using System.Globalization;
using System.Windows.Data;

namespace Melskin.Converters.Internal;

/// <summary>
/// 隔行交错背景颜色
/// </summary>
[ValueConversion(typeof(int), typeof(Visibility))]
public class InterlacedBackgroundConverter : IValueConverter
{
    /// <summary>
    /// InterlacedBackgroundConverter 的单例实例，用于提供隔行交错背景颜色的转换功能。
    /// 该实例可以直接在XAML中通过静态资源引用，以便为列表项等控件设置交替背景颜色。
    /// </summary>
    public static readonly InterlacedBackgroundConverter Instance = new();

    /// <inheritdoc />
    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        var line = (int)(value ?? throw new ArgumentNullException(nameof(value)));
        return line % 2 == 0 ? Visibility.Collapsed : Visibility.Visible;
    }

    /// <inheritdoc />
    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        return Binding.DoNothing;
    }
}