... finally I found the following solution. I created a inherited control from the original RichEditBox control with a DependencyProperty RtfText.
public class RichEditBoxExtended : RichEditBox
{
public static readonly DependencyProperty RtfTextProperty =
DependencyProperty.Register(
"RtfText", typeof (string), typeof (RichEditBoxExtended),
new PropertyMetadata(default(string), RtfTextPropertyChanged));
private bool _lockChangeExecution;
public RichEditBoxExtended()
{
TextChanged += RichEditBoxExtended_TextChanged;
}
public string RtfText
{
get { return (string) GetValue(RtfTextProperty); }
set { SetValue(RtfTextProperty, value); }
}
private void RichEditBoxExtended_TextChanged(object sender, RoutedEventArgs e)
{
if (!_lockChangeExecution)
{
_lockChangeExecution = true;
string text;
Document.GetText(TextGetOptions.None, out text);
if (string.IsNullOrWhiteSpace(text))
{
RtfText = "";
}
else
{
Document.GetText(TextGetOptions.FormatRtf, out text);
RtfText = text;
}
_lockChangeExecution = false;
}
}
private static void RtfTextPropertyChanged(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var rtb = dependencyObject as RichEditBoxExtended;
if (rtb == null) return;
if (!rtb._lockChangeExecution)
{
rtb._lockChangeExecution = true;
rtb.Document.SetText(TextSetOptions.FormatRtf, rtb.RtfText);
rtb._lockChangeExecution = false;
}
}
}
This solution works for me - perhaps for others too. :-)
Known issues: strange behaviours in VirtualizingStackPanel.VirtualizationMode="Recycling"
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