fork from https://github.com/mozilla/pdf.js.git

web/print_utils.js

@@ -0,0 +1,61 @@
+/* Copyright 2021 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { PixelsPerInch, XfaLayer } from "pdfjs-lib";
+import { SimpleLinkService } from "./pdf_link_service.js";
+import { XfaLayerBuilder } from "./xfa_layer_builder.js";
+
+class BasePrintServiceFactory {
+  constructor() {
+    if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
+      throw new Error("Cannot initialize BasePrintServiceFactory.");
+    }
+  }
+
+  static initGlobals(app) {}
+
+  static get supportsPrinting() {
+    throw new Error("Not implemented: supportsPrinting");
+  }
+
+  static createPrintService(params) {
+    throw new Error("Not implemented: createPrintService");
+  }
+}
+
+function getXfaHtmlForPrinting(printContainer, pdfDocument) {
+  const xfaHtml = pdfDocument.allXfaHtml;
+  const linkService = new SimpleLinkService();
+  const scale = Math.round(PixelsPerInch.PDF_TO_CSS_UNITS * 100) / 100;
+
+  for (const xfaPage of xfaHtml.children) {
+    const page = document.createElement("div");
+    page.className = "xfaPrintedPage";
+    printContainer.append(page);
+
+    const builder = new XfaLayerBuilder({
+      pdfPage: null,
+      annotationStorage: pdfDocument.annotationStorage,
+      linkService,
+      xfaHtml: xfaPage,
+    });
+    const viewport = XfaLayer.getPageViewport(xfaPage, { scale });
+
+    builder.render({ viewport, intent: "print" });
+    page.append(builder.div);
+  }
+}
+
+export { BasePrintServiceFactory, getXfaHtmlForPrinting };