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diff --git a/vcl/osx/DragSource.hxx b/vcl/osx/DragSource.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_OSX_DRAGSOURCE_HXX
+#define INCLUDED_VCL_OSX_DRAGSOURCE_HXX
+
+#include <com/sun/star/datatransfer/dnd/XDragSource.hpp>
+#include <com/sun/star/datatransfer/dnd/XDragSourceContext.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <cppuhelper/compbase.hxx>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <cppuhelper/basemutex.hxx>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <osl/thread.h>
+#include <com/sun/star/awt/MouseEvent.hpp>
+
+#include <premac.h>
+#import <Cocoa/Cocoa.h>
+#include <postmac.h>
+
+class DragSource;
+class AquaSalFrame;
+
+/* The functions declared in this protocol are actually
+   declared in vcl/inc/osx/salframe.h. Because we want
+   to avoid importing VCL headers in UNO services and
+   on the other hand want to avoid warnings caused by
+   gcc complaining about unknowness of these functions
+   we declare them in a protocol here and cast at the
+   appropriate places.
+*/
+@protocol MouseEventListener
+-(void)registerMouseEventListener:(id)theHandler;
+-(void)unregisterMouseEventListener:(id)theHandler;
+@end
+
+@interface DragSourceHelper : NSObject
+{
+  DragSource* mDragSource;
+}
+
+-(DragSourceHelper*)initWithDragSource: (DragSource*) pds;
+
+-(void)mouseDown: (NSEvent*)theEvent;
+-(void)mouseDragged: (NSEvent*)theEvent;
+
+-(unsigned int)draggingSourceOperationMaskForLocal:(BOOL)isLocal;
+-(void)draggedImage:(NSImage*)anImage beganAt:(NSPoint)aPoint;
+-(void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation;
+-(void)draggedImage:(NSImage *)draggedImage movedTo:(NSPoint)screenPoint;
+
+@end
+
+class DragSource : public ::cppu::BaseMutex,
+                   public ::cppu::WeakComponentImplHelper< css::datatransfer::dnd::XDragSource,
+                                                            css::lang::XInitialization,
+                                                            css::lang::XServiceInfo >
+{
+public:
+  DragSource();
+  virtual ~DragSource() override;
+  DragSource(const DragSource&) = delete;
+  DragSource& operator=(const DragSource&) = delete;
+
+  // XInitialization
+  virtual void SAL_CALL initialize( const css::uno::Sequence< css::uno::Any >& aArguments ) override;
+
+  // XDragSource
+  virtual sal_Bool SAL_CALL isDragImageSupported(  ) override;
+
+  virtual sal_Int32 SAL_CALL getDefaultCursor(sal_Int8 dragAction) override;
+
+  virtual void SAL_CALL startDrag( const css::datatransfer::dnd::DragGestureEvent& trigger,
+                                   sal_Int8 sourceActions,
+                                   sal_Int32 cursor,
+                                   sal_Int32 image,
+                                   const css::uno::Reference< css::datatransfer::XTransferable >& transferable,
+                                   const css::uno::Reference< css::datatransfer::dnd::XDragSourceListener >& listener ) override;
+
+  // XServiceInfo
+  virtual OUString SAL_CALL getImplementationName() override;
+  virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
+  virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+  void saveMouseEvent(NSEvent* theEvent);
+  unsigned int getSupportedDragOperations(bool isLocal) const;
+
+public:
+  // The context notifies the XDragSourceListeners
+  css::uno::Reference< css::datatransfer::dnd::XDragSourceContext > mXCurrentContext;
+
+  id mView;
+  AquaSalFrame* mpFrame;
+  NSEvent* mLastMouseEventBeforeStartDrag;
+  DragSourceHelper* mDragSourceHelper;
+  css::awt::MouseEvent mMouseEvent;
+  css::uno::Reference< css::datatransfer::XTransferable > mXTransferable;
+  css::uno::Reference< css::datatransfer::dnd::XDragSourceListener > mXDragSrcListener;
+  // The mouse button that set off the drag and drop operation
+  short m_MouseButton;
+  sal_Int8 mDragSourceActions;
+
+  static css::uno::Reference< css::datatransfer::XTransferable > g_XTransferable;
+  static NSView* g_DragSourceView;
+  static bool    g_DropSuccessSet;
+  static bool    g_DropSuccess;
+
+};
+
+#endif // INCLUDED_VCL_OSX_DRAGSOURCE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */