From bb9f98e4352a0041fa2595eaa274b53c6047eb23 Mon Sep 17 00:00:00 2001
From: DanyaPostfactum <danya.postfactum@gmail.com>
Date: Wed, 6 Feb 2013 12:56:19 +1000
Subject: [PATCH] Detect file dragging

---
 demo/kitchen-sink/demo.js | 4 +++-
 lib/ace/mouse/dragdrop.js | 9 +++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/demo/kitchen-sink/demo.js b/demo/kitchen-sink/demo.js
index 4bc1c35e..812baaa9 100644
--- a/demo/kitchen-sink/demo.js
+++ b/demo/kitchen-sink/demo.js
@@ -397,7 +397,9 @@ bindCheckbox("highlight_token", function(checked) {
 
 /************** dragover ***************************/
 event.addListener(container, "dragover", function(e) {
-    return event.preventDefault(e);
+    var types = e.dataTransfer.types;
+    if (types && Array.prototype.indexOf.call(types, 'Files') !== -1)
+        return event.preventDefault(e);
 });
 
 event.addListener(container, "drop", function(e) {
diff --git a/lib/ace/mouse/dragdrop.js b/lib/ace/mouse/dragdrop.js
index 88f526b5..b5c5b167 100644
--- a/lib/ace/mouse/dragdrop.js
+++ b/lib/ace/mouse/dragdrop.js
@@ -43,6 +43,9 @@ var DragdropHandler = function(mouseHandler) {
     event.addListener(mouseTarget, "dragenter", function(e) {
         if (editor.getReadOnly())
             return;
+        var types = e.dataTransfer.types;
+        if (types && Array.prototype.indexOf.call(types, 'Files') !== -1)
+            return;
         counter++;
         if (!dragSelectionMarker) {
             range = editor.getSelectionRange();
@@ -59,6 +62,9 @@ var DragdropHandler = function(mouseHandler) {
     event.addListener(mouseTarget, "dragover", function(e) {
         if (editor.getReadOnly())
             return;
+        var types = e.dataTransfer.types;
+        if (types && Array.prototype.indexOf.call(types, 'Files') !== -1)
+            return;
         x = e.clientX;
         y = e.clientY;
         return event.preventDefault(e);
@@ -73,6 +79,9 @@ var DragdropHandler = function(mouseHandler) {
     event.addListener(mouseTarget, "dragleave", function(e) {
         if (editor.getReadOnly())
             return;
+        var types = e.dataTransfer.types;
+        if (types && Array.prototype.indexOf.call(types, 'Files') !== -1)
+            return;
         counter--;
         if (counter > 0)
             return;