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Viewing changes to src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/SelectionColorizer.cs

  • Committer: sk
  • Date: 2011-09-10 05:17:57 UTC
  • Revision ID: halega@halega.com-20110910051757-qfouz1llya9m6boy
4.1.0.7915 Release Candidate 1

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src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/SelectionColorizer.cs
 
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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.Windows;
 
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using ICSharpCode.AvalonEdit.Document;
 
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using ICSharpCode.AvalonEdit.Rendering;
 
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namespace ICSharpCode.AvalonEdit.Editing
 
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{
 
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        sealed class SelectionColorizer : ColorizingTransformer
 
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        {
 
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                TextArea textArea;
 
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                public SelectionColorizer(TextArea textArea)
 
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                {
 
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                        if (textArea == null)
 
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                                throw new ArgumentNullException("textArea");
 
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                        this.textArea = textArea;
 
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                }
 
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                protected override void Colorize(ITextRunConstructionContext context)
 
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                {
 
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                        // if SelectionForeground is null, keep the existing foreground color
 
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                        if (textArea.SelectionForeground == null)
 
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                                return;
 
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                        int lineStartOffset = context.VisualLine.FirstDocumentLine.Offset;
 
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                        int lineEndOffset = context.VisualLine.LastDocumentLine.Offset + context.VisualLine.LastDocumentLine.TotalLength;
 
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                        foreach (ISegment segment in textArea.Selection.Segments) {
 
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                                int segmentStart = segment.Offset;
 
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                                int segmentEnd = segment.Offset + segment.Length;
 
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                                if (segmentEnd <= lineStartOffset)
 
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                                        continue;
 
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                                if (segmentStart >= lineEndOffset)
 
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                                        continue;
 
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                                int startColumn = context.VisualLine.GetVisualColumn(Math.Max(0, segmentStart - lineStartOffset));
 
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                                int endColumn = context.VisualLine.GetVisualColumn(segmentEnd - lineStartOffset);
 
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                                ChangeVisualElements(
 
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                                        startColumn, endColumn,
 
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                                        element => {
 
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                                                element.TextRunProperties.SetForegroundBrush(textArea.SelectionForeground);
 
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                                        });
 
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                        }
 
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                }
 
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        }
 
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}