54 lines
1.7 KiB
C#
54 lines
1.7 KiB
C#
// 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.ExtendToFullWidthAtLineEnd = textArea.Selection.EnableVirtualSpace;
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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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