Cocoa: Use NSURLs for drag and drop

Fixes #1377.

src/cocoa_window.m

@@ -51,7 +51,6 @@
 #endif
 
 #if MAC_OS_X_VERSION_MAX_ALLOWED < 101300
- #define NSPasteboardTypeFileURL NSFilenamesPboardType
  #define NSPasteboardTypeString NSStringPboardType
 #endif
 
@@ -442,8 +441,9 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
         markedText = [[NSMutableAttributedString alloc] init];
 
         [self updateTrackingAreas];
-        [self registerForDraggedTypes:[NSArray arrayWithObjects:
-                                       NSPasteboardTypeFileURL, nil]];
+        // NOTE: kUTTypeURL corresponds to NSPasteboardTypeURL but is available
+        //       on 10.7 without having been deprecated yet
+        [self registerForDraggedTypes:@[(__bridge NSString*) kUTTypeURL]];
     }
 
     return self;
@@ -713,45 +713,33 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
 
 - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
 {
-    if ((NSDragOperationGeneric & [sender draggingSourceOperationMask])
-        == NSDragOperationGeneric)
-    {
-        [self setNeedsDisplay:YES];
-        return NSDragOperationGeneric;
-    }
-
-    return NSDragOperationNone;
-}
-
-- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender
-{
-    [self setNeedsDisplay:YES];
-    return YES;
+    // HACK: We don't know what to say here because we don't know what the
+    //       application wants to do with the paths
+    return NSDragOperationGeneric;
 }
 
 - (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
 {
-    NSPasteboard* pasteboard = [sender draggingPasteboard];
-    NSArray* files = [pasteboard propertyListForType:NSPasteboardTypeFileURL];
-
     const NSRect contentRect = [window->ns.view frame];
     _glfwInputCursorPos(window,
                         [sender draggingLocation].x,
                         contentRect.size.height - [sender draggingLocation].y);
 
-    const NSUInteger count = [files count];
+    NSPasteboard* pasteboard = [sender draggingPasteboard];
+    NSDictionary* options = @{NSPasteboardURLReadingFileURLsOnlyKey:@YES};
+    NSArray* urls = [pasteboard readObjectsForClasses:@[[NSURL class]]
+                                              options:options];
+    const NSUInteger count = [urls count];
     if (count)
     {
-        NSEnumerator* e = [files objectEnumerator];
         char** paths = calloc(count, sizeof(char*));
-        NSUInteger i;
 
-        for (i = 0;  i < count;  i++)
-            paths[i] = _glfw_strdup([[e nextObject] UTF8String]);
+        for (NSUInteger i = 0;  i < count;  i++)
+            paths[i] = _glfw_strdup([[urls objectAtIndex:i] fileSystemRepresentation]);
 
         _glfwInputDrop(window, (int) count, (const char**) paths);
 
-        for (i = 0;  i < count;  i++)
+        for (NSUInteger i = 0;  i < count;  i++)
             free(paths[i]);
         free(paths);
     }
@@ -759,11 +747,6 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
     return YES;
 }
 
-- (void)concludeDragOperation:(id <NSDraggingInfo>)sender
-{
-    [self setNeedsDisplay:YES];
-}
-
 - (BOOL)hasMarkedText
 {
     return [markedText length] > 0;