First shot at implementing drag&drop for Aura

views/widget/native_widget_aura.h

 // Copyright (c) 2011 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 VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 #define VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 #pragma once
 
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/window_delegate.h"
+#include "ui/aura/window_drag_drop_delegate.h"
 #include "ui/base/events.h"
 #include "views/views_export.h"
 #include "views/widget/native_widget_private.h"
 
 namespace aura {
 class Window;
 }
 namespace gfx {
 class Font;
 }
 
 namespace views {
 
+class DropHelper;
 class TooltipManagerViews;
 
 class VIEWS_EXPORT NativeWidgetAura : public internal::NativeWidgetPrivate,
-                                      public aura::WindowDelegate {
+                                      public aura::WindowDelegate,
+                                      public aura::WindowDragDropDelegate {
  public:
   explicit NativeWidgetAura(internal::NativeWidgetDelegate* delegate);
   virtual ~NativeWidgetAura();
 
   // TODO(beng): Find a better place for this, and the similar method on
   //             NativeWidgetWin.
   static gfx::Font GetWindowTitleFont();
 
   // Overridden from internal::NativeWidgetPrivate:
   virtual void InitNativeWidget(const Widget::InitParams& params) OVERRIDE;
@@ skipping 93 matching lines @@
   virtual ui::TouchStatus OnTouchEvent(aura::TouchEvent* event) OVERRIDE;
   virtual bool ShouldActivate(aura::Event* event) OVERRIDE;
   virtual void OnActivated() OVERRIDE;
   virtual void OnLostActive() OVERRIDE;
   virtual void OnCaptureLost() OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void OnWindowDestroying() OVERRIDE;
   virtual void OnWindowDestroyed() OVERRIDE;
   virtual void OnWindowVisibilityChanged(bool visible) OVERRIDE;
 
+  // Overridden from aura::WindowDragDropDelegate:
+  virtual bool CanDrop(const aura::DropTargetEvent& event) OVERRIDE;
+  virtual void OnDragEntered(const aura::DropTargetEvent& event) OVERRIDE;
+  virtual int OnDragUpdated(const aura::DropTargetEvent& event) OVERRIDE;
+  virtual void OnDragExited() OVERRIDE;
+  virtual int OnPerformDrop(const aura::DropTargetEvent& event) OVERRIDE;
+
  private:
   class DesktopObserverImpl;
 
   internal::NativeWidgetDelegate* delegate_;
 
   aura::Window* window_;
 
   // See class documentation for Widget in widget.h for a note about ownership.
   Widget::InitParams::Ownership ownership_;
 
   // The following factory is used for calls to close the NativeWidgetAura
   // instance.
   base::WeakPtrFactory<NativeWidgetAura> close_widget_factory_;
 
   // Can we be made active?
   bool can_activate_;
 
   gfx::NativeCursor cursor_;
 
   scoped_ptr<TooltipManagerViews> tooltip_manager_;
 
   scoped_ptr<DesktopObserverImpl> desktop_observer_;
 
+  scoped_ptr<DropHelper> drop_helper_;
+
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_