Fix fonts issue in printing

The PDFJS library adds the fonts in the main document.fonts variable. So we need to passed those fonts to the iframe.

Author: arioth

src/pdfjsWrapper.js

@@ -75,37 +75,30 @@ export default function(PDFJS) {
 			var PRINT_UNITS = PRINT_RESOLUTION / 72.0;
 			var CSS_UNITS = 96.0 / 72.0;
 
-			var iframeElt = document.createElement('iframe');
+			var printContainerElement = document.createElement('div');
 
-			function removeIframe() {
-
-				iframeElt.parentNode.removeChild(iframeElt);
+			function removePrintContainer() {
+				printContainerElement.parentNode.removeChild(printContainerElement);
 			}
 
 			new Promise(function(resolve, reject) {
-
-				iframeElt.frameBorder = '0';
-				iframeElt.scrolling = 'no';
-				iframeElt.width = '0px;'
-				iframeElt.height = '0px;'
-				iframeElt.style.cssText = 'position: absolute; top: 0; left: 0';
-
-				iframeElt.onload = function() {
-
-					resolve(this.contentWindow);
-				}
-
-				window.document.body.appendChild(iframeElt);
+				printContainerElement.frameBorder = '0';
+				printContainerElement.scrolling = 'no';
+				printContainerElement.width = '0px;'
+				printContainerElement.height = '0px;'
+				printContainerElement.style.cssText = 'position: absolute; top: 0; left: 0';
+
+				window.document.body.appendChild(printContainerElement);
+				resolve(window)
 			})
 			.then(function(win) {
 
 				win.document.title = '';
 
 				return pdfDoc.getPage(1)
 				.then(function(page) {
-
 					var viewport = page.getViewport(1);
-					win.document.head.appendChild(win.document.createElement('style')).textContent =
+					printContainerElement.appendChild(win.document.createElement('style')).textContent =
 						'@supports ((size:A4) and (size:1pt 1pt)) {' +
 							'@page { margin: 1pt; size: ' + ((viewport.width * PRINT_UNITS) / CSS_UNITS) + 'pt ' + ((viewport.height * PRINT_UNITS) / CSS_UNITS) + 'pt; }' +
 						'}' +
@@ -157,18 +150,16 @@ export default function(PDFJS) {
 
 				Promise.all(allPages)
 				.then(function() {
-
 					win.focus(); // Required for IE
 					if (win.document.queryCommandSupported('print')) {
 						win.document.execCommand('print', false, null);
-						} else {
+					} else {
 						win.print();
-					  }
-					removeIframe();
+					}
+					removePrintContainer();
 				})
 				.catch(function(err) {
-
-					removeIframe();
+					removePrintContainer();
 					emitEvent('error', err);
 				})
 			})