tweb-i2p/src/scss/partials/_transition.scss

/*
 * https://github.com/morethanwords/tweb
 * Copyright (C) 2019-2021 Eduard Kuzmenko
 * https://github.com/morethanwords/tweb/blob/master/LICENSE
 */

.transition {
  --easeOutSine: cubic-bezier(.39, .575, .565, 1);
  --easeInSine: cubic-bezier(.47, 0, .745, .715);

  .transition-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    animation-fill-mode: forwards!important;

    &:not(.active):not(.from):not(.to) {
      display: none !important; // Best performance when animating container
    }
  }

  /*
   * zoom-fade
   */
   &.zoom-fade {
    > .from {
      transform-origin: center;
      transform: scale(1);
      opacity: 1;
    }

    > .to {
      transform-origin: center;
      opacity: 0;
    }

    &.animating {
      > .from {
        animation: fade-out-opacity .15s ease;
      }

      > .to {
        animation: fade-in-opacity .15s ease, zoom-fade-in-move .15s ease;
      }
    }
  }

  &.zoom-fade.backwards {
    > .from {
      transform: scale(1);
    }

    > .to {
      transform: scale(0.95);
    }

    &.animating {
      > .from {
        animation: fade-in-backwards-opacity .1s ease, zoom-fade-in-backwards-move .15s ease;
      }

      > .to {
        animation: fade-out-backwards-opacity .15s ease, zoom-fade-out-backwards-move .15s ease;
      }
    }
  }

  /*
   * slide-fade
   */
  &.slide-fade {
    position: relative;

    > .from {
      transform-origin: left center;
      transform: translateX(0);
      opacity: 1;
    }

    > .to {
      transform-origin: left center;
      transform: translateX(1.5rem);
      opacity: 0;
    }

    &.animating {
      > .from {
        animation: fade-out-opacity .4s ease-out, slide-fade-out-move .4s;
      }

      > .to {
        animation: fade-in-opacity .4s var(--easeInSine), slide-fade-in-move .4s;
      }
    }
  }

  &.slide-fade.backwards {
    > .from {
      transform: translateX(0);
      opacity: 1;
    }

    > .to {
      transform: translateX(-1.5rem);
      opacity: 0;
    }

    &.animating {
      > .from {
        animation: fade-in-backwards-opacity .4s ease-out, slide-fade-in-backwards-move .4s;
      }

      > .to {
        animation: fade-out-backwards-opacity .4s var(--easeOutSine), slide-fade-out-backwards-move .4s;
      }
    }
  }
}

/*
 * zoom-fade
 */
 @keyframes zoom-fade-in-move {
  0% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes zoom-fade-in-backwards-move {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.1);
  }
}

@keyframes zoom-fade-out-backwards-move {
  0% {
    transform: scale(0.95);
  }
  100% {
    transform: scale(1);
  }
}

/*
 * slide-fade
 */
@keyframes slide-fade-in-move {
  0% {
    transform: translateX(1.5rem);
  }
  100% {
    transform: translateX(0);
  }
}

@keyframes slide-fade-out-move {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-1.5rem);
  }
}

@keyframes slide-fade-in-backwards-move {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(1.5rem);
  }
}

@keyframes slide-fade-out-backwards-move {
  0% {
    transform: translateX(-1.5rem);
  }
  100% {
    transform: translateX(0);
  }
}

/* .zoom-fade {
  transition: .15s ease-in-out opacity, .15s ease-in-out transform;
  transform: scale3d(1.1, 1.1, 1);
  opacity: 0;
  display: flex;

  &.active {
    transform: scale3d(1, 1, 1);
    transform-origin: center;
    opacity: 1;
  }
} */