Proof out the changes necessary for making SharpTreeNode cross platform by proxying System.Windows dependencies

ILSpy/Analyzers/AnalyzerEntityTreeNode.cs

@@ -23,6 +23,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.ILSpy.TreeNodes;
 using ICSharpCode.ILSpyX;
 using ICSharpCode.TreeView;
+using ICSharpCode.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.ILSpy.Analyzers
 {
@@ -33,7 +34,7 @@ namespace ICSharpCode.ILSpy.Analyzers
 	{
 		public abstract IEntity Member { get; }
 
-		public override void ActivateItem(System.Windows.RoutedEventArgs e)
+		public override void ActivateItem(IPlatformRoutedEventArgs e)
 		{
 			e.Handled = true;
 			if (this.Member == null || this.Member.MetadataToken.IsNil)

ILSpy/Analyzers/TreeNodes/AnalyzedModuleTreeNode.cs

@@ -22,6 +22,7 @@ using System.Windows;
 
 using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.ILSpyX.Analyzers;
+using ICSharpCode.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.ILSpy.Analyzers.TreeNodes
 {
@@ -52,7 +53,7 @@ namespace ICSharpCode.ILSpy.Analyzers.TreeNodes
 			}
 		}
 
-		public override void ActivateItem(RoutedEventArgs e)
+		public override void ActivateItem(IPlatformRoutedEventArgs e)
 		{
 			e.Handled = true;
 			if (analyzedModule.MetadataFile == null)

ILSpy/TreeNodes/AssemblyListTreeNode.cs

@@ -27,6 +27,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.Decompiler.Util;
 using ICSharpCode.ILSpyX;
 using ICSharpCode.TreeView;
+using ICSharpCode.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.ILSpy.TreeNodes
 {
@@ -81,21 +82,21 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			};
 		}
 
-		public override bool CanDrop(DragEventArgs e, int index)
+		public override bool CanDrop(IPlatformDragEventArgs e, int index)
 		{
-			e.Effects = DragDropEffects.Move | DragDropEffects.Copy | DragDropEffects.Link;
+			e.Effects = XPlatDragDropEffects.Move | XPlatDragDropEffects.Copy | XPlatDragDropEffects.Link;
 			if (e.Data.GetDataPresent(AssemblyTreeNode.DataFormat))
 				return true;
 			else if (e.Data.GetDataPresent(DataFormats.FileDrop))
 				return true;
 			else
 			{
-				e.Effects = DragDropEffects.None;
+				e.Effects = XPlatDragDropEffects.None;
 				return false;
 			}
 		}
 
-		public override void Drop(DragEventArgs e, int index)
+		public override void Drop(IPlatformDragEventArgs e, int index)
 		{
 			string[] files = e.Data.GetData(AssemblyTreeNode.DataFormat) as string[];
 			if (files == null)

ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs

@@ -22,6 +22,7 @@ using System.Windows.Threading;
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.Decompiler.TypeSystem;
+using ICSharpCode.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.ILSpy.TreeNodes
 {
@@ -66,7 +67,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			}
 		}
 
-		public override void ActivateItem(System.Windows.RoutedEventArgs e)
+		public override void ActivateItem(IPlatformRoutedEventArgs e)
 		{
 			if (parentAssembly.Parent is AssemblyListTreeNode assemblyListNode)
 			{

ILSpy/TreeNodes/AssemblyTreeNode.cs

@@ -36,6 +36,8 @@ using ICSharpCode.ILSpyX;
 using ICSharpCode.ILSpyX.FileLoaders;
 using ICSharpCode.ILSpyX.PdbProvider;
 using ICSharpCode.TreeView;
+using ICSharpCode.TreeView.PlatformAbstractions;
+using ICSharpCode.TreeView.PlatformAbstractions.WpfWindows;
 
 using Microsoft.Win32;
 
@@ -410,9 +412,9 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			return nodes.All(n => n is AssemblyTreeNode { PackageEntry: null });
 		}
 
-		public override void StartDrag(DependencyObject dragSource, SharpTreeNode[] nodes)
+		public override void StartDrag(object dragSource, SharpTreeNode[] nodes, IPlatformDragDrop dragdropManager)
 		{
-			DragDrop.DoDragDrop(dragSource, Copy(nodes), DragDropEffects.All);
+			dragdropManager.DoDragDrop(dragSource, Copy(nodes), XPlatDragDropEffects.All);
 		}
 
 		public override bool CanDelete()
@@ -433,9 +435,9 @@ namespace ICSharpCode.ILSpy.TreeNodes
 
 		internal const string DataFormat = "ILSpyAssemblies";
 
-		public override IDataObject Copy(SharpTreeNode[] nodes)
+		public override IPlatformDataObject Copy(SharpTreeNode[] nodes)
 		{
-			DataObject dataObject = new DataObject();
+			var dataObject = new WpfWindowsDataObject(new DataObject());
 			dataObject.SetData(DataFormat, nodes.OfType<AssemblyTreeNode>().Select(n => n.LoadedAssembly.FileName).ToArray());
 			return dataObject;
 		}

ILSpy/TreeNodes/BaseTypesEntryNode.cs

@@ -21,6 +21,7 @@ using System.Linq;
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.TreeView;
+using ICSharpCode.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.ILSpy.TreeNodes
 {
@@ -37,7 +38,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 
 		public override object Icon => type.Kind == TypeKind.Interface ? Images.Interface : Images.Class;
 
-		public override void ActivateItem(System.Windows.RoutedEventArgs e)
+		public override void ActivateItem(IPlatformRoutedEventArgs e)
 		{
 			e.Handled = ActivateItem(this, type);
 		}

ILSpy/TreeNodes/DerivedTypesEntryNode.cs

@@ -26,6 +26,7 @@ using ICSharpCode.ILSpyX;
 namespace ICSharpCode.ILSpy.TreeNodes
 {
 	using ICSharpCode.Decompiler.TypeSystem;
+	using ICSharpCode.TreeView.PlatformAbstractions;
 
 	class DerivedTypesEntryNode : ILSpyTreeNode, IMemberTreeNode
 	{
@@ -89,7 +90,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			return DerivedTypesTreeNode.FindDerivedTypes(list, type, ct);
 		}
 
-		public override void ActivateItem(System.Windows.RoutedEventArgs e)
+		public override void ActivateItem(IPlatformRoutedEventArgs e)
 		{
 			e.Handled = BaseTypesEntryNode.ActivateItem(this, type);
 		}

ILSpy/TreeNodes/ILSpyTreeNode.cs

@@ -31,6 +31,7 @@ using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.ILSpy.Options;
 using ICSharpCode.ILSpyX.Abstractions;
 using ICSharpCode.TreeView;
+using ICSharpCode.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.ILSpy.TreeNodes
 {
@@ -77,7 +78,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			return false;
 		}
 
-		public override void ActivateItemSecondary(RoutedEventArgs e)
+		public override void ActivateItemSecondary(IPlatformRoutedEventArgs e)
 		{
 			MainWindow.Instance.SelectNode(this, inNewTabPage: true);
 			MainWindow.Instance.Dispatcher.BeginInvoke(DispatcherPriority.Background, (Action)MainWindow.Instance.RefreshDecompiledView);

ILSpy/TreeNodes/ModuleReferenceTreeNode.cs

@@ -21,6 +21,7 @@ using System.Reflection.Metadata;
 
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Metadata;
+using ICSharpCode.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.ILSpy.TreeNodes
 {
@@ -69,7 +70,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 
 		public override object Icon => Images.Library;
 
-		public override void ActivateItem(System.Windows.RoutedEventArgs e)
+		public override void ActivateItem(IPlatformRoutedEventArgs e)
 		{
 			var assemblyListNode = parentAssembly.Parent as AssemblyListTreeNode;
 			if (assemblyListNode != null && containsMetadata)

SharpTreeView/PlatformAbstractions/IPlatformDataObject.cs

@@ -0,0 +1,10 @@
+namespace ICSharpCode.TreeView.PlatformAbstractions
+{
+	public interface IPlatformDataObject
+	{
+		bool GetDataPresent(string format);
+		object GetData(string format);
+
+		void SetData(string format, object data);
+	}
+}

SharpTreeView/PlatformAbstractions/IPlatformDragDrop.cs

@@ -0,0 +1,7 @@
+namespace ICSharpCode.TreeView.PlatformAbstractions
+{
+	public interface IPlatformDragDrop
+	{
+		XPlatDragDropEffects DoDragDrop(object dragSource, object data, XPlatDragDropEffects allowedEffects);
+	}
+}

SharpTreeView/PlatformAbstractions/IPlatformDragEventArgs.cs

@@ -0,0 +1,8 @@
+namespace ICSharpCode.TreeView.PlatformAbstractions
+{
+	public interface IPlatformDragEventArgs
+	{
+		XPlatDragDropEffects Effects { get; set; }
+		IPlatformDataObject Data { get; }
+	}
+}

SharpTreeView/PlatformAbstractions/IPlatformRoutedEventArgs.cs

@@ -0,0 +1,7 @@
+namespace ICSharpCode.TreeView.PlatformAbstractions
+{
+	public interface IPlatformRoutedEventArgs
+	{
+		bool Handled { get; set; }
+	}
+}

SharpTreeView/PlatformAbstractions/WpfWindows/WpfWindowsDataObject.cs

@@ -0,0 +1,29 @@
+using System.Windows;
+
+namespace ICSharpCode.TreeView.PlatformAbstractions.WpfWindows
+{
+	public class WpfWindowsDataObject : IPlatformDataObject
+	{
+		private readonly IDataObject _dataObject;
+
+		public WpfWindowsDataObject(IDataObject dataObject)
+		{
+			_dataObject = dataObject;
+		}
+
+		public object GetData(string format)
+		{
+			return _dataObject.GetData(format);
+		}
+
+		public bool GetDataPresent(string format)
+		{
+			return _dataObject.GetDataPresent(format);
+		}
+
+		public void SetData(string format, object data)
+		{
+			_dataObject.SetData(format, data);
+		}
+	}
+}

SharpTreeView/PlatformAbstractions/WpfWindows/WpfWindowsDragDropManager.cs

@@ -0,0 +1,12 @@
+using System.Windows;
+
+namespace ICSharpCode.TreeView.PlatformAbstractions.WpfWindows
+{
+	public class WpfWindowsDragDropManager : IPlatformDragDrop
+	{
+		public XPlatDragDropEffects DoDragDrop(object dragSource, object data, XPlatDragDropEffects allowedEffects)
+		{
+			return (XPlatDragDropEffects)DragDrop.DoDragDrop(dragSource as DependencyObject, data, (DragDropEffects)allowedEffects);
+		}
+	}
+}

SharpTreeView/PlatformAbstractions/WpfWindows/WpfWindowsDragEventArgs.cs

@@ -0,0 +1,18 @@
+using System.Windows;
+
+namespace ICSharpCode.TreeView.PlatformAbstractions.WpfWindows
+{
+	public class WpfWindowsDragEventArgs : IPlatformDragEventArgs
+	{
+		private readonly DragEventArgs _eventArgs;
+
+		public WpfWindowsDragEventArgs(DragEventArgs eventArgs)
+		{
+			_eventArgs = eventArgs;
+		}
+
+		public XPlatDragDropEffects Effects { get => (XPlatDragDropEffects)_eventArgs.Effects; set => _eventArgs.Effects = (DragDropEffects)value; }
+
+		public IPlatformDataObject Data => new WpfWindowsDataObject(_eventArgs.Data);
+	}
+}

SharpTreeView/PlatformAbstractions/WpfWindows/WpfWindowsRoutedEventArgs.cs

@@ -0,0 +1,16 @@
+using System.Windows;
+
+namespace ICSharpCode.TreeView.PlatformAbstractions.WpfWindows
+{
+	public class WpfWindowsRoutedEventArgs : IPlatformRoutedEventArgs
+	{
+		private readonly RoutedEventArgs _eventArgs;
+
+		public WpfWindowsRoutedEventArgs(RoutedEventArgs eventArgs)
+		{
+			_eventArgs = eventArgs;
+		}
+
+		public bool Handled { get => _eventArgs.Handled; set => _eventArgs.Handled = value; }
+	}
+}

SharpTreeView/PlatformAbstractions/XPlatDragDropEffects.cs

@@ -0,0 +1,36 @@
+using System;
+
+namespace ICSharpCode.TreeView.PlatformAbstractions
+{
+	//
+	// Summary:
+	//     Specifies the effects of a drag-and-drop operation.
+	[Flags]
+	public enum XPlatDragDropEffects
+	{
+		//
+		// Summary:
+		//     Scrolling is about to start or is currently occurring in the drop target.
+		Scroll = int.MinValue,
+		//
+		// Summary:
+		//     The data is copied, removed from the drag source, and scrolled in the drop target.
+		All = -2147483645,
+		//
+		// Summary:
+		//     The drop target does not accept the data.
+		None = 0,
+		//
+		// Summary:
+		//     The data is copied to the drop target.
+		Copy = 1,
+		//
+		// Summary:
+		//     The data from the drag source is moved to the drop target.
+		Move = 2,
+		//
+		// Summary:
+		//     The data from the drag source is linked to the drop target.
+		Link = 4
+	}
+}

SharpTreeView/SharpTreeNode.cs

@@ -22,9 +22,8 @@ using System.Collections.Specialized;
 using System.ComponentModel;
 using System.Diagnostics;
 using System.Linq;
-using System.Windows;
-using System.Windows.Input;
-using System.Windows.Media;
+
+using ICSharpCode.TreeView.PlatformAbstractions;
 
 namespace ICSharpCode.TreeView
 {
@@ -584,7 +583,7 @@ namespace ICSharpCode.TreeView
 			throw new NotSupportedException(GetType().Name + " does not support deletion");
 		}
 
-		public virtual IDataObject Copy(SharpTreeNode[] nodes)
+		public virtual IPlatformDataObject Copy(SharpTreeNode[] nodes)
 		{
 			throw new NotSupportedException(GetType().Name + " does not support copy/paste or drag'n'drop");
 		}
@@ -614,25 +613,26 @@ namespace ICSharpCode.TreeView
 			return false;
 		}
 
-		public virtual void StartDrag(DependencyObject dragSource, SharpTreeNode[] nodes)
+		public virtual void StartDrag(object dragSource, SharpTreeNode[] nodes, IPlatformDragDrop dragdropManager)
 		{
-			DragDropEffects effects = DragDropEffects.All;
+			XPlatDragDropEffects effects = XPlatDragDropEffects.All;
 			if (!nodes.All(n => n.CanDelete()))
-				effects &= ~DragDropEffects.Move;
-			DragDropEffects result = DragDrop.DoDragDrop(dragSource, Copy(nodes), effects);
-			if (result == DragDropEffects.Move)
+				effects &= ~XPlatDragDropEffects.Move;
+
+			XPlatDragDropEffects result = dragdropManager.DoDragDrop(dragSource, Copy(nodes), effects);
+			if (result == XPlatDragDropEffects.Move)
 			{
 				foreach (SharpTreeNode node in nodes)
 					node.DeleteCore();
 			}
 		}
 
-		public virtual bool CanDrop(DragEventArgs e, int index)
+		public virtual bool CanDrop(IPlatformDragEventArgs e, int index)
 		{
 			return false;
 		}
 
-		internal void InternalDrop(DragEventArgs e, int index)
+		internal void InternalDrop(IPlatformDragEventArgs e, int index)
 		{
 			if (LazyLoading)
 			{
@@ -643,7 +643,7 @@ namespace ICSharpCode.TreeView
 			Drop(e, index);
 		}
 
-		public virtual void Drop(DragEventArgs e, int index)
+		public virtual void Drop(IPlatformDragEventArgs e, int index)
 		{
 			throw new NotSupportedException(GetType().Name + " does not support Drop()");
 		}
@@ -703,14 +703,14 @@ namespace ICSharpCode.TreeView
 		/// <summary>
 		/// Gets called when the item is double-clicked.
 		/// </summary>
-		public virtual void ActivateItem(RoutedEventArgs e)
+		public virtual void ActivateItem(IPlatformRoutedEventArgs e)
 		{
 		}
 
 		/// <summary>
 		/// Gets called when the item is clicked with the middle mouse button.
 		/// </summary>
-		public virtual void ActivateItemSecondary(RoutedEventArgs e)
+		public virtual void ActivateItemSecondary(IPlatformRoutedEventArgs e)
 		{
 		}
 

SharpTreeView/SharpTreeView.cs

@@ -28,6 +28,8 @@ using System.Windows.Documents;
 using System.Windows.Input;
 using System.Windows.Threading;
 
+using ICSharpCode.TreeView.PlatformAbstractions.WpfWindows;
+
 namespace ICSharpCode.TreeView
 {
 	public class SharpTreeView : ListView
@@ -303,7 +305,7 @@ namespace ICSharpCode.TreeView
 					if (container != null && Keyboard.Modifiers == ModifierKeys.None && this.SelectedItems.Count == 1 && this.SelectedItem == container.Node)
 					{
 						e.Handled = true;
-						container.Node.ActivateItem(e);
+						container.Node.ActivateItem(new WpfWindowsRoutedEventArgs(e));
 					}
 					break;
 				case Key.Space:
@@ -319,7 +321,7 @@ namespace ICSharpCode.TreeView
 						}
 						else
 						{
-							container.Node.ActivateItem(e);
+							container.Node.ActivateItem(new WpfWindowsRoutedEventArgs(e));
 						}
 					}
 					break;
@@ -462,7 +464,7 @@ namespace ICSharpCode.TreeView
 			if (Root != null && !ShowRoot)
 			{
 				e.Handled = true;
-				Root.CanDrop(e, Root.Children.Count);
+				Root.CanDrop(new WpfWindowsDragEventArgs(e), Root.Children.Count);
 			}
 		}
 
@@ -473,7 +475,7 @@ namespace ICSharpCode.TreeView
 			if (Root != null && !ShowRoot)
 			{
 				e.Handled = true;
-				Root.InternalDrop(e, Root.Children.Count);
+				Root.InternalDrop(new WpfWindowsDragEventArgs(e), Root.Children.Count);
 			}
 		}
 
@@ -504,7 +506,7 @@ namespace ICSharpCode.TreeView
 				if (target != null)
 				{
 					e.Handled = true;
-					target.Node.InternalDrop(e, target.Index);
+					target.Node.InternalDrop(new WpfWindowsDragEventArgs(e), target.Index);
 				}
 			}
 			catch (Exception ex)
@@ -612,7 +614,7 @@ namespace ICSharpCode.TreeView
 			if (node != null)
 			{
 				e.Effects = DragDropEffects.None;
-				if (node.CanDrop(e, index))
+				if (node.CanDrop(new WpfWindowsDragEventArgs(e), index))
 				{
 					DropTarget target = new DropTarget() {
 						Item = item,

SharpTreeView/SharpTreeViewItem.cs

@@ -22,6 +22,8 @@ using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
 
+using ICSharpCode.TreeView.PlatformAbstractions.WpfWindows;
+
 namespace ICSharpCode.TreeView
 {
 	public class SharpTreeViewItem : ListViewItem
@@ -103,7 +105,7 @@ namespace ICSharpCode.TreeView
 					var selection = ParentTreeView.GetTopLevelSelection().ToArray();
 					if (Node.CanDrag(selection))
 					{
-						Node.StartDrag(this, selection);
+						Node.StartDrag(this, selection, new WpfWindowsDragDropManager());
 					}
 				}
 			}
@@ -114,7 +116,7 @@ namespace ICSharpCode.TreeView
 			if (wasDoubleClick)
 			{
 				wasDoubleClick = false;
-				Node.ActivateItem(e);
+				Node.ActivateItem(new WpfWindowsRoutedEventArgs(e));
 				if (!e.Handled)
 				{
 					if (!Node.IsRoot || ParentTreeView.ShowRootExpander)
@@ -135,7 +137,7 @@ namespace ICSharpCode.TreeView
 		{
 			if (e.ChangedButton == MouseButton.Middle)
 			{
-				Node.ActivateItemSecondary(e);
+				Node.ActivateItemSecondary(new WpfWindowsRoutedEventArgs(e));
 			}
 			else
 			{