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source: trunk/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Editing/EmptySelection.cs @ 18242

Last change on this file since 18242 was 11700, checked in by jkarder, 10 years ago

#2077: created branch and added first version

File size: 3.3 KB
Line 
1// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
2//
3// Permission is hereby granted, free of charge, to any person obtaining a copy of this
4// software and associated documentation files (the "Software"), to deal in the Software
5// without restriction, including without limitation the rights to use, copy, modify, merge,
6// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
7// to whom the Software is furnished to do so, subject to the following conditions:
8//
9// The above copyright notice and this permission notice shall be included in all copies or
10// substantial portions of the Software.
11//
12// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
13// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
14// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
15// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
16// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
17// DEALINGS IN THE SOFTWARE.
18
19using System;
20using System.Collections.Generic;
21using System.Runtime.CompilerServices;
22
23using ICSharpCode.AvalonEdit.Document;
24using ICSharpCode.AvalonEdit.Utils;
25#if NREFACTORY
26using ICSharpCode.NRefactory;
27using ICSharpCode.NRefactory.Editor;
28#endif
29
30namespace ICSharpCode.AvalonEdit.Editing
31{
32  sealed class EmptySelection : Selection
33  {
34    public EmptySelection(TextArea textArea) : base(textArea)
35    {
36    }
37   
38    public override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
39    {
40      return this;
41    }
42   
43    public override TextViewPosition StartPosition {
44      get { return new TextViewPosition(TextLocation.Empty); }
45    }
46   
47    public override TextViewPosition EndPosition {
48      get { return new TextViewPosition(TextLocation.Empty); }
49    }
50   
51    public override ISegment SurroundingSegment {
52      get { return null; }
53    }
54   
55    public override Selection SetEndpoint(TextViewPosition endPosition)
56    {
57      throw new NotSupportedException();
58    }
59   
60    public override Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition)
61    {
62      var document = textArea.Document;
63      if (document == null)
64        throw ThrowUtil.NoDocumentAssigned();
65      return Create(textArea, startPosition, endPosition);
66    }
67   
68    public override IEnumerable<SelectionSegment> Segments {
69      get { return Empty<SelectionSegment>.Array; }
70    }
71   
72    public override string GetText()
73    {
74      return string.Empty;
75    }
76   
77    public override void ReplaceSelectionWithText(string newText)
78    {
79      if (newText == null)
80        throw new ArgumentNullException("newText");
81      newText = AddSpacesIfRequired(newText, textArea.Caret.Position, textArea.Caret.Position);
82      if (newText.Length > 0) {
83        if (textArea.ReadOnlySectionProvider.CanInsert(textArea.Caret.Offset)) {
84          textArea.Document.Insert(textArea.Caret.Offset, newText);
85        }
86      }
87      textArea.Caret.VisualColumn = -1;
88    }
89   
90    public override int Length {
91      get { return 0; }
92    }
93   
94    // Use reference equality because there's only one EmptySelection per text area.
95    public override int GetHashCode()
96    {
97      return RuntimeHelpers.GetHashCode(this);
98    }
99   
100    public override bool Equals(object obj)
101    {
102      return this == obj;
103    }
104  }
105}
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