Billing/Billing.Shared/UI/Definition.cs

using System;
using Xamarin.Forms;

namespace Billing.UI;

public static partial class Definition
{
    public static partial string GetCascadiaRegularFontFamily();
    public static partial string GetCascadiaBoldFontFamily();
    public static partial string GetRobotoCondensedRegularFontFamily();
    public static partial string GetRobotoCondensedBoldFontFamily();
}

public static class ExtensionHelper
{
    public static View Binding(this View view, BindableProperty property, string path, BindingMode mode = BindingMode.Default, IValueConverter converter = null)
    {
        view.SetBinding(property, path, mode, converter);
        return view;
    }

    public static View DynamicResource(this View view, BindableProperty property, string key)
    {
        view.SetDynamicResource(property, key);
        return view;
    }

    public static View GridColumn(this View view, int column)
    {
        Grid.SetColumn(view, column);
        return view;
    }

    public static View GridRow(this View view, int row)
    {
        Grid.SetRow(view, row);
        return view;
    }
}

public class Tap : IDisposable
{
    private readonly static object sync = new();
    private static Tap instance;

    private bool busy = false;

    private Tap() { }

    public static bool IsBusy => instance?.busy ?? false;

    public static Tap Start()
    {
        lock (sync)
        {
            (instance ??= new Tap()).busy = true;
        }
        return instance;
    }

    public void Dispose()
    {
        lock (sync)
        {
            busy = false;
        }
    }
}