Support Drag and Drop across displays.

ash/drag_drop/drag_drop_controller.h

 // Copyright (c) 2012 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 ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 #define ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "base/callback.h"
 #include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/event_filter.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/events.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/gfx/point.h"
 
 namespace aura {
+class RootWindow;
 class Window;
 }
 
 namespace ui {
 class LayerAnimationSequence;
 }
 
 namespace ash {
 
 namespace test {
 class DragDropControllerTest;
 }
 
 namespace internal {
 
+class DragDropTracker;
 class DragImageView;
 
 class ASH_EXPORT DragDropController
     : public aura::client::DragDropClient,
       public aura::EventFilter,
       public ui::ImplicitAnimationObserver,
       public aura::WindowObserver {
  public:
   DragDropController();
   virtual ~DragDropController();
 
   void set_should_block_during_drag_drop(bool should_block_during_drag_drop) {
     should_block_during_drag_drop_ = should_block_during_drag_drop;
   }
 
   // Overridden from aura::client::DragDropClient:
   virtual int StartDragAndDrop(const ui::OSExchangeData& data,
+                               aura::RootWindow* root_window,
                                const gfx::Point& root_location,
                                int operation) OVERRIDE;
   virtual void DragUpdate(aura::Window* target,
                           const ui::LocatedEvent& event) OVERRIDE;
   virtual void Drop(aura::Window* target,
                     const ui::LocatedEvent& event) OVERRIDE;
   virtual void DragCancel() OVERRIDE;
   virtual bool IsDragDropInProgress() OVERRIDE;
   virtual gfx::NativeCursor GetDragCursor() OVERRIDE;
 
@@ skipping 27 matching lines @@
   scoped_ptr<DragImageView> drag_image_;
   gfx::Point drag_image_offset_;
   const ui::OSExchangeData* drag_data_;
   int drag_operation_;
   gfx::NativeCursor drag_cursor_;
 
   // Window that is currently under the drag cursor.
   aura::Window* drag_window_;
   gfx::Point drag_start_location_;
 
-  bool drag_drop_in_progress_;
-
   // Indicates whether the caller should be blocked on a drag/drop session.
   // Only be used for tests.
   bool should_block_during_drag_drop_;
 
   // Closure for quitting nested message loop.
   base::Closure quit_closure_;
 
+  scoped_ptr<ash::internal::DragDropTracker> drag_drop_tracker_;
+
   DISALLOW_COPY_AND_ASSIGN(DragDropController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_