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source: trunk/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Editing/SelectionLayer.cs @ 18242

Last change on this file since 18242 was 11700, checked in by jkarder, 10 years ago

#2077: created branch and added first version

File size: 2.6 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;
24
25namespace ICSharpCode.AvalonEdit.Editing
26{
27  sealed class SelectionLayer : Layer, IWeakEventListener
28  {
29    readonly TextArea textArea;
30   
31    public SelectionLayer(TextArea textArea) : base(textArea.TextView, KnownLayer.Selection)
32    {
33      this.IsHitTestVisible = false;
34     
35      this.textArea = textArea;
36      TextViewWeakEventManager.VisualLinesChanged.AddListener(textView, this);
37      TextViewWeakEventManager.ScrollOffsetChanged.AddListener(textView, this);
38    }
39   
40    bool IWeakEventListener.ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
41    {
42      if (managerType == typeof(TextViewWeakEventManager.VisualLinesChanged)
43          || managerType == typeof(TextViewWeakEventManager.ScrollOffsetChanged))
44      {
45        InvalidateVisual();
46        return true;
47      }
48      return false;
49    }
50   
51    protected override void OnRender(DrawingContext drawingContext)
52    {
53      base.OnRender(drawingContext);
54     
55      BackgroundGeometryBuilder geoBuilder = new BackgroundGeometryBuilder();
56      geoBuilder.AlignToMiddleOfPixels = true;
57      geoBuilder.ExtendToFullWidthAtLineEnd = textArea.Selection.EnableVirtualSpace;
58      geoBuilder.CornerRadius = textArea.SelectionCornerRadius;
59      foreach (var segment in textArea.Selection.Segments) {
60        geoBuilder.AddSegment(textView, segment);
61      }
62      Geometry geometry = geoBuilder.CreateGeometry();
63      if (geometry != null) {
64        drawingContext.DrawGeometry(textArea.SelectionBrush, textArea.SelectionBorder, geometry);
65      }
66    }
67  }
68}
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