86 lines
2.2 KiB
C#
86 lines
2.2 KiB
C#
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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using System.Collections.Generic;
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using System.Runtime.CompilerServices;
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using ICSharpCode.AvalonEdit.Document;
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using ICSharpCode.AvalonEdit.Utils;
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namespace ICSharpCode.AvalonEdit.Editing
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{
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sealed class EmptySelection : Selection
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{
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public EmptySelection(TextArea textArea) : base(textArea)
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{
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}
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public override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
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{
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return this;
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}
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public override TextViewPosition StartPosition {
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get { return new TextViewPosition(TextLocation.Empty); }
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}
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public override TextViewPosition EndPosition {
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get { return new TextViewPosition(TextLocation.Empty); }
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}
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public override ISegment SurroundingSegment {
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get { return null; }
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}
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public override Selection SetEndpoint(TextViewPosition endPosition)
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{
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throw new NotSupportedException();
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}
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public override Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition)
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{
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var document = textArea.Document;
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if (document == null)
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throw ThrowUtil.NoDocumentAssigned();
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return Create(textArea, startPosition, endPosition);
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}
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public override IEnumerable<SelectionSegment> Segments {
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get { return Empty<SelectionSegment>.Array; }
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}
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public override string GetText()
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{
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return string.Empty;
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}
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public override void ReplaceSelectionWithText(string newText)
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{
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if (newText == null)
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throw new ArgumentNullException("newText");
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newText = AddSpacesIfRequired(newText, textArea.Caret.Position, textArea.Caret.Position);
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if (newText.Length > 0) {
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if (textArea.ReadOnlySectionProvider.CanInsert(textArea.Caret.Offset)) {
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textArea.Document.Insert(textArea.Caret.Offset, newText);
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}
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}
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textArea.Caret.VisualColumn = -1;
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}
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public override int Length {
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get { return 0; }
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}
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// Use reference equality because there's only one EmptySelection per text area.
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public override int GetHashCode()
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{
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return RuntimeHelpers.GetHashCode(this);
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}
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public override bool Equals(object obj)
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{
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return this == obj;
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}
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}
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}
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