public DialogHyperlink(RichTextBox textBox)
{
this.textBox = textBox;
Hyperlink link = DialogHyperlink.SelectedHyperlink(this.textBox);
if (link != null)
{
TextRange range = new TextRange(link.ContentStart, link.ContentEnd);
this.HyperlinkText = range.Text;
this.HyperlinkUrl = link.NavigateUri.ToString();
textBox.Selection.Select(link.ElementStart, link.ElementEnd);
}
else
{
this.HyperlinkText = this.textBox.Selection.Text;
string text = this.HyperlinkText.Trim();
if (DialogHyperlink.IsUrl(text))
{
this.HyperlinkUrl = text;
}
else
{
this.HyperlinkUrl = string.Empty;
}
}
this.DataContext = this;
this.InitializeComponent();
}
private static Hyperlink SelectedHyperlink(RichTextBox textBox)
{
if (textBox.Selection.IsEmpty)
{
return(DialogHyperlink.SelectedHyperlink(textBox.Selection.Start));
}
else
{
Hyperlink h1 = DialogHyperlink.SelectedHyperlink(textBox.Selection.Start);
Hyperlink h2 = DialogHyperlink.SelectedHyperlink(textBox.Selection.End);
if (h1 == h2 && h1 != null)
{
return(h1);
}
if (h1 != null)
{
return(h1);
}
if (h2 != null)
{
return(h2);
}
h1 = DialogHyperlink.FindHyperlink(textBox.Selection.Start, LogicalDirection.Forward);
h2 = DialogHyperlink.FindHyperlink(textBox.Selection.End, LogicalDirection.Backward);
if (h1 == h2)
{
return(h1);
}
}
return(null);
}
private static Hyperlink FindHyperlink(TextPointer textPointer, LogicalDirection logicalDirection)
{
TextPointer tp = textPointer.GetNextInsertionPosition(logicalDirection);
if (tp != null)
{
return(DialogHyperlink.SelectedHyperlink(tp));
}
return(null);
}
