Scroll of RichTextBlock in windows 8 apps - windows

Question

I have a RichTextBlock in a ScrollViewer. The content of the RichTextBlock is very long. How can I scroll those text inside RichTextBlock?
I want to implement scrolling with in the Rich text Block as the text goes on appending with in the text block. Here the input has been given through a text box & those text of text box are appended into Rich Text block.
<Grid Background="{StaticResource
> ApplicationPageBackgroundThemeBrush}">
> <Grid.RowDefinitions>
> <RowDefinition Height="0.6*" />
> <RowDefinition Height="0.4*" />
> </Grid.RowDefinitions>
>
> <Grid Grid.Row="0"
> Width="1200"
> Height="350"
> Background="#FFFF">
> <ScrollViewer x:Name="scrollViewerChat"
> Width="1200"
> Height="350"
> HorizontalScrollBarVisibility="Disabled"
> HorizontalScrollMode="Disabled"
> VerticalScrollBarVisibility="Visible"
> VerticalScrollMode="Auto">
> <RichTextBlock x:Name="rchChatBlock"
> Grid.Row="0"
> Width="1200"
> Height="350"
> FontSize="40"
> Foreground="Black"
> ScrollViewer.VerticalScrollBarVisibility="Visible">
> <Paragraph x:Name="rchParagraph" ScrollViewer.VerticalScrollBarVisibility="Visible">
> <Run />
> </Paragraph>
> </RichTextBlock>
> </ScrollViewer>
> </Grid>
>
> <TextBox x:Name="txtBoxChat"
> Grid.Row="1"
> Width="1200"
> Height="100"
> FontSize="40"
> />
> <Button Grid.Row="1"
> Width="150"
> Height="50"
> HorizontalAlignment="Left
> VerticalAlignment="Bottom"
> Click="btnSend_Click"
> Content="Send" />
> </Grid>
>
>
>
>
> private void btnSend_Click(object sender, RoutedEventArgs e)
> {
> LoadData2();
> }
>
> private void LoadData2()
> {
> string input = txtBoxChat.Text;
> string pattern = " ";
> string[] substrings = Regex.Split(input, pattern);
> for (var i = 0; i < substrings.Length; i++)
> {
> var item = substrings[i];
> Run run1 = new Run();
> Run run2 = new Run();
> run1.Text = item;
> rchParagraph.Inlines.Add(run1);
>
> string k = " ";
> run2.Text = k;
> rchParagraph.Inlines.Add(run2);
>
> }
> Run run3 = new Run();
> run3.Text = "\n";
> rchParagraph.Inlines.Add(run3);
>
> }

Answer 1

I am not sure what event you want to use, but I'll let you decide. Then do this:
public void CauseScroll()
{
var box = new RichTextBlock();
var scroll = Children(box).First(x => x is ScrollViewer) as ScrollViewer;
scroll.ChangeView(null, scroll.ScrollableHeight, null);
}
public static IEnumerable<FrameworkElement> Children(FrameworkElement element)
{
Func<DependencyObject, List<FrameworkElement>> recurseChildren = null;
recurseChildren = (parent) =>
{
var list = new List<FrameworkElement>();
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
{
var child = VisualTreeHelper.GetChild(parent, i);
if (child is FrameworkElement)
list.Add(child as FrameworkElement);
list.AddRange(recurseChildren(child));
}
return list;
};
var children = recurseChildren(element);
return children;
}
That will scroll to the bottom.
Best of luck!