First round of dead file removal

experimental/visual_studio_plugin/third_party/Microsoft.VisualStudio.Project/ProjectNode.CopyPaste.cs

Index: experimental/visual_studio_plugin/third_party/Microsoft.VisualStudio.Project/ProjectNode.CopyPaste.cs
diff --git a/experimental/visual_studio_plugin/third_party/Microsoft.VisualStudio.Project/ProjectNode.CopyPaste.cs b/experimental/visual_studio_plugin/third_party/Microsoft.VisualStudio.Project/ProjectNode.CopyPaste.cs
deleted file mode 100644
index f7e18342dd5ecf23c7b0ec65bccb314a507f46a2..0000000000000000000000000000000000000000
--- a/experimental/visual_studio_plugin/third_party/Microsoft.VisualStudio.Project/ProjectNode.CopyPaste.cs
+++ /dev/null
@@ -1,1140 +0,0 @@
-/// Copyright (c) Microsoft Corporation.  All rights reserved.
-
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Globalization;
-using System.IO;
-using System.Runtime.InteropServices;
-using System.Security.Permissions;
-using System.Text;
-using Microsoft.VisualStudio;
-using Microsoft.VisualStudio.OLE.Interop;
-using Microsoft.VisualStudio.Shell;
-using Microsoft.VisualStudio.Shell.Interop;
-using IOleDataObject = Microsoft.VisualStudio.OLE.Interop.IDataObject;
-using OleConstants = Microsoft.VisualStudio.OLE.Interop.Constants;
-
-namespace Microsoft.VisualStudio.Project
-{
-	/// <summary>
-	/// Manages the CopyPaste and Drag and Drop scenarios for a Project.
-	/// </summary>
-	/// <remarks>This is a partial class.</remarks>
-	[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Maintainability", "CA1506:AvoidExcessiveClassCoupling")]
-	public partial class ProjectNode : IVsUIHierWinClipboardHelperEvents
-	{
-		#region fields
-		private uint copyPasteCookie;
-		private DropDataType dropDataType;
-		#endregion
-
-		#region override of IVsHierarchyDropDataTarget methods
-		/// <summary>
-		/// Called as soon as the mouse drags an item over a new hierarchy or hierarchy window
-		/// </summary>
-		/// <param name="pDataObject">reference to interface IDataObject of the item being dragged</param>
-		/// <param name="grfKeyState">Current state of the keyboard and the mouse modifier keys. See docs for a list of possible values</param>
-		/// <param name="itemid">Item identifier for the item currently being dragged</param>
-		/// <param name="pdwEffect">On entry, a pointer to the current DropEffect. On return, must contain the new valid DropEffect</param>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code.</returns>
-		public override int DragEnter(IOleDataObject pDataObject, uint grfKeyState, uint itemid, ref uint pdwEffect)
-		{
-			pdwEffect = (uint)DropEffect.None;
-
-			if(this.SourceDraggedOrCutOrCopied)
-			{
-				return VSConstants.S_OK;
-			}
-
-			this.dropDataType = QueryDropDataType(pDataObject);
-			if(this.dropDataType != DropDataType.None)
-			{
-				pdwEffect = (uint)this.QueryDropEffect(this.dropDataType, grfKeyState);
-			}
-
-			return VSConstants.S_OK;
-		}
-
-		/// <summary>
-		/// Called when one or more items are dragged out of the hierarchy or hierarchy window, or when the drag-and-drop operation is cancelled or completed.
-		/// </summary>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code.</returns>
-		public override int DragLeave()
-		{
-			this.dropDataType = DropDataType.None;
-			return VSConstants.S_OK;
-		}
-
-		/// <summary>
-		/// Called when one or more items are dragged over the target hierarchy or hierarchy window. 
-		/// </summary>
-		/// <param name="grfKeyState">Current state of the keyboard keys and the mouse modifier buttons. See <seealso cref="IVsHierarchyDropDataTarget"/></param>
-		/// <param name="itemid">Item identifier of the drop data target over which the item is being dragged</param>
-		/// <param name="pdwEffect"> On entry, reference to the value of the pdwEffect parameter of the IVsHierarchy object, identifying all effects that the hierarchy supports. 
-		/// On return, the pdwEffect parameter must contain one of the effect flags that indicate the result of the drop operation. For a list of pwdEffects values, see <seealso cref="DragEnter"/></param>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code.</returns>
-		public override int DragOver(uint grfKeyState, uint itemid, ref uint pdwEffect)
-		{
-			pdwEffect = (uint)DropEffect.None;
-
-			// Dragging items to a project that is being debugged is not supported
-			// (see VSWhidbey 144785)            
-			DBGMODE dbgMode = VsShellUtilities.GetDebugMode(this.Site) & ~DBGMODE.DBGMODE_EncMask;
-			if(dbgMode == DBGMODE.DBGMODE_Run || dbgMode == DBGMODE.DBGMODE_Break)
-			{
-				return VSConstants.S_OK;
-			}
-
-			if(this.isClosed || this.site == null)
-			{
-				return VSConstants.E_UNEXPECTED;
-			}
-
-			// We should also analyze if the node being dragged over can accept the drop.
-			if(!this.CanTargetNodeAcceptDrop(itemid))
-			{
-				return VSConstants.E_NOTIMPL;
-			}
-
-			if(this.dropDataType != DropDataType.None)
-			{
-				pdwEffect = (uint)this.QueryDropEffect(this.dropDataType, grfKeyState);
-			}
-
-			return VSConstants.S_OK;
-		}
-
-		/// <summary>
-		/// Called when one or more items are dropped into the target hierarchy or hierarchy window when the mouse button is released.
-		/// </summary>
-		/// <param name="pDataObject">Reference to the IDataObject interface on the item being dragged. This data object contains the data being transferred in the drag-and-drop operation. 
-		/// If the drop occurs, then this data object (item) is incorporated into the target hierarchy or hierarchy window.</param>
-		/// <param name="grfKeyState">Current state of the keyboard and the mouse modifier keys. See <seealso cref="IVsHierarchyDropDataTarget"/></param>
-		/// <param name="itemid">Item identifier of the drop data target over which the item is being dragged</param>
-		/// <param name="pdwEffect">Visual effects associated with the drag-and drop-operation, such as a cursor, bitmap, and so on. 
-		/// The value of dwEffects passed to the source object via the OnDropNotify method is the value of pdwEffects returned by the Drop method</param>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code. </returns>
-		public override int Drop(IOleDataObject pDataObject, uint grfKeyState, uint itemid, ref uint pdwEffect)
-		{
-			if(pDataObject == null)
-			{
-				return VSConstants.E_INVALIDARG;
-			}
-
-			pdwEffect = (uint)DropEffect.None;
-
-			// Get the node that is being dragged over and ask it which node should handle this call
-			HierarchyNode targetNode = NodeFromItemId(itemid);
-			if(targetNode != null)
-			{
-				targetNode = targetNode.GetDragTargetHandlerNode();
-			}
-			else
-			{
-				// There is no target node. The drop can not be completed.
-				return VSConstants.S_FALSE;
-			}
-
-			int returnValue;
-			try
-			{
-				DropDataType dropDataType = DropDataType.None;
-				dropDataType = ProcessSelectionDataObject(pDataObject, targetNode);
-				pdwEffect = (uint)this.QueryDropEffect(dropDataType, grfKeyState);
-
-				// If it is a drop from windows and we get any kind of error we return S_FALSE and dropeffect none. This
-				// prevents bogus messages from the shell from being displayed
-				returnValue = (dropDataType != DropDataType.Shell) ? VSConstants.E_FAIL : VSConstants.S_OK;
-			}
-			catch(System.IO.FileNotFoundException e)
-			{
-				Trace.WriteLine("Exception : " + e.Message);
-
-				if(!Utilities.IsInAutomationFunction(this.Site))
-				{
-					string message = e.Message;
-					string title = string.Empty;
-					OLEMSGICON icon = OLEMSGICON.OLEMSGICON_CRITICAL;
-					OLEMSGBUTTON buttons = OLEMSGBUTTON.OLEMSGBUTTON_OK;
-					OLEMSGDEFBUTTON defaultButton = OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST;
-					VsShellUtilities.ShowMessageBox(this.Site, title, message, icon, buttons, defaultButton);
-				}
-
-				returnValue = VSConstants.E_FAIL;
-			}
-
-			return returnValue;
-		}
-		#endregion
-
-		#region override of IVsHierarchyDropDataSource2 methods
-		/// <summary>
-		/// Returns information about one or more of the items being dragged
-		/// </summary>
-		/// <param name="pdwOKEffects">Pointer to a DWORD value describing the effects displayed while the item is being dragged, 
-		/// such as cursor icons that change during the drag-and-drop operation. 
-		/// For example, if the item is dragged over an invalid target point 
-		/// (such as the item's original location), the cursor icon changes to a circle with a line through it. 
-		/// Similarly, if the item is dragged over a valid target point, the cursor icon changes to a file or folder.</param>
-		/// <param name="ppDataObject">Pointer to the IDataObject interface on the item being dragged. 
-		/// This data object contains the data being transferred in the drag-and-drop operation. 
-		/// If the drop occurs, then this data object (item) is incorporated into the target hierarchy or hierarchy window.</param>
-		/// <param name="ppDropSource">Pointer to the IDropSource interface of the item being dragged.</param>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code.</returns>
-		public override int GetDropInfo(out uint pdwOKEffects, out IOleDataObject ppDataObject, out IDropSource ppDropSource)
-		{
-			//init out params
-			pdwOKEffects = (uint)DropEffect.None;
-			ppDataObject = null;
-			ppDropSource = null;
-
-			IOleDataObject dataObject = PackageSelectionDataObject(false);
-			if(dataObject == null)
-			{
-				return VSConstants.E_NOTIMPL;
-			}
-
-			this.SourceDraggedOrCutOrCopied = true;
-
-			pdwOKEffects = (uint)(DropEffect.Move | DropEffect.Copy);
-
-			ppDataObject = dataObject;
-			return VSConstants.S_OK;
-		}
-
-		/// <summary>
-		/// Notifies clients that the dragged item was dropped. 
-		/// </summary>
-		/// <param name="fDropped">If true, then the dragged item was dropped on the target. If false, then the drop did not occur.</param>
-		/// <param name="dwEffects">Visual effects associated with the drag-and-drop operation, such as cursors, bitmaps, and so on. 
-		/// The value of dwEffects passed to the source object via OnDropNotify method is the value of pdwEffects returned by Drop method.</param>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code. </returns>
-		public override int OnDropNotify(int fDropped, uint dwEffects)
-		{
-			if(!this.SourceDraggedOrCutOrCopied)
-			{
-				return VSConstants.S_FALSE;
-			}
-
-			this.CleanupSelectionDataObject(fDropped != 0, false, dwEffects == (uint)DropEffect.Move);
-
-			this.SourceDraggedOrCutOrCopied = false;
-
-			return VSConstants.S_OK;
-		}
-
-		/// <summary>
-		/// Allows the drag source to prompt to save unsaved items being dropped. 
-		/// Notifies the source hierarchy that information dragged from it is about to be dropped on a target. 
-		/// This method is called immediately after the mouse button is released on a drop. 
-		/// </summary>
-		/// <param name="o">Reference to the IDataObject interface on the item being dragged. 
-		/// This data object contains the data being transferred in the drag-and-drop operation. 
-		/// If the drop occurs, then this data object (item) is incorporated into the hierarchy window of the new hierarchy.</param>
-		/// <param name="dwEffect">Current state of the keyboard and the mouse modifier keys.</param>
-		/// <param name="fCancelDrop">If true, then the drop is cancelled by the source hierarchy. If false, then the drop can continue.</param>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code. </returns>
-		public override int OnBeforeDropNotify(IOleDataObject o, uint dwEffect, out int fCancelDrop)
-		{
-			// If there is nothing to be dropped just return that drop should be cancelled.
-			if(this.ItemsDraggedOrCutOrCopied == null)
-			{
-				fCancelDrop = 1;
-				return VSConstants.S_OK;
-			}
-
-			fCancelDrop = 0;
-			bool dirty = false;
-			foreach(HierarchyNode node in this.ItemsDraggedOrCutOrCopied)
-			{
-				bool isDirty, isOpen, isOpenedByUs;
-				uint docCookie;
-				IVsPersistDocData ppIVsPersistDocData;
-				DocumentManager manager = node.GetDocumentManager();
-				if(manager != null)
-				{
-					manager.GetDocInfo(out isOpen, out isDirty, out isOpenedByUs, out docCookie, out ppIVsPersistDocData);
-					if(isDirty && isOpenedByUs)
-					{
-						dirty = true;
-						break;
-					}
-				}
-			}
-
-			// if there are no dirty docs we are ok to proceed
-			if(!dirty)
-			{
-				return VSConstants.S_OK;
-			}
-
-			// Prompt to save if there are dirty docs
-			string message = SR.GetString(SR.SaveModifiedDocuments, CultureInfo.CurrentUICulture);
-			string title = string.Empty;
-			OLEMSGICON icon = OLEMSGICON.OLEMSGICON_WARNING;
-			OLEMSGBUTTON buttons = OLEMSGBUTTON.OLEMSGBUTTON_YESNOCANCEL;
-			OLEMSGDEFBUTTON defaultButton = OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST;
-			int result = VsShellUtilities.ShowMessageBox(Site, title, message, icon, buttons, defaultButton);
-			switch(result)
-			{
-				case NativeMethods.IDYES:
-					break;
-
-				case NativeMethods.IDNO:
-					return VSConstants.S_OK;
-
-				case NativeMethods.IDCANCEL: goto default;
-
-				default:
-					fCancelDrop = 1;
-					return VSConstants.S_OK;
-			}
-
-			// Save all dirty documents
-			foreach(HierarchyNode node in this.ItemsDraggedOrCutOrCopied)
-			{
-				DocumentManager manager = node.GetDocumentManager();
-				if(manager != null)
-				{
-					manager.Save(true);
-				}
-			}
-
-			return VSConstants.S_OK;
-		}
-
-		#endregion
-
-		#region IVsUIHierWinClipboardHelperEvents Members
-		/// <summary>
-		/// Called after your cut/copied items has been pasted
-		/// </summary>
-		///<param name="wasCut">If true, then the IDataObject has been successfully pasted into a target hierarchy. 
-		/// If false, then the cut or copy operation was cancelled.</param>
-		/// <param name="dropEffect">Visual effects associated with the drag and drop operation, such as cursors, bitmaps, and so on. 
-		/// These should be the same visual effects used in OnDropNotify</param>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code. </returns>
-		public virtual int OnPaste(int wasCut, uint dropEffect)
-		{
-			if(!this.SourceDraggedOrCutOrCopied)
-			{
-				return VSConstants.S_FALSE;
-			}
-
-			if(dropEffect == (uint)DropEffect.None)
-			{
-				return OnClear(wasCut);
-			}
-
-			this.CleanupSelectionDataObject(false, wasCut != 0, dropEffect == (uint)DropEffect.Move);
-			this.SourceDraggedOrCutOrCopied = false;
-			return VSConstants.S_OK;
-		}
-
-		/// <summary>
-		/// Called when your cut/copied operation is canceled
-		/// </summary>
-		/// <param name="wasCut">This flag informs the source that the Cut method was called (true), 
-		/// rather than Copy (false), so the source knows whether to "un-cut-highlight" the items that were cut.</param>
-		/// <returns>If the method succeeds, it returns S_OK. If it fails, it returns an error code. </returns>
-		public virtual int OnClear(int wasCut)
-		{
-			if(!this.SourceDraggedOrCutOrCopied)
-			{
-				return VSConstants.S_FALSE;
-			}
-
-			this.CleanupSelectionDataObject(false, wasCut != 0, false, true);
-			this.SourceDraggedOrCutOrCopied = false;
-			return VSConstants.S_OK;
-		}
-		#endregion
-
-		#region virtual methods
-		/// <summary>
-		/// Determines if a node can accept drop opertaion.
-		/// </summary>
-		/// <param name="itemid">The id of the node.</param>
-		/// <returns>true if the node acceots drag operation.</returns>
-		protected internal virtual bool CanTargetNodeAcceptDrop(uint itemId)
-		{
-			HierarchyNode targetNode = NodeFromItemId(itemId);
-			if(targetNode is ReferenceContainerNode || targetNode is ReferenceNode)
-			{
-				return false;
-			}
-			else
-			{
-				return true;
-			}
-		}
-
-		/// <summary>
-		/// Returns a dataobject from selected nodes
-		/// </summary>
-		/// <param name="cutHighlightItems">boolean that defines if the selected items must be cut</param>
-		/// <returns>data object for selected items</returns>
-		internal virtual DataObject PackageSelectionDataObject(bool cutHighlightItems)
-		{
-			this.CleanupSelectionDataObject(false, false, false);
-			StringBuilder sb = new StringBuilder();
-
-			DataObject dataObject = null;
-
-			try
-			{
-				IList<HierarchyNode> selectedNodes = this.GetSelectedNodes();
-				if(selectedNodes != null)
-				{
-					this.InstantiateItemsDraggedOrCutOrCopiedList();
-
-					StringBuilder selectionContent = null;
-
-					// If there is a selection package the data
-					if(selectedNodes.Count > 1)
-					{
-						foreach(HierarchyNode node in selectedNodes)
-						{
-							selectionContent = node.PrepareSelectedNodesForClipBoard();
-							if(selectionContent != null)
-							{
-								sb.Append(selectionContent);
-							}
-						}
-					}
-					else if(selectedNodes.Count == 1)
-					{
-						HierarchyNode selectedNode = selectedNodes[0];
-						selectionContent = selectedNode.PrepareSelectedNodesForClipBoard();
-						if(selectionContent != null)
-						{
-							sb.Append(selectionContent);
-						}
-					}
-				}
-
-				// Add the project items first.
-				IntPtr ptrToItems = this.PackageSelectionData(sb, false);
-				if(ptrToItems == IntPtr.Zero)
-				{
-					return null;
-				}
-
-				FORMATETC fmt = DragDropHelper.CreateFormatEtc(DragDropHelper.CF_VSSTGPROJECTITEMS);
-				dataObject = new DataObject();
-				dataObject.SetData(fmt, ptrToItems);
-
-				// Now add the project path that sourced data. We just write the project file path.
-				IntPtr ptrToProjectPath = this.PackageSelectionData(new StringBuilder(this.GetMkDocument()), true);
-
-				if(ptrToProjectPath != IntPtr.Zero)
-				{
-					dataObject.SetData(DragDropHelper.CreateFormatEtc(DragDropHelper.CF_VSPROJECTCLIPDESCRIPTOR), ptrToProjectPath);
-				}
-
-				if(cutHighlightItems)
-				{
-					bool first = true;
-					IVsUIHierarchyWindow w = UIHierarchyUtilities.GetUIHierarchyWindow(this.site, HierarchyNode.SolutionExplorer);
-
-					foreach(HierarchyNode node in this.ItemsDraggedOrCutOrCopied)
-					{
-						ErrorHandler.ThrowOnFailure(w.ExpandItem((IVsUIHierarchy)this, node.ID, first ? EXPANDFLAGS.EXPF_CutHighlightItem : EXPANDFLAGS.EXPF_AddCutHighlightItem));
-						first = false;
-					}
-				}
-			}
-			catch(COMException e)
-			{
-				Trace.WriteLine("Exception : " + e.Message);
-
-				dataObject = null;
-			}
-
-			return dataObject;
-		}
-
-
-		/// <summary>
-		/// This is used to recursively add a folder from an other project.
-		/// Note that while we copy the folder content completely, we only
-		/// add to the project items which are part of the source project.
-		/// </summary>
-		/// <param name="folderToAdd">Project reference (from data object) using the format: {Guid}|project|folderPath</param>
-		/// <param name="targetNode">Node to add the new folder to</param>
-		protected internal virtual void AddFolderFromOtherProject(string folderToAdd, HierarchyNode targetNode)
-		{
-			if(String.IsNullOrEmpty(folderToAdd))
-				throw new ArgumentNullException("folderToAdd");
-			if(targetNode == null)
-				throw new ArgumentNullException("targetNode");
-
-			// Split the reference in its 3 parts
-			int index1 = Guid.Empty.ToString("B").Length;
-			if(index1 + 1 >= folderToAdd.Length)
-				throw new ArgumentOutOfRangeException("folderToAdd");
-
-			// Get the Guid
-			string guidString = folderToAdd.Substring(1, index1 - 2);
-			Guid projectInstanceGuid = new Guid(guidString);
-
-			// Get the project path
-			int index2 = folderToAdd.IndexOf('|', index1 + 1);
-			if(index2 < 0 || index2 + 1 >= folderToAdd.Length)
-				throw new ArgumentOutOfRangeException("folderToAdd");
-
-			// Finally get the source path
-			string folder = folderToAdd.Substring(index2 + 1);
-
-			// Get the target path
-			string folderName = Path.GetFileName(Path.GetDirectoryName(folder));
-			string targetPath = Path.Combine(GetBaseDirectoryForAddingFiles(targetNode), folderName);
-
-			// Recursively copy the directory to the new location
-			Utilities.RecursivelyCopyDirectory(folder, targetPath);
-
-			// Retrieve the project from which the items are being copied
-			IVsHierarchy sourceHierarchy;
-			IVsSolution solution = (IVsSolution)GetService(typeof(SVsSolution));
-			ErrorHandler.ThrowOnFailure(solution.GetProjectOfGuid(ref projectInstanceGuid, out sourceHierarchy));
-
-			// Then retrieve the item ID of the item to copy
-			uint itemID = VSConstants.VSITEMID_ROOT;
-			ErrorHandler.ThrowOnFailure(sourceHierarchy.ParseCanonicalName(folder, out itemID));
-
-			// Ensure we don't end up in an endless recursion
-			if(Utilities.IsSameComObject(this, sourceHierarchy))
-			{
-				HierarchyNode cursorNode = targetNode;
-				while(cursorNode != null)
-				{
-					if(String.Compare(folder, cursorNode.GetMkDocument(), StringComparison.OrdinalIgnoreCase) == 0)
-						throw new Exception();
-					cursorNode = cursorNode.Parent;
-				}
-			}
-
-			// Now walk the source project hierarchy to see which node needs to be added.
-			WalkSourceProjectAndAdd(sourceHierarchy, itemID, targetNode, false);
-		}
-
-		/// <summary>
-		/// Recursive method that walk a hierarchy and add items it find to our project.
-		/// Note that this is meant as an helper to the Copy&Paste/Drag&Drop functionality.
-		/// </summary>
-		/// <param name="sourceHierarchy">Hierarchy to walk</param>
-		/// <param name="itemId">Item ID where to start walking the hierarchy</param>
-		/// <param name="targetNode">Node to start adding to</param>
-		/// <param name="addSibblings">Typically false on first call and true after that</param>
-		protected virtual void WalkSourceProjectAndAdd(IVsHierarchy sourceHierarchy, uint itemId, HierarchyNode targetNode, bool addSiblings)
-		{
-			// Before we start the walk, add the current node
-			object variant = null;
-			HierarchyNode newNode = targetNode;
-			if(itemId != VSConstants.VSITEMID_NIL)
-			{
-				// Calculate the corresponding path in our project
-				string source;
-				ErrorHandler.ThrowOnFailure(((IVsProject)sourceHierarchy).GetMkDocument(itemId, out source));
-				string name = Path.GetFileName(source.TrimEnd(new char[] { '/', '\\' }));
-				string targetPath = Path.Combine(GetBaseDirectoryForAddingFiles(targetNode), name);
-
-				// See if this is a linked item (file can be linked, not folders)
-				ErrorHandler.ThrowOnFailure(sourceHierarchy.GetProperty(itemId, (int)__VSHPROPID.VSHPROPID_BrowseObject, out variant), VSConstants.E_NOTIMPL);
-				VSLangProj.FileProperties fileProperties = variant as VSLangProj.FileProperties;
-				if(fileProperties != null && fileProperties.IsLink)
-				{
-					// Since we don't support linked item, we make a copy of the file into our storage where it would have been linked
-					File.Copy(source, targetPath, true);
-				}
-
-				newNode = AddNodeIfTargetExistInStorage(targetNode, name, targetPath);
-
-
-				// Start with child nodes (depth first)
-				variant = null;
-				ErrorHandler.ThrowOnFailure(sourceHierarchy.GetProperty(itemId, (int)__VSHPROPID.VSHPROPID_FirstVisibleChild, out variant));
-				uint currentItemID = (uint)(int)variant;
-				WalkSourceProjectAndAdd(sourceHierarchy, currentItemID, newNode, true);
-
-				if(addSiblings)
-				{
-					// Then look at siblings
-					currentItemID = itemId;
-					while(currentItemID != VSConstants.VSITEMID_NIL)
-					{
-						variant = null;
-						ErrorHandler.ThrowOnFailure(sourceHierarchy.GetProperty(itemId, (int)__VSHPROPID.VSHPROPID_NextVisibleSibling, out variant));
-						currentItemID = (uint)(int)variant;
-						WalkSourceProjectAndAdd(sourceHierarchy, currentItemID, targetNode, true);
-					}
-				}
-			}
-		}
-
-		/// <summary>
-		/// Add an existing item (file/folder) to the project if it already exist in our storage.
-		/// </summary>
-		/// <param name="parentNode">Node to that this item to</param>
-		/// <param name="name">Name of the item being added</param>
-		/// <param name="targetPath">Path of the item being added</param>
-		/// <returns>Node that was added</returns>
-		protected virtual HierarchyNode AddNodeIfTargetExistInStorage(HierarchyNode parentNode, string name, string targetPath)
-		{
-			HierarchyNode newNode = parentNode;
-			// If the file/directory exist, add a node for it
-			if(File.Exists(targetPath))
-			{
-				VSADDRESULT[] result = new VSADDRESULT[1];
-				ErrorHandler.ThrowOnFailure(this.AddItem(parentNode.ID, VSADDITEMOPERATION.VSADDITEMOP_OPENFILE, name, 1, new string[] { targetPath }, IntPtr.Zero, result));
-				if(result[0] != VSADDRESULT.ADDRESULT_Success)
-					throw new Exception();
-				newNode = this.FindChild(targetPath);
-				if(newNode == null)
-					throw new Exception();
-			}
-			else if(Directory.Exists(targetPath))
-			{
-				newNode = this.CreateFolderNodes(targetPath);
-			}
-			return newNode;
-		}
-		#endregion
-
-		#region non-virtual methods
-		/// <summary>
-		/// Handle the Cut operation to the clipboard
-		/// </summary>
-		protected internal override int CutToClipboard()
-		{
-			int returnValue = (int)OleConstants.OLECMDERR_E_NOTSUPPORTED;
-			try
-			{
-				this.RegisterClipboardNotifications(true);
-
-				// Create our data object and change the selection to show item(s) being cut
-				IOleDataObject dataObject = this.PackageSelectionDataObject(true);
-				if(dataObject != null)
-				{
-					this.SourceDraggedOrCutOrCopied = true;
-
-					// Add our cut item(s) to the clipboard
-					ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleSetClipboard(dataObject));
-
-					// Inform VS (UiHierarchyWindow) of the cut
-					IVsUIHierWinClipboardHelper clipboardHelper = (IVsUIHierWinClipboardHelper)GetService(typeof(SVsUIHierWinClipboardHelper));
-					if(clipboardHelper == null)
-					{
-						return VSConstants.E_FAIL;
-					}
-
-					returnValue = ErrorHandler.ThrowOnFailure(clipboardHelper.Cut(dataObject));
-				}
-			}
-			catch(COMException e)
-			{
-				Trace.WriteLine("Exception : " + e.Message);
-				returnValue = e.ErrorCode;
-			}
-
-			return returnValue;
-		}
-
-		/// <summary>
-		/// Handle the Copy operation to the clipboard
-		/// </summary>
-		protected internal override int CopyToClipboard()
-		{
-			int returnValue = (int)OleConstants.OLECMDERR_E_NOTSUPPORTED;
-			try
-			{
-				this.RegisterClipboardNotifications(true);
-
-				// Create our data object and change the selection to show item(s) being copy
-				IOleDataObject dataObject = this.PackageSelectionDataObject(false);
-				if(dataObject != null)
-				{
-					this.SourceDraggedOrCutOrCopied = true;
-
-					// Add our copy item(s) to the clipboard
-					ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleSetClipboard(dataObject));
-
-					// Inform VS (UiHierarchyWindow) of the copy
-					IVsUIHierWinClipboardHelper clipboardHelper = (IVsUIHierWinClipboardHelper)GetService(typeof(SVsUIHierWinClipboardHelper));
-					if(clipboardHelper == null)
-					{
-						return VSConstants.E_FAIL;
-					}
-					returnValue = ErrorHandler.ThrowOnFailure(clipboardHelper.Copy(dataObject));
-				}
-			}
-			catch(COMException e)
-			{
-				Trace.WriteLine("Exception : " + e.Message);
-				returnValue = e.ErrorCode;
-			}
-			catch(ArgumentException e)
-			{
-				Trace.WriteLine("Exception : " + e.Message);
-				returnValue = Marshal.GetHRForException(e);
-			}
-
-			return returnValue;
-		}
-
-		/// <summary>
-		/// Handle the Paste operation to a targetNode
-		/// </summary>
-		protected internal override int PasteFromClipboard(HierarchyNode targetNode)
-		{
-			int returnValue = (int)OleConstants.OLECMDERR_E_NOTSUPPORTED;
-
-			//Get the clipboardhelper service and use it after processing dataobject
-			IVsUIHierWinClipboardHelper clipboardHelper = (IVsUIHierWinClipboardHelper)GetService(typeof(SVsUIHierWinClipboardHelper));
-			if(clipboardHelper == null)
-			{
-				return VSConstants.E_FAIL;
-			}
-
-			try
-			{
-				//Get dataobject from clipboard
-				IOleDataObject dataObject = null;
-				ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleGetClipboard(out dataObject));
-				if(dataObject == null)
-				{
-					return VSConstants.E_UNEXPECTED;
-				}
-
-				DropEffect dropEffect = DropEffect.None;
-				DropDataType dropDataType = DropDataType.None;
-				try
-				{
-					dropDataType = this.ProcessSelectionDataObject(dataObject, targetNode.GetDragTargetHandlerNode());
-					dropEffect = this.QueryDropEffect(dropDataType, 0);
-				}
-				catch(ExternalException e)
-				{
-					Trace.WriteLine("Exception : " + e.Message);
-
-					// If it is a drop from windows and we get any kind of error ignore it. This
-					// prevents bogus messages from the shell from being displayed
-					if(dropDataType != DropDataType.Shell)
-					{
-						throw;
-					}
-				}
-				finally
-				{
-					// Inform VS (UiHierarchyWindow) of the paste
-					returnValue = clipboardHelper.Paste(dataObject, (uint)dropEffect);
-				}
-			}
-			catch(COMException e)
-			{
-				Trace.WriteLine("Exception : " + e.Message);
-
-				returnValue = e.ErrorCode;
-			}
-
-			return returnValue;
-		}
-
-		/// <summary>
-		/// Determines if the paste command should be allowed.
-		/// </summary>
-		/// <returns></returns>
-		protected internal override bool AllowPasteCommand()
-		{
-			IOleDataObject dataObject = null;
-			try
-			{
-				ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleGetClipboard(out dataObject));
-				if(dataObject == null)
-				{
-					return false;
-				}
-
-				// First see if this is a set of storage based items
-				FORMATETC format = DragDropHelper.CreateFormatEtc((ushort)DragDropHelper.CF_VSSTGPROJECTITEMS);
-				if(dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK)
-					return true;
-				// Try reference based items
-				format = DragDropHelper.CreateFormatEtc((ushort)DragDropHelper.CF_VSREFPROJECTITEMS);
-				if(dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK)
-					return true;
-				// Try windows explorer files format
-				format = DragDropHelper.CreateFormatEtc((ushort)NativeMethods.CF_HDROP);
-				return (dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK);
-			}
-			// We catch External exceptions since it might be that it is not our data on the clipboard.
-			catch(ExternalException e)
-			{
-				Trace.WriteLine("Exception :" + e.Message);
-				return false;
-			}
-		}
-
-		/// <summary>
-		/// Register/Unregister for Clipboard events for the UiHierarchyWindow (solution explorer)
-		/// </summary>
-		/// <param name="register">true for register, false for unregister</param>
-		protected internal override void RegisterClipboardNotifications(bool register)
-		{
-			// Get the UiHierarchy window clipboard helper service
-			IVsUIHierWinClipboardHelper clipboardHelper = (IVsUIHierWinClipboardHelper)GetService(typeof(SVsUIHierWinClipboardHelper));
-			if(clipboardHelper == null)
-			{
-				return;
-			}
-
-			if(register && this.copyPasteCookie == 0)
-			{
-				// Register
-				ErrorHandler.ThrowOnFailure(clipboardHelper.AdviseClipboardHelperEvents(this, out this.copyPasteCookie));
-				Debug.Assert(this.copyPasteCookie != 0, "AdviseClipboardHelperEvents returned an invalid cookie");
-			}
-			else if(!register && this.copyPasteCookie != 0)
-			{
-				// Unregister
-				ErrorHandler.ThrowOnFailure(clipboardHelper.UnadviseClipboardHelperEvents(this.copyPasteCookie));
-				this.copyPasteCookie = 0;
-			}
-		}
-
-		/// <summary>
-		/// Process dataobject from Drag/Drop/Cut/Copy/Paste operation
-		/// </summary>
-		/// <remarks>The targetNode is set if the method is called from a drop operation, otherwise it is null</remarks>
-		internal DropDataType ProcessSelectionDataObject(IOleDataObject dataObject, HierarchyNode targetNode)
-		{
-			DropDataType dropDataType = DropDataType.None;
-			bool isWindowsFormat = false;
-
-			// Try to get it as a directory based project.
-			List<string> filesDropped = DragDropHelper.GetDroppedFiles(DragDropHelper.CF_VSSTGPROJECTITEMS, dataObject, out dropDataType);
-			if(filesDropped.Count == 0)
-			{
-				filesDropped = DragDropHelper.GetDroppedFiles(DragDropHelper.CF_VSREFPROJECTITEMS, dataObject, out dropDataType);
-			}
-			if(filesDropped.Count == 0)
-			{
-				filesDropped = DragDropHelper.GetDroppedFiles(NativeMethods.CF_HDROP, dataObject, out dropDataType);
-				isWindowsFormat = (filesDropped.Count > 0);
-			}
-
-			if(dropDataType != DropDataType.None && filesDropped.Count > 0)
-			{
-				string[] filesDroppedAsArray = filesDropped.ToArray();
-
-				HierarchyNode node = (targetNode == null) ? this : targetNode;
-
-				// For directory based projects the content of the clipboard is a double-NULL terminated list of Projref strings.
-				if(isWindowsFormat)
-				{
-					// This is the code path when source is windows explorer
-					VSADDRESULT[] vsaddresults = new VSADDRESULT[1];
-					vsaddresults[0] = VSADDRESULT.ADDRESULT_Failure;
-					int addResult = AddItem(node.ID, VSADDITEMOPERATION.VSADDITEMOP_OPENFILE, null, (uint)filesDropped.Count, filesDroppedAsArray, IntPtr.Zero, vsaddresults);
-					if(addResult != VSConstants.S_OK && addResult != VSConstants.S_FALSE && addResult != (int)OleConstants.OLECMDERR_E_CANCELED
-						&& vsaddresults[0] != VSADDRESULT.ADDRESULT_Success)
-					{
-						ErrorHandler.ThrowOnFailure(addResult);
-					}
-
-					return dropDataType;
-				}
-				else
-				{
-					if(AddFilesFromProjectReferences(node, filesDroppedAsArray))
-					{
-						return dropDataType;
-					}
-				}
-			}
-
-			// If we reached this point then the drop data must be set to None.
-			// Otherwise the OnPaste will be called with a valid DropData and that would actually delete the item.
-			return DropDataType.None;
-		}
-
-		/// <summary>
-		/// Get the dropdatatype from the dataobject
-		/// </summary>
-		/// <param name="pDataObject">The dataobject to be analysed for its format</param>
-		/// <returns>dropdatatype or none if dataobject does not contain known format</returns>
-		internal static DropDataType QueryDropDataType(IOleDataObject pDataObject)
-		{
-			if(pDataObject == null)
-			{
-				return DropDataType.None;
-			}
-
-			// known formats include File Drops (as from WindowsExplorer),
-			// VSProject Reference Items and VSProject Storage Items.
-			FORMATETC fmt = DragDropHelper.CreateFormatEtc(NativeMethods.CF_HDROP);
-
-			if(DragDropHelper.QueryGetData(pDataObject, ref fmt) == VSConstants.S_OK)
-			{
-				return DropDataType.Shell;
-			}
-
-			fmt.cfFormat = DragDropHelper.CF_VSREFPROJECTITEMS;
-			if(DragDropHelper.QueryGetData(pDataObject, ref fmt) == VSConstants.S_OK)
-			{
-				// Data is from a Ref-based project.
-				return DropDataType.VsRef;
-			}
-
-			fmt.cfFormat = DragDropHelper.CF_VSSTGPROJECTITEMS;
-			if(DragDropHelper.QueryGetData(pDataObject, ref fmt) == VSConstants.S_OK)
-			{
-				return DropDataType.VsStg;
-			}
-
-			return DropDataType.None;
-		}
-
-		/// <summary>
-		/// Returns the drop effect.
-		/// </summary>
-		/// <remarks>
-		/// // A directory based project should perform as follow:
-		///		NO MODIFIER 
-		///			- COPY if not from current hierarchy, 
-		///			- MOVE if from current hierarchy
-		///		SHIFT DRAG - MOVE
-		///		CTRL DRAG - COPY
-		///		CTRL-SHIFT DRAG - NO DROP (used for reference based projects only)
-		/// </remarks>
-		internal DropEffect QueryDropEffect(DropDataType dropDataType, uint grfKeyState)
-		{
-			//Validate the dropdatatype
-			if((dropDataType != DropDataType.Shell) && (dropDataType != DropDataType.VsRef) && (dropDataType != DropDataType.VsStg))
-			{
-				return DropEffect.None;
-			}
-
-			// CTRL-SHIFT
-			if((grfKeyState & NativeMethods.MK_CONTROL) != 0 && (grfKeyState & NativeMethods.MK_SHIFT) != 0)
-			{
-				// Because we are not referenced base, we don't support link
-				return DropEffect.None;
-			}
-
-			// CTRL
-			if((grfKeyState & NativeMethods.MK_CONTROL) != 0)
-				return DropEffect.Copy;
-
-			// SHIFT
-			if((grfKeyState & NativeMethods.MK_SHIFT) != 0)
-				return DropEffect.Move;
-
-			// no modifier
-			if(this.SourceDraggedOrCutOrCopied)
-			{
-				return DropEffect.Move;
-			}
-			else
-			{
-				return DropEffect.Copy;
-			}
-		}
-
-		internal void CleanupSelectionDataObject(bool dropped, bool cut, bool moved)
-		{
-			this.CleanupSelectionDataObject(dropped, cut, moved, false);
-		}
-
-		/// <summary>
-		///  After a drop or paste, will use the dwEffects 
-		///  to determine whether we need to clean up the source nodes or not. If
-		///  justCleanup is set, it only does the cleanup work.
-		/// </summary>
-		internal void CleanupSelectionDataObject(bool dropped, bool cut, bool moved, bool justCleanup)
-		{
-			if(this.ItemsDraggedOrCutOrCopied == null || this.ItemsDraggedOrCutOrCopied.Count == 0)
-			{
-				return;
-			}
-
-			try
-			{
-				IVsUIHierarchyWindow w = UIHierarchyUtilities.GetUIHierarchyWindow(this.site, HierarchyNode.SolutionExplorer);
-				foreach(HierarchyNode node in this.ItemsDraggedOrCutOrCopied)
-				{
-					if((moved && (cut || dropped) && !justCleanup))
-					{
-						// do not close it if the doc is dirty or we do not own it
-						bool isDirty, isOpen, isOpenedByUs;
-						uint docCookie;
-						IVsPersistDocData ppIVsPersistDocData;
-						DocumentManager manager = node.GetDocumentManager();
-						if(manager != null)
-						{
-							manager.GetDocInfo(out isOpen, out isDirty, out isOpenedByUs, out docCookie, out ppIVsPersistDocData);
-							if(isDirty || (isOpen && !isOpenedByUs))
-							{
-								continue;
-							}
-
-							// close it if opened
-							if(isOpen)
-							{
-								manager.Close(__FRAMECLOSE.FRAMECLOSE_NoSave);
-							}
-						}
-
-						node.Remove(true);
-					}
-					else if(w != null)
-					{
-						ErrorHandler.ThrowOnFailure(w.ExpandItem((IVsUIHierarchy)this, node.ID, EXPANDFLAGS.EXPF_UnCutHighlightItem));
-					}
-				}
-			}
-			finally
-			{
-				try
-				{
-					// Now delete the memory allocated by the packaging of datasources.
-					// If we just did a cut, or we are told to cleanup, then we need to free the data object. Otherwise, we leave it
-					// alone so that you can continue to paste the data in new locations.
-					if(moved || cut || justCleanup)
-					{
-						this.ItemsDraggedOrCutOrCopied.Clear();
-						this.CleanAndFlushClipboard();
-					}
-				}
-				finally
-				{
-					this.dropDataType = DropDataType.None;
-				}
-			}
-		}
-
-		/// <summary>
-		/// Moves files from one part of our project to another.
-		/// </summary>
-		/// <param name="targetNode">the targetHandler node</param>
-		/// <param name="projectReferences">List of projectref string</param>
-		/// <returns>true if succeeded</returns>
-		internal bool AddFilesFromProjectReferences(HierarchyNode targetNode, string[] projectReferences)
-		{
-			//Validate input
-			if(projectReferences == null)
-			{
-				throw new ArgumentException(SR.GetString(SR.InvalidParameter, CultureInfo.CurrentUICulture), "projectReferences");
-			}
-			if(targetNode == null)
-			{
-				throw new InvalidOperationException();
-			}
-
-			//Iteratively add files from projectref
-			foreach(string projectReference in projectReferences)
-			{
-				if(projectReference == null)
-				{
-					// bad projectref, bail out
-					return false;
-				}
-				if(projectReference.EndsWith("/", StringComparison.Ordinal) || projectReference.EndsWith("\\", StringComparison.Ordinal))
-				{
-					AddFolderFromOtherProject(projectReference, targetNode);
-				}
-				else if(!AddFileToNodeFromProjectReference(projectReference, targetNode))
-				{
-					return false;
-				}
-			}
-
-			return true;
-		}
-
-		#endregion
-
-		#region private helper methods
-		/// <summary>
-		/// Empties all the data structures added to the clipboard and flushes the clipboard.
-		/// </summary>
-		private void CleanAndFlushClipboard()
-		{
-			IOleDataObject oleDataObject = null;
-			ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleGetClipboard(out oleDataObject));
-			if(oleDataObject == null)
-			{
-				return;
-			}
-
-
-			string sourceProjectPath = DragDropHelper.GetSourceProjectPath(oleDataObject);
-
-			if(!String.IsNullOrEmpty(sourceProjectPath) && NativeMethods.IsSamePath(sourceProjectPath, this.GetMkDocument()))
-			{
-				ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleFlushClipboard());
-				int clipboardOpened = 0;
-				try
-				{
-					ErrorHandler.ThrowOnFailure(clipboardOpened = UnsafeNativeMethods.OpenClipboard(IntPtr.Zero));
-					ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.EmptyClipboard());
-				}
-				finally
-				{
-					if(clipboardOpened == 1)
-					{
-						ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.CloseClipboard());
-					}
-				}
-			}
-		}
-
-		private IntPtr PackageSelectionData(StringBuilder sb, bool addEndFormatDelimiter)
-		{
-			if(sb == null || sb.ToString().Length == 0 || this.ItemsDraggedOrCutOrCopied.Count == 0)
-			{
-				return IntPtr.Zero;
-			}
-
-			// Double null at end.
-			if(addEndFormatDelimiter)
-			{
-				if(sb.ToString()[sb.Length - 1] != '\0')
-				{
-					sb.Append('\0');
-				}
-			}
-
-			// We request unmanaged permission to execute the below.
-			new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();
-
-			_DROPFILES df = new _DROPFILES();
-			int dwSize = Marshal.SizeOf(df);
-			Int16 wideChar = 0;
-			int dwChar = Marshal.SizeOf(wideChar);
-			int structSize = dwSize + ((sb.Length + 1) * dwChar);
-			IntPtr ptr = Marshal.AllocHGlobal(structSize);
-			df.pFiles = dwSize;
-			df.fWide = 1;
-			IntPtr data = IntPtr.Zero;
-			try
-			{
-				data = UnsafeNativeMethods.GlobalLock(ptr);
-				Marshal.StructureToPtr(df, data, false);
-				IntPtr strData = new IntPtr((long)data + dwSize);
-				DragDropHelper.CopyStringToHGlobal(sb.ToString(), strData, structSize);
-			}
-			finally
-			{
-				if(data != IntPtr.Zero)
-					UnsafeNativeMethods.GlobalUnLock(data);
-			}
-
-			return ptr;
-		}
-
-		#endregion
-	}
-}