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src/Artemis.UI.Shared/AttachedProperties/TextBoxAssist.cs

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+using System.Windows.Input;
+using Avalonia;
+using Avalonia.Controls;
+
+namespace Artemis.UI.Shared.AttachedProperties;
+
+/// <summary>
+///     Helper properties for working with TextBoxes.
+/// </summary>
+public class TextBoxAssist : AvaloniaObject
+{
+    /// <summary>
+    ///     Identifies the <seealso cref="SuffixTextProperty" /> Avalonia attached property.
+    /// </summary>
+    /// <value>Provide an <see cref="ICommand" /> derived object or binding.</value>
+    public static readonly AttachedProperty<string> SuffixTextProperty = AvaloniaProperty.RegisterAttached<TextBoxAssist, string>("SuffixText", typeof(TextBox));
+
+    /// <summary>
+    ///     Identifies the <seealso cref="PrefixTextProperty" /> Avalonia attached property.
+    /// </summary>
+    /// <value>Provide an <see cref="ICommand" /> derived object or binding.</value>
+    public static readonly AttachedProperty<string> PrefixTextProperty = AvaloniaProperty.RegisterAttached<TextBoxAssist, string>("PrefixText", typeof(TextBox));
+
+    /// <summary>
+    ///     Accessor for Attached property <see cref="SuffixTextProperty" />.
+    /// </summary>
+    public static void SetSuffixText(AvaloniaObject element, string value)
+    {
+        element.SetValue(SuffixTextProperty, value);
+
+        if (!string.IsNullOrWhiteSpace(value) && !((TextBox)element).Classes.Contains("suffixed"))
+            ((TextBox)element).Classes.Add("suffixed");
+        else
+            ((TextBox)element).Classes.Remove("suffixed");
+    }
+
+    /// <summary>
+    ///     Accessor for Attached property <see cref="SuffixTextProperty" />.
+    /// </summary>
+    public static string GetSuffixText(AvaloniaObject element)
+    {
+        return element.GetValue(SuffixTextProperty);
+    }
+
+    /// <summary>
+    ///     Accessor for Attached property <see cref="PrefixTextProperty" />.
+    /// </summary>
+    public static void SetPrefixText(AvaloniaObject element, string value)
+    {
+        element.SetValue(PrefixTextProperty, value);
+
+        if (!string.IsNullOrWhiteSpace(value) && !((TextBox)element).Classes.Contains("prefixed"))
+            ((TextBox)element).Classes.Add("prefixed");
+        else
+            ((TextBox)element).Classes.Remove("prefixed");
+    }
+
+    /// <summary>
+    ///     Accessor for Attached property <see cref="PrefixTextProperty" />.
+    /// </summary>
+    public static string GetPrefixText(AvaloniaObject element)
+    {
+        return element.GetValue(PrefixTextProperty);
+    }
+}