feat: placeholder for touch screen editors

GSS2/TouchTextBox.cs

@@ -0,0 +1,20 @@
+using Avalonia.Controls;
+using Avalonia.Input;
+
+namespace GSS2;
+
+public class TouchTextBox : TextBox
+{
+    protected override Type StyleKeyOverride => typeof(TextBox);
+
+    public TouchTextBox()
+    : base()
+    {
+        AddHandler(PointerPressedEvent, OnPointerPressed, handledEventsToo: true);
+    }
+
+    private void OnPointerPressed(object? sender, PointerPressedEventArgs ea)
+    {
+        Console.WriteLine($"TODO: process TouchTextBox.PointerPressed event");
+    }
+}