emby-toolbox/EmbyToolbox/Behaviors/AvalonEditTextBindingBehavior.cs

using System.Windows;
using ICSharpCode.AvalonEdit;

namespace EmbyToolbox.Behaviors;

public static class AvalonEditTextBindingBehavior
{
    public static readonly DependencyProperty BoundTextProperty =
        DependencyProperty.RegisterAttached(
            "BoundText",
            typeof(string),
            typeof(AvalonEditTextBindingBehavior),
            new PropertyMetadata(string.Empty, OnBoundTextChanged));

    public static string GetBoundText(DependencyObject obj)
    {
        return (string)obj.GetValue(BoundTextProperty);
    }

    public static void SetBoundText(DependencyObject obj, string value)
    {
        obj.SetValue(BoundTextProperty, value);
    }

    private static void OnBoundTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is not TextEditor editor)
        {
            return;
        }

        var nextText = e.NewValue as string ?? string.Empty;
        if (editor.Text == nextText)
        {
            return;
        }

        editor.Text = nextText;
    }
}