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// 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.IO;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Rendering;
namespace $rootnamespace$.AvalonEdit.Sample
{
/// <summary>
/// This class can be used to embed images inside AvalonEdit like this: <img src="Images/Save.png"/>
/// </summary>
public class ImageElementGenerator : VisualLineElementGenerator
{
readonly static Regex imageRegex = new Regex(@"<img src=""([\.\/\w\d]+)""/?>",
RegexOptions.IgnoreCase);
readonly string basePath;
public ImageElementGenerator(string basePath)
{
if (basePath == null)
throw new ArgumentNullException("basePath");
this.basePath = basePath;
}
Match FindMatch(int startOffset)
{
// fetch the end offset of the VisualLine being generated
int endOffset = CurrentContext.VisualLine.LastDocumentLine.EndOffset;
TextDocument document = CurrentContext.Document;
string relevantText = document.GetText(startOffset, endOffset - startOffset);
return imageRegex.Match(relevantText);
}
/// <summary>
/// Gets the first offset >= startOffset where the generator wants to construct
/// an element.
/// Return -1 to signal no interest.
/// </summary>
public override int GetFirstInterestedOffset(int startOffset)
{
Match m = FindMatch(startOffset);
return m.Success ? (startOffset + m.Index) : -1;
}
/// <summary>
/// Constructs an element at the specified offset.
/// May return null if no element should be constructed.
/// </summary>
public override VisualLineElement ConstructElement(int offset)
{
Match m = FindMatch(offset);
// check whether there's a match exactly at offset
if (m.Success && m.Index == 0) {
BitmapImage bitmap = LoadBitmap(m.Groups[1].Value);
if (bitmap != null) {
Image image = new Image();
image.Source = bitmap;
image.Width = bitmap.PixelWidth;
image.Height = bitmap.PixelHeight;
// Pass the length of the match to the 'documentLength' parameter
// of InlineObjectElement.
return new InlineObjectElement(m.Length, image);
}
}
return null;
}
BitmapImage LoadBitmap(string fileName)
{
// TODO: add some kind of cache to avoid reloading the image whenever the
// VisualLine is reconstructed
try {
string fullFileName = Path.Combine(basePath, fileName);
if (File.Exists(fullFileName)) {
BitmapImage bitmap = new BitmapImage(new Uri(fullFileName));
bitmap.Freeze();
return bitmap;
}
} catch (ArgumentException) {
// invalid filename syntax
} catch (IOException) {
// other IO error
}
return null;
}
}
}
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