source: branches/Async/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Highlighting/RichTextModelWriter.cs @ 13508

// 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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// 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
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using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Media;
using ICSharpCode.NRefactory.Editor;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Utils;

namespace ICSharpCode.AvalonEdit.Highlighting
{
  /// <summary>
  /// A RichTextWriter that writes into a document and RichTextModel.
  /// </summary>
  class RichTextModelWriter : PlainRichTextWriter
  {
    readonly RichTextModel richTextModel;
    readonly DocumentTextWriter documentTextWriter;
    readonly Stack<HighlightingColor> colorStack = new Stack<HighlightingColor>();
    HighlightingColor currentColor;
    int currentColorBegin = -1;
    
    /// <summary>
    /// Creates a new RichTextModelWriter that inserts into document, starting at insertionOffset.
    /// </summary>
    public RichTextModelWriter(RichTextModel richTextModel, IDocument document, int insertionOffset)
      : base(new DocumentTextWriter(document, insertionOffset))
    {
      if (richTextModel == null)
        throw new ArgumentNullException("richTextModel");
      this.richTextModel = richTextModel;
      this.documentTextWriter = (DocumentTextWriter)base.textWriter;
      currentColor = richTextModel.GetHighlightingAt(Math.Max(0, insertionOffset - 1));
    }
    
    /// <summary>
    /// Gets/Sets the current insertion offset.
    /// </summary>
    public int InsertionOffset {
      get { return documentTextWriter.InsertionOffset; }
      set { documentTextWriter.InsertionOffset = value; }
    }
    
    
    /// <inheritdoc/>
    protected override void BeginUnhandledSpan()
    {
      colorStack.Push(currentColor);
    }
    
    void BeginColorSpan()
    {
      WriteIndentationIfNecessary();
      colorStack.Push(currentColor);
      currentColor = currentColor.Clone();
      currentColorBegin = documentTextWriter.InsertionOffset;
    }
    
    /// <inheritdoc/>
    public override void EndSpan()
    {
      currentColor = colorStack.Pop();
      currentColorBegin = documentTextWriter.InsertionOffset;
    }
    
    /// <inheritdoc/>
    protected override void AfterWrite()
    {
      base.AfterWrite();
      richTextModel.SetHighlighting(currentColorBegin, documentTextWriter.InsertionOffset - currentColorBegin, currentColor);
    }
    
    /// <inheritdoc/>
    public override void BeginSpan(Color foregroundColor)
    {
      BeginColorSpan();
      currentColor.Foreground = new SimpleHighlightingBrush(foregroundColor);
      currentColor.Freeze();
    }
    
    /// <inheritdoc/>
    public override void BeginSpan(FontFamily fontFamily)
    {
      BeginUnhandledSpan(); // TODO
    }
    
    /// <inheritdoc/>
    public override void BeginSpan(FontStyle fontStyle)
    {
      BeginColorSpan();
      currentColor.FontStyle = fontStyle;
      currentColor.Freeze();
    }
    
    /// <inheritdoc/>
    public override void BeginSpan(FontWeight fontWeight)
    {
      BeginColorSpan();
      currentColor.FontWeight = fontWeight;
      currentColor.Freeze();
    }
    
    /// <inheritdoc/>
    public override void BeginSpan(HighlightingColor highlightingColor)
    {
      BeginColorSpan();
      currentColor.MergeWith(highlightingColor);
      currentColor.Freeze();
    }
  }
}