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index.html
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index.html
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<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>拖拽</title>
</head>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.grid {
display: flex;
flex-wrap: wrap;
margin: 0 -15px -15px 0;
touch-action: none;
user-select: none;
}
.grid-item {
width: 90px;
height: 90px;
line-height: 88px;
text-align: center;
margin: 0 15px 15px 0;
background: #fff;
border: 1px solid #d6d6d6;
list-style: none;
}
.active {
background: #c8ebfb;
}
.clone-grid-item {
position: fixed;
left: 0;
top: 0;
z-index: 1;
width: 90px;
height: 90px;
line-height: 88px;
text-align: center;
background: #fff;
border: 1px solid #d6d6d6;
opacity: 0.8;
list-style: none;
}
</style>
<body>
<ul class="grid">
<li class="grid-item">item1</li>
<li class="grid-item">item2</li>
<li class="grid-item">item3</li>
<li class="grid-item">item4</li>
<li class="grid-item">item5</li>
<li class="grid-item">item6</li>
<li class="grid-item">item7</li>
<li class="grid-item">item8</li>
<li class="grid-item">item9</li>
<li class="grid-item">item10</li>
</ul>
</body>
<script>
class Draggable {
constructor(options) {
this.parent = options.element; // 父级元素
this.cloneElementClassName = options.cloneElementClassName; // 克隆元素类名
this.isPointerdown = false;
this.diff = { x: 0, y: 0 }; // 相对于上一次移动差值
this.drag = { element: null, index: 0, lastIndex: 0 }; // 拖拽元素
this.drop = { element: null, index: 0, lastIndex: 0 }; // 释放元素
this.clone = { element: null, x: 0, y: 0 };
this.lastPointermove = { x: 0, y: 0 };
this.rectList = []; // 用于保存拖拽项getBoundingClientRect()方法获得的数据
this.init();
}
init() {
this.getRect();
this.bindEventListener();
}
// 获取元素位置信息
getRect() {
this.rectList.length = 0;
for (const item of this.parent.children) {
this.rectList.push(item.getBoundingClientRect());
}
}
handlePointerdown(e) {
// 如果是鼠标点击，只响应左键
if (e.pointerType === 'mouse' && e.button !== 0) {
return;
}
if (e.target === this.parent) {
return;
}
this.isPointerdown = true;
this.parent.setPointerCapture(e.pointerId);
this.lastPointermove.x = e.clientX;
this.lastPointermove.y = e.clientY;
this.drag.element = e.target;
this.drag.element.classList.add('active');
this.clone.element = this.drag.element.cloneNode(true);
this.clone.element.className = this.cloneElementClassName;
this.clone.element.style.transition = 'none';
const i = [].indexOf.call(this.parent.children, this.drag.element);
this.clone.x = this.rectList[i].left;
this.clone.y = this.rectList[i].top;
this.drag.index = i;
this.drag.lastIndex = i;
this.clone.element.style.transform =
'translate3d(' + this.clone.x + 'px, ' + this.clone.y + 'px, 0)';
document.body.appendChild(this.clone.element);
}
handlePointermove(e) {
if (this.isPointerdown) {
this.diff.x = e.clientX - this.lastPointermove.x;
this.diff.y = e.clientY - this.lastPointermove.y;
this.lastPointermove.x = e.clientX;
this.lastPointermove.y = e.clientY;
this.clone.x += this.diff.x;
this.clone.y += this.diff.y;
this.clone.element.style.transform =
'translate3d(' + this.clone.x + 'px, ' + this.clone.y + 'px, 0)';
for (let i = 0; i < this.rectList.length; i++) {
// 碰撞检测
if (
e.clientX > this.rectList[i].left &&
e.clientX < this.rectList[i].right &&
e.clientY > this.rectList[i].top &&
e.clientY < this.rectList[i].bottom
) {
this.drop.element = this.parent.children[i];
this.drop.lastIndex = i;
if (this.drag.element !== this.drop.element) {
if (this.drag.index < i) {
this.parent.insertBefore(
this.drag.element,
this.drop.element.nextElementSibling
);
this.drop.index = i - 1;
} else {
this.parent.insertBefore(
this.drag.element,
this.drop.element
);
this.drop.index = i + 1;
}
this.drag.index = i;
const dragRect = this.rectList[this.drag.index];
const lastDragRect = this.rectList[this.drag.lastIndex];
const dropRect = this.rectList[this.drop.index];
const lastDropRect = this.rectList[this.drop.lastIndex];
this.drag.lastIndex = i;
this.drag.element.style.transition = 'none';
this.drop.element.style.transition = 'none';
this.drag.element.style.transform =
'translate3d(' +
(lastDragRect.left - dragRect.left) +
'px, ' +
(lastDragRect.top - dragRect.top) +
'px, 0)';
this.drop.element.style.transform =
'translate3d(' +
(lastDropRect.left - dropRect.left) +
'px, ' +
(lastDropRect.top - dropRect.top) +
'px, 0)';
this.drag.element.offsetLeft; // 触发重绘
this.drag.element.style.transition = 'transform 150ms';
this.drop.element.style.transition = 'transform 150ms';
this.drag.element.style.transform =
'translate3d(0px, 0px, 0px)';
this.drop.element.style.transform =
'translate3d(0px, 0px, 0px)';
}
break;
}
}
}
}
handlePointerup(e) {
if (this.isPointerdown) {
this.isPointerdown = false;
this.drag.element.classList.remove('active');
this.clone.element.remove();
}
}
handlePointercancel(e) {
if (this.isPointerdown) {
this.isPointerdown = false;
this.drag.element.classList.remove('active');
this.clone.element.remove();
}
}
bindEventListener() {
this.handlePointerdown = this.handlePointerdown.bind(this);
this.handlePointermove = this.handlePointermove.bind(this);
this.handlePointerup = this.handlePointerup.bind(this);
this.handlePointercancel = this.handlePointercancel.bind(this);
this.getRect = this.getRect.bind(this);
this.parent.addEventListener('pointerdown', this.handlePointerdown);
this.parent.addEventListener('pointermove', this.handlePointermove);
this.parent.addEventListener('pointerup', this.handlePointerup);
this.parent.addEventListener('pointercancel', this.handlePointercancel);
window.addEventListener('scroll', this.getRect);
window.addEventListener('resize', this.getRect);
window.addEventListener('orientationchange', this.getRect);
}
unbindEventListener() {
this.parent.removeEventListener('pointerdown', this.handlePointerdown);
this.parent.removeEventListener('pointermove', this.handlePointermove);
this.parent.removeEventListener('pointerup', this.handlePointerup);
this.parent.removeEventListener(
'pointercancel',
this.handlePointercancel
);
window.removeEventListener('scroll', this.getRect);
window.removeEventListener('resize', this.getRect);
window.removeEventListener('orientationchange', this.getRect);
}
}
// 实例化
new Draggable({
element: document.querySelector('.grid'),
cloneElementClassName: 'clone-grid-item',
});
</script>
</html>