WPF RichTextBox with no width set

wpf richtextbox
Michael picture Michael · Dec 8, 2008 · Viewed 12k times · Source

I have the following XAML code:

<Window x:Class="RichText_Wrapping.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1">
<Grid>
    <RichTextBox Height="100" Margin="2" Name="richTextBox1">
        <FlowDocument>
            <Paragraph>
                This is a RichTextBox - if you don't specify a width, the text appears in a single column
            </Paragraph>
        </FlowDocument>
    </RichTextBox>
</Grid>

... If you create this window in XAML, you can see that when you don't specify a width for the window, it wraps the text in a single column, one letter at a time. Is there something I'm missing? If it's a known deficiency in the control, is there any workaround?

Answer

lambinator picture lambinator · Apr 14, 2010

This is a confirmed bug with the WPF RichTextBox. To fix it, Bind the PageWidth of the FlowDocument to the RichTextBox width, i.e.

<RichTextBox Name="rtb">
    <FlowDocument Name="rtbFlowDoc" PageWidth="{Binding ElementName=rtb, Path=ActualWidth}" />
</RichTextBox>

EDIT: Give the FlowDocument a name so that you can access it in the code behind and never new the flow document in codebehind.

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