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/AvalonEdit/ICSharpCode.AvalonEdit/Rendering/VisualLineText.cs

http://github.com/icsharpcode/ILSpy
C# | 137 lines | 81 code | 16 blank | 40 comment | 14 complexity | 8ed6cbf551cea5b975299e7c8cb690b7 MD5 | raw file
  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.Collections.Generic;
 21using System.Windows.Documents;
 22using System.Windows.Media.TextFormatting;
 23
 24using ICSharpCode.AvalonEdit.Document;
 25using ICSharpCode.AvalonEdit.Utils;
 26
 27namespace ICSharpCode.AvalonEdit.Rendering
 28{
 29	/// <summary>
 30	/// VisualLineElement that represents a piece of text.
 31	/// </summary>
 32	public class VisualLineText : VisualLineElement
 33	{
 34		VisualLine parentVisualLine;
 35		
 36		/// <summary>
 37		/// Gets the parent visual line.
 38		/// </summary>
 39		public VisualLine ParentVisualLine {
 40			get { return parentVisualLine; }
 41		}
 42		
 43		/// <summary>
 44		/// Creates a visual line text element with the specified length.
 45		/// It uses the <see cref="ITextRunConstructionContext.VisualLine"/> and its
 46		/// <see cref="VisualLineElement.RelativeTextOffset"/> to find the actual text string.
 47		/// </summary>
 48		public VisualLineText(VisualLine parentVisualLine, int length) : base(length, length)
 49		{
 50			if (parentVisualLine == null)
 51				throw new ArgumentNullException("parentVisualLine");
 52			this.parentVisualLine = parentVisualLine;
 53		}
 54		
 55		/// <summary>
 56		/// Override this method to control the type of new VisualLineText instances when
 57		/// the visual line is split due to syntax highlighting.
 58		/// </summary>
 59		protected virtual VisualLineText CreateInstance(int length)
 60		{
 61			return new VisualLineText(parentVisualLine, length);
 62		}
 63		
 64		/// <inheritdoc/>
 65		public override TextRun CreateTextRun(int startVisualColumn, ITextRunConstructionContext context)
 66		{
 67			if (context == null)
 68				throw new ArgumentNullException("context");
 69			
 70			int relativeOffset = startVisualColumn - VisualColumn;
 71			StringSegment text = context.GetText(context.VisualLine.FirstDocumentLine.Offset + RelativeTextOffset + relativeOffset, DocumentLength - relativeOffset);
 72			return new TextCharacters(text.Text, text.Offset, text.Count, this.TextRunProperties);
 73		}
 74		
 75		/// <inheritdoc/>
 76		public override bool IsWhitespace(int visualColumn)
 77		{
 78			int offset = visualColumn - this.VisualColumn + parentVisualLine.FirstDocumentLine.Offset + this.RelativeTextOffset;
 79			return char.IsWhiteSpace(parentVisualLine.Document.GetCharAt(offset));
 80		}
 81		
 82		/// <inheritdoc/>
 83		public override TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(int visualColumnLimit, ITextRunConstructionContext context)
 84		{
 85			if (context == null)
 86				throw new ArgumentNullException("context");
 87			
 88			int relativeOffset = visualColumnLimit - VisualColumn;
 89			StringSegment text = context.GetText(context.VisualLine.FirstDocumentLine.Offset + RelativeTextOffset, relativeOffset);
 90			CharacterBufferRange range = new CharacterBufferRange(text.Text, text.Offset, text.Count);
 91			return new TextSpan<CultureSpecificCharacterBufferRange>(range.Length, new CultureSpecificCharacterBufferRange(this.TextRunProperties.CultureInfo, range));
 92		}
 93		
 94		/// <inheritdoc/>
 95		public override bool CanSplit {
 96			get { return true; }
 97		}
 98		
 99		/// <inheritdoc/>
100		public override void Split(int splitVisualColumn, IList<VisualLineElement> elements, int elementIndex)
101		{
102			if (splitVisualColumn <= VisualColumn || splitVisualColumn >= VisualColumn + VisualLength)
103				throw new ArgumentOutOfRangeException("splitVisualColumn", splitVisualColumn, "Value must be between " + (VisualColumn + 1) + " and " + (VisualColumn + VisualLength - 1));
104			if (elements == null)
105				throw new ArgumentNullException("elements");
106			if (elements[elementIndex] != this)
107				throw new ArgumentException("Invalid elementIndex - couldn't find this element at the index");
108			int relativeSplitPos = splitVisualColumn - VisualColumn;
109			VisualLineText splitPart = CreateInstance(DocumentLength - relativeSplitPos);
110			SplitHelper(this, splitPart, splitVisualColumn, relativeSplitPos + RelativeTextOffset);
111			elements.Insert(elementIndex + 1, splitPart);
112		}
113		
114		/// <inheritdoc/>
115		public override int GetRelativeOffset(int visualColumn)
116		{
117			return this.RelativeTextOffset + visualColumn - this.VisualColumn;
118		}
119		
120		/// <inheritdoc/>
121		public override int GetVisualColumn(int relativeTextOffset)
122		{
123			return this.VisualColumn + relativeTextOffset - this.RelativeTextOffset;
124		}
125		
126		/// <inheritdoc/>
127		public override int GetNextCaretPosition(int visualColumn, LogicalDirection direction, CaretPositioningMode mode)
128		{
129			int textOffset = parentVisualLine.StartOffset + this.RelativeTextOffset;
130			int pos = TextUtilities.GetNextCaretPosition(parentVisualLine.Document, textOffset + visualColumn - this.VisualColumn, direction, mode);
131			if (pos < textOffset || pos > textOffset + this.DocumentLength)
132				return -1;
133			else
134				return this.VisualColumn + pos - textOffset;
135		}
136	}
137}