/// <summary>
/// Fill flow document paragraph with syntax colored XAML.
/// </summary>
/// <param name="paragraph">paragraph to be filled</param>
/// <param name="xaml">xaml to colorize</param>
/// <param name="styles">styles used for syntax coloring</param>
public static void FillParagraph(this Paragraph paragraph, string xaml, XamlStyles styles)
{
using (var reader = new XmlTextReader(xaml, XmlNodeType.Document, null))
{
var indent = 0;
var tagOpened = false;
while (reader.Read())
{
if (reader.IsStartElement()) // opening tag, e.g. <Button
{
if (tagOpened)
{
// new line for child element
paragraph.Inlines.Add(new LineBreak());
}
// indentation
paragraph.AddRun(new string(' ', indent * 4), styles.TextStyle);
paragraph.AddRun("<", styles.DelimiterStyle);
paragraph.AddRun(reader.Name, styles.NameStyle);
if (reader.HasAttributes)
{
// write tag attributes
while (reader.MoveToNextAttribute())
{
paragraph.AddRun(" " + reader.Name, styles.AttributeStyle);
paragraph.AddRun("=", styles.DelimiterStyle);
paragraph.AddRun("\"", styles.QuotesStyle);
string value;
if (reader.Name == "TargetType") // target type fix - should use the Type MarkupExtension
{
value = "{x:Type " + reader.Value + "}";
}
else
{
value = reader.Value;
}
paragraph.AddAttributeValue(value, styles);
paragraph.AddRun("\"", styles.QuotesStyle);
}
reader.MoveToElement();
}
if (reader.IsEmptyElement) // empty tag, e.g. <Button />
{
paragraph.AddRun(" />", styles.DelimiterStyle);
paragraph.Inlines.Add(new LineBreak());
tagOpened = false;
--indent;
}
else // non-empty tag, e.g. <Button>
{
paragraph.AddRun(">", styles.DelimiterStyle);
tagOpened = true;
}
++indent;
}
else // closing tag, e.g. </Button>
{
--indent;
// text content of a tag, e.g. the text "Do This" in <Button>Do This</Button>
if (reader.NodeType == XmlNodeType.Text)
{
var content = reader.ReadContentAsString();
if (content.IndexOfAny(new[] { '\r', '\n' }) >= 0 && indent > 0)
{
// indentation
paragraph.AddRun(new string(' ', indent * 4), styles.TextStyle);
}
paragraph.AddRun(content, styles.TextStyle);
}
else if (indent > 0)
{
// indentation
paragraph.AddRun(new string(' ', indent * 4), styles.TextStyle);
}
paragraph.AddRun("</", styles.DelimiterStyle);
paragraph.AddRun(reader.Name, styles.NameStyle);
paragraph.AddRun(">", styles.DelimiterStyle);
paragraph.Inlines.Add(new LineBreak());
tagOpened = false;
}
}
}
}