how to scroll to bottom in Avaloniaui

Question

I have a textbox wrapped by a scrollviewer. Is there a way to automatically scroll down to the bottom when the text of the textbox changes? I hope don't violate the mvvm rules.

<ScrollViewer x:Name="LogSV" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
    <TextBox x:Name="LogText" Text="{Binding Log}" IsReadOnly="True" Focusable="False"/>
</ScrollViewer>

Answer 1

You could subscribe to the PropertyChanged event of the TextBox and change the scroll if the property name is Text.

private readonly ScrollViewer _scrollViewer;

public UserControl()
{
   InitializeComponent();
   this.FindControl<TextBox>("LogText").PropertyChanged += TextBoxPropertyChanged;
   _scrollViewer = this.FindControl<ScrollViewer>("LogSV");
}

private void TextBoxPropertyChanged(object? sender, AvaloniaPropertyChangedEventArgs e)
{
   if(e.Property.Name == "Text")
   {
      _scrollViewer.ScrollToEnd();
   }
}