refactor: rename the atom directory to shell

shell/browser/ui/drag_util_mac.mm

@@ -0,0 +1,61 @@
+// Copyright (c) 2016 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#import <Cocoa/Cocoa.h>
+
+#include <vector>
+
+#include "atom/browser/ui/drag_util.h"
+#include "base/files/file_path.h"
+#include "base/strings/sys_string_conversions.h"
+
+namespace atom {
+
+namespace {
+
+// Write information about the file being dragged to the pasteboard.
+void AddFilesToPasteboard(NSPasteboard* pasteboard,
+                          const std::vector<base::FilePath>& files) {
+  NSMutableArray* fileList = [NSMutableArray array];
+  for (const base::FilePath& file : files)
+    [fileList addObject:base::SysUTF8ToNSString(file.value())];
+  [pasteboard declareTypes:[NSArray arrayWithObject:NSFilenamesPboardType]
+                     owner:nil];
+  [pasteboard setPropertyList:fileList forType:NSFilenamesPboardType];
+}
+
+}  // namespace
+
+void DragFileItems(const std::vector<base::FilePath>& files,
+                   const gfx::Image& icon,
+                   gfx::NativeView view) {
+  NSPasteboard* pasteboard = [NSPasteboard pasteboardWithName:NSDragPboard];
+  AddFilesToPasteboard(pasteboard, files);
+
+  // Synthesize a drag event, since we don't have access to the actual event
+  // that initiated a drag (possibly consumed by the Web UI, for example).
+  NSWindow* window = [view.GetNativeNSView() window];
+  NSPoint position = [window mouseLocationOutsideOfEventStream];
+  NSTimeInterval eventTime = [[NSApp currentEvent] timestamp];
+  NSEvent* dragEvent = [NSEvent mouseEventWithType:NSLeftMouseDragged
+                                          location:position
+                                     modifierFlags:NSLeftMouseDraggedMask
+                                         timestamp:eventTime
+                                      windowNumber:[window windowNumber]
+                                           context:nil
+                                       eventNumber:0
+                                        clickCount:1
+                                          pressure:1.0];
+
+  // Run the drag operation.
+  [window dragImage:icon.ToNSImage()
+                 at:position
+             offset:NSZeroSize
+              event:dragEvent
+         pasteboard:pasteboard
+             source:view.GetNativeNSView()
+          slideBack:YES];
+}
+
+}  // namespace atom