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import Vue from 'vue';
// v-dialogDrag: 彈窗拖拽屬性
Vue.directive('dialogDrag', {
bind(el, binding, vnode, oldVnode) {
const dialogHeaderEl = el.querySelector('.el-dialog__header');
const dragDom = el.querySelector('.el-dialog');
//dialogHeaderEl.style.cursor = 'move';
dialogHeaderEl.style.cssText += ';cursor:move;'
dragDom.style.cssText += ';top:0px;'
// 獲取原有屬性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
const sty = (function() {
if (window.document.currentStyle) {
return (dom, attr) => dom.currentStyle[attr];
} else{
return (dom, attr) => getComputedStyle(dom, false)[attr];
}
})()
dialogHeaderEl.onmousedown = (e) => {
// 鼠標按下，計算當前元素距離可視區的距離
const disX = e.clientX - dialogHeaderEl.offsetLeft;
const disY = e.clientY - dialogHeaderEl.offsetTop;
const screenWidth = document.body.clientWidth; // body當前寬度
const screenHeight = document.documentElement.clientHeight; // 可見區域高度(應爲body高度，可某些環境下無法獲取)
const dragDomWidth = dragDom.offsetWidth; // 對話框寬度
const dragDomheight = dragDom.offsetHeight; // 對話框高度
const minDragDomLeft = dragDom.offsetLeft;
const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
const minDragDomTop = dragDom.offsetTop;
const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight;
// 獲取到的值帶px 正則匹配替換
let styL = sty(dragDom, 'left');
let styT = sty(dragDom, 'top');
// 注意在ie中 第一次獲取到的值爲組件自帶50% 移動之後賦值爲px
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, '');
};
document.onmousemove = function (e) {
// 通過事件委託，計算移動的距離
let left = e.clientX - disX;
let top = e.clientY - disY;
// 邊界處理
if (-(left) > minDragDomLeft) {
left = -(minDragDomLeft);
} else if (left > maxDragDomLeft) {
left = maxDragDomLeft;
}
if (-(top) > minDragDomTop) {
top = -(minDragDomTop);
} else if (top > maxDragDomTop) {
top = maxDragDomTop;
}
// 移動當前元素
dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`;
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
}
})
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