Move the getXfaHtmlForPrinting helper function to its own file (PR 13411 follow-up)

The `web/ui_utils.js` file should be usable from basically anywhere in the `web/`-folder, hence it should ideally not have any dependecies on its own and particularily *not* onces that pull in entire (large) factories.

web/firefox_print_service.js

@@ -14,7 +14,7 @@
  */
 
 import { RenderingCancelledException, shadow } from "pdfjs-lib";
-import { getXfaHtmlForPrinting } from "./ui_utils.js";
+import { getXfaHtmlForPrinting } from "./print_utils.js";
 import { PDFPrintServiceFactory } from "./app.js";
 
 // Creates a placeholder with div and canvas with right size for the page.

web/pdf_print_service.js

@@ -14,7 +14,7 @@
  */
 
 import { PDFPrintServiceFactory, PDFViewerApplication } from "./app.js";
-import { getXfaHtmlForPrinting } from "./ui_utils.js";
+import { getXfaHtmlForPrinting } from "./print_utils.js";
 import { viewerCompatibilityParams } from "./viewer_compatibility.js";
 
 let activeService = null;

web/print_utils.js

@@ -0,0 +1,42 @@
+/* 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 { CSS_UNITS } from "./ui_utils.js";
+import { DefaultXfaLayerFactory } from "./xfa_layer_builder.js";
+
+function getXfaHtmlForPrinting(printContainer, pdfDocument) {
+  const xfaHtml = pdfDocument.allXfaHtml;
+  const factory = new DefaultXfaLayerFactory();
+  const scale = Math.round(CSS_UNITS * 100) / 100;
+  for (const xfaPage of xfaHtml.children) {
+    const page = document.createElement("div");
+    page.className = "xfaPrintedPage";
+    printContainer.appendChild(page);
+
+    const { width, height } = xfaPage.attributes.style;
+    const viewBox = [0, 0, parseInt(width), parseInt(height)];
+    const viewport = { viewBox, scale, rotation: 0 };
+
+    const builder = factory.createXfaLayerBuilder(
+      /* pageDiv = */ page,
+      /* pdfPage = */ null,
+      /* annotationStorage = */ pdfDocument.annotationStorage,
+      /* xfaHtml = */ xfaPage
+    );
+    builder.render(viewport, "print");
+  }
+}
+
+export { getXfaHtmlForPrinting };

web/ui_utils.js

@@ -13,8 +13,6 @@
  * limitations under the License.
  */
 
-import { DefaultXfaLayerFactory } from "./xfa_layer_builder.js";
-
 const CSS_UNITS = 96.0 / 72.0;
 const DEFAULT_SCALE_VALUE = "auto";
 const DEFAULT_SCALE = 1.0;
@@ -995,29 +993,6 @@ function apiPageModeToSidebarView(mode) {
   return SidebarView.NONE; // Default value.
 }
 
-function getXfaHtmlForPrinting(printContainer, pdfDocument) {
-  const xfaHtml = pdfDocument.allXfaHtml;
-  const factory = new DefaultXfaLayerFactory();
-  const scale = Math.round(CSS_UNITS * 100) / 100;
-  for (const xfaPage of xfaHtml.children) {
-    const page = document.createElement("div");
-    page.className = "xfaPrintedPage";
-    printContainer.appendChild(page);
-
-    const { width, height } = xfaPage.attributes.style;
-    const viewBox = [0, 0, parseInt(width), parseInt(height)];
-    const viewport = { viewBox, scale, rotation: 0 };
-
-    const builder = factory.createXfaLayerBuilder(
-      page,
-      null,
-      pdfDocument.annotationStorage,
-      xfaPage
-    );
-    builder.render(viewport, "print");
-  }
-}
-
 export {
   animationStarted,
   apiPageLayoutToSpreadMode,
@@ -1034,7 +1009,6 @@ export {
   getOutputScale,
   getPageSizeInches,
   getVisibleElements,
-  getXfaHtmlForPrinting,
   isPortraitOrientation,
   isValidRotation,
   isValidScrollMode,