signature: fully working app with pdfjs-dist

package.json

@@ -53,12 +53,12 @@
     "marked": "^12.0.2",
     "masonry-layout": "^4.2.2",
     "mime": "^4.0.0",
+    "pdfjs-dist": "^4.3.136",
     "swagger-ui": "^4.15.5",
     "vis-network": "^9.1.0",
     "vue": "^3.2.37",
     "vue-i18n": "^9.1.6",
     "vue-multiselect": "3.0.0-alpha.2",
-    "vue-pdf-embed": "^2.0.4",
     "vue-toast-notification": "^2.0",
     "vuex": "^4.0.0"
   },

src/Bundle/ChillDocStoreBundle/Resources/public/vuejs/DocumentSignature/App.vue

@@ -1,26 +1,25 @@
 <template>
-  <div>
-    <span>
-      <button :disabled="page <= 1" @click="unTurnPage">❮</button>
-      {{ page }} / {{ pageCount }}
-      <button :disabled="page >= pageCount" @click="turnPage">❯</button>
-    </span>
+  <div v-if="pageCount > 1">
+    <button :disabled="page <= 1" @click="unTurnPage">❮</button>
+    {{ page }} / {{ pageCount }}
+    <button :disabled="page >= pageCount" @click="turnPage">❯</button>
   </div>
-  <!-- <VuePdfEmbed :source="pdfSource" :page="page"/> -->
   <canvas id="canvas"></canvas>
 </template>
 
 <script setup lang="ts">
 import { ref, Ref } from "vue";
-// import VuePdfEmbed from "vue-pdf-embed";
-// import "vue-pdf-embed/dist/style/index.css";
 import { SignatureZone } from "../../types";
 import * as pdfjsLib from "pdfjs-dist";
+import {
+  PDFDocumentProxy,
+  PDFPageProxy,
+} from "pdfjs-dist/types/src/display/api";
 
 // @ts-ignore
-import * as PdfWorker from 'pdfjs-dist/build/pdf.worker.mjs';
-pdfjsLib.GlobalWorkerOptions.workerSrc = import.meta.url + 'pdfjs-dist/build/pdf.worker.mjs';
-console.log(PdfWorker) // incredible but this is needed
+import * as PdfWorker from "pdfjs-dist/build/pdf.worker.mjs";
+console.log(PdfWorker); // incredible but this is needed
+
 // import { PdfWorker } from 'pdfjs-dist/build/pdf.worker.mjs'
 // pdfjsLib.GlobalWorkerOptions.workerSrc = PdfWorker;
 
@@ -29,10 +28,13 @@ import {
   download_and_decrypt_doc,
 } from "../StoredObjectButton/helpers";
 
+pdfjsLib.GlobalWorkerOptions.workerSrc = "pdfjs-dist/build/pdf.worker.mjs";
+
 const page: Ref<number> = ref(1);
-const pageCount: Ref<number> = ref(3); //TODO get page count from PDF loaded, can be done with pdfjs (https://stackoverflow.com/questions/10253669/how-to-get-the-number-of-pages-of-a-pdf-uploaded-by-user)
+const pageCount: Ref<number> = ref(0);
 let userSignatureZones = {} as SignatureZone;
 let pdfSource: Ref<string> = ref("");
+let pdf = {} as PDFDocumentProxy;
 
 const signature = {
   id: 1,
@@ -86,31 +88,32 @@ const signature = {
 
 const urlInfo = build_download_info_link(signature.storedObject.filename);
 
-const showPdf = async (url: string) => {
+const mount_pdf = async (url: string) => {
   const loadingTask = pdfjsLib.getDocument(url);
-  const pdf = await loadingTask.promise;
-
-  // Load information from the first page.
-  const page = await pdf.getPage(1);
+  pdf = await loadingTask.promise;
+  pageCount.value = pdf.numPages;
+  await set_page(1);
+};
 
+const get_render_context = (pdfPage: PDFPageProxy) => {
   const scale = 1;
-  const viewport = page.getViewport({ scale });
-
-  // Apply page dimensions to the `<canvas>` element.
+  const viewport = pdfPage.getViewport({ scale });
   const canvas = document.querySelectorAll("canvas")[0] as HTMLCanvasElement;
   const context = canvas.getContext("2d") as CanvasRenderingContext2D;
   canvas.height = viewport.height;
   canvas.width = viewport.width;
 
-  // Render the page into the `<canvas>` element.
-  const renderContext = {
+  return {
     canvasContext: context,
     viewport: viewport,
   };
-  await page.render(renderContext);
-  console.log("Page rendered!");
 };
 
+const set_page = async (page: number) => {
+  const pdfPage = await pdf.getPage(page);
+  const renderContext = get_render_context(pdfPage);
+  await pdfPage.render(renderContext);
+};
 
 async function download_and_open(): Promise<Blob> {
   let raw;
@@ -120,12 +123,12 @@ async function download_and_open(): Promise<Blob> {
       signature.storedObject.keyInfos,
       new Uint8Array(signature.storedObject.iv)
     );
-    await showPdf(URL.createObjectURL(raw));
-    init_pdf();
   } catch (e) {
     console.error("error while downloading and decrypting document", e);
     throw e;
   }
+  await mount_pdf(URL.createObjectURL(raw));
+  init_pdf();
   return raw;
 }
 
@@ -136,7 +139,7 @@ const init_pdf = () => {
     (e: PointerEvent) => canvas_click(e),
     false
   );
-  setTimeout(() => add_zones(), 200);
+  setTimeout(() => add_zones(page.value), 800);
 };
 
 const canvas_click = (e: PointerEvent) => {
@@ -145,14 +148,16 @@ const canvas_click = (e: PointerEvent) => {
   userSignatureZones = signature.zones[0]; //TODO for now, need another way to select a zone
 };
 
-const turnPage = () => {
+const turnPage = async () => {
   page.value = page.value + 1;
-  setTimeout(() => add_zones(), 200);
+  await set_page(page.value);
+  setTimeout(() => add_zones(page.value), 200);
 };
 
-const unTurnPage = () => {
+const unTurnPage = async () => {
   page.value = page.value - 1;
-  setTimeout(() => add_zones(), 200);
+  await set_page(page.value);
+  setTimeout(() => add_zones(page.value), 200);
 };
 
 const draw_zone = (
@@ -171,20 +176,20 @@ const draw_zone = (
   );
 };
 
-const add_zones = () => {
+const add_zones = (page: number) => {
   const canvas = document.querySelectorAll("canvas")[0];
   const ctx = canvas.getContext("2d");
   if (ctx) {
     ctx.fillStyle = "green";
-    signature.zones.map((z) => {
-      if (z.page === page.value) {
-        draw_zone(z, ctx, canvas.width, canvas.height);
-      }
-    });
+    signature.zones
+      .filter((z) => z.page === page)
+      .map((z) => draw_zone(z, ctx, canvas.width, canvas.height));
   }
 };
 
+
 download_and_open();
+
 </script>
 
 <style lang="scss">