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flip technique
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Document</title> | |
| <style> | |
| .list { | |
| width: 200px; | |
| margin: 0 auto; | |
| display: flex; | |
| flex-direction: column; | |
| position: relative; | |
| } | |
| .grid { | |
| width: 180px; | |
| margin: 0 auto; | |
| display: grid; | |
| grid-template-columns: auto auto auto; | |
| grid-template-rows: auto; | |
| } | |
| .item { | |
| position: relative; | |
| height: 20px; | |
| border: 1px solid #eee; | |
| margin: 5px; | |
| text-align: center; | |
| } | |
| .flip { | |
| transition: all 1s ease; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h2> | |
| List shuffle | |
| </h2> | |
| <div class="list"> | |
| <div class="item">11</div> | |
| <div class="item">22</div> | |
| <div class="item">33</div> | |
| <div class="item">44</div> | |
| <div class="item">55</div> | |
| </div> | |
| <h2> | |
| Grid shuffle | |
| </h2> | |
| <div class="grid"> | |
| <div class="item">01</div> | |
| <div class="item">02</div> | |
| <div class="item">03</div> | |
| <div class="item">04</div> | |
| <div class="item">05</div> | |
| <div class="item">06</div> | |
| <div class="item">07</div> | |
| <div class="item">08</div> | |
| <div class="item">09</div> | |
| <div class="item">10</div> | |
| <div class="item">11</div> | |
| <div class="item">12</div> | |
| </div> | |
| <script> | |
| let running = 0 | |
| const list = document.querySelectorAll('.list .item') | |
| const grid = document.querySelectorAll('.grid .item') | |
| document.querySelector('.list').addEventListener('click', function () { | |
| if (running) return | |
| flip(list) | |
| }) | |
| document.querySelector('.grid').addEventListener('click', function () { | |
| if (running) return | |
| flip(grid) | |
| }) | |
| function first (list) { | |
| return [].map.call(list, (el) => el.getBoundingClientRect()) | |
| } | |
| function last (list) { | |
| function shuffle (list) { | |
| const lst = list.slice(0) | |
| const len = lst.length | |
| for (let _ in lst) { | |
| const i = Math.floor(Math.random() * len) | |
| const j = Math.floor(Math.random() * len) | |
| if (i !== j) { | |
| [lst[i], lst[j]] = [lst[j], lst[i]] | |
| } | |
| } | |
| return lst | |
| } | |
| return shuffle(list) | |
| } | |
| function invert (els, first, last) { | |
| const diff = first.map((f, i) => { | |
| return { | |
| top: f.top - last[i].top, | |
| left: f.left - last[i].left | |
| } | |
| }) | |
| console.log('--- invert ---') | |
| els.forEach((el, i) => { | |
| const lastTop = parseInt(el.style.top) || 0 | |
| const lastLeft = parseInt(el.style.left) || 0 | |
| el.style.top = `${lastTop - diff[i].top}px` | |
| el.style.left = `${lastLeft - diff[i].left}px` | |
| console.log(first[i], last[i], diff[i]) | |
| el.style.transform = `translate(${diff[i].left}px, ${diff[i].top}px)` | |
| }) | |
| } | |
| function play (els) { | |
| requestAnimationFrame(() => { | |
| els.forEach((el) => { | |
| el.classList.add('flip') | |
| running++ | |
| }) | |
| requestAnimationFrame(() => { | |
| els.forEach((el) => { | |
| el.style.transform = '' | |
| el.addEventListener('transitionend', function onEnd() { | |
| el.removeEventListener('transitionend', onEnd) | |
| el.classList.remove('flip') | |
| running-- | |
| }) | |
| }) | |
| }) | |
| }) | |
| } | |
| function flip (els) { | |
| const f = first(els) | |
| const l = last(f) | |
| invert(els, f, l) | |
| play(els) | |
| } | |
| </script> | |
| </body> | |
| </html> |
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