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// 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.Runtime.CompilerServices;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Utils;
namespace ICSharpCode.AvalonEdit.Editing
{
sealed class EmptySelection : Selection
{
public EmptySelection(TextArea textArea) : base(textArea)
{
}
public override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
{
return this;
}
public override TextViewPosition StartPosition {
get { return new TextViewPosition(TextLocation.Empty); }
}
public override TextViewPosition EndPosition {
get { return new TextViewPosition(TextLocation.Empty); }
}
public override ISegment SurroundingSegment {
get { return null; }
}
public override Selection SetEndpoint(TextViewPosition endPosition)
{
throw new NotSupportedException();
}
public override Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition)
{
var document = textArea.Document;
if (document == null)
throw ThrowUtil.NoDocumentAssigned();
return Create(textArea, startPosition, endPosition);
}
public override IEnumerable<SelectionSegment> Segments {
get { return Empty<SelectionSegment>.Array; }
}
public override string GetText()
{
return string.Empty;
}
public override void ReplaceSelectionWithText(string newText)
{
if (newText == null)
throw new ArgumentNullException("newText");
newText = AddSpacesIfRequired(newText, textArea.Caret.Position, textArea.Caret.Position);
if (newText.Length > 0) {
if (textArea.ReadOnlySectionProvider.CanInsert(textArea.Caret.Offset)) {
textArea.Document.Insert(textArea.Caret.Offset, newText);
}
}
textArea.Caret.VisualColumn = -1;
}
public override int Length {
get { return 0; }
}
// Use reference equality because there's only one EmptySelection per text area.
public override int GetHashCode()
{
return RuntimeHelpers.GetHashCode(this);
}
public override bool Equals(object obj)
{
return this == obj;
}
}
}
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