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ICSharpCode.TextEditor/Project/Src/Document/FoldingStrategy/FoldMarker.cs

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+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+
+namespace ICSharpCode.TextEditor.Document
+{
+	public enum FoldType {
+		Unspecified,
+		MemberBody,
+		Region,
+		TypeBody
+	}
+	
+	public class FoldMarker : AbstractSegment, IComparable
+	{
+		bool      isFolded = false;
+		string    foldText = "...";
+		FoldType  foldType = FoldType.Unspecified;
+		IDocument document = null;
+		int startLine = -1, startColumn, endLine = -1, endColumn;
+		
+		static void GetPointForOffset(IDocument document, int offset, out int line, out int column)
+		{
+			if (offset > document.TextLength) {
+				line = document.TotalNumberOfLines + 1;
+				column = 1;
+			} else if (offset < 0) {
+				line = -1;
+				column = -1;
+			} else {
+				line = document.GetLineNumberForOffset(offset);
+				column = offset - document.GetLineSegment(line).Offset;
+			}
+		}
+		
+		public FoldType FoldType {
+			get { return foldType; }
+			set { foldType = value; }
+		}
+		
+		public int StartLine {
+			get {
+				if (startLine < 0) {
+					GetPointForOffset(document, offset, out startLine, out startColumn);
+				}
+				return startLine;
+			}
+		}
+		
+		public int StartColumn {
+			get {
+				if (startLine < 0) {
+					GetPointForOffset(document, offset, out startLine, out startColumn);
+				}
+				return startColumn;
+			}
+		}
+		
+		public int EndLine {
+			get {
+				if (endLine < 0) {
+					GetPointForOffset(document, offset + length, out endLine, out endColumn);
+				}
+				return endLine;
+			}
+		}
+		
+		public int EndColumn {
+			get {
+				if (endLine < 0) {
+					GetPointForOffset(document, offset + length, out endLine, out endColumn);
+				}
+				return endColumn;
+			}
+		}
+		
+		public override int Offset {
+			get { return base.Offset; }
+			set {
+				base.Offset = value;
+				startLine = -1; endLine = -1;
+			}
+		}
+		public override int Length {
+			get { return base.Length; }
+			set {
+				base.Length = value;
+				endLine = -1;
+			}
+		}
+		
+		public bool IsFolded {
+			get {
+				return isFolded;
+			}
+			set {
+				isFolded = value;
+			}
+		}
+		
+		public string FoldText {
+			get {
+				return foldText;
+			}
+		}
+		
+		public string InnerText {
+			get {
+				return document.GetText(offset, length);
+			}
+		}
+		
+		public FoldMarker(IDocument document, int offset, int length, string foldText, bool isFolded)
+		{
+			this.document = document;
+			this.offset   = offset;
+			this.length   = length;
+			this.foldText = foldText;
+			this.isFolded = isFolded;
+		}
+		
+		public FoldMarker(IDocument document, int startLine, int startColumn, int endLine, int endColumn) : this(document, startLine, startColumn, endLine, endColumn, FoldType.Unspecified)
+		{
+		}
+		
+		public FoldMarker(IDocument document, int startLine, int startColumn, int endLine, int endColumn, FoldType foldType)  : this(document, startLine, startColumn, endLine, endColumn, foldType, "...")
+		{
+		}
+		
+		public FoldMarker(IDocument document, int startLine, int startColumn, int endLine, int endColumn, FoldType foldType, string foldText) : this(document, startLine, startColumn, endLine, endColumn, foldType, foldText, false)
+		{
+		}
+		
+		public FoldMarker(IDocument document, int startLine, int startColumn, int endLine, int endColumn, FoldType foldType, string foldText, bool isFolded)
+		{
+			this.document = document;
+			
+			startLine = Math.Min(document.TotalNumberOfLines - 1, Math.Max(startLine, 0));
+			ISegment startLineSegment = document.GetLineSegment(startLine);
+			
+			endLine = Math.Min(document.TotalNumberOfLines - 1, Math.Max(endLine, 0));
+			ISegment endLineSegment   = document.GetLineSegment(endLine);
+			
+			// Prevent the region from completely disappearing
+			if (string.IsNullOrEmpty(foldText)) {
+				foldText = "...";
+			}
+			
+			this.FoldType = foldType;
+			this.foldText = foldText;
+			this.offset = startLineSegment.Offset + Math.Min(startColumn, startLineSegment.Length);
+			this.length = (endLineSegment.Offset + Math.Min(endColumn, endLineSegment.Length)) - this.offset;
+			this.isFolded = isFolded;
+		}
+		
+		public int CompareTo(object o)
+		{
+			if (!(o is FoldMarker)) {
+				throw new ArgumentException();
+			}
+			FoldMarker f = (FoldMarker)o;
+			if (offset != f.offset) {
+				return offset.CompareTo(f.offset);
+			}
+			
+			return length.CompareTo(f.length);
+		}
+	}
+}