using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Text.RegularExpressions;
using System.Windows.Media;
namespace NazarGrynko.UI.Controls
{
public class MyRichTextBox : RichTextBox
{
private const string UrlPattern = @"(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?";
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof (string), typeof(MyRichTextBox ), 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 = (MyRichTextBox)dependencyObject;
var text = (string) dependencyPropertyChangedEventArgs.NewValue;
int textPosition = 0;
var paragraph = new Paragraph();
var urlMatches = Regex.Matches(text, UrlPattern);
foreach (Match urlMatch in urlMatches)
{
int urlOccurrenceIndex = text.IndexOf(urlMatch.Value, textPosition, StringComparison.Ordinal);
if (urlOccurrenceIndex == 0)
{
var hyperlink = new Hyperlink
{
NavigateUri = new Uri(urlMatch.Value),
TargetName = "_blank",
Foreground = Application.Current.Resources["PhoneAccentBrush"] as Brush
};
hyperlink.Inlines.Add(urlMatch.Value);
paragraph.Inlines.Add(hyperlink);
textPosition += urlMatch.Value.Length;
}
else
{
paragraph.Inlines.Add(text.Substring(textPosition, urlOccurrenceIndex - textPosition));
textPosition += urlOccurrenceIndex - textPosition;
var hyperlink = new Hyperlink
{
NavigateUri = new Uri(urlMatch.Value),
TargetName = "_blank",
Foreground = Application.Current.Resources["PhoneAccentBrush"] as Brush
};
hyperlink.Inlines.Add(urlMatch.Value);
paragraph.Inlines.Add(hyperlink);
textPosition += urlMatch.Value.Length;
}
}
if (urlMatches.Count == 0)
{
paragraph.Inlines.Add(text);
}
richTextBox.Blocks.Add(paragraph);
}
}
}
Bind text with links to RichTextBox
我遇到自定义richtextbox(查找)的麻烦。当我加载我的20条消息(聊天系统)时,该元素被废话。它必须逐个采用绑定元素。但是对于聊天消息,该元素添加了其他旧消息。所以其他绑定数据再次绑定到新项目。我怎么能解决它?