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ICSharpCode.TextEditor/Project/Src/Document/Selection/DefaultSelection.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;
+using System.Diagnostics;
+using System.Drawing;
+
+namespace ICSharpCode.TextEditor.Document
+{
+	/// <summary>
+	/// Default implementation of the <see cref="ICSharpCode.TextEditor.Document.ISelection"/> interface.
+	/// </summary>
+	public class DefaultSelection : ISelection
+	{
+		IDocument document;
+		bool      isRectangularSelection;
+		TextLocation     startPosition;
+		TextLocation     endPosition;
+		
+		public TextLocation StartPosition {
+			get {
+				return startPosition;
+			}
+			set {
+				DefaultDocument.ValidatePosition(document, value);
+				startPosition = value;
+			}
+		}
+		
+		public TextLocation EndPosition {
+			get {
+				return endPosition;
+			}
+			set {
+				DefaultDocument.ValidatePosition(document, value);
+				endPosition = value;
+			}
+		}
+		
+		public int Offset {
+			get {
+				return document.PositionToOffset(startPosition);
+			}
+		}
+		
+		public int EndOffset {
+			get {
+				return document.PositionToOffset(endPosition);
+			}
+		}
+		
+		public int Length {
+			get {
+				return EndOffset - Offset;
+			}
+		}
+		
+		/// <value>
+		/// Returns true, if the selection is empty
+		/// </value>
+		public bool IsEmpty {
+			get {
+				return startPosition == endPosition;
+			}
+		}
+		
+		/// <value>
+		/// Returns true, if the selection is rectangular
+		/// </value>
+		// TODO : make this unused property used.
+		public bool IsRectangularSelection {
+			get {
+				return isRectangularSelection;
+			}
+			set {
+				isRectangularSelection = value;
+			}
+		}
+		
+		/// <value>
+		/// The text which is selected by this selection.
+		/// </value>
+		public string SelectedText {
+			get {
+				if (document != null) {
+					if (Length < 0) {
+						return null;
+					}
+					return document.GetText(Offset, Length);
+				}
+				return null;
+			}
+		}
+		
+		/// <summary>
+		/// Creates a new instance of <see cref="DefaultSelection"/>
+		/// </summary>
+		public DefaultSelection(IDocument document, TextLocation startPosition, TextLocation endPosition)
+		{
+			DefaultDocument.ValidatePosition(document, startPosition);
+			DefaultDocument.ValidatePosition(document, endPosition);
+			Debug.Assert(startPosition <= endPosition);
+			this.document      = document;
+			this.startPosition = startPosition;
+			this.endPosition   = endPosition;
+		}
+		
+		/// <summary>
+		/// Converts a <see cref="DefaultSelection"/> instance to string (for debug purposes)
+		/// </summary>
+		public override string ToString()
+		{
+			return string.Format("[DefaultSelection : StartPosition={0}, EndPosition={1}]", startPosition, endPosition);
+		}
+		public bool ContainsPosition(TextLocation position)
+		{
+			if (this.IsEmpty)
+				return false;
+			return startPosition.Y < position.Y && position.Y  < endPosition.Y ||
+				startPosition.Y == position.Y && startPosition.X <= position.X && (startPosition.Y != endPosition.Y || position.X <= endPosition.X) ||
+				endPosition.Y == position.Y && startPosition.Y != endPosition.Y && position.X <= endPosition.X;
+		}
+		
+		public bool ContainsOffset(int offset)
+		{
+			return Offset <= offset && offset <= EndOffset;
+		}
+	}
+}