/AvalonEdit/ICSharpCode.AvalonEdit/Editing/SelectionColorizer.cs
http://github.com/icsharpcode/ILSpy · C# · 74 lines · 48 code · 8 blank · 18 comment · 8 complexity · 7ba57bc4744381bddd77b6e8aafd460c MD5 · raw file
- // Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
- //
- // Permission is hereby granted, free of charge, to any person obtaining a copy of this
- // software and associated documentation files (the "Software"), to deal in the Software
- // without restriction, including without limitation the rights to use, copy, modify, merge,
- // publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
- // to whom the Software is furnished to do so, subject to the following conditions:
- //
- // The above copyright notice and this permission notice shall be included in all copies or
- // substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
- // INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
- // FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- // DEALINGS IN THE SOFTWARE.
- using System;
- using ICSharpCode.AvalonEdit.Rendering;
- #if NREFACTORY
- using ICSharpCode.NRefactory.Editor;
- #endif
- 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);
- });
- }
- }
- }
- }