MacViews: Implemented Drag & Drop

ui/views/cocoa/cocoa_drag_drop_manager.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_VIEWS_COCOA_COCOA_DRAG_DROP_MANAGER_H_
+#define UI_VIEWS_COCOA_COCOA_DRAG_DROP_MANAGER_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include <memory>
+#include <vector>
+
+#import "base/mac/scoped_nsobject.h"
+#include "base/macros.h"
+#include "ui/base/dragdrop/drag_drop_types.h"
+#include "ui/views/views_export.h"
+#include "ui/views/widget/drop_helper.h"
+
+@class CocoaDragSourceProvider;
+class DropHelper;
+
+namespace gfx {
+class Point;
+}  // namespace gfx
+
+namespace ui {
+class OSExchangeData;
+}  // namespace ui
+using ui::OSExchangeData;
+
+namespace views {
+
+class BridgedNativeWidget;
+
+class VIEWS_EXPORT CocoaDragDropManager {

[tapted, 2016/05/11 12:36:15]

This class looks a lot like an aura::DragDropClient - we can't inherit from that
just yet, but down the line we will probably need a "DesktopDragDropClientMac"
similar to the one in
ui/views/widget/desktop_aura/desktop_drag_drop_client_win.h

So, it would be nice to keep the same nomenclature - e.g. call this a
DragDropClientMac and use similar method names.

[spqchan, 2016/05/23 21:26:21]

Sounds good. I renamed most of my methods according to DragDropClient.

+ public:
+  explicit CocoaDragDropManager(BridgedNativeWidget* view);
+  ~CocoaDragDropManager();
+
+  void BeginDrag(const ui::OSExchangeData& data,
+                 const gfx::Point& location,
+                 int operation,
+                 ui::DragDropTypes::DragEventSource source);
+
+  NSDragOperation DraggingOver(id<NSDraggingInfo>);
+
+  NSDragOperation OnDrop(id<NSDraggingInfo> sender);
+
+  void EndDrag();
+
+  void SetRootView(View* view);
+
+ private:
+  gfx::Point LocationInView(NSPoint point) const;
+
+  base::scoped_nsobject<CocoaDragSourceProvider> drag_source_;
+  std::unique_ptr<DropHelper> drop_helper_;
+
+  int operation_;
+  BridgedNativeWidget* bridge_;
+
+  DISALLOW_COPY_AND_ASSIGN(CocoaDragDropManager);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_COCOA_COCOA_DRAG_DROP_MANAGER_H_