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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.Windows;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Rendering;
namespace ICSharpCode.AvalonEdit.Editing
{
sealed class SelectionColorizer : ColorizingTransformer
{
TextArea textArea;
public SelectionColorizer(TextArea textArea)
{
if (textArea == null)
throw new ArgumentNullException("textArea");
this.textArea = textArea;
}
protected override void Colorize(ITextRunConstructionContext context)
{
// if SelectionForeground is null, keep the existing foreground color
if (textArea.SelectionForeground == null)
return;
int lineStartOffset = context.VisualLine.FirstDocumentLine.Offset;
int lineEndOffset = context.VisualLine.LastDocumentLine.Offset + context.VisualLine.LastDocumentLine.TotalLength;
foreach (SelectionSegment segment in textArea.Selection.Segments) {
int segmentStart = segment.StartOffset;
int segmentEnd = segment.EndOffset;
if (segmentEnd <= lineStartOffset)
continue;
if (segmentStart >= lineEndOffset)
continue;
int startColumn;
if (segmentStart < lineStartOffset)
startColumn = 0;
else
startColumn = context.VisualLine.ValidateVisualColumn(segment.StartOffset, segment.StartVisualColumn, textArea.Selection.EnableVirtualSpace);
int endColumn;
if (segmentEnd > lineEndOffset)
endColumn = textArea.Selection.EnableVirtualSpace ? int.MaxValue : context.VisualLine.VisualLengthWithEndOfLineMarker;
else
endColumn = context.VisualLine.ValidateVisualColumn(segment.EndOffset, segment.EndVisualColumn, textArea.Selection.EnableVirtualSpace);
ChangeVisualElements(
startColumn, endColumn,
element => {
element.TextRunProperties.SetForegroundBrush(textArea.SelectionForeground);
});
}
}
}
}
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