el-dialog弹出层拖拽及拉伸、双击全屏

Vue.directive(‘dialogDragAndChangSize‘, {

    bind(el, binding, vnode) {
        // 弹框可拉伸最小宽高

        const minWidth = 400;

        const minHeight = 300;

        // 初始非全屏

        let isFullScreen = false;

        // 当前宽高

        let nowWidth = 0;

        // let nowHight = 0;

        // 当前顶部高度

        let nowMarginTop = 0;

        // 获取弹框头部（这部分可双击全屏）

        const dialogHeaderEl = el.querySelector(‘.el-dialog__header‘);

        // 弹窗

        const dragDom = el.querySelector(‘.el-dialog‘);

        // 给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；

        dragDom.style.overflow = ‘auto‘;

        // 清除选择头部文字效果

        // dialogHeaderEl.onselectstart = new Function("return false");

        // 头部加上可拖动cursor

        dialogHeaderEl.style.cursor = ‘move‘;

        // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);

        const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

        const moveDown = (e) => {
            // 鼠标按下，计算当前元素距离可视区的距离

            const disX = e.clientX - dialogHeaderEl.offsetLeft;

            const disY = e.clientY - dialogHeaderEl.offsetTop;

            // 获取到的值带px 正则匹配替换

            let styL, styT;

            // 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

            if (sty.left.includes(‘%‘)) {
                styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, ‘‘) / 100);

                styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, ‘‘) / 100);
            } else {
                styL = +sty.left.replace(/\px/g, ‘‘);

                styT = +sty.top.replace(/\px/g, ‘‘);
            };

            document.onmousemove = function(e) {
                // 通过事件委托，计算移动的距离

                const l = e.clientX - disX;

                const t = e.clientY - disY;

                // 移动当前元素

                dragDom.style.left = `${l + styL}px`;

                dragDom.style.top = `${t + styT}px`;

                // 将此时的位置传出去

                // binding.value({x:e.pageX,y:e.pageY})
            };

            document.onmouseup = () => {
                document.onmousemove = null;

                document.onmouseup = null;
            };
        }

        dialogHeaderEl.onmousedown = moveDown;

        const top = el.style.top

        // 双击头部全屏效果

        dialogHeaderEl.ondblclick = () => {
            if (isFullScreen === false) {
                el.style.top = 0
                // nowHight = dragDom.clientHeight;

                nowWidth = dragDom.clientWidth;

                nowMarginTop = dragDom.style.marginTop;

                dragDom.style.left = 0;

                dragDom.style.top = 0;

                dragDom.style.height = ‘100VH‘;

                dragDom.style.width = ‘100VW‘;

                dragDom.style.marginTop = 0;

                isFullScreen = true;

                dialogHeaderEl.style.cursor = ‘initial‘;

                dialogHeaderEl.onmousedown = null;
            } else {
                el.style.top = top

                dragDom.style.height = ‘auto‘;

                dragDom.style.width = nowWidth + ‘px‘;

                dragDom.style.marginTop = nowMarginTop;

                isFullScreen = false;

                dialogHeaderEl.style.cursor = ‘move‘;

                dialogHeaderEl.onmousedown = moveDown;
            }
            vnode.context[binding.expression] = isFullScreen;
        }

        dragDom.onmousemove = (e) => {
            // const moveE = e;

            if (e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10 || dragDom.offsetLeft + 10 > e.clientX) {
                dragDom.style.cursor = ‘w-resize‘;
            } else if (el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) {
                dragDom.style.cursor = ‘s-resize‘;
            } else {
                dragDom.style.cursor = ‘auto‘;
                return
                // dragDom.onmousedown = null;
            }

            dragDom.onmousedown = (e) => {
                const clientX = e.clientX;

                const clientY = e.clientY;

                const elW = dragDom.clientWidth;

                const elH = dragDom.clientHeight;

                const EloffsetLeft = dragDom.offsetLeft;

                const EloffsetTop = dragDom.offsetTop;

                dragDom.style.userSelect = ‘auto‘;

                const ELscrollTop = el.scrollTop;

                // 判断点击的位置是不是为头部

                if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) {

                    // 如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown;

                } else {
                    document.onmousemove = (e) => {
                        e.preventDefault(); // 移动时禁用默认事件

                        // 左侧鼠标拖拽位置

                        if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {
                            // 往左拖拽

                            if (clientX > e.clientX) {
                                dragDom.style.width = elW + (clientX - e.clientX) * 2 + ‘px‘;
                            }

                            // 往右拖拽

                            if (clientX < e.clientX) {
                                if (dragDom.clientWidth < minWidth) {

                                } else {
                                    dragDom.style.width = elW - (e.clientX - clientX) * 2 + ‘px‘;
                                }
                            }
                        }

                        // 右侧鼠标拖拽位置

                        if (clientX > EloffsetLeft + elW - 10 && clientX < EloffsetLeft + elW) {
                            // 往左拖拽

                            if (clientX > e.clientX) {
                                if (dragDom.clientWidth < minWidth) {

                                } else {
                                    dragDom.style.width = elW - (clientX - e.clientX) * 2 + ‘px‘;
                                }
                            }

                            // 往右拖拽

                            if (clientX < e.clientX) {
                                dragDom.style.width = elW + (e.clientX - clientX) * 2 + ‘px‘;
                            }
                        }

                        // 底部鼠标拖拽位置

                        if (ELscrollTop + clientY > EloffsetTop + elH - 20 && ELscrollTop + clientY < EloffsetTop + elH) {
                            // 往上拖拽

                            if (clientY > e.clientY) {
                                if (dragDom.clientHeight < minHeight) {

                                } else {
                                    dragDom.style.height = elH - (clientY - e.clientY) * 2 + ‘px‘;
                                }
                            }

                            // 往下拖拽

                            if (clientY < e.clientY) {
                                dragDom.style.height = elH + (e.clientY - clientY) * 2 + ‘px‘;
                            }
                        }
                    };

                    // 拉伸结束

                    document.onmouseup = () => {
                        document.onmousemove = null;

                        document.onmouseup = null;
                    };
                }
            }
        }
    }

})