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html

css

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html

css

body{background-color: #2D2D2D}
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Roboto", sans-serif;
}

.material-icons {
  font-size: 1.5rem;
  color: rgba(0, 0, 0, 0.54);
  vertical-align: middle;
  line-height: 100%;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}

.app-canvas {
  display: flex;
  justify-content: center;
  padding-top: 100px;
}

.menubox {
  position: relative;
  display: inline-block;
  background: white;
  border: 1px solid #dbdbdb;
  border-radius: 6px;
  -webkit-transform-origin: top center;
          transform-origin: top center;
  overflow: hidden;
  transition: border-radius .25s ease-in-out;
}
.menubox:focus, .menubox:focus-within {
  outline: none;
  border-color: #c2c2c2;
}
.menubox:focus::after, .menubox:focus-within::after {
  content: '';
  height: 100%;
  width: 100%;
  position: absolute;
  border-radius: inherit;
  border: inherit;
  border-width: 2px;
  left: -2px;
  top: -2px;
}
.menubox.menubox--collapsed {
  border-radius: 50px;
}
.menubox__label {
  position: relative;
  color: #595959;
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.05rem;
  padding: 0.625rem 5rem 0.625rem 1rem;
  background: #f9f9f9;
  -webkit-transform-origin: top center;
          transform-origin: top center;
  cursor: pointer;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}
.menubox__label-text {
  line-height: 100%;
  vertical-align: middle;
  position: relative;
  left: 0.25rem;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}
.menubox__label::after {
  content: '';
  width: 1px;
  height: 1px;
  right: 1rem;
  top: 0;
  bottom: 0;
  margin: auto;
  position: absolute;
  display: inline-block;
  border-top: 5px solid #595959;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
  transition: -webkit-transform .25s ease-in-out;
  transition: transform .25s ease-in-out;
  transition: transform .25s ease-in-out, -webkit-transform .25s ease-in-out;
}
.menubox--collapsed .menubox__label::after {
  -webkit-transform: rotateZ(-90deg);
          transform: rotateZ(-90deg);
}
.menubox__contents {
  padding: 0.5rem 0;
  -webkit-transform-origin: top center;
          transform-origin: top center;
  border-top: 1px solid #dbdbdb;
}
.menubox__options {
  list-style-type: none;
}
.menubox__option {
  position: relative;
}
.menubox__option-label {
  position: relative;
  color: gray;
  transition: all .35s ease-out;
  z-index: 1;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}
.menubox__option-toggle {
  display: block;
  font-weight: 400;
  font-size: 0.875rem;
  padding: 0.5rem 4rem 0.5rem 1rem;
  cursor: pointer;
  -webkit-animation: entrance .4s ease-out;
          animation: entrance .4s ease-out;
}
.menubox__option-toggle::before {
  content: '';
  position: absolute;
  width: calc(100% - 0.25rem);
  height: calc(100% - 2px);
  left: 0;
  top: 0;
  border-radius: 0 50px 50px 0;
  opacity: 0;
  background: #f9f9f9;
  -webkit-transform: scaleX(0);
          transform: scaleX(0);
  -webkit-transform-origin: left center;
          transform-origin: left center;
  transition: opacity .25s ease-out, -webkit-transform .25s ease-out;
  transition: opacity .25s ease-out, transform .25s ease-out;
  transition: opacity .25s ease-out, transform .25s ease-out, -webkit-transform .25s ease-out;
}
@-webkit-keyframes entrance {
  from {
    opacity: 0;
    -webkit-transform: translateY(-15px);
            transform: translateY(-15px);
  }
  to {
    opacity: 1;
    -webkit-transform: translateY(0px);
            transform: translateY(0px);
  }
}
@keyframes entrance {
  from {
    opacity: 0;
    -webkit-transform: translateY(-15px);
            transform: translateY(-15px);
  }
  to {
    opacity: 1;
    -webkit-transform: translateY(0px);
            transform: translateY(0px);
  }
}
.menubox__option-toggle:hover::before, .menubox__option-toggle:focus-within::before {
  opacity: 1;
  -webkit-transform: scaleX(1);
          transform: scaleX(1);
}
.menubox__option-toggle:hover .menubox__option-label, .menubox__option-toggle:focus-within .menubox__option-label {
  color: #4d4d4d;
}
.menubox__option-toggle:hover::before {
  border: 1px solid #e8e8e8;
  border-left: 0;
}
.menubox__option-toggle:focus-within::before {
  background: whitesmoke;
}
.menubox__option-toggle input[type=checkbox] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  clip: rect(1px 1px 1px 1px);
  -webkit-clip-path: inset(50%);
          clip-path: inset(50%);
  overflow: hidden;
}
.menubox__option-toggle input[type=checkbox] ~ .menubox__option-toggle-check {
  position: absolute;
  top: 0;
  right: 0.375rem;
  width: 2rem;
  height: 100%;
}
.menubox__option-toggle input[type=checkbox]:checked ~ .menubox__option-label {
  color: #606060;
  font-weight: 500;
}
.menubox__option-toggle input[type=checkbox]:checked ~ .menubox__option-toggle-check {
  -webkit-animation: tick 1s ease-out 25ms backwards;
          animation: tick 1s ease-out 25ms backwards;
}
@-webkit-keyframes tick {
  0% {
    -webkit-clip-path: inset(0 60% 50% 0);
            clip-path: inset(0 60% 50% 0);
  }
  60%, 100% {
    -webkit-clip-path: inset(0);
            clip-path: inset(0);
  }
}
@keyframes tick {
  0% {
    -webkit-clip-path: inset(0 60% 50% 0);
            clip-path: inset(0 60% 50% 0);
  }
  60%, 100% {
    -webkit-clip-path: inset(0);
            clip-path: inset(0);
  }
}
.menubox__option-toggle input[type=checkbox]:checked ~ .menubox__option-toggle-check, .menubox__option-toggle input[type=checkbox] ~ .menubox__option-toggle-check.unchecking {
  background: transparent url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiIgdmlld0JveD0iMCAwIDI0IDI0IiBmaWxsPSJub25lIiBzdHJva2U9IiM2MWJmOWUiIHN0cm9rZS13aWR0aD0iMyIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIj48cG9seWxpbmUgcG9pbnRzPSIyMCA2IDkgMTcgNCAxMiI+PC9wb2x5bGluZT48L3N2Zz4=) center/45% no-repeat;
}
.menubox__option-toggle input[type=checkbox] ~ .menubox__option-toggle-check.unchecking {
  -webkit-animation: untick .35s ease-out backwards;
          animation: untick .35s ease-out backwards;
}
@-webkit-keyframes untick {
  0% {
    -webkit-clip-path: inset(0);
            clip-path: inset(0);
  }
  60% {
    -webkit-clip-path: inset(0 60% 0 0);
            clip-path: inset(0 60% 0 0);
  }
  80%, 100% {
    -webkit-clip-path: inset(0 100% 100% 0);
            clip-path: inset(0 100% 100% 0);
  }
}
@keyframes untick {
  0% {
    -webkit-clip-path: inset(0);
            clip-path: inset(0);
  }
  60% {
    -webkit-clip-path: inset(0 60% 0 0);
            clip-path: inset(0 60% 0 0);
  }
  80%, 100% {
    -webkit-clip-path: inset(0 100% 100% 0);
            clip-path: inset(0 100% 100% 0);
  }
}

JavaScript

const menubox = document.querySelector('.menubox');
const menulabel = menubox.querySelector('.menubox__label');
const menucontent = menubox.querySelector('.menubox__contents');
const menuchecks = menubox.querySelectorAll('input[type=checkbox]');

const menuboxRect = menubox.getBoundingClientRect();
const menulabelRect = menulabel.getBoundingClientRect();

const frameTime = 1000 / 60;
const duration = 350;
const frames = Math.ceil(duration / frameTime);

const slideHeight = menuboxRect.height - menulabelRect.height;

// const menuScaleFactor = menulabelRect.height / menuboxRect.height;

// menubox.style.transform = `scale(1, ${menuScaleFactor})`;
// menucontent.style.transform = `scale(1, 0)`;
// menulabel.style.transform = `scale(1, ${1 / menuScaleFactor})`

let timer = null;
let currentItem = 0;

const debouncedFn = (fn) => {
  timer && clearTimeout(timer);
  timer = setTimeout(fn, 250);
}

function animateHeight (collapsing, done) {
  let i = 0;
  
  function __animate () {
    // const scale = (collapsing ? frames - (i++) : i++) / frames;
    // const height = menulabelRect.height + (scale * slideHeight);
    
    const factor = Math.pow((i++) / frames - 1, 3) + 1;
    const height = menulabelRect.height + (collapsing ? 1 - factor : factor) * slideHeight;

menubox.style.maxHeight = `${height}px`;

if (i <= frames) {
      requestAnimationFrame(__animate);
    } else {
      if (collapsing) {
        const transitionEnded = () => {
          menubox.removeEventListener('transitionend', transitionEnded);
          document.removeEventListener('click', documentAnimateHeight);
          
          (typeof done === 'function') && done();
        }
        
        menubox.classList.add('menubox--collapsed');
        menubox.addEventListener('transitionend', transitionEnded, false);
      } else {
        menuchecks.item(currentItem = 0).focus();
        (typeof done === 'function') && done();
      }
      
      timer && clearTimeout(timer);
      timer = null;
    }
  }
  
  if (collapsing) {
    requestAnimationFrame(__animate);
  } else {
    const transitionEnded = () => {
      menubox.removeEventListener('transitionend', transitionEnded);
      requestAnimationFrame(__animate);
    }
    
    menubox.classList.remove('menubox--collapsed');
    menubox.addEventListener('transitionend', transitionEnded, false);
      
    document.addEventListener('click', documentAnimateHeight);
  }
}

menubox.addEventListener('focus', () => {
  debouncedFn(() => {
    menubox.classList.contains('menubox--collapsed') && animateHeight(false, () => {
      menubox.blur();
      menubox.setAttribute('tabIndex', -1);
    });
  });
});

menubox.addEventListener('keydown', (e) => {
  switch (e.key) {
    case 'Down':
    case 'ArrowDown': {
      menuchecks.item(++currentItem === menuchecks.length ? (currentItem = 0) : currentItem).focus();
      break;
    }
      
    case 'Up':
    case 'ArrowUp': {
      menuchecks.item(--currentItem < 0 ? (currentItem = menuchecks.length - 1) : currentItem).focus();
      break;
    }
      
    case 'Enter': {
      menuchecks.item(currentItem).click();
      break;
    }
      
    case 'Tab':
    case 'Escape': {
      debouncedFn(() => {
        !menubox.classList.contains('menubox--collapsed') && animateHeight(true, () => {
          // menubox.blur();
          menubox.setAttribute('tabIndex', 0);
        });
      });
      
      break;
    }
  }
});

menulabel.addEventListener('click', () => {
  debouncedFn(() => {
    animateHeight(!menubox.classList.contains('menubox--collapsed'));
  });
});

menuchecks.forEach((checkbox, index) => {
  checkbox.setAttribute('tabindex', -1);
  
  checkbox.addEventListener('change', function() {
    currentItem = index;
    
    if (!this.checked) {
      const checker = this.closest('label')
        .querySelector('.menubox__option-toggle-check');
      
      const animationEnded = () => {
        checker.classList.remove('unchecking');
        checker.removeEventListener('animationend', animationEnded);
      };
      
      checker.classList.add('unchecking');
      checker.addEventListener('animationend', animationEnded, false);
    }
  }, false);
});

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