}
+:host([target-bar-marker-direction='left']) .target_bar .vis-custom-time-marker {
+  right: 2px;
+}
+:host([target-bar-marker-direction='center']) .target_bar .vis-custom-time-marker {
+  left: 0px;
+  transform: translateX(-50%);
+}
 
 .timeline-tools {
   position: absolute;

src/utils/basic.ts

@@ -114,8 +114,8 @@ export const isHoverableDevice = (): boolean =>
  * @param date A Date object.
  * @returns A date and time.
  */
-export const formatDateAndTime = (date: Date): string => {
-  return format(date, 'yyyy-MM-dd HH:mm');
+export const formatDateAndTime = (date: Date, includeSeconds?: boolean): string => {
+  return format(date, `yyyy-MM-dd HH:mm${includeSeconds ? ':ss' : ''}`);
 };
 
 /**

tests/basic.test.ts

@@ -17,6 +17,7 @@ import {
   prettifyTitle,
   runWhenIdleIfSupported,
   setify,
+  setOrRemoveAttribute,
   sleep,
 } from '../src/utils/basic';
 
@@ -131,6 +132,10 @@ describe('formatDateAndTime', () => {
     const date = new Date(2023, 3, 14, 13, 35, 0);
     expect(formatDateAndTime(date)).toBe('2023-04-14 13:35');
   });
+  it('should format date and time with seconds', () => {
+    const date = new Date(2023, 3, 14, 13, 35, 1);
+    expect(formatDateAndTime(date, true)).toBe('2023-04-14 13:35:01');
+  });
 });
 
 describe('formatDate', () => {
@@ -220,3 +225,18 @@ describe('isValidDate', () => {
     expect(isValidDate(new Date('moo'))).toBeFalsy();
   });
 });
+
+describe('setOrRemoveAttribute', () => {
+  it('should set attribute', () => {
+    const element = document.createElement('div');
+    setOrRemoveAttribute(element, true, 'key', 'value');
+    expect(element.getAttribute('key')).toBe('value');
+  });
+
+  it('should remove attribute date', () => {
+    const element = document.createElement('div');
+    element.setAttribute('key', 'value');
+    setOrRemoveAttribute(element, false, 'key');
+    expect(element.getAttribute('key')).toBeFalsy();
+  });
+});