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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media;
namespace Juick.Controls
{
public class HyperLinkRichTextBox : RichTextBox
{
static readonly Regex UrlRegex = new Regex(@"http(s)?://([\w+?\.\w+])+([a-zA-Z0-9\~\!\@\#\$\%\^\&\*\(\)_\-\=\+\\\/\?\.\:\;\'\,]*)?", RegexOptions.Compiled);
// TODO: Add more entities
static readonly Regex JuickEntityRegex = new Regex(@"#(\d+)(/\d+)?", RegexOptions.Compiled);
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof(string), typeof(HyperLinkRichTextBox), new PropertyMetadata(default(string), TextPropertyChanged));
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
private static void TextPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var richTextBox = (HyperLinkRichTextBox)dependencyObject;
var stringValue = (string)dependencyPropertyChangedEventArgs.NewValue;
var paragraph = new Paragraph();
var index = 0;
foreach (var match in UrlRegex.Matches(stringValue).OfType<Match>().Union(JuickEntityRegex.Matches(stringValue).OfType<Match>()))
{
Uri uri = null;
if (!Uri.TryCreate(match.Value, UriKind.Absolute, out uri))
{
// Juick entity
uri = new Uri(string.Format("/ThreadView.xaml?mid={0}", JuickEntityRegex.Replace(match.Value, "$1")), UriKind.Relative);
}
if (match.Index > 0)
{
var length = match.Index - index;
if (length > 0)
{
paragraph.Inlines.Add(new Run { Text = stringValue.Substring(index, length) });
}
}
var hyperLink = new Hyperlink
{
NavigateUri = uri
};
if (uri.IsAbsoluteUri)
{
hyperLink.TargetName = "_blank";
hyperLink.Inlines.Add(uri.Host);
}
else
{
hyperLink.Inlines.Add(match.Value);
}
paragraph.Inlines.Add(hyperLink);
index = match.Index + match.Length;
}
if (index == 0 || index < stringValue.Length - 1)
{
var lastRunText = stringValue.Substring(index);
if (lastRunText.Length > 0)
{
paragraph.Inlines.Add(new Run { Text = lastRunText });
}
}
richTextBox.Blocks.Clear();
richTextBox.Blocks.Add(paragraph);
}
}
}
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