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source: branches/ALPS/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/ColumnRulerRenderer.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: 2.7 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.Windows;
21using System.Windows.Media;
22
23using ICSharpCode.AvalonEdit.Rendering;
24using ICSharpCode.AvalonEdit.Utils;
25
26namespace ICSharpCode.AvalonEdit.Rendering
27{
28  /// <summary>
29  /// Renders a ruler at a certain column.
30  /// </summary>
31  sealed class ColumnRulerRenderer : IBackgroundRenderer
32  {
33    Pen pen;
34    int column;
35    TextView textView;
36   
37    public static readonly Color DefaultForeground = Colors.LightGray;
38   
39    public ColumnRulerRenderer(TextView textView)
40    {
41      if (textView == null)
42        throw new ArgumentNullException("textView");
43     
44      this.pen = new Pen(new SolidColorBrush(DefaultForeground), 1);
45      this.pen.Freeze();
46      this.textView = textView;
47      this.textView.BackgroundRenderers.Add(this);
48    }
49   
50    public KnownLayer Layer {
51      get { return KnownLayer.Background; }
52    }
53   
54    public void SetRuler(int column, Pen pen)
55    {
56      if (this.column != column) {
57        this.column = column;
58        textView.InvalidateLayer(this.Layer);
59      }
60      if (this.pen != pen) {
61        this.pen = pen;
62        textView.InvalidateLayer(this.Layer);
63      }
64    }
65   
66    public void Draw(TextView textView, System.Windows.Media.DrawingContext drawingContext)
67    {
68      if (column < 1) return;
69      double offset = textView.WideSpaceWidth * column;
70      Size pixelSize = PixelSnapHelpers.GetPixelSize(textView);
71      double markerXPos = PixelSnapHelpers.PixelAlign(offset, pixelSize.Width);
72      markerXPos -= textView.ScrollOffset.X;
73      Point start = new Point(markerXPos, 0);
74      Point end = new Point(markerXPos, Math.Max(textView.DocumentHeight, textView.ActualHeight));
75     
76      drawingContext.DrawLine(pen, start, end);
77    }
78  }
79}
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