formstone/src/less/lightbox.less

Library of modular front end components.

@fs-lightbox-mobile-max-width: 739px;

@fs-lightbox-duration: 0.25s;
@fs-lightbox-timing: linear;

@fs-lightbox-overlay-bg: fade(#000, 90);

@fs-lightbox-loading-color: #fff;
@fs-lightbox-loading-size: 40px;
@fs-lightbox-loading-spread: 5px;
@fs-lightbox-loading-duration: 0.75s;

@fs-lightbox-item-duration: 0.25s;
@fs-lightbox-item-timing: ease;

@fs-lightbox-details-bg: fade(#000, 60);
@fs-lightbox-details-color: #fff;
@fs-lightbox-details-font: 16px / 1.4 sans-serif;
@fs-lightbox-details-padding: calc(env(safe-area-inset-top, 0px) + 40px) calc(env(safe-area-inset-top, 0px) + 60px) calc(env(safe-area-inset-bottom, 0px) + 40px);
@fs-lightbox-details-gap: 10px;

@fs-lightbox-button-background: fade(#000, 80);
@fs-lightbox-button-color: #fff;

.fs-lightbox {
  --fs-lightbox-duration: @fs-lightbox-duration;
  --fs-lightbox-timing: @fs-lightbox-timing;

  --fs-lightbox-overlay-bg: @fs-lightbox-overlay-bg;

  --fs-lightbox-loading-color: @fs-lightbox-loading-color;
  --fs-lightbox-loading-size: @fs-lightbox-loading-size;
  --fs-lightbox-loading-spread: @fs-lightbox-loading-spread;
  --fs-lightbox-loading-duration: @fs-lightbox-loading-duration;

  --fs-lightbox-item-duration: @fs-lightbox-item-duration;
  --fs-lightbox-item-timing: @fs-lightbox-item-timing;

  --fs-lightbox-details-bg: @fs-lightbox-details-bg;
  --fs-lightbox-details-color: @fs-lightbox-details-color;
  --fs-lightbox-details-font: @fs-lightbox-details-font;
  --fs-lightbox-details-padding: @fs-lightbox-details-padding;
  --fs-lightbox-details-gap: @fs-lightbox-details-gap;

  --fs-lightbox-button-background: @fs-lightbox-button-background;
  --fs-lightbox-button-color: @fs-lightbox-button-color;

  @media (prefers-reduced-motion) {

    & {
      --fs-lightbox-duration: 0s;
      --fs-lightbox-loading-duration: 0s;
      --fs-lightbox-item-duration: 0s;
    }
  }

  //

  height: 100vh;
  width: 100vw;

  z-index: 999;

  opacity: 0;
  transition: opacity var(--fs-lightbox-duration) var(--fs-lightbox-timing);

  &,
  & * {
    box-sizing: border-box;
  }

  //

  &-open {
    opacity: 1;
  }

  //

  &,
  &-overlay {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }

  &-overlay {
    z-index: 0;

    background: var(--fs-lightbox-overlay-bg);
  }

  //

  &-sr {
    width: 1px !important;
    height: 1px !important;

    position: absolute !important;

    border-width: 0 !important;
    clip: rect(0, 0, 0, 0) !important;
    margin: -1px !important;
    overflow: hidden !important;
    padding: 0 !important;
    white-space: nowrap !important;
  }

  //

  &-container {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1;

    user-select: none;
  }

  &-container&-touching {
    cursor: grabbing;
  }

  //

  &-item {
    position: absolute;
    top: env(safe-area-inset-top, 0px);
    right: env(safe-area-inset-right, 0px);
    bottom: env(safe-area-inset-bottom, 0px);
    left: env(safe-area-inset-left, 0px);

    display: flex;
    flex-direction: column;
    justify-content: center;

    opacity: 0;
    transition:
      opacity var(--fs-lightbox-item-duration) var(--fs-lightbox-item-timing),
      transform var(--fs-lightbox-item-duration) var(--fs-lightbox-item-timing);
    transform: none;

    &_previous {
      transform: translate(-100%, 0);
    }

    &_next {
      transform: translate(100%, 0);
    }
  }

  &-item&-active&-loaded {
    opacity: 1;
  }

  //

  &-rtl &-item {

    &_previous {
      transform: translate(100%, 0);
    }

    &_next {
      transform: translate(-100%, 0);
    }
  }

  //

  // &-item&-zoomed img {
  //   max-height: none;
  //   max-width: none;
  // }

  &-container&-touching &-item {
    transition: none;
  }

  &-wrap {
    max-height: 100%;
    max-width: 100%;

    display: flex;
    justify-content: center;

    position: relative;
  }

  //

  &-media {
    height: auto;
    width: auto;
    max-height: 100%;
    max-width: 100%;

    display: flex;
    align-items: center;
    justify-content: center;
  }

  &-media_video {
    max-width: 1200px;

    flex-grow: 1;
  }

  &-media_image {

    img {
      height: auto;
      width: auto;

      min-width: 200px;

      max-height: 100%;
      max-width: 100%;

      border: none;
      display: block;
      margin: auto;

      user-select: none;
      touch-action: none;
    }
  }

  &-video {
    position: relative;

    width: 100%;

    iframe {
      aspect-ratio: 16 / 9;

      width: 100%;

      background: #000;
    }
  }

  &-iframe {

    iframe {
      height: calc(100vh - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px));
      width: calc(100vw - env(safe-area-inset-left, 0px) - env(safe-area-inset-right, 0px));

      background: #000;
    }
  }

  &-iframe &-close {
    // background: var(--fs-lightbox-button-background);
    // color: var(--fs-lightbox-button-color);
  }

  &-element {
    max-width: 100%;
    max-height: 100%;

    overflow: auto;
  }

  //

  &-details {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--fs-lightbox-details-gap);

    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 2;

    background: linear-gradient(to bottom, transparent, var(--fs-lightbox-details-bg));
    color: var(--fs-lightbox-details-color);
    font: var(--fs-lightbox-details-font);
    opacity: 0;
    padding: var(--fs-lightbox-details-padding);
    transition: opacity 0.001s var(--fs-lightbox-item-timing) 0s;

    pointer-events: none;

    * {
      pointer-events: all;
    }
  }

  &-item&-active &-details {
    opacity: 1;
    transition-delay: var(--fs-lightbox-item-duration);
    transition-duration: var(--fs-lightbox-item-duration);
  }

  &-container&-touching &-item&-active &-details {
    opacity: 0;
    transition-delay: 0.001s;
    transition-duration: 0s;
  }

  //

  &-close {
    display: flex;
    align-items: center;
    justify-content: center;

    height: 40px;
    width: 40px;

    position: absolute;
    top: env(safe-area-inset-top, 0px);
    right: env(safe-area-inset-right, 0px);
    z-index: 2;

    appearance: none;

    background: var(--fs-lightbox-button-background);
    border: none;
    color: var(--fs-lightbox-button-color);
    cursor: pointer;
    padding: 0;

    svg {
      width: 30px;
    }
  }

  //

  &:not(&-gallery) &-control {
    display: none;
  }

  &-control {
    display: flex;
    align-items: center;
    justify-content: center;

    height: 40px;
    width: 40px;

    position: absolute;
    top: env(safe-area-inset-top, 0px);
    bottom: env(safe-area-inset-bottom, 0px);
    z-index: 2;

    appearance: none;

    background: var(--fs-lightbox-button-background);
    border: none;
    color: var(--fs-lightbox-button-color);
    margin: auto;
    padding: 0;
    opacity: 0.5;
    transition: opacity var(--fs-lightbox-duration) var(--fs-lightbox-timing);

    @media screen and (max-width: @fs-lightbox-mobile-max-width) {
      top: auto;
    }

    &_previous {
      left: 0;
    }

    &_next {
      right: 0;
    }

    svg {
      width: 28px;
    }
  }

  //

  &-rtl &-control {

    svg {
      transform: scale(-1);
    }

    &_previous {
      left: unset;
      right: 0;
    }

    &_next {
      right: unset;
      left: 0;
    }
  }

  //

  &-control:not([disabled]) {
    cursor: pointer;
    opacity: 1;
  }

  //

  // &-zoom {
  //   display: flex;
  //   align-items: center;
  //   justify-content: center;

  //   height: 40px;
  //   width: 40px;

  //   position: absolute;
  //   bottom: env(safe-area-inset-bottom, 0px);
  //   right: env(safe-area-inset-right, 0px);
  //   z-index: 2;

  //   appearance: none;

  //   background: var(--fs-lightbox-button-background);
  //   border: none;
  //   color: var(--fs-lightbox-button-color);
  //   display: none;
  //   margin: auto;
  //   padding: 0;
  //   // opacity: 0.5;
  //   // transition: opacity var(--fs-lightbox-duration) var(--fs-lightbox-timing);

  //   &_in {
  //     right: calc(env(safe-area-inset-right, 0px) + 40px);

  //     display: block;
  //   }

  //   &_out {
  //     display: block;
  //   }

  //   svg {
  //     width: 28px;
  //   }
  // }

  //

  &-loading {
    display: flex;
    justify-content: center;
    align-items: center;

    height: var(--fs-lightbox-loading-size);
    width: var(--fs-lightbox-loading-size);

    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;

    animation: fs-lightbox-loading-spin var(--fs-lightbox-loading-duration) linear infinite;
    border: var(--fs-lightbox-loading-spread) solid transparent;
    border-top-color: var(--fs-lightbox-loading-color);
    border-radius: 100%;
    margin: auto;
    opacity: 0;
    transition: opacity var(--fs-lightbox-duration) var(--fs-lightbox-timing);
  }

  &-loading&-visible {
    opacity: 1;
  }
}

@keyframes fs-lightbox-loading-spin {

  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}