直播系统开发，vue拖拽元素指令 - 云豹科技

直播系统开发，vue拖拽元素指令

记录简单实用的vue拖拽元素指令

 

drag.js(指令js)

// 绑定事件
function _addEvent(el, eventName, fn){if(document.addEventListener){el.addEventListener(eventName, fn, false);}else if(window.attachEvent){el.attactEvent('on' + eventName, fn);}
};
// 解绑事件
function _offEvent(el, eventName, fn){if(document.removeEventListener){el.removeEventListener(eventName, fn, false);}else if(window.detachEvent){el.detachEvent('on' + eventName, fn);}
};
export default {bind(el, binding, vnode) {if(!binding.value.dragElSelector){console.error('需传递拖拽元素的选择器，参数名：dragElSelector')return;}if(binding.value.useDrag === false){return;}const dialogHeaderEl = el.querySelector(binding.value.dragElSelector);const dragDom = el;// 是否使用边界，如果使用边界则元素不会被拖出窗口const useBoundary = binding.value.useBoundary !== false;const onDrag = binding.value.onDrag;dialogHeaderEl.style.cssText += ';cursor:move;';// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);const getStyle = (function() {if (window.document.currentStyle) {return (dom, attr) => dom.currentStyle[attr]} else {return (dom, attr) => getComputedStyle(dom, false)[attr]}})()let mouseDownEvent = (e) => {// console.log(e.clientX, e.clientY)// console.log(vnode); // 鼠标按下，计算当前元素距离可视区的距离const disX = e.clientX - dialogHeaderEl.offsetLeftconst disY = e.clientY - dialogHeaderEl.offsetTopconst dragDomWidth = dragDom.offsetWidthconst dragDomHeight = dragDom.offsetHeightconst screenWidth = document.body.clientWidth || window.innerWidthconst screenHeight = document.body.clientHeight || window.innerHeightconst minDragDomLeft = dragDom.offsetLeftconst maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidthconst minDragDomTop = dragDom.offsetTopconst maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomHeight// console.log('minDragDomTop', minDragDomTop, maxDragDomTop)// console.log('screenHeight', screenHeight) // 获取到的值带px 正则匹配替换let styL = getStyle(dragDom, 'left')let styT = getStyle(dragDom, 'top')if (styL.includes('%')) {styL = +document.body.clientWidth * (+styL.replace(/%/g, '') / 100)styT = +document.body.clientHeight * (+styT.replace(/%/g, '') / 100)} else {styL = +styL.replace(/px/g, '')styT = +styT.replace(/px/g, '')}let mouseMoveEvent = (e) => {e.preventDefault();// 通过事件委托，计算移动的距离let left = e.clientX - disXlet top = e.clientY - disYif(useBoundary){// 边界处理if (-(left) > minDragDomLeft) {left = -minDragDomLeft} else if (left > maxDragDomLeft) {left = maxDragDomLeft}// console.log('top maxDragDomTop', top, maxDragDomTop)if (-top > minDragDomTop) {top = -minDragDomTop}else if (top > maxDragDomTop) {top = maxDragDomTop}}// 移动当前元素dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`// 执行 onDrag 事件if(typeof onDrag === 'function'){onDrag();}};_addEvent(document, 'mousemove', mouseMoveEvent);let mouseUpEvent = function () {_offEvent(document, 'mousemove', mouseMoveEvent);_offEvent(document, 'mouseup', mouseUpEvent);}_addEvent(document, 'mouseup', mouseUpEvent);};_addEvent(dialogHeaderEl, 'mousedown', mouseDownEvent);}
}

使用

<div class="simple-drag" v-drag="{dragElSelector: '.simple-drag'}"><div class="simple-drag-header"><h4 class="simple-drag-title">简单拖拽</h4><button type="button" class="close-btn">×</button></div>
</div>

以上就是直播系统开发，vue拖拽元素指令， 更多内容欢迎关注之后的文章