Animation

by maxell4o

HTML

<div class="box">
  <div class="pin"></div>
  <div class="menu">
    <div class="link">link 1</div>
    <div class="link">link text 2</div>
    <div class="link">link 3</div>
</div>
</div>

SCSS

.box{
  position: fixed;
  top: 100px;
  right: 0;
  cursor: grab;
  
  &:not(.open) .pin {
    transform: translate(-100%, -50%);
  }
  
  &.open .menu {
    transform: translate(-100%, -50%);
  }
}

.pin {
  width: 50px;
  height: 50px;
  margin-left: 3px;
  background-color: red;
  position: absolute;
  transition: transform 500ms;
  transition-timing-function: cubic-bezier(0,.5,.1,1.2);
  transform: translate(0, -50%);
  z-index: 2;
}

.menu {
  margin-left: 5px;
  position: absolute;
  transition: transform 500ms;
  transform: translate(0, -50%);
  transition-timing-function: cubic-bezier(0,.5,.1,1.2);
  z-index: 1;
  
  .link {
    color: #fff;
    line-height: 40px;
    border-radius: 20px;
    background: black;
    margin: 5px 10px; 
    padding: 0 10px;
    min-width: 100px;
    white-space: nowrap;
  }
}

JavaScript

let box = document.querySelector('.box');
let menu = box.querySelector('.menu');
let active = false;
let currentY;
let initialY;
let yOffset = window.innerHeight / 2;
const getClientY = e => (e.type === 'touchmove' || e.type === 'touchmove') ? e.touches[0].clientY : e.clientY;
const setPosition = (y, el) => el.style.top = y+'px';

box.addEventListener('click', e => {
	e.currentTarget.classList.toggle('open');
});
document.addEventListener("touchstart", dragStart, false);
document.addEventListener("touchend", dragEnd, false);
document.addEventListener("touchmove", drag, false);
document.addEventListener("mousedown", dragStart, false);
document.addEventListener("mouseup", dragEnd, false);
document.addEventListener("mousemove", drag, false);

setPosition(yOffset, box);

function dragStart(e) {
  initialY = getClientY(e) - yOffset;
  active = e.target.closest('.box') === box;
}

function dragEnd(e) {
  initialY = currentY;
  active = false;
}

function drag(e) {
  if (active) {      
    e.preventDefault();
    let minY = menu.clientHeight / 2;
    let maxY = window.innerHeight - (menu.clientHeight / 2);
    currentY = getClientY(e) - initialY;
    yOffset = currentY <= minY ? minY : currentY >= maxY ? maxY : currentY;
    setPosition(yOffset, box);
  }
}