NewAuthAndCaptcha/AuthAndCaptcha/ViewModels/MainWindowViewModel.cs

using Avalonia.Controls;
using AuthAndCaptcha.Models;
using Avalonia.Interactivity;
using ReactiveUI;
using System;
using Avalonia.Media;
using Avalonia.Controls.Shapes;
using System.Runtime.Intrinsics.Arm;
using Avalonia.Threading;

namespace AuthAndCaptcha.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {

        UserControl uc = new Auth();
        public UserControl Uc { get => uc; set => this.RaiseAndSetIfChanged(ref uc, value); }

        AuthViewModel authVM = new AuthViewModel();
        public AuthViewModel AuthVM { get => authVM; set => authVM = value; }

        CalculatorViewModel calculatorVM = new CalculatorViewModel();
        public CalculatorViewModel CalculatorVM { get => calculatorVM; set => calculatorVM = value; }

        DispatcherTimer timer = new DispatcherTimer();
        

        private void TimerTick(object sender, EventArgs e)
        {
            AuthVM.CanTextTrue = "";
            AuthVM.CreateCaptcha();
            AuthVM.CanTextVisible = true;
            timer.Stop();
        }

        public void toPageCalc()
        {
            Uc = new Calculator();
        }

        public void Check()
        {
            if (AuthVM.UsersLogin == AuthClass.login && AuthVM.UsersPassword == AuthClass.password)
            {
                toPageCalc();
            }
            else
            {
                AuthVM.UsersLogin = "";
                AuthVM.UsersPassword = "";
                AuthVM.AuthButtonVisible = false;
                AuthVM.CanTextVisible = true;
                AuthVM.CreateCaptcha();
            }
        }

        public void CheckCaptcha()
        {
            if (AuthVM.UsersLogin == AuthClass.login && AuthVM.UsersPassword == AuthClass.password && AuthVM.CanText==AuthVM.CanTextTrue)
            {
                toPageCalc();
            }
            else
            {
                AuthVM.UsersLogin = "";
                AuthVM.UsersPassword = "";
                AuthVM.CanText = "";
                AuthVM.CanTextVisible = false;
                timer.Interval = new TimeSpan(0, 0, 10);
                timer.Tick += new EventHandler(TimerTick);
                timer.Start();

            }
        }
    }
}