WIP FlIP animations

index.html

<div class="frame">
    <div class="actions">
      <button class="btn btn--positive btn-open">Open modal</button>
      <button class="btn btn--positive btn-toggle-collapsed">Toggle expanded</button>
    </div>
    <div class="modal is-closed is-collapsed" hidden aria-hidden="true">
      <div class="modal__content">
        <div class="modal__title">
          <h1 class="modal__heading">Modal title</h1>
          <button class="btn btn--transparent btn-close">&times;</button>
        </div>

        <div class="modal__body">
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat quidem tempore, id. Quia dolore ipsam eveniet, iusto laborum explicabo aut, voluptatum, fugiat sapiente reiciendis recusandae molestias delectus sed vero aspernatur!</p>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat quidem tempore, id. Quia dolore ipsam eveniet, iusto laborum explicabo aut, voluptatum, fugiat sapiente reiciendis recusandae molestias delectus sed vero aspernatur!</p>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat quidem tempore, id. Quia dolore ipsam eveniet, iusto laborum explicabo aut, voluptatum, fugiat sapiente reiciendis recusandae molestias delectus sed vero aspernatur!</p>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat quidem tempore, id. Quia dolore ipsam eveniet, iusto laborum explicabo aut, voluptatum, fugiat sapiente reiciendis recusandae molestias delectus sed vero aspernatur!</p>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat quidem tempore, id. Quia dolore ipsam eveniet, iusto laborum explicabo aut, voluptatum, fugiat sapiente reiciendis recusandae molestias delectus sed vero aspernatur!</p>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat quidem tempore, id. Quia dolore ipsam eveniet, iusto laborum explicabo aut, voluptatum, fugiat sapiente reiciendis recusandae molestias delectus sed vero aspernatur!</p>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat quidem tempore, id. Quia dolore ipsam eveniet, iusto laborum explicabo aut, voluptatum, fugiat sapiente reiciendis recusandae molestias delectus sed vero aspernatur!</p>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat quidem tempore, id. Quia dolore ipsam eveniet, iusto laborum explicabo aut, voluptatum, fugiat sapiente reiciendis recusandae molestias delectus sed vero aspernatur!</p>
        </div>

        <div class="modal__footer">
          <button class="btn btn--positive">Accept</button>
          <button class="btn btn--negative">Cancel</button>
        </div>
      </div>

      <div class="modal__backdrop"></div>
    </div>
  </div>

script.js

(function(d) {
  var btnOpen = d.querySelector('.btn-open');
  var btnExpand = d.querySelector('.btn-toggle-collapsed');
  var btnClose = d.querySelector('.btn-close');
  var modal = d.querySelector('.modal');
  var modalContent = d.querySelector('.modal__content');
  var modalBackdrop = d.querySelector('.modal__backdrop');
  var flipped = false;

  btnOpen.addEventListener('click', openModal);
  btnExpand.addEventListener('click', expandModal);
  btnClose.addEventListener('click', closeModal);

  function flip() {
    var first = modalContent.getBoundingClientRect();

    // get last position
    modal.classList.remove('is-collapsed');
    modal.classList.add('is-expanded');

    var last = modalContent.getBoundingClientRect();
    modal.classList.remove('is-expanded');
    modal.classList.add('is-collapsed');

    var invert = {};
    invert.y = first.top - last.top;
    invert.sy = first.height - last.height;

    modalContent.style.transformOrigin = '0 100%';
    modalContent.style.transform = 'translateY(-' + invert.y + 'px)';

    flipped = true;
  }

  function openModal() {
    modal.hidden = false;
    modal.removeAttribute('aria-hidden');

    requestAnimationFrame(function() {
      setTimeout(function() {
        modal.classList.remove('is-closed');
        // !flipped && flip();
      }, 1);
    });
  }

  function expandModal() {
    modal.classList.toggle('is-collapsed');
    modal.classList.toggle('is-expanded');
  }

  function closeModal() {
    modal.classList.add('is-closed', 'is-collapsed');
    modal.classList.remove('is-expanded');

    requestAnimationFrame(function() {
      setTimeout(function() {
        modal.hidden = true;
        modal.setAttribute('aria-hidden', 'true');
      }, 380);
    });
  }
}(document));

style.scss

html,
body { height: 100%; }

body {
  font-family: Roboto, sans-serif;
  font-weight: 300;
  margin: 0;
  background: #f0f0f0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

[hidden] { display: none !important; }

.frame {
  width: 360px;
  height: 640px;
  margin: auto;
  border: 1px solid #ccc;
  background: #E4E4E4;
  box-sizing: border-box;
  position: relative;
  overflow: hidden;
}


.modal {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;

  &__content {
    transition: transform 360ms cubic-bezier(0,0,0.3,1);
    will-change: transform;
    transform-origin: bottom;
    align-self: flex-end;
    display: flex;
    height: 100%;
    flex-direction: column;
    background: #fff;
    overflow: hidden;
  }

  &__title {
    padding: 20px;
    box-shadow: 0 1px 7px rgba(black, .1), inset 0 -1px 0 rgba(black, .1);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

    &__heading {
      margin: 0;
      font-size: 20px;
      font-weight: 500;
    }

  &__body {
    flex: 1;
    overflow-y: auto;
    padding: 0 20px;
  }

  &__footer {
    padding: 20px;
    display: flex;
    justify-content: flex-end;
    box-shadow: 0 -1px 7px rgba(black, .1), inset 0 1px 0 rgba(black, .1);
  }

  // states
  &.is {
    &-collapsed {
      .modal__body {
        max-height: calc(50% - 146px);
      }
      .modal__content {
        transform: translateY(50%);
      }
    }
    &-expanded {
      z-index: 2;
      .modal__body {
        max-height: unset;
      }
      .modal__content {
        transform: none;
      }
    }
    &-closed {
      .modal__content {
        transform: translateY(100%);
      }
    }
  }
}

.btn {
  background: none;
  border: 0;
  padding: 10px;
  overflow: visible;
  min-height: 0;
  font-family: inherit;
  font-size: 14px;
  font-weight: 300;
  text-transform: uppercase;
  margin-left: 10px;
  border-radius: 3px;
  box-shadow: inset 0 -3px 0 rgba(0,0,0,.1);
  color: #fff;
  outline: none;
  cursor: pointer;
  min-width: 100px;
  white-space: nowrap;

  &::-moz-focus-inner {
    padding: 0;
    border: 0;
  }

  &:active {
    box-shadow: inset 0 3px 0 rgba(0,0,0,.1)
  }

  &--positive {
    background: #38C0C3;
  }

  &--negative {
    background: #F56A74;
  }

  &--transparent {
    color: #000;

    &:active { box-shadow: none; }
  }

  &-close {
    font-size: 28px;
    font-weight: 300;
    min-width: unset;
    box-shadow: none;
    line-height: 0;
    width: 30px;
    height: 30px;
    padding: 0;
    margin-right: -5px;
    opacity: .5;

    &:active {
      opacity: 1;
    }
  }
}

.actions {
  position: absolute;
  z-index: 1;
  transform: translate(-50%, 50%);
  left: 50%;
  top: 20px;
  margin: 0;
  display: flex;
}

WIP FlIP animations.markdown

WIP FlIP animations

A Pen by kcmr on CodePen.

License.