Xamarin Forms get absolute bounds of a control and display a menu at this location

IScreenLocation.cs

namespace Vapolia
{
  public interface IScreenLocation
  {
      PointF GetCoordinates(VisualElement view);
  }
}

sample.viewmodel.cs

//using Vapolia.UserInteraction

public ICommand OpenMenuCommand => MakeCommand<VisualElement>(async sourceView =>
{
    var bounds = ThisControlExtension.GetAbsoluteBounds(sourceView);
    var action = await UserInteraction.Menu(CancellationToken.None, true, bounds, null, null, -1, "Cancel", "Remove", "Rename", "Copy", "Open");
    //if(action == 1) ...
});

sample.xaml

<ContentPage ... x:Name="ThePage">

  <Button Text="My Button"
        Command="{Binding SomeCommand,Source={x:Reference ThePage}}" 
        CommandParameter="{vapolia:ThisControl}" />

</ContentPage>

ScreenLocation.android.cs

using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly:Dependency(typeof(Vapolia.Droid.ScreenLocation))]

namespace Vapolia.Droid
{
    public class ScreenLocation : IScreenLocation
    {
        public System.Drawing.PointF GetCoordinates(VisualElement element)
        {
            var renderer = Platform.GetRenderer(element);
            var nativeView = renderer.View;
            var density = nativeView.Context!.Resources!.DisplayMetrics!.Density;

            var locationWindow = new int[2];
            nativeView.GetLocationInWindow(locationWindow);
            var locationOfRootWindow = new int[2];
            nativeView.RootView.FindViewById(Android.Resource.Id.Content).GetLocationInWindow(locationOfRootWindow);
            
            return new System.Drawing.PointF(locationWindow[0] / density, (locationWindow[1]-locationOfRootWindow[1]) / density);
        }
    }
}

ScreenLocation.ios.cs

using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly:Dependency(typeof(Vapolia.iOS.ScreenLocation))]

namespace Vapolia.iOS
{
    public class ScreenLocation : IScreenLocation
    {
        public System.Drawing.PointF GetCoordinates(VisualElement element)
        {
            var renderer = Platform.GetRenderer(element);
            var nativeView = renderer.NativeView;
            var rect = nativeView.Superview.ConvertPointToView(nativeView.Frame.Location, null);
            return new System.Drawing.PointF((float)rect.X, (float)rect.Y);
        }
    }
}

ThisControlExtension.cs

namespace Vapolia
{
  /// <summary>
  /// Sample Usage:
  /// <Button Text="Click Me" Command="{Binding SomeCommand}" CommandParameter="{Binding Source={vapolia:ThisControl}}" />
  /// </summary>
  public sealed class ThisControlExtension : IMarkupExtension<VisualElement>
  {
      public VisualElement ProvideValue(IServiceProvider sp)
      {
          var target = (IProvideValueTarget)sp.GetService(typeof(IProvideValueTarget));
          return (VisualElement)target.TargetObject;
      }

      object IMarkupExtension.ProvideValue(IServiceProvider serviceProvider) => ProvideValue(serviceProvider);

      public static RectangleF GetAbsoluteBounds(VisualElement view)
      {
          var screenLocation = DependencyService.Get<IScreenLocation>();
          var pos = screenLocation.GetCoordinates(view);
          return new(pos.X, pos.Y, (float)view.Width, (float)view.Height);
      }
  };
}