Как: Изменить направление потока содержимого программно

В этом примере показано, как программно изменить свойство FlowDirection свойства FlowDocumentReader.

Создание элементов кнопки

Создаются два Button элементов, каждый из которых представляет одно из возможных значений FlowDirection. При нажатии кнопки связанное значение свойства применяется к содержимому FlowDocumentReader с именем tf1. Значение свойства также записывается в TextBlock с именем txt1.

<StackPanel DockPanel.Dock="Top" Orientation="Horizontal" Margin="0,0,0,10">
  <Button Click="LR">LeftToRight</Button>
  <Button Click="RL">RightToLeft</Button>
</StackPanel>

<TextBlock Name="txt1" DockPanel.Dock="Bottom" Margin="0,50,0,0"/>

<FlowDocumentReader>
  <FlowDocument FontFamily="Arial" Name="tf1">
    <Paragraph>
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, 
    sed diam nonummy nibh euismod tincidunt ut laoreet dolore 
    magna aliquam erat volutpat.  Ut wisi enim ad minim veniam, 
    quis nostrud exerci tation ullamcorper suscipit lobortis nisl 
    ut aliquip ex ea commodo consequat. Duis autem vel eum iriure.
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    uliquip ex ea commodo consequat. Duis autem vel eum iriure. 
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    aliquip ex ea commodo consequat. Duis autem vel eum iriure.
    </Paragraph>
    <Paragraph>
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    aliquip ex ea commodo consequat. Duis autem vel eum iriure. 
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    aliquip ex ea commodo consequat. Duis autem vel eum iriure. 
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed 
    diam nonummy nibh euismod tincidunt ut laoreet dolore magna 
    aliquam erat volutpat.  Ut wisi enim ad minim veniam, quis 
    nostrud exerci tation ullamcorper suscipit lobortis nisl ut 
    aliquip ex ea commodo consequat. Duis autem vel eum iriure.
    </Paragraph>
  </FlowDocument>
</FlowDocumentReader>

Пример кода C#

События, связанные с нажатием кнопки, определенные выше, обрабатываются в файле кода C#.

private void LR(object sender, RoutedEventArgs e)
{
    tf1.FlowDirection = FlowDirection.LeftToRight;
    txt1.Text = "FlowDirection is now " + tf1.FlowDirection;
}
private void RL(object sender, RoutedEventArgs e)
{
    tf1.FlowDirection = FlowDirection.RightToLeft;
    txt1.Text = "FlowDirection is now " + tf1.FlowDirection;
}

Private Sub LR(ByVal sender As Object, ByVal e As RoutedEventArgs)
    tf1.FlowDirection = FlowDirection.LeftToRight
    txt1.Text = "FlowDirection is now " & tf1.FlowDirection
End Sub
Private Sub RL(ByVal sender As Object, ByVal e As RoutedEventArgs)
    tf1.FlowDirection = FlowDirection.RightToLeft
    txt1.Text = "FlowDirection is now " & tf1.FlowDirection
End Sub