Don't render thumbnail carousel if there are no thumbnails.

src/browse-media-util.ts

@@ -67,8 +67,6 @@ export class BrowseMediaUtil {
     return index >= 0 ? index : null;
   }
   
-  // 
-
   /**
    * Browse Frigate media with a media content id. May throw.
    * @param hass The HomeAssistant object.

src/components/live.ts

@@ -1,6 +1,7 @@
 import { CSSResultGroup, LitElement, TemplateResult, html, unsafeCSS } from 'lit';
 import type {
   BrowseMediaQueryParameters,
+  BrowseMediaSource,
   ExtendedHomeAssistant,
   FrigateCardConfig,
   JSMPEGConfig,
@@ -11,6 +12,9 @@ import { HomeAssistant } from 'custom-card-helpers';
 import { customElement, property } from 'lit/decorators.js';
 import { until } from 'lit/directives/until.js';
 
+import { BrowseMediaUtil } from '../browse-media-util.js';
+import { ThumbnailCarouselTap } from './thumbnail-carousel.js';
+import { View } from '../view.js';
 import { localize } from '../localize/localize.js';
 import {
   dispatchErrorMessageEvent,
@@ -30,8 +34,6 @@ import liveFrigateStyle from '../scss/live-frigate.scss';
 import liveJSMPEGStyle from '../scss/live-jsmpeg.scss';
 import liveWebRTCStyle from '../scss/live-webrtc.scss';
 
-import { View } from '../view.js';
-import { ThumbnailCarouselTap } from './thumbnail-carousel.js';
 
 // Number of seconds a signed URL is valid for.
 const URL_SIGN_EXPIRY_SECONDS = 24 * 60 * 60;
@@ -87,6 +89,22 @@ export class FrigateCardLive extends LitElement {
     if (!this.config) {
       return;
     }
+
+    const fetchThumbnailsThenRender = async (): Promise<TemplateResult | void> => {
+      if (!this.hass || !this.browseMediaQueryParameters) {
+        return;
+      }
+      let parent: BrowseMediaSource | null;
+      try {
+        parent = await BrowseMediaUtil.browseMediaQuery(
+          this.hass,
+          this.browseMediaQueryParameters,
+        );
+      } catch (e) {
+        return dispatchErrorMessageEvent(this, (e as Error).message);
+      }
+
+      if (BrowseMediaUtil.getFirstTrueMediaChildIndex(parent) != null)  {
         return html` <frigate-card-thumbnail-carousel
           .hass=${this.hass}
           .browseMediaQueryParameters=${this.browseMediaQueryParameters}
@@ -105,6 +123,10 @@ export class FrigateCardLive extends LitElement {
         >
         </frigate-card-thumbnail-carousel>`;
       }
+    }
+
+    return html`${until(fetchThumbnailsThenRender(), renderProgressIndicator())}`;
+  }
 
   /**
    * Master render method.

src/components/thumbnail-carousel.ts

@@ -1,14 +1,11 @@
 import { BrowseMediaUtil } from '../browse-media-util.js';
-import { CSSResultGroup, TemplateResult, html, unsafeCSS, LitElement } from 'lit';
+import { CSSResultGroup, TemplateResult, html, unsafeCSS } from 'lit';
 import { customElement, property } from 'lit/decorators.js';
-import { until } from 'lit/directives/until';
 
-import type { BrowseMediaQueryParameters, BrowseMediaSource, ExtendedHomeAssistant, ThumbnailsControlConfig } from '../types.js';
+import type { BrowseMediaSource, ThumbnailsControlConfig } from '../types.js';
 import { FrigateCardCarousel } from './carousel.js';
-import { HomeAssistant } from 'custom-card-helpers';
 import { actionHandler } from '../action-handler-directive.js';
-import { dispatchErrorMessageEvent, dispatchFrigateCardEvent } from '../common.js';
+import { dispatchFrigateCardEvent } from '../common.js';
-import { renderProgressIndicator } from './message.js';
 
 import thumbnailCarouselStyle from '../scss/thumbnail-carousel.scss';
 
@@ -19,56 +16,7 @@ export interface ThumbnailCarouselTap {
 }
 
 @customElement('frigate-card-thumbnail-carousel')
-export class FrigateCardThumbnailCarousel extends LitElement {
+export class FrigateCardThumbnailCarousel extends FrigateCardCarousel {
-  @property({ attribute: false })
-  protected hass?: HomeAssistant & ExtendedHomeAssistant;
-
-  @property({ attribute: false })
-  protected browseMediaQueryParameters?: BrowseMediaQueryParameters;
-
-  @property({ attribute: false })
-  protected config?: ThumbnailsControlConfig;
-
-  @property({ attribute: false })
-  protected highlightSelected = true;
-
-  /**
-   * Master render method.
-   * @returns A rendered template.
-   */
-   protected render(): TemplateResult | void {
-    return html`${until(this._render(), renderProgressIndicator())}`;
-  }
-
-  /**
-   * Asyncronously render the element.
-   * @returns A rendered template.
-   */
-   protected async _render(): Promise<TemplateResult | void> {
-    if (!this.hass || !this.browseMediaQueryParameters) {
-      return html``;
-    }
-
-    let parent: BrowseMediaSource | null = null;
-    try {
-      parent = await BrowseMediaUtil.browseMediaQuery(
-        this.hass,
-        this.browseMediaQueryParameters,
-      );
-    } catch (e) {
-      return dispatchErrorMessageEvent(this, (e as Error).message);
-    }
-    return html` <frigate-card-thumbnail-carousel-core
-      .target=${parent}
-      .config=${this.config}
-      .highlightSelected=${this.highlightSelected}
-    >
-    </frigate-card-thumbnail-carousel-core>`;
-  }
-}
-
-@customElement('frigate-card-thumbnail-carousel-core')
-export class FrigateCardThumbnailCarouselCore extends FrigateCardCarousel {
   @property({ attribute: false })
   protected target?: BrowseMediaSource;
 

src/components/viewer.ts

@@ -16,7 +16,7 @@ import type {
   ViewerConfig,
 } from '../types.js';
 import { FrigateCardCarousel } from './carousel.js';
-import { FrigateCardThumbnailCarouselCore, ThumbnailCarouselTap } from './thumbnail-carousel.js';
+import { FrigateCardThumbnailCarousel, ThumbnailCarouselTap } from './thumbnail-carousel.js';
 import { ResolvedMediaCache, ResolvedMediaUtil } from '../resolved-media.js';
 import { View } from '../view.js';
 import { actionHandler } from '../action-handler-directive.js';
@@ -165,7 +165,7 @@ export class FrigateCardViewerCore extends LitElement {
   protected resolvedMediaCache?: ResolvedMediaCache;
 
   protected _mediaCarouselRef: Ref<FrigateCardMediaCarousel> = createRef();
-  protected _thumbnailCarouselRef: Ref<FrigateCardThumbnailCarouselCore> = createRef();
+  protected _thumbnailCarouselRef: Ref<FrigateCardThumbnailCarousel> = createRef();
 
   protected _syncThumbnailCarousel(): void {
     const mediaSelected = this._mediaCarouselRef.value?.carouselSelected();
@@ -179,7 +179,7 @@ export class FrigateCardViewerCore extends LitElement {
       return html``;
     }
 
-    return html` <frigate-card-thumbnail-carousel-core
+    return html` <frigate-card-thumbnail-carousel
       ${ref(this._thumbnailCarouselRef)}
       .target=${this.view.target}
       .config=${this.viewerConfig.controls.thumbnails}
@@ -188,7 +188,7 @@ export class FrigateCardViewerCore extends LitElement {
       }}
       @frigate-card:carousel:init=${this._syncThumbnailCarousel.bind(this)}
     >
-    </frigate-card-thumbnail-carousel-core>`;
+    </frigate-card-thumbnail-carousel>`;
   }
 
   protected render(): TemplateResult | void {

src/scss/viewer-core.scss

@@ -12,6 +12,6 @@ frigate-card-media-carousel {
   min-height: 0;
 }
 
-frigate-card-thumbnail-carousel-core {
+frigate-card-thumbnail-carousel {
   flex: 0 0 var(--frigate-card-carousel-thumbnail-size);
 }