using System.ComponentModel; using System.Runtime.CompilerServices; namespace Xamarin.Forms { public sealed class ChildGestureRecognizer : IGestureRecognizer { private IGestureRecognizer _gestureRecognizer; public IGestureRecognizer GestureRecognizer { get => _gestureRecognizer; set { _gestureRecognizer = value; OnPropertyChanged(); } } public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged([CallerMemberName]string propertyName = "") => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } }