From 080f1697e97e13461ec6df4d31c8924d01257a1b Mon Sep 17 00:00:00 2001
From: Roy Ben Shabat <Roy.mail.net@gmail.com>
Date: Tue, 9 Apr 2019 01:47:48 +0300
Subject: MERGE

---
 .../Rendering/VisualLineText.cs                    | 122 +++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineText.cs

(limited to 'Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineText.cs')

diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineText.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineText.cs
new file mode 100644
index 000000000..85b0a9ac4
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/VisualLineText.cs
@@ -0,0 +1,122 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections.Generic;
+using System.Windows.Documents;
+using System.Windows.Media.TextFormatting;
+
+using Tango.Scripting.Editors.Document;
+using Tango.Scripting.Editors.Utils;
+
+namespace Tango.Scripting.Editors.Rendering
+{
+	/// <summary>
+	/// VisualLineElement that represents a piece of text.
+	/// </summary>
+	public class VisualLineText : VisualLineElement
+	{
+		VisualLine parentVisualLine;
+		
+		/// <summary>
+		/// Gets the parent visual line.
+		/// </summary>
+		public VisualLine ParentVisualLine {
+			get { return parentVisualLine; }
+		}
+		
+		/// <summary>
+		/// Creates a visual line text element with the specified length.
+		/// It uses the <see cref="ITextRunConstructionContext.VisualLine"/> and its
+		/// <see cref="VisualLineElement.RelativeTextOffset"/> to find the actual text string.
+		/// </summary>
+		public VisualLineText(VisualLine parentVisualLine, int length) : base(length, length)
+		{
+			if (parentVisualLine == null)
+				throw new ArgumentNullException("parentVisualLine");
+			this.parentVisualLine = parentVisualLine;
+		}
+		
+		/// <summary>
+		/// Override this method to control the type of new VisualLineText instances when
+		/// the visual line is split due to syntax highlighting.
+		/// </summary>
+		protected virtual VisualLineText CreateInstance(int length)
+		{
+			return new VisualLineText(parentVisualLine, length);
+		}
+		
+		/// <inheritdoc/>
+		public override TextRun CreateTextRun(int startVisualColumn, ITextRunConstructionContext context)
+		{
+			if (context == null)
+				throw new ArgumentNullException("context");
+			
+			int relativeOffset = startVisualColumn - VisualColumn;
+			StringSegment text = context.GetText(context.VisualLine.FirstDocumentLine.Offset + RelativeTextOffset + relativeOffset, DocumentLength - relativeOffset);
+			return new TextCharacters(text.Text, text.Offset, text.Count, this.TextRunProperties);
+		}
+		
+		/// <inheritdoc/>
+		public override bool IsWhitespace(int visualColumn)
+		{
+			int offset = visualColumn - this.VisualColumn + parentVisualLine.FirstDocumentLine.Offset + this.RelativeTextOffset;
+			return char.IsWhiteSpace(parentVisualLine.Document.GetCharAt(offset));
+		}
+		
+		/// <inheritdoc/>
+		public override TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(int visualColumnLimit, ITextRunConstructionContext context)
+		{
+			if (context == null)
+				throw new ArgumentNullException("context");
+			
+			int relativeOffset = visualColumnLimit - VisualColumn;
+			StringSegment text = context.GetText(context.VisualLine.FirstDocumentLine.Offset + RelativeTextOffset, relativeOffset);
+			CharacterBufferRange range = new CharacterBufferRange(text.Text, text.Offset, text.Count);
+			return new TextSpan<CultureSpecificCharacterBufferRange>(range.Length, new CultureSpecificCharacterBufferRange(this.TextRunProperties.CultureInfo, range));
+		}
+		
+		/// <inheritdoc/>
+		public override bool CanSplit {
+			get { return true; }
+		}
+		
+		/// <inheritdoc/>
+		public override void Split(int splitVisualColumn, IList<VisualLineElement> elements, int elementIndex)
+		{
+			if (splitVisualColumn <= VisualColumn || splitVisualColumn >= VisualColumn + VisualLength)
+				throw new ArgumentOutOfRangeException("splitVisualColumn", splitVisualColumn, "Value must be between " + (VisualColumn + 1) + " and " + (VisualColumn + VisualLength - 1));
+			if (elements == null)
+				throw new ArgumentNullException("elements");
+			if (elements[elementIndex] != this)
+				throw new ArgumentException("Invalid elementIndex - couldn't find this element at the index");
+			int relativeSplitPos = splitVisualColumn - VisualColumn;
+			VisualLineText splitPart = CreateInstance(DocumentLength - relativeSplitPos);
+			SplitHelper(this, splitPart, splitVisualColumn, relativeSplitPos + RelativeTextOffset);
+			elements.Insert(elementIndex + 1, splitPart);
+		}
+		
+		/// <inheritdoc/>
+		public override int GetRelativeOffset(int visualColumn)
+		{
+			return this.RelativeTextOffset + visualColumn - this.VisualColumn;
+		}
+		
+		/// <inheritdoc/>
+		public override int GetVisualColumn(int relativeTextOffset)
+		{
+			return this.VisualColumn + relativeTextOffset - this.RelativeTextOffset;
+		}
+		
+		/// <inheritdoc/>
+		public override int GetNextCaretPosition(int visualColumn, LogicalDirection direction, CaretPositioningMode mode)
+		{
+			int textOffset = parentVisualLine.StartOffset + this.RelativeTextOffset;
+			int pos = TextUtilities.GetNextCaretPosition(parentVisualLine.Document, textOffset + visualColumn - this.VisualColumn, direction, mode);
+			if (pos < textOffset || pos > textOffset + this.DocumentLength)
+				return -1;
+			else
+				return this.VisualColumn + pos - textOffset;
+		}
+	}
+}
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