Libation/Source/LibationAvalonia/Controls/WheelComboBox.axaml.cs

using Avalonia.Controls;
using Avalonia.Input;
using System;

namespace LibationAvalonia.Controls;

public partial class WheelComboBox : ComboBox
{
	protected override Type StyleKeyOverride => typeof(ComboBox);

	public WheelComboBox()
	{
		InitializeComponent();
	}
	protected override void OnPointerWheelChanged(PointerWheelEventArgs e)
	{
		var dir = Math.Sign(e.Delta.Y);
		if (dir == 1 && SelectedIndex > 0)
		{
			SelectedIndex--;
			e.Handled = true;
		}
		else if (dir == -1 && SelectedIndex < ItemCount - 1)
		{
			SelectedIndex++;
			e.Handled = true;
		}

		base.OnPointerWheelChanged(e);
	}
}