Question

I need to show a really huge amount of text data in WPF code. First i tried to use TextBox (and of course it was too slow in rendering). Now i’m using FlowDocument–and its awesome–but recently i have had another request: text shouldnt be hyphenated. Supposedly it is not (document.IsHyphenationEnabled = false) but i still don’t see my precious horizontal scroll bar. if i magnify scale text is … hyphenated.

public string TextToShow
{
    set
    {
        Paragraph paragraph = new Paragraph();
        paragraph.Inlines.Add(value);

        FlowDocument document = new FlowDocument(paragraph);
        document.IsHyphenationEnabled = false;

        flowReader.Document = document;
        flowReader.IsScrollViewEnabled = true;
        flowReader.ViewingMode = FlowDocumentReaderViewingMode.Scroll;
        flowReader.IsPrintEnabled = true;
        flowReader.IsPageViewEnabled = false;
        flowReader.IsTwoPageViewEnabled = false;
    }
}

That’s how i create FlowDocument – and here comes part of my WPF control:

<FlowDocumentReader Name="flowReader" Margin="2 2 2 2" Grid.Row="0" />

Nothing criminal =))

I’d like to know how to tame this beast – googled nothing helpful. Or you have some alternative way to show megabytes of text, or textbox have some virtualization features which i need just to enable. Anyway i’ll be happy to hear your response!

Answer 1

It’s really wrapping not hyphenation. And one can overcome this by setting FlowDocument.PageWidth to reasonable value, the only question was how to determine this value.
Omer suggested this recipe msdn.itags.org/visual-studio/36912/ but i dont like using TextBlock as an measuring instrument for text. Much better way:

            Paragraph paragraph = new Paragraph();
            paragraph.Inlines.Add(value);


            FormattedText text = new FormattedText(value, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface(paragraph.FontFamily, paragraph.FontStyle, paragraph.FontWeight, paragraph.FontStretch), paragraph.FontSize, Brushes.Black );

            FlowDocument document = new FlowDocument(paragraph);
            document.PageWidth = text.Width*1.5;
            document.IsHyphenationEnabled = false;

Omer – thanks for the direction.