MMM/ViewModels/OtelsViewModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Avalonia.Controls;
using Microsoft.EntityFrameworkCore;
using MsBox.Avalonia;
using MsBox.Avalonia.Enums;
using ReactiveUI;
using TourAgent.Models;
using TourAgent.Views;

namespace MPrakt.ViewModels
{
	public class OtelsViewModel : ReactiveObject
	{
        UP_SmirnovContext DB = new UP_SmirnovContext();
        UserControl us = new TourAgent.Views.Menu();

        public UserControl US
        {
            get => us;
            set => this.RaiseAndSetIfChanged(ref us, value);
        }

        private List<Otel>? _hotels;
        public List<Otel>? Hotels { get => _hotels; set => this.RaiseAndSetIfChanged(ref _hotels, value); }
        private int countElements = 10;
        public int CountElements { get => countElements; set => this.RaiseAndSetIfChanged(ref countElements, value); }
        private int _page = 1;
        public int Page { get => _page; set => this.RaiseAndSetIfChanged(ref _page, value); }
        private bool _enableOrNotRight = true;
        public bool EnableOrNotRight { get => _enableOrNotRight; set => this.RaiseAndSetIfChanged(ref _enableOrNotRight, value); }
        private bool _enableOrNotLeft = false;
        public bool EnableOrNotLeft { get => _enableOrNotLeft; set => this.RaiseAndSetIfChanged(ref _enableOrNotLeft, value); }
        int flagElementCount = 0;
        public void ChangePageToHotels()
        {
            US = new Hotels();
        }
        public void ChangePageToTours()
        {
            US = new TourAgent.Views.Hotels();
        }

        public void ToMenu()
        {
            US = new TourAgent.Views.Menu();
        }
        public OtelsViewModel() 
        { 
            Hotels = DB.Hotels.ToList();
            Hotels = Hotels.Take(CountElements).ToList();
            
        }



        public void NextPage()
        {
            Page++;
            Hotels = DB.Hotels.ToList();
            Hotels = Hotels.Skip((Page - 1) * CountElements).ToList();
            flagElementCount = Hotels.Count();
            Hotels = Hotels.Take(CountElements).ToList();
            EnableOrNotLeft = true;
            if (flagElementCount <= CountElements)
            {
                EnableOrNotRight = false;
            }
            else
            {
                EnableOrNotRight = true;
            }
        }

        public void PrevPage()
        {
            Page--;
            Hotels = DB.Hotels.ToList();
            Hotels = Hotels.Skip((Page-1)*CountElements).ToList();
            Hotels = Hotels.Take(CountElements).ToList();
            EnableOrNotRight = true;
            if (Page == 1)
            {
                EnableOrNotLeft = false;
            }
            else
            {
                EnableOrNotLeft = true;
            }
        }

        public void ToFirstPage()
        {
            Page = 1;
            Hotels = DB.Hotels.ToList();
            Hotels = Hotels.Take(CountElements).ToList();
            EnableOrNotLeft = false;
            EnableOrNotRight = true;
        }

        public void ToLastPage()
        {
            Hotels = DB.Hotels.ToList();
            Page = Hotels.Count / CountElements + 1;
            Hotels = Hotels.Skip(Page * CountElements).ToList();
            Hotels = Hotels.Take(CountElements).ToList();
            EnableOrNotRight = false;
            EnableOrNotLeft = true;
        }

       
       

        public override bool Equals(object? obj)
        {
            return base.Equals(obj);
        }

        public override int GetHashCode()
        {
            return base.GetHashCode();
        }

        public override string? ToString()
        {
            return base.ToString();
        }
    }
}