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Using AvalonEdit (WPF Text Editor)

, 1 Apr 2013
AvalonEdit is an extensible Open-Source text editor with support for syntax highlighting and folding.
AvalonEdit_4.3.1_Binaries-noexe.zip
AvalonEdit_4.3.1_Binaries.zip
AvalonEdit.Sample.exe
ICSharpCode.AvalonEdit.dll
AvalonEdit_4.3.1_Source-noexe.zip
AvalonEdit.Sample
AvalonEdit
dependencies.png
folding.png
renderingPipeline.png
screenshot.png
snoop.png
CustomHighlighting.xshd
Images
Copy.png
Cut.png
Delete.png
Open.png
Paste.png
Redo.png
Save.png
Undo.png
WordWrap.png
Properties
RenderingPipeline.pptx
Documentation
Architecture.aml
Code Completion.aml
Coordinate Systems.aml
Folding.aml
ICSharpCode.AvalonEdit.content
ICSharpCode.AvalonEdit.shfbproj
Media
NamespaceDependencies.png
RenderingPipeline.png
VisualTree.png
WelcomeScreenshot.png
Sample Application.aml
Syntax Highlighting.aml
Text Rendering.aml
Welcome.aml
ICSharpCode.AvalonEdit.Tests
Document
Editing
Highlighting
ICSharpCode.AvalonEdit.Tests.PartCover.Settings
Properties
Search
Utils
ICSharpCode.AvalonEdit
CodeCompletion
Document
Editing
Folding
Highlighting
Resources
ASPX.xshd
Boo.xshd
Coco-Mode.xshd
CPP-Mode.xshd
CSharp-Mode.xshd
CSS-Mode.xshd
HTML-Mode.xshd
Java-Mode.xshd
JavaScript-Mode.xshd
MarkDown-Mode.xshd
Patch-Mode.xshd
PHP-Mode.xshd
PowerShell.xshd
Tex-Mode.xshd
VBNET-Mode.xshd
XML-Mode.xshd
XmlDoc.xshd
Xshd
ICSharpCode.AvalonEdit.snk
Indentation
CSharp
Properties
Rendering
Search
next.png
prev.png
Snippets
themes
RightArrow.cur
Utils
Xml
AvalonEdit_4.3.1_Source.zip
dependencies.png
folding.png
renderingPipeline.png
screenshot.png
snoop.png
CustomHighlighting.xshd
Copy.png
Cut.png
Delete.png
Open.png
Paste.png
Redo.png
Save.png
Undo.png
WordWrap.png
RenderingPipeline.pptx
Architecture.aml
Code Completion.aml
Coordinate Systems.aml
Folding.aml
ICSharpCode.AvalonEdit.content
ICSharpCode.AvalonEdit.shfbproj
NamespaceDependencies.png
RenderingPipeline.png
VisualTree.png
WelcomeScreenshot.png
Sample Application.aml
Syntax Highlighting.aml
Text Rendering.aml
Welcome.aml
ICSharpCode.AvalonEdit.Tests.PartCover.Settings
nunit.framework.dll
ASPX.xshd
Boo.xshd
Coco-Mode.xshd
CPP-Mode.xshd
CSharp-Mode.xshd
CSS-Mode.xshd
HTML-Mode.xshd
Java-Mode.xshd
JavaScript-Mode.xshd
MarkDown-Mode.xshd
Patch-Mode.xshd
PHP-Mode.xshd
PowerShell.xshd
Tex-Mode.xshd
VBNET-Mode.xshd
XML-Mode.xshd
XmlDoc.xshd
ICSharpCode.AvalonEdit.snk
next.png
prev.png
RightArrow.cur
AvalonEdit_Binaries-noexe.zip
AvalonEdit_Binaries.zip
AvalonEdit.Sample.exe
ICSharpCode.AvalonEdit.dll
AvalonEdit_CHM_Documentation.zip
AvalonEdit Documentation.chm
AvalonEdit_Source.zip
dependencies.png
folding.png
renderingPipeline.png
screenshot.png
snoop.png
CustomHighlighting.xshd
Copy.png
Cut.png
Delete.png
Open.png
Paste.png
Redo.png
Save.png
Undo.png
WordWrap.png
RenderingPipeline.pptx
Architecture.aml
Code Completion.aml
Coordinate Systems.aml
Folding.aml
Help
ICSharpCode.AvalonEdit.content
ICSharpCode.AvalonEdit.shfbproj
NamespaceDependencies.png
RenderingPipeline.png
VisualTree.png
WelcomeScreenshot.png
Sample Application.aml
Syntax Highlighting.aml
Text Rendering.aml
Welcome.aml
ICSharpCode.AvalonEdit.Tests.PartCover.Settings
nunit.framework.dll
ASPX.xshd
Boo.xshd
Coco-Mode.xshd
CPP-Mode.xshd
CSharp-Mode.xshd
CSS-Mode.xshd
HTML-Mode.xshd
Java-Mode.xshd
JavaScript-Mode.xshd
Patch-Mode.xshd
PHP-Mode.xshd
PowerShell.xshd
Tex-Mode.xshd
VBNET-Mode.xshd
XML-Mode.xshd
XmlDoc.xshd
ICSharpCode.AvalonEdit.snk
next.png
prev.png
RightArrow.cur
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Collections.Generic;
using System.Diagnostics;

using ICSharpCode.AvalonEdit.Document;

namespace ICSharpCode.AvalonEdit.Rendering
{
	/// <summary>
	/// A node in the text view's height tree.
	/// </summary>
	sealed class HeightTreeNode
	{
		internal readonly DocumentLine documentLine;
		internal HeightTreeLineNode lineNode;
		
		internal HeightTreeNode left, right, parent;
		internal bool color;
		
		internal HeightTreeNode()
		{
		}
		
		internal HeightTreeNode(DocumentLine documentLine, double height)
		{
			this.documentLine = documentLine;
			this.totalCount = 1;
			this.lineNode = new HeightTreeLineNode(height);
			this.totalHeight = height;
		}
		
		internal HeightTreeNode LeftMost {
			get {
				HeightTreeNode node = this;
				while (node.left != null)
					node = node.left;
				return node;
			}
		}
		
		internal HeightTreeNode RightMost {
			get {
				HeightTreeNode node = this;
				while (node.right != null)
					node = node.right;
				return node;
			}
		}
		
		/// <summary>
		/// Gets the inorder successor of the node.
		/// </summary>
		internal HeightTreeNode Successor {
			get {
				if (right != null) {
					return right.LeftMost;
				} else {
					HeightTreeNode node = this;
					HeightTreeNode oldNode;
					do {
						oldNode = node;
						node = node.parent;
						// go up until we are coming out of a left subtree
					} while (node != null && node.right == oldNode);
					return node;
				}
			}
		}
		
		/// <summary>
		/// The number of lines in this node and its child nodes.
		/// Invariant:
		///   totalCount = 1 + left.totalCount + right.totalCount
		/// </summary>
		internal int totalCount;
		
		/// <summary>
		/// The total height of this node and its child nodes, excluding directly collapsed nodes.
		/// Invariant:
		///   totalHeight = left.IsDirectlyCollapsed ? 0 : left.totalHeight
		///               + lineNode.IsDirectlyCollapsed ? 0 : lineNode.Height
		///               + right.IsDirectlyCollapsed ? 0 : right.totalHeight
		/// </summary>
		internal double totalHeight;
		
		/// <summary>
		/// List of the sections that hold this node collapsed.
		/// Invariant 1:
		///   For each document line in the range described by a CollapsedSection, exactly one ancestor
		///   contains that CollapsedSection.
		/// Invariant 2:
		///   A CollapsedSection is contained either in left+middle or middle+right or just middle.
		/// Invariant 3:
		///   Start and end of a CollapsedSection always contain the collapsedSection in their
		///   documentLine (middle node).
		/// </summary>
		internal List<CollapsedLineSection> collapsedSections;
		
		internal bool IsDirectlyCollapsed {
			get {
				return collapsedSections != null;
			}
		}
		
		internal void AddDirectlyCollapsed(CollapsedLineSection section)
		{
			if (collapsedSections == null) {
				collapsedSections = new List<CollapsedLineSection>();
				totalHeight = 0;
			}
			Debug.Assert(!collapsedSections.Contains(section));
			collapsedSections.Add(section);
		}
		
		
		internal void RemoveDirectlyCollapsed(CollapsedLineSection section)
		{
			Debug.Assert(collapsedSections.Contains(section));
			collapsedSections.Remove(section);
			if (collapsedSections.Count == 0) {
				collapsedSections = null;
				totalHeight = lineNode.TotalHeight;
				if (left != null)
					totalHeight += left.totalHeight;
				if (right != null)
					totalHeight += right.totalHeight;
			}
		}
		
		#if DEBUG
		public override string ToString()
		{
			return "[HeightTreeNode "
				+ documentLine.LineNumber + " CS=" + GetCollapsedSections(collapsedSections)
				+ " Line.CS=" + GetCollapsedSections(lineNode.collapsedSections)
				+ " Line.Height=" + lineNode.height
				+ " TotalHeight=" + totalHeight
				+ "]";
		}
		
		static string GetCollapsedSections(List<CollapsedLineSection> list)
		{
			if (list == null)
				return "{}";
			return "{" +
				string.Join(",",
				            list.ConvertAll(cs=>cs.ID).ToArray())
				+ "}";
		}
		#endif
	}
}

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This article, along with any associated source code and files, is licensed under The GNU Lesser General Public License (LGPLv3)

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About the Author

Daniel Grunwald

Germany Germany
I am the lead developer on the SharpDevelop open source project.
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