C#/WPF：禁用 RichTextBox 的文本换行

Question

Does anyone know how I can disable the text wrapping of a RichTextBox ? Eg if I have a large string which doesn't fit in the window, the RichTextBox places the part of the string which can't be shown of a new line. I want to disable that (and make it visible only by using the Scrollbar ).

Thanks a lot.

Cheers

Answer 1

A RichTextBox in WPF is simply an editor for a FlowDocument .
According to MSDN :

Text always wraps in a RichTextBox . If you do not want text to wrap then set the PageWidth on the FlowDocument to be larger than the width of the RichTextBox . However, once the page width is reached the text still wraps.

So, while there's no way for you to explicitly disable the word-wrapping of a RichTextBox , you can do something like this:

richTextBox1.HorizontalScrollBarVisibility = ScrollBarVisibility.Visible;
richTextBox1.Document.PageWidth = 1000;

Which will have essentially the same desired effect until you have a line that exceeds the PageWidth .

Note (as of July 2015): VS2015 RC allows wordwrap = false to work precisely as OP seems to desire. I believe earlier versions of Visual Studio did also.

Answer 2

If you don't want to show the horizontal scrollbar, enforce a MinWidth on the ScrollViewer:

<RichTextBox ScrollViewer.HorizontalScrollBarVisibility="Hidden">

    <RichTextBox.Resources>
        <Style TargetType="ScrollViewer">
            <Setter Property="MinWidth" Value="2000" />
        </Style>
    </RichTextBox.Resources>

</RichTextBox>

Answer 3

Since no answer was satisfying for me, here is my solution:

private void RichTxt_TextChanged(object sender, TextChangedEventArgs e)
{
    string text = new TextRange(richTxt.Document.ContentStart, richTxt.Document.ContentEnd).Text;
    FormattedText ft = new FormattedText(text, System.Globalization.CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface(richTxt.FontFamily, richTxt.FontStyle, richTxt.FontWeight, richTxt.FontStretch), richTxt.FontSize, Brushes.Black);
    richTxt.Document.PageWidth = ft.Width + 12;
    richTxt.HorizontalScrollBarVisibility = (richTxt.Width < ft.Width + 12) ? ScrollBarVisibility.Visible : ScrollBarVisibility.Hidden;
}

Question is about performance depending on text length and how often it is refreshed.

Answer 4

I also needed to display a large string and tried the RichTextBox but I did not like the solution with setting the PageWidth of the Document to a fixed size. The scrollbar would be visible all the time and the scrolling area was be to big.

If a TextBlock is sufficient you can use that instead and place it inside a ScrollViewer. It worked perfect for me since I did not need all the extra features of the RichTextBox.

<ScrollViewer Width="200"
              Height="100"
              HorizontalScrollBarVisibility="Auto"
              VerticalScrollBarVisibility="Auto">
                  <TextBlock TextWrapping="NoWrap">
                      <TextBlock.Text>
                          Very long text Very long text Very long text 
                      </TextBlock.Text>
                  </TextBlock>
</ScrollViewer>

Answer 5

VerticalScrollBar :

VerticalScrollBarVisibility="Auto" MaxHeight="200"

HorizontalScrollBar :

HorizontalScrollBarVisibility="Auto" MaxWidth="400"

Answer 6

Suitable solution for me. The idea was taken from here. I defined in XAML

            <RichTextBox x:Name="PART_rtb" VerticalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Auto" TextChanged="MyRichTextBox_OnTextChanged">
                <RichTextBox.Document>
                    <FlowDocument x:Name="PART_fd"  >
                        <FlowDocument.Resources>
                            <!--This style is used to set the margins for all paragraphs in the FlowDocument to 0.-->
                            <Style TargetType="{x:Type Paragraph}">
                                <Setter Property="Margin" Value="3"/>

                            </Style>
                        </FlowDocument.Resources>
                    </FlowDocument>
                </RichTextBox.Document>
            </RichTextBox>

In Code

   private void MyRichTextBox_OnTextChanged(object sender, TextChangedEventArgs e)
    {
        double i  = PART_rtb.Document.GetFormattedText().WidthIncludingTrailingWhitespace + 20;
        (sender as RichTextBox).Document.PageWidth = i;
    }