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107 lines
3.1 KiB
JavaScript
107 lines
3.1 KiB
JavaScript
/*
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* 水印
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*
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* @Author: 1024创新实验室-主任：卓大
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* @Date: 2022-09-06 20:50:10
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* @Wechat: zhuda1024
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* @Email: lab1024@163.com
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* @Copyright 1024创新实验室 （ https://1024lab.net ），Since 2012
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*/
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import dayjs from 'dayjs';
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/**
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* 水印DOM id
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*/
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const WATER_MARK_DOM_ID = 'smart_admin_water_mark';
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let smartAdminWaterMarkIntervalId = null;
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/**
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*
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* 因为modal的z-index为1000，所以为了modal的黑色背景隐藏掉，z-index为 999
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*
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* @param id
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* @param str
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* @returns
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*/
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function setWatermark(id, str) {
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//删掉之前的水印
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if (document.getElementById(WATER_MARK_DOM_ID) !== null) {
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document.getElementById(WATER_MARK_DOM_ID).remove();
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}
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str = str + ' ' + dayjs().format('YYYY-MM-DD HH:mm');
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//创建一个画布
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const can = document.createElement('canvas');
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//设置画布的长宽
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can.width = 400;
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can.height = 200;
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const cans = can.getContext('2d');
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//旋转角度
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cans.rotate((-15 * Math.PI) / 150);
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cans.font = '16px Microsoft JhengHei';
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//设置填充绘画的颜色、渐变或者模式
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cans.fillStyle = 'rgba(190, 190, 190, 0.30)';
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//设置文本内容的当前对齐方式
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cans.textAlign = 'left';
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//设置在绘制文本时使用的当前文本基线
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cans.textBaseline = 'middle';
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//在画布上绘制填色的文本（输出的文本，开始绘制文本的X坐标位置，开始绘制文本的Y坐标位置）
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cans.fillText(str, can.width / 8, can.height / 2);
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const div = document.createElement('div');
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div.id = WATER_MARK_DOM_ID;
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div.style.pointerEvents = 'none';
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div.style.top = '0px';
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div.style.left = '0px';
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div.style.position = 'absolute';
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div.style.zIndex = '99';
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div.style.width = '100%';
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div.style.height = '100%';
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div.style.background = 'url(' + can.toDataURL('image/png') + ') left top repeat';
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document.getElementById(id).appendChild(div);
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}
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const watermark = {
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show: function () {
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document.getElementById(WATER_MARK_DOM_ID).style.display = 'block';
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},
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hide: function () {
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document.getElementById(WATER_MARK_DOM_ID).style.display = 'hide';
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},
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// 该方法只允许调用一次
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set: function (id, str) {
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// 如果存在水印，则不允许再调用了
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if (document.getElementById(WATER_MARK_DOM_ID) !== null) {
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return;
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}
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setWatermark(id, str);
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//每隔1分钟检查一次水印
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smartAdminWaterMarkIntervalId = setInterval(() => {
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setWatermark(id, str);
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}, 60000);
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window.onresize = () => {
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setWatermark(id, str);
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};
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},
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// 清空水印
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clear: function () {
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let watermarkDom = document.getElementById(WATER_MARK_DOM_ID);
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if (watermarkDom) {
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watermarkDom.remove();
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}
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window.removeEventListener('resize', setWatermark);
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if (smartAdminWaterMarkIntervalId) {
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clearInterval(smartAdminWaterMarkIntervalId);
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smartAdminWaterMarkIntervalId = null;
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}
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},
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};
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export default watermark;
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