From 8e9550611696cf33172a864c934b6f58996356a6 Mon Sep 17 00:00:00 2001
From: Dimitris Kountanis <jimkountanis@gmail.com>
Date: Sun, 10 Jun 2018 15:39:06 +0200
Subject: [PATCH] Implement drag-and-drop support in the viewer for local files

---
 web/app.js | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/web/app.js b/web/app.js
index b9f3f1d62..57b1d82fd 100644
--- a/web/app.js
+++ b/web/app.js
@@ -1622,6 +1622,24 @@ function webViewerInitialized() {
         fileInput: evt.target,
       });
     });
+
+    // Enable draging-and-dropping a new PDF file onto the viewerContainer.
+    appConfig.mainContainer.addEventListener('dragover', function(evt) {
+      evt.preventDefault();
+
+      evt.dataTransfer.dropEffect = 'move';
+    });
+    appConfig.mainContainer.addEventListener('drop', function(evt) {
+      evt.preventDefault();
+
+      const files = evt.dataTransfer.files;
+      if (!files || files.length === 0) {
+        return;
+      }
+      PDFViewerApplication.eventBus.dispatch('fileinputchange', {
+        fileInput: evt.dataTransfer,
+      });
+    });
   } else {
     appConfig.toolbar.openFile.setAttribute('hidden', 'true');
     appConfig.secondaryToolbar.openFileButton.setAttribute('hidden', 'true');