semaphore/routes/_components/Media.html

<div class="status-media {{sensitive ? 'status-media-is-sensitive' : ''}}"
     style="grid-template-columns: repeat(auto-fit, minmax({{minMediaWidth}}px, 1fr));" >
  {{#each mediaAttachments as media}}
  <div class="status-media-container {{hasNoNativeWidthHeight(media) ? 'no-native-width-height' : ''}}">
    {{#if media.type === 'video'}}
    <button type="button"
            class="play-video-button"
            aria-label="Play video: {{media.description || ''}}"
            on:click="onClickPlayVideoButton(media, getSmallWidth(media), getSmallHeight(media), media.description)">
      <div class="svg-wrapper">
        <svg>
          <use xlink:href="#fa-play-circle" />
        </svg>
      </div>
      <img alt="{{media.description || ''}}"
           src="{{media.preview_url}}"
           width="{{getSmallWidth(media)}}"
           height="{{getSmallHeight(media)}}" />
    </button>
    {{elseif media.type === 'gifv'}}
    <video
           aria-label="Animated GIF: {{media.description || ''}}"
           poster="{{media.preview_url}}"
           src="{{media.url}}"
           width="{{getSmallWidth(media)}}"
           height="{{getSmallHeight(media)}}"
           autoplay
           muted
           loop
           playsinline
    />
    {{else}}
      <img class="{{!imageLoaded ? 'image-loading' : ''}} {{imageError ? 'image-error' : ''}}"
           on:imgLoad="set({imageLoaded: true})"
           on:imgLoadError="set({imageError: true})"
           alt="{{media.description || ''}}"
           src="{{media.preview_url}}"
           width="{{getSmallWidth(media)}}"
           height="{{getSmallHeight(media)}}"/>
    {{/if}}
  </div>
  {{/each}}
</div>
<style>
  .status-media {
    grid-area: status-media;
    display: grid;
    align-items: center;
    justify-content: center;
    justify-items: center;
    grid-column-gap: 10px;
    grid-row-gap: 10px;
    margin: 10px 0;
  }

  .status-media.status-media-is-sensitive {
    margin: 0;
  }

  .status-media-container {
    overflow: hidden;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .no-native-width-height img, .no-native-width-height video {
    background-color: var(--mask-bg);
  }
  .status-media img.image-loading, .status-media img.image-error {
    background: var(--loading-bg);
  }
  .status-media {
    max-width: calc(100vw - 40px);
    overflow: hidden;
  }

  .status-media video, .status-media img {
    max-width: calc(100vw - 40px);
    object-fit: cover;
  }
  .play-video-button {
    margin: 0;
    padding: 0;
    position: relative;
    border-radius: 0;
    border: none;
    background: none;
  }
  .play-video-button .svg-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 40;
    pointer-events: none;
  }
  .play-video-button svg {
    width: 72px;
    height: 72px;
    fill: var(--mask-svg-fill);
    border-radius: 100%;
    background: var(--mask-opaque-bg);
  }
</style>
<script>
  const DEFAULT_MEDIA_WIDTH = 300
  const DEFAULT_MEDIA_HEIGHT = 200

  import { imgLoad, imgLoadError } from '../_utils/events'
  import { showVideoDialog } from '../_utils/showVideoDialog'

  export default {
    helpers: {
      getSmallWidth: media => media.meta && media.meta.small && typeof media.meta.small.width === 'number' ?  media.meta.small.width : DEFAULT_MEDIA_WIDTH,
      getSmallHeight: media => media.meta && media.meta.small && typeof media.meta.small.height === 'number' ?  media.meta.small.height : DEFAULT_MEDIA_HEIGHT,
      hasNoNativeWidthHeight: media => !(media && media.meta && media.meta.small && typeof media.meta.small.width === 'number' && typeof media.meta.small.height === 'number'),
    },
    computed: {
      minMediaWidth: (mediaAttachments) => Math.min.apply(Math, mediaAttachments.map(media => media.meta && media.meta.small && typeof media.meta.small.width === 'number' ?  media.meta.small.width : DEFAULT_MEDIA_WIDTH))
    },
    methods: {
      async onClickPlayVideoButton(media, width, height, description) {
        showVideoDialog(media.preview_url, media.url, width, height, description)
      }
    },
    events: {
      imgLoad,
      imgLoadError
    }
  }
</script>