avaloniaProject/ViewModels/MainWindowViewModel.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Shapes;
using Avalonia.Media;
using Avalonia.Threading;
using avaloniaPr.Models;
using avaloniaPr.Views;
using ReactiveUI;
using System;
using System.Threading;

namespace avaloniaPr.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {
        UserControl us = new Autorization();
        Canvas canvas;
        string login = "";
        string password = "";
        bool enbld = true;
        string check;
        bool vsbltButton = true;
        bool vsbltCaptcha = false;
        bool vsbltWaiting = false;
        string capcha = "";

        string waiting = "Ошибка. Попробуйте снова через 10 секунд";
        DispatcherTimer DT = new DispatcherTimer();
        public UserControl US
        {
            get => us;
            set => this.RaiseAndSetIfChanged(ref us, value);
        }

        public AutorizationViewModel AutorizationVM { get => autorizationVM; set => autorizationVM = value; }

        AutorizationViewModel autorizationVM = new AutorizationViewModel();

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

        CalculatorViewModel calculatorVM = new CalculatorViewModel();


        public string LoginUs
        {
            get => login;
            set => this.RaiseAndSetIfChanged(ref login, value);
        }
        public string PasswordUs
        {
            get => password;
            set => this.RaiseAndSetIfChanged(ref password, value);
        }
        public bool VisibilityButton
        {
            get => vsbltButton;
            set => this.RaiseAndSetIfChanged(ref vsbltButton, value);

        }
        public bool VisibilityCaptcha
        {
            get => vsbltCaptcha;
            set => this.RaiseAndSetIfChanged(ref vsbltCaptcha, value);

        }
        public bool VisibilityWaiting
        {
            get => vsbltWaiting;
            set => this.RaiseAndSetIfChanged(ref vsbltWaiting, value);

        }
        public string Capcha
        {
            get => capcha;
            set => this.RaiseAndSetIfChanged(ref capcha, value);
        }
        public string Waiting
        {
            get => waiting;
            set => this.RaiseAndSetIfChanged(ref waiting, value);
        }

        public void AutorizationButton()
        {
            if (LoginUs != Models.UserData.UserLogin || PasswordUs != Models.UserData.UserPassword)
            {
                VisibilityCaptcha = true;
                VisibilityButton = false;
                CreateCaptcha();
            }
            else
            {
                US = new Calculator();
            }
        }
        public Canvas CanvasText
        {
            get => canvas;
            set => this.RaiseAndSetIfChanged(ref canvas, value);
        }
        public void CreateCaptcha() // метод для создания Canvas, внутри которого рандомно генерируются линии
        {
            LoginUs = "";
            PasswordUs = "";

            SolidColorBrush color = new SolidColorBrush(Color.FromRgb(155, 155, 155));
            Canvas canvas = new Canvas()
            {
                Width = 210,
                Height = 100,
                Background = color
            };
            Random rnd = new Random();
            TextBlock TB1 = new TextBlock()
            {
                Text = Convert.ToString(rnd.Next(0, 9)),
                FontSize = 30,
                Foreground = Brushes.Black,
                Padding = new Thickness(20)
            };
            TextBlock TB2 = new TextBlock()
            {
                Text = Convert.ToString(Convert.ToChar(rnd.Next(97, 123))),
                FontSize = 30,
                Foreground = Brushes.Black,
                Padding = new Thickness(40)
            };
            TextBlock TB3 = new TextBlock()
            {
                Text = Convert.ToString(rnd.Next(0, 20)),
                FontSize = 30,
                Foreground = Brushes.Black,
                Padding = new Thickness(60, 10),
            };
            TextBlock TB4 = new TextBlock()
            {
                Text = Convert.ToString(Convert.ToChar(rnd.Next(97, 123))),
                FontSize = 30,
                Foreground = Brushes.Black,
                Padding = new Thickness(100, 2)
            };
            TextBlock TB5 = new TextBlock()
            {
                Text = Convert.ToString(rnd.Next(0, 9)),
                FontSize = 30,
                Foreground = Brushes.Black,
                Padding = new Thickness(130, 10)
            };
            TextBlock TB6 = new TextBlock()
            {
                Text = Convert.ToString(Convert.ToChar(rnd.Next(65, 91))),
                FontSize = 30,
                Foreground = Brushes.Black,
                Padding = new Thickness(150, 1)
            };
            TextBlock TB7 = new TextBlock()
            {
                Text = Convert.ToString(Convert.ToChar(rnd.Next(97, 123))),
                FontSize = 30,
                Foreground = Brushes.Black,
                Padding = new Thickness(170, -3)
            };
            canvas.Children.Add(TB1);
            canvas.Children.Add(TB2);
            canvas.Children.Add(TB3);
            canvas.Children.Add(TB4);
            canvas.Children.Add(TB5);
            canvas.Children.Add(TB6);
            canvas.Children.Add(TB7);
            check = TB1.Text + TB2.Text + TB3.Text + TB4.Text + TB5.Text + TB6.Text + TB7.Text;
            for (int i = 0; i <= 10; i++)
            {
                Line line = new Line()
                {
                    StartPoint = new Point(rnd.Next(220), rnd.Next(100)),
                    EndPoint = new Point(rnd.Next(220), rnd.Next(100)),
                    Stroke = new SolidColorBrush(Color.FromRgb(Convert.ToByte(rnd.Next(0, 155)), Convert.ToByte(rnd.Next(0, 155)), Convert.ToByte(rnd.Next(0, 155)))),
                    StrokeThickness = 2
                };
                canvas.Children.Add(line);
            }
            CanvasText = canvas;
        }
        public bool Enabled
        {
            get => enbld;
            set => this.RaiseAndSetIfChanged(ref enbld, value);
        }
        public void CommandCaptcha()
        {
            if (Capcha != check || LoginUs != Models.UserData.UserLogin || PasswordUs != Models.UserData.UserPassword)
            {
                Enabled = false;
                VisibilityCaptcha = false;
                VisibilityWaiting = true;
                LoginUs = "";
                PasswordUs = "";
                Capcha = "";
                DT.Interval = new TimeSpan(0, 0, 10);
                DT.Tick += new EventHandler(TimerEnd);
                DT.Start();
                CreateCaptcha();
            }
            else
            {
                AutorizationButton();
            }
        }
        public void TimerEnd(object sender, EventArgs e)
        {
            Enabled = true;
            VisibilityWaiting = false;
            CreateCaptcha();
            VisibilityCaptcha = true;
            DT.Stop();
        }
    }
}