WebDev/VersaWhiteboard
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improve performance of pdf to image function

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This commit is contained in:
raphael 2020-04-29 16:01:22 +02:00
parent c86ee45f11
commit d173c7728c
1 changed files with 39 additions and 41 deletions
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30
src/js/main.js
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@ -4,8 +4,7 @@ import whiteboard from "./whiteboard";
import keybinds from "./keybinds"; import keybinds from "./keybinds";
import Picker from "vanilla-picker"; import Picker from "vanilla-picker";
import { dom } from "@fortawesome/fontawesome-svg-core"; import { dom } from "@fortawesome/fontawesome-svg-core";
import pdfjsLib from "pdfjs-dist/build/pdf"; import pdfjsLib from "pdfjs-dist/webpack";
import pdfjsLibWorker from "pdfjs-dist/build/pdf.worker";
function main() { function main() {
@ -477,18 +476,21 @@ function main() {
const base64data = reader.result; const base64data = reader.result;
uploadImgAndAddToWhiteboard(base64data); uploadImgAndAddToWhiteboard(base64data);
} }
} else if (isPDFFileName(filename)) { } else if (isPDFFileName(filename)) { //Handle PDF Files
var blob = e.originalEvent.dataTransfer.files[0]; var blob = e.originalEvent.dataTransfer.files[0];
pdfjsLib.GlobalWorkerOptions.workerSrc = pdfjsLibWorker;
var reader = new window.FileReader(); var reader = new window.FileReader();
reader.onloadend = function () { reader.onloadend = function () {
var pdfData = new Uint8Array(this.result); var pdfData = new Uint8Array(this.result);
var loadingTask = pdfjsLib.getDocument({ data: pdfData });
loadingTask.promise.then(function (pdf) {
console.log('PDF loaded');
var currentDataUrl = null; var currentDataUrl = null;
var modalDiv = $('<div>' + var modalDiv = $('<div>' +
'Page: <select></select>' + 'Page: <select></select> ' +
'<br><button>Upload to Whiteboard</button>' + '<button style="margin-bottom: 3px;" class="modalBtn"><i class="fas fa-upload"></i> Upload to Whiteboard</button>' +
'<img style="width:100%;" src=""/>' + '<img style="width:100%;" src=""/>' +
'</div>') '</div>')
@ -503,6 +505,10 @@ function main() {
} }
}) })
for (var i = 1; i < pdf.numPages + 1; i++) {
modalDiv.find("select").append('<option value="' + i + '">' + i + '</option>')
}
showBasicAlert(modalDiv, { showBasicAlert(modalDiv, {
header: "Pdf to Image", header: "Pdf to Image",
okBtnText: "cancel", okBtnText: "cancel",
@ -511,15 +517,6 @@ function main() {
showPDFPageAsImage(1); showPDFPageAsImage(1);
function showPDFPageAsImage(pageNumber) { function showPDFPageAsImage(pageNumber) {
var loadingTask = pdfjsLib.getDocument({ data: pdfData });
loadingTask.promise.then(function (pdf) {
console.log('PDF loaded');
if (!currentDataUrl) { //First load
for (var i = 1; i < pdf.numPages + 1; i++) {
modalDiv.find("select").append('<option value="' + i + '">' + i + '</option>')
}
}
// Fetch the page // Fetch the page
pdf.getPage(pageNumber).then(function (page) { pdf.getPage(pageNumber).then(function (page) {
@ -549,6 +546,7 @@ function main() {
}); });
}); });
}
}, function (reason) { }, function (reason) {
// PDF loading error // PDF loading error
@ -556,7 +554,7 @@ function main() {
showBasicAlert("Error loading pdf as image! Check that this is a vaild pdf file!"); showBasicAlert("Error loading pdf as image! Check that this is a vaild pdf file!");
console.error(reason); console.error(reason);
}); });
}
} }
reader.readAsArrayBuffer(blob); reader.readAsArrayBuffer(blob);
} else { } else {