source: trunk/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/ITextRunConstructionContext.cs @ 17530

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
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// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// 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);
  }
}