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Viewing changes to src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/ExpressionHighlightRenderer.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/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/ExpressionHighlightRenderer.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.Diagnostics;
 
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using System.Windows.Media;
 
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using System.Collections.Generic;
 
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using ICSharpCode.AvalonEdit.Document;
 
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using ICSharpCode.AvalonEdit.Rendering;
 
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using ICSharpCode.SharpDevelop.Editor;
 
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using ICSharpCode.SharpDevelop.Refactoring;
 
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namespace ICSharpCode.AvalonEdit.AddIn
 
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{
 
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        /// <summary>
 
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        /// Highlights expressions (references to expression under current caret).
 
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        /// </summary>
 
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        public class ExpressionHighlightRenderer : IBackgroundRenderer
 
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        {
 
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                List<Reference> renderedReferences;
 
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                Pen borderPen;
 
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                Brush backgroundBrush;
 
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                TextView textView;
 
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                readonly Color borderColor = Color.FromArgb(52, 30, 130, 255);  //Color.FromArgb(180, 70, 230, 70))
 
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                readonly Color fillColor = Color.FromArgb(22, 30, 130, 255);    //Color.FromArgb(40, 60, 255, 60)
 
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                readonly int borderThickness = 1;
 
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                readonly int cornerRadius = 1;
 
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                public void SetHighlight(List<Reference> renderedReferences)
 
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                {
 
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                        if (this.renderedReferences != renderedReferences) {
 
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                                this.renderedReferences = renderedReferences;
 
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                                textView.InvalidateLayer(this.Layer);
 
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                        }
 
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                }
 
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                public void ClearHighlight()
 
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                {
 
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                        this.SetHighlight(null);
 
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                }
 
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                public ExpressionHighlightRenderer(TextView textView)
 
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                {
 
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                        if (textView == null)
 
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                                throw new ArgumentNullException("textView");
 
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                        this.textView = textView;
 
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                        this.borderPen = new Pen(new SolidColorBrush(borderColor), borderThickness);
 
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                        this.backgroundBrush = new SolidColorBrush(fillColor);
 
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                        this.borderPen.Freeze();
 
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                        this.backgroundBrush.Freeze();
 
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                        this.textView.BackgroundRenderers.Add(this);
 
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                }
 
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                public KnownLayer Layer {
 
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                        get {
 
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                                return KnownLayer.Selection;
 
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                        }
 
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                }
 
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                public void Draw(TextView textView, DrawingContext drawingContext)
 
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                {
 
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                        if (this.renderedReferences == null)
 
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                                return;
 
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                        BackgroundGeometryBuilder builder = new BackgroundGeometryBuilder();
 
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                        builder.CornerRadius = cornerRadius;
 
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                        builder.AlignToMiddleOfPixels = true;
 
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                        foreach (var reference in this.renderedReferences) {
 
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                                builder.AddSegment(textView, new TextSegment() { 
 
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                                                        StartOffset = reference.Offset, 
 
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                                                        Length = reference.Length });
 
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                                builder.CloseFigure();
 
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                        }
 
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                        Geometry geometry = builder.CreateGeometry();
 
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                        if (geometry != null) {
 
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                                drawingContext.DrawGeometry(backgroundBrush, borderPen, geometry);
 
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                        }
 
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                }
 
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        }
 
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}