source: tags/3.3.11/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Highlighting/RichTextColorizer.cs @ 12011

// 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
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// 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
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Rendering;

namespace ICSharpCode.AvalonEdit.Highlighting
{
  /// <summary>
  /// A colorizer that applies the highlighting from a <see cref="RichTextModel"/> to the editor.
  /// </summary>
  public class RichTextColorizer : DocumentColorizingTransformer
  {
    readonly RichTextModel richTextModel;
    
    /// <summary>
    /// Creates a new RichTextColorizer instance.
    /// </summary>
    public RichTextColorizer(RichTextModel richTextModel)
    {
      if (richTextModel == null)
        throw new ArgumentNullException("richTextModel");
      this.richTextModel = richTextModel;
    }
    
    /// <inheritdoc/>
    protected override void ColorizeLine(DocumentLine line)
    {
      var sections = richTextModel.GetHighlightedSections(line.Offset, line.Length);
      foreach (HighlightedSection section in sections) {
        if (HighlightingColorizer.IsEmptyColor(section.Color))
          continue;
        ChangeLinePart(section.Offset, section.Offset + section.Length,
                       visualLineElement => HighlightingColorizer.ApplyColorToElement(visualLineElement, section.Color, CurrentContext));
      }
    }
  }
}