134 lines
3.2 KiB
C#
134 lines
3.2 KiB
C#
// <file>
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// <copyright see="prj:///doc/copyright.txt"/>
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// <license see="prj:///doc/license.txt"/>
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// <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
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// <version>$Revision$</version>
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// </file>
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using System;
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using System.Diagnostics;
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using System.Drawing;
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namespace ICSharpCode.TextEditor.Document
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{
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/// <summary>
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/// Default implementation of the <see cref="ICSharpCode.TextEditor.Document.ISelection"/> interface.
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/// </summary>
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public class DefaultSelection : ISelection
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{
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IDocument document;
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bool isRectangularSelection;
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TextLocation startPosition;
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TextLocation endPosition;
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public TextLocation StartPosition {
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get {
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return startPosition;
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}
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set {
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DefaultDocument.ValidatePosition(document, value);
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startPosition = value;
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}
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}
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public TextLocation EndPosition {
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get {
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return endPosition;
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}
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set {
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DefaultDocument.ValidatePosition(document, value);
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endPosition = value;
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}
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}
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public int Offset {
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get {
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return document.PositionToOffset(startPosition);
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}
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}
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public int EndOffset {
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get {
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return document.PositionToOffset(endPosition);
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}
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}
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public int Length {
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get {
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return EndOffset - Offset;
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}
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}
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/// <value>
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/// Returns true, if the selection is empty
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/// </value>
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public bool IsEmpty {
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get {
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return startPosition == endPosition;
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}
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}
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/// <value>
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/// Returns true, if the selection is rectangular
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/// </value>
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// TODO : make this unused property used.
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public bool IsRectangularSelection {
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get {
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return isRectangularSelection;
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}
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set {
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isRectangularSelection = value;
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}
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}
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/// <value>
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/// The text which is selected by this selection.
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/// </value>
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public string SelectedText {
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get {
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if (document != null) {
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if (Length < 0) {
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return null;
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}
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return document.GetText(Offset, Length);
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}
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return null;
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}
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}
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/// <summary>
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/// Creates a new instance of <see cref="DefaultSelection"/>
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/// </summary>
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public DefaultSelection(IDocument document, TextLocation startPosition, TextLocation endPosition)
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{
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DefaultDocument.ValidatePosition(document, startPosition);
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DefaultDocument.ValidatePosition(document, endPosition);
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Debug.Assert(startPosition <= endPosition);
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this.document = document;
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this.startPosition = startPosition;
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this.endPosition = endPosition;
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}
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/// <summary>
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/// Converts a <see cref="DefaultSelection"/> instance to string (for debug purposes)
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/// </summary>
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public override string ToString()
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{
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return string.Format("[DefaultSelection : StartPosition={0}, EndPosition={1}]", startPosition, endPosition);
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}
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public bool ContainsPosition(TextLocation position)
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{
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if (this.IsEmpty)
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return false;
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return startPosition.Y < position.Y && position.Y < endPosition.Y ||
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startPosition.Y == position.Y && startPosition.X <= position.X && (startPosition.Y != endPosition.Y || position.X <= endPosition.X) ||
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endPosition.Y == position.Y && startPosition.Y != endPosition.Y && position.X <= endPosition.X;
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}
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public bool ContainsOffset(int offset)
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{
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return Offset <= offset && offset <= EndOffset;
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}
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}
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}
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