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frontend/node_modules/antd/es/watermark/useWatermark.js

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+import * as React from 'react';
+import { getStyleStr } from './utils';
+/**
+ * Base size of the canvas, 1 for parallel layout and 2 for alternate layout
+ * Only alternate layout is currently supported
+ */
+export const BaseSize = 2;
+export const FontGap = 3;
+// Prevent external hidden elements from adding accent styles
+const emphasizedStyle = {
+  visibility: 'visible !important'
+};
+export default function useWatermark(markStyle) {
+  const watermarkMap = React.useRef(new Map());
+  const appendWatermark = (base64Url, markWidth, container) => {
+    if (container) {
+      if (!watermarkMap.current.get(container)) {
+        const newWatermarkEle = document.createElement('div');
+        watermarkMap.current.set(container, newWatermarkEle);
+      }
+      const watermarkEle = watermarkMap.current.get(container);
+      watermarkEle.setAttribute('style', getStyleStr(Object.assign(Object.assign(Object.assign({}, markStyle), {
+        backgroundImage: `url('${base64Url}')`,
+        backgroundSize: `${Math.floor(markWidth)}px`
+      }), emphasizedStyle)));
+      // Prevents using the browser `Hide Element` to hide watermarks
+      watermarkEle.removeAttribute('class');
+      watermarkEle.removeAttribute('hidden');
+      if (watermarkEle.parentElement !== container) {
+        container.append(watermarkEle);
+      }
+    }
+    return watermarkMap.current.get(container);
+  };
+  const removeWatermark = container => {
+    const watermarkEle = watermarkMap.current.get(container);
+    if (watermarkEle && container) {
+      container.removeChild(watermarkEle);
+    }
+    watermarkMap.current.delete(container);
+  };
+  const isWatermarkEle = ele => Array.from(watermarkMap.current.values()).includes(ele);
+  return [appendWatermark, removeWatermark, isWatermarkEle];
+}