viewer: fix loading from URL (for demo file)

2 files changed, 16 insertions, 5 deletions

diff --git a/beamer/viewer/init.js b/beamer/viewer/init.js
index 18269cd..6190386 100644
--- a/beamer/viewer/init.js
+++ b/beamer/viewer/init.js
@@ -45,7 +45,7 @@ function init() {
   const viewer = new Viewer();
 
   if ("file" in params)
-    viewer.load(params["file"]);
+    viewer.loadFromUrl(params["file"]);
 }
 
 function load(file) {
diff --git a/beamer/viewer/viewer.js b/beamer/viewer/viewer.js
index 8101b02..e9c6d65 100644
--- a/beamer/viewer/viewer.js
+++ b/beamer/viewer/viewer.js
@@ -29,7 +29,7 @@ class Viewer {
     this._listenForInput();
   }
 
-  load(source) {
+  _preparePresentation(source) {
     const self = this;
     pdfjsLib.getDocument(source).then(function(pdf) {
       self.presentation = new Presentation(pdf);
@@ -43,18 +43,29 @@ class Viewer {
   _readFile(file) {
     const self = this;
     this.fileReader.onload = function() {
-      self._onFileLoaded(new Uint8Array(this.result));
+      self._setPresentation(new Uint8Array(this.result));
     }
 
     this.fileReader.abort();
     this.fileReader.readAsArrayBuffer(file);
   }
 
-  _onFileLoaded(bytes) {
-    this.load(bytes);
+  _setPresentation(presentation) {
+    this._preparePresentation(presentation);
     this.startButton.disabled = false;
   }
 
+  _setFileName(name) {
+    const dummy = new DataTransfer();
+    dummy.items.add(new File([], name));
+    this.fileInput.files = dummy.files;
+  }
+
+  loadFromUrl(url) {
+    this._setFileName(url);
+    this._setPresentation(url);
+  }
+
   _listenForInput() {
     const self = this;
     fileInput.addEventListener("change", function(event) {