WinWARP/WinWARP.Ui/Converters/BoolToVisibilityConverter.cs

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Data;
using Microsoft.UI.Xaml.Markup;

namespace WinWARP.Ui.Converters;

[MarkupExtensionReturnType(ReturnType = typeof(IValueConverter))]
public partial class BoolToVisibilityConverter : MarkupExtension, IValueConverter
{
    public bool IsInverted { get; set; } = false;

    // IValueConverter implementation
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        bool flag = false;
        if (value is bool boolValue)
        {
            flag = boolValue;
        }

        var parameterInverted = false;
        if (parameter is string paramStr && bool.TryParse(paramStr, out var result))
        {
            parameterInverted = result;
        }

        if (IsInverted || parameterInverted)
        {
            flag = !flag;
        }

        return flag ? Visibility.Visible : Visibility.Collapsed;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        if (value is Visibility visibility)
        {
            bool result = (visibility == Visibility.Visible);
            return IsInverted ? !result : result;
        }
        return false;
    }

    // MarkupExtension override returning self as the instance
    protected override object ProvideValue()
    {
        return this;
    }
}