Adapt folding commands from SharpDevelop

ILSpy/ContextMenuEntry.cs

@@ -21,6 +21,8 @@ using System.ComponentModel.Composition;
 using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
+
+using ICSharpCode.AvalonEdit;
 using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.TreeView;
 
@@ -59,15 +61,23 @@ namespace ICSharpCode.ILSpy
 		/// </summary>
 		public ReferenceSegment Reference { get; private set; }
 		
+		/// <summary>
+		/// Returns the position in TextView the mouse cursor is currently hovering above.
+		/// Returns null, if TextView returns null;
+		/// </summary>
+		public TextViewPosition? Position { get; private set; }
+		
 		public static TextViewContext Create(SharpTreeView treeView = null, DecompilerTextView textView = null)
 		{
 			var reference = textView != null ? textView.GetReferenceSegmentAtMousePosition() : null;
+			var position = textView != null ? textView.GetPositionFromMousePosition() : null;
 			var selectedTreeNodes = treeView != null ? treeView.GetTopLevelSelection().ToArray() : null;
 			return new TextViewContext {
 				TreeView = treeView,
 				SelectedTreeNodes = selectedTreeNodes,
 				TextView = textView,
-				Reference = reference
+				Reference = reference,
+				Position = position
 			};
 		}
 	}

ILSpy/TextView/DecompilerTextView.cs

@@ -763,19 +763,18 @@ namespace ICSharpCode.ILSpy.TextView
 
 		internal ReferenceSegment GetReferenceSegmentAtMousePosition()
 		{
-			TextViewPosition? position = textEditor.TextArea.TextView.GetPosition(Mouse.GetPosition(textEditor.TextArea.TextView) + textEditor.TextArea.TextView.ScrollOffset);
+			TextViewPosition? position = GetPositionFromMousePosition();
 			if (position == null)
 				return null;
 			int offset = textEditor.Document.GetOffset(position.Value.Location);
 			return referenceElementGenerator.References.FindSegmentsContaining(offset).FirstOrDefault();
 		}
 		
-		public int CurrentOffset {
-			get {
-				return textEditor.CaretOffset;
-			}
+		internal TextViewPosition? GetPositionFromMousePosition()
+		{
+			return textEditor.TextArea.TextView.GetPosition(Mouse.GetPosition(textEditor.TextArea.TextView) + textEditor.TextArea.TextView.ScrollOffset);
 		}
-
+		
 		public DecompilerTextViewState GetState()
 		{
 			if (decompiledNodes == null)

ILSpy/TextView/FoldingCommands.cs

@@ -10,6 +10,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 
+using ICSharpCode.AvalonEdit;
 using ICSharpCode.AvalonEdit.Folding;
 
 namespace ICSharpCode.ILSpy.TextView
@@ -62,16 +63,23 @@ namespace ICSharpCode.ILSpy.TextView
     
     public void Execute(TextViewContext context)
     {
-      if (null == context.TextView)
-        return;
+    	var textView = context.TextView;
+    	if (null == textView)
+    		return;
+      var editor = textView.textEditor;
       FoldingManager foldingManager = context.TextView.FoldingManager;
       if (null == foldingManager)
         return;
-      int offset = context.TextView.CurrentOffset;
-      FoldingSection folding = foldingManager.GetNextFolding(offset);
-      if (folding == null || folding.StartOffset != offset) {
-        // no folding found on current line: find innermost folding containing the caret
-        folding = foldingManager.GetFoldingsContaining(offset).LastOrDefault();
+    	// TODO: or use Caret if position is not given?
+      var posBox = context.Position;
+    	if (null == posBox)
+        return;
+      TextViewPosition pos = posBox.Value;
+			// look for folding on this line:
+			FoldingSection folding = foldingManager.GetNextFolding(editor.Document.GetOffset(pos.Line, 1));
+			if (folding == null || editor.Document.GetLineByOffset(folding.StartOffset).LineNumber != pos.Line) {
+        // no folding found on current line: find innermost folding containing the mouse position
+        folding = foldingManager.GetFoldingsContaining(editor.Document.GetOffset(pos.Line, pos.Column)).LastOrDefault();
       }
       if (folding != null) {
         folding.IsFolded = !folding.IsFolded;