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source: branches/ALPS/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/TextViewCachedElements.cs @ 12048

Last change on this file since 12048 was 11700, checked in by jkarder, 10 years ago

#2077: created branch and added first version

File size: 2.4 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.Windows.Media;
22using System.Windows.Media.TextFormatting;
23using ICSharpCode.AvalonEdit.Utils;
24
25namespace ICSharpCode.AvalonEdit.Rendering
26{
27  sealed class TextViewCachedElements : IDisposable
28  {
29    TextFormatter formatter;
30    Dictionary<string, TextLine> nonPrintableCharacterTexts;
31   
32    public TextLine GetTextForNonPrintableCharacter(string text, ITextRunConstructionContext context)
33    {
34      if (nonPrintableCharacterTexts == null)
35        nonPrintableCharacterTexts = new Dictionary<string, TextLine>();
36      TextLine textLine;
37      if (!nonPrintableCharacterTexts.TryGetValue(text, out textLine)) {
38        var p = new VisualLineElementTextRunProperties(context.GlobalTextRunProperties);
39        p.SetForegroundBrush(context.TextView.NonPrintableCharacterBrush);
40        if (formatter == null)
41          formatter = TextFormatterFactory.Create(context.TextView);
42        textLine = FormattedTextElement.PrepareText(formatter, text, p);
43        nonPrintableCharacterTexts[text] = textLine;
44      }
45      return textLine;
46    }
47   
48    public void Dispose()
49    {
50      if (nonPrintableCharacterTexts != null) {
51        foreach (TextLine line in nonPrintableCharacterTexts.Values)
52          line.Dispose();
53      }
54      if (formatter != null)
55        formatter.Dispose();
56    }
57  }
58}
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