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52 lines
1.6 KiB
52 lines
1.6 KiB
// 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.Windows; |
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using System.Windows.Media; |
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using ICSharpCode.AvalonEdit.Rendering; |
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namespace ICSharpCode.AvalonEdit.Editing |
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{ |
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sealed class SelectionLayer : Layer, IWeakEventListener |
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{ |
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readonly TextArea textArea; |
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public SelectionLayer(TextArea textArea) : base(textArea.TextView, KnownLayer.Selection) |
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{ |
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this.IsHitTestVisible = false; |
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this.textArea = textArea; |
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TextViewWeakEventManager.VisualLinesChanged.AddListener(textView, this); |
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TextViewWeakEventManager.ScrollOffsetChanged.AddListener(textView, this); |
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} |
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bool IWeakEventListener.ReceiveWeakEvent(Type managerType, object sender, EventArgs e) |
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{ |
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if (managerType == typeof(TextViewWeakEventManager.VisualLinesChanged) |
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|| managerType == typeof(TextViewWeakEventManager.ScrollOffsetChanged)) |
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{ |
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InvalidateVisual(); |
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return true; |
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} |
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return false; |
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} |
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protected override void OnRender(DrawingContext drawingContext) |
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{ |
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base.OnRender(drawingContext); |
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BackgroundGeometryBuilder geoBuilder = new BackgroundGeometryBuilder(); |
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geoBuilder.AlignToMiddleOfPixels = true; |
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geoBuilder.CornerRadius = textArea.SelectionCornerRadius; |
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foreach (var segment in textArea.Selection.Segments) { |
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geoBuilder.AddSegment(textView, segment); |
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} |
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Geometry geometry = geoBuilder.CreateGeometry(); |
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if (geometry != null) { |
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drawingContext.DrawGeometry(textArea.SelectionBrush, textArea.SelectionBorder, geometry); |
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} |
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} |
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} |
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}
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