source: branches/2929_PrioritizedGrammarEnumeration/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/ITextRunConstructionContext.cs @ 16147

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
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// 
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// substantial portions of the Software.
// 
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using System;
using System.Windows.Media.TextFormatting;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Utils;

namespace ICSharpCode.AvalonEdit.Rendering
{
  /// <summary>
  /// Contains information relevant for text run creation.
  /// </summary>
  public interface ITextRunConstructionContext
  {
    /// <summary>
    /// Gets the text document.
    /// </summary>
    TextDocument Document { get; }
    
    /// <summary>
    /// Gets the text view for which the construction runs.
    /// </summary>
    TextView TextView { get; }
    
    /// <summary>
    /// Gets the visual line that is currently being constructed.
    /// </summary>
    VisualLine VisualLine { get; }
    
    /// <summary>
    /// Gets the global text run properties.
    /// </summary>
    TextRunProperties GlobalTextRunProperties { get; }
    
    /// <summary>
    /// Gets a piece of text from the document.
    /// </summary>
    /// <remarks>
    /// This method is allowed to return a larger string than requested.
    /// It does this by returning a <see cref="StringSegment"/> that describes the requested segment within the returned string.
    /// This method should be the preferred text access method in the text transformation pipeline, as it can avoid repeatedly allocating string instances
    /// for text within the same line.
    /// </remarks>
    StringSegment GetText(int offset, int length);
  }
}