// 拖拽的指令
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const drag = {
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beforeMount(el: any, binding: any) {
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// 自定义属性，判断是否可拖拽
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if (!binding.value) return;
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const dialogHeaderEl = el.querySelector(".dialog_header_move");
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const dragDom = el.querySelector(".dialog_content");
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dialogHeaderEl.style.cssText += ";cursor:move;";
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// dragDom.style.cssText += ';bottom:0px;'
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// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
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const sty = (function () {
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if ((document.body as any).currentStyle) {
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// 在ie下兼容写法
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return (dom: any, attr: any) => dom.currentStyle[attr];
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}
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return (dom: any, attr: any) => getComputedStyle(dom, null)[attr];
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})();
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dialogHeaderEl.onmousedown = (e: any) => {
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//过滤掉 input textarea
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if (e.target.nodeName == "INPUT" || e.target.nodeName == "TEXTAREA") {
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return;
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}
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// 鼠标按下，计算当前元素距离可视区的距离
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const disX = e.clientX - dialogHeaderEl.offsetLeft;
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const disY = e.clientY - dialogHeaderEl.offsetTop;
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const screenWidth = document.body.clientWidth; // body当前宽度
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const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)
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const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
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const dragDomheight = dragDom.offsetHeight; // 对话框高度
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const minDragDomLeft = dragDom.offsetLeft;
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const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
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const minDragDomTop = dragDom.offsetTop;
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const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight;
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// 获取到的值带px 正则匹配替换
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let styL = sty(dragDom, "left");
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// 为兼容ie
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if (styL === "auto") styL = "0px";
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let styT = sty(dragDom, "top");
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// console.log(styL)
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// 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
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if (styL.includes("%")) {
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styL = +document.body.clientWidth * (+styL.replace(/%/g, "") / 100);
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styT = +document.body.clientHeight * (+styT.replace(/%/g, "") / 100);
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} else {
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styL = +styL.replace(/px/g, "");
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styT = +styT.replace(/px/g, "");
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}
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document.onmousemove = function (e) {
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// 通过事件委托，计算移动的距离
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let left = e.clientX - disX;
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let top = e.clientY - disY;
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// 边界处理
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if (-left > minDragDomLeft) {
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left = -minDragDomLeft;
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} else if (left > maxDragDomLeft) {
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left = maxDragDomLeft;
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}
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if (-top > minDragDomTop) {
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top = -minDragDomTop;
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} else if (top > maxDragDomTop) {
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top = maxDragDomTop;
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}
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// 移动当前元素
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dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`;
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};
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document.onmouseup = function (e: any) {
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document.onmousemove = null;
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document.onmouseup = null;
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};
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return false;
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};
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},
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};
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// 挂载，注册
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const directives = {
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install: function (app: any) {
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app.directive("dialogDrag", drag);
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},
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};
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export default directives;
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