// Copyright (c) 2009 Daniel Grunwald
// 
// 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 System.Windows;
using System.Windows.Media;

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

namespace AvalonEdit.Sample
{
	/// <summary>
	/// Finds the word 'AvalonEdit' and makes it bold and italic.
	/// </summary>
	public class ColorizeAvalonEdit : DocumentColorizingTransformer
	{
		protected override void ColorizeLine(DocumentLine line)
		{
			int lineStartOffset = line.Offset;
			string text = CurrentContext.Document.GetText(line);
			int start = 0;
			int index;
			while ((index = text.IndexOf("AvalonEdit", start)) >= 0) {
				base.ChangeLinePart(
					lineStartOffset + index, // startOffset
					lineStartOffset + index + 10, // endOffset
					(VisualLineElement element) => {
						// This lambda gets called once for every VisualLineElement
						// between the specified offsets.
						Typeface tf = element.TextRunProperties.Typeface;
						// Replace the typeface with a modified version of
						// the same typeface
						element.TextRunProperties.SetTypeface(new Typeface(
							tf.FontFamily,
							FontStyles.Italic,
							FontWeights.Bold,
							tf.Stretch
						));
					});
				start = index + 1; // search for next occurrence
			}
		}
	}
}