107 lines
3.5 KiB
TypeScript
107 lines
3.5 KiB
TypeScript
/*
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需求：给整个页面添加背景水印。
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思路：
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1、使用 canvas 特性生成 base64 格式的图片文件，设置其字体大小，颜色等。
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2、将其设置为背景图片，从而实现页面或组件水印效果
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使用：设置水印文案，颜色，字体大小即可
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<div v-waterMarker="{text:'版权所有',textColor:'rgba(180, 180, 180, 0.4)'}"></div>
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*/
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// watermark 样式
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let style = `
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display: block;
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overflow: hidden;
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position: absolute;
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left: 0;
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top: 0;
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width: 100%;
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height: 100%;
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background-repeat: repeat;
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pointer-events: none;
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`;
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let systemConfig = {};
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import type { Directive, DirectiveBinding } from "vue";
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import { getSystemConfig } from "@/api/modules/jxjview";
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// 获取系统配置水印
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const getConfigMarker = async () => {
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// 获取起重机械设备类型字典
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const { result } = await getSystemConfig({ configKey: "system_watermark" });
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systemConfig = result;
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console.log(result);
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};
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// 设置水印
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const addWaterMarker = (parentNode: any, binding: any = {}) => {
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console.log(binding);
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// 水印文字，父元素，字体，文字颜色
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let can: HTMLCanvasElement = document.createElement("canvas");
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let changeStyle = ""; // 需要修改的样式
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parentNode.appendChild(can);
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can.width = 205;
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can.height = 140;
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can.style.display = "none";
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let cans = can.getContext("2d") as CanvasRenderingContext2D;
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cans.rotate((-20 * Math.PI) / 180);
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cans.font = binding.font || "16px Microsoft JhengHei";
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cans.fillStyle = binding.textColor || "rgba(180, 180, 180, 0.3)";
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cans.textAlign = "left";
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cans.textBaseline = "Middle" as CanvasTextBaseline;
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cans.fillText(binding.configValue, can.width / 10, can.height / 2);
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// 创建waterMark父元素
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const waterMark = document.createElement("div");
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waterMark.className = `water-mark`; // 方便自定义展示结果
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changeStyle = `${style}background-image: url(${can.toDataURL("image/png")})`;
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waterMark.setAttribute("style", changeStyle);
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// 将对应图片的父容器作为定位元素
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parentNode.setAttribute("style", "position:relative;");
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// 将图片元素移动到waterMark中
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parentNode.appendChild(waterMark);
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// parentNode.style.backgroundImage = "url(" + can.toDataURL("image/png") + ")";
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};
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const waterMarker = {
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mounted(el: HTMLElement, binding: any) {
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console.log(666);
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new Promise(async (resolve, reject) => {
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await getConfigMarker();
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resolve("success");
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}).then(res => {
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el.onload = init(el, systemConfig);
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});
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// addWaterMarker(binding.value.text, el, binding.value.font, binding.value.textColor);
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}
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};
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// 监听DOM变化
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const createObserver = (el: HTMLElement, binding: any) => {
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const waterMarkEl = el.parentElement?.querySelector(".water-mark");
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const observer = new MutationObserver(mutationsList => {
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if (mutationsList.length) {
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const { removedNodes, type, target } = mutationsList[0];
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const currStyle = waterMarkEl?.getAttribute("style");
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// 证明被删除了
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if (removedNodes[0] === waterMarkEl) {
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observer.disconnect();
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init(el, systemConfig);
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} else if (type === "attributes" && target === waterMarkEl && currStyle !== style) {
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waterMarkEl.setAttribute("style", style);
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}
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}
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});
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observer.observe(el.parentElement, {
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childList: true,
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attributes: true,
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subtree: true
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});
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};
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const init = (el: HTMLElement, binding: any = {}) => {
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console.log(666);
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// 设置水印
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addWaterMarker(el, binding);
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// 启动监控
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createObserver(el, binding);
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};
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export default waterMarker;
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