PDFOffice_Windows_exe/PDF Office/ViewModels/Dialog/HomePageToolsDialogs/HomePagePrinter/HomePagePrinterDialogViewModel.cs

using Prism.Commands;
using Prism.Mvvm;
using Prism.Regions;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Windows;
using System.Drawing.Printing;
using ComPDFKit.PDFDocument;
using PDF_Office.Model;
using System.Drawing;
using System.Reflection;
using PDF_Office.Model.Dialog.HomePageToolsDialogs.HomePagePrinter;
using System.Threading.Tasks;
using ComPDFKit.PDFPage;
using PDF_Office.Helper;
using System.Drawing.Drawing2D;
using ComPDFKitViewer.PdfViewer;
using System.Windows.Media.Imaging;
using System.Drawing.Imaging;
using PDF_Office.CustomControl;
using Prism.Events;
using ImTools;
using PDF_Office.Views.Dialog.HomePageToolsDialogs.HomePagePrinter;
using System.Printing;
using System.Windows.Media.Animation;
using System.Windows.Controls;
using static Dropbox.Api.TeamLog.SharedLinkAccessLevel;
using DryIoc;
using System.Text.RegularExpressions;
using System.Diagnostics;
using PDF_Office.EventAggregators;
using System.Collections.ObjectModel;

namespace PDF_Office.ViewModels.Dialog.HomePageToolsDialogs.HomePagePrinter
{

    public class HomePagePrinterDialogViewModel : BindableBase, IDialogAware
    {
        public IRegionManager printRegion;
        public IDialogService printDialogs;
        public IEventAggregator printEvent;

        private CPDFViewer PDFViewer;


        public PrintSettingsInfo PrintSettingsInfo = new PrintSettingsInfo();

        #region 常用字符串
        public string Title => "Primter";
        public string HomePagePrinterDocumentName = "HomePagePrinterDocumentContent";
        public string HomePagePrinterModSizeName = "HomePagePrinterModSizeContent";
        public string HomePagePrinterModPosterName = "HomePagePrinterModPosterContent";
        public string HomePagePrinterModMultipleName = "HomePagePrinterModMultipleContent";
        public string HomePagePrinterModBookletName = "HomePagePrinterModBookletContent";
        #endregion

        #region 字典
        public Dictionary<string, string> GetPrintModNameFromRadioButton = new Dictionary<string, string>();
        #endregion 

        #region 打印系统配置
        private readonly PrintServer localDefaultPrintServer = new PrintServer();
        private PrintQueue printQueue;
        #endregion

        #region 打印参数设置
        /// <summary>
        /// （文档本身的）打印页集合
        /// </summary>
        private List<int> DocumentTargetPages = new List<int>();
        #endregion

        private int _printOrientationIndex = 0;
        public int PrintOrientationIndex
        {
            get => _printOrientationIndex;
            set => SetProperty(ref _printOrientationIndex, value);
        }
        #region 相关region
        private string _homePagePrinterDocumentRegionName;
        public string HomePagePrinterDocumentRegionName
        {
            get { return _homePagePrinterDocumentRegionName; }
            set { _homePagePrinterDocumentRegionName = value; }
        }

        private string _homePagePrinterModRegionName;
        public string HomePagePrinterModRegionName
        {
            get { return _homePagePrinterModRegionName; }
            set { _homePagePrinterModRegionName = value; }
        }
        #endregion

        #region 打印参数设置
        /// <summary>
        /// 打印机名称
        /// </summary>
        public string PrinterName;

        private int _maxCopiesNumber;
        /// <summary>
        /// 最大打印份数
        /// </summary>
        public int MaxCopiesNumber
        {
            get => _maxCopiesNumber;
            set => SetProperty(ref _maxCopiesNumber, value);
        }

        /// <summary>
        /// 打印机支持的颜色
        /// </summary>
        public List<OutputColor> OutputColorList = new List<OutputColor>();
        #endregion

        #region 组件
        private List<string> _printerNameList;
        /// <summary>
        /// 打印机名
        /// </summary>
        public List<string> PrinterNameList
        {
            get { return _printerNameList; }
            set { _printerNameList = value; }
        }

        private List<string> _printContentList;
        /// <summary>
        /// 打印内容
        /// </summary>
        public List<string> PrintContentList
        {
            get { return _printContentList; }
            set { _printContentList = value; }
        }

        private int _printContentIndex = 0;
        public int PrintContentIndex
        {
            get => _printContentIndex;
            set => SetProperty(ref _printContentIndex, value);
        }

        private List<string> _printerOrientationList;
        /// <summary>
        /// 打印列表
        /// </summary>
        public List<string> PrintOrientationList
        {
            get { return _printerOrientationList; }
            set
            {
                _printerOrientationList = value;
            }
        }

        private int _printerSelectedIndex;
        public int PrinterSelectedIndex
        {
            get => _printerSelectedIndex;
            set => SetProperty(ref _printerSelectedIndex, value);
        }
        #endregion

        #region 打印态
        private bool _isBothSides;
        public bool IsBothSides
        {
            get => _isBothSides;
            set => _isBothSides = value;
        }

        public enum EnumBothSidesStage
        {
            StatusFrontSide,
            StatusBackSide
        }

        /// <summary>
        /// 双面打印阶段：正面或背面
        /// </summary>
        public EnumBothSidesStage BothSidesStage;

        #endregion

        #region 窗口相关参数
        private EnumPrintMod currentHomePagePrinterMod;

        private string _currentHomePagePrinterModName;

        public string CurrentHomePagePrinterModName
        {
            get => _currentHomePagePrinterModName;
            set
            {
                _currentHomePagePrinterModName = value;
                if (value == "HomePagePrinterModSizeContent")
                {
                    currentHomePagePrinterMod = EnumPrintMod.StatusSize;
                }
                else if (value == "HomePagePrinterModPosterContent")
                {
                    currentHomePagePrinterMod = EnumPrintMod.StatusPoster;
                }
                else if (value == "HomePagePrinterModMultipleContent")
                {
                    currentHomePagePrinterMod = EnumPrintMod.StatusMultiple;
                }
                else if (value == "HomePagePrinterModBookletContent")
                {
                    currentHomePagePrinterMod = EnumPrintMod.StatusBooklet;
                }
            }
        }

        public bool IsFirstOpen = true;
        string Unicode = null;
        #endregion

        #region 委托
        public DelegateCommand CancelCommand { get; set; }
        public DelegateCommand ConfirmPrintCommand { get; set; }
        public DelegateCommand SetPaperCommand { get; set; }
        public DelegateCommand<object> SelectPrinterCommand { get; set; }
        public DelegateCommand<object> ChangePrintModCommand { get; set; }
        public DelegateCommand<object> SetGrayscaleCommand { get; set; }
        public DelegateCommand<object> SetDuplexCommand { get; set; }
        public DelegateCommand<object> SetPageRangeSelectionIndexCommand { get; set; }
        public DelegateCommand<object> SetCustomPageRangeCommand { get; set; }
        public DelegateCommand<object> SetPrintContentCommand { get; set; }
        public DelegateCommand<object> SetReversePageCommand { get; set; }
        public DelegateCommand<object> SetPrintBorderCommand { get; set; }
        public DelegateCommand<object> SetPrintOritationCommand { get; set; }
        #endregion

        HomePagePrinterDialogViewModel(IRegionManager regionManager, IDialogService dialogService, IEventAggregator eventAggregator)
        {
            this.printRegion = regionManager;
            this.printDialogs = dialogService;
            this.printEvent = eventAggregator;

            HomePagePrinterDocumentRegionName = Guid.NewGuid().ToString();
            HomePagePrinterModRegionName = Guid.NewGuid().ToString();

            CancelCommand = new DelegateCommand(Cancel);
            ConfirmPrintCommand = new DelegateCommand(ConfirmPrint);
            SetPaperCommand = new DelegateCommand(SetPaper);
            SelectPrinterCommand = new DelegateCommand<object>(SelectPrinter);
            ChangePrintModCommand = new DelegateCommand<object>(ChangePrintMod);
            SetGrayscaleCommand = new DelegateCommand<object>(SetGrayscale);
            SetDuplexCommand = new DelegateCommand<object>(SetDuplex);
            SetPageRangeSelectionIndexCommand = new DelegateCommand<object>(SetPageRangeSelectionIndex);
            SetCustomPageRangeCommand = new DelegateCommand<object>(SetCustomPageRange);
            SetPrintContentCommand = new DelegateCommand<object>(SetPrintContent);
            SetReversePageCommand = new DelegateCommand<object>(SetReversePage);
            SetPrintBorderCommand = new DelegateCommand<object>(SetPrintBorder);
            SetPrintOritationCommand = new DelegateCommand<object>(SetPrintOritation);
           Unicode = Guid.NewGuid().ToString();
            InitComponent();
            InitDictionary();
            InitParams();

            printEvent.GetEvent<SendPrintSettingsModInfoEvent>().Subscribe(RecvPrintSettingsModInfo, e => e.Unicode == Unicode);
        }

        private void InitComponent()
        {
            InitPrinterNameList();
            InitPrintContentList();
            InitPrintOrientationList();
        }

        private void InitDictionary()
        {
            InitGetPrintModNameFromRadioButton();
        }

        private void InitParams()
        {
            printQueue = localDefaultPrintServer.GetPrintQueue(PrinterName);
            List<PageMediaSize> PageMediaSizeList = new List<PageMediaSize>();
            foreach (PageMediaSize size in printQueue.GetPrintCapabilities().PageMediaSizeCapability)
            {
                if (size == null || size.PageMediaSizeName == null)
                {
                    continue;
                }
                if (size.PageMediaSizeName == PageMediaSizeName.ISOA4)
                {
                    PrintSettingsInfo.PageMediaSize = size;
                }
                PageMediaSizeList.Add(size);
            }
            if (PrintSettingsInfo.PageMediaSize == null)
            {
                PrintSettingsInfo.PageMediaSize = PageMediaSizeList[0];
            }
        }

        private void InitPrinterNameList()
        {
            PrinterNameList = new List<string>();
            PrintDocument printDocument = new PrintDocument();
            string defaultPrinterName = printDocument.PrinterSettings.PrinterName;
            foreach (string printerListItem in PrinterSettings.InstalledPrinters)
            {
                PrinterNameList.Add(printerListItem);
            }
            if (PrinterNameList.Contains("Microsoft Print to PDF"))
            {
                PrinterSelectedIndex = PrinterNameList.IndexOf("Microsoft Print to PDF");
            }
            else
            {
                PrinterSelectedIndex = 0;
            }
            PrinterName = PrinterNameList[PrinterSelectedIndex];
        }



        private void InitPrintContentList()
        {
            PrintContentList = new List<string>();
            PrintContentList.Add("文档");
            PrintContentList.Add("文档和标记");
            PrintContentList.Add("文档和图章");
            PrintContentList.Add("文档和表单");
        }

        private void InitPrintOrientationList()
        {
            PrintOrientationList = new List<string>();
            PrintOrientationList.Add("纵向");
            PrintOrientationList.Add("横向");
        }

        public void InitGetPrintModNameFromRadioButton()
        {
            GetPrintModNameFromRadioButton.Clear();
            GetPrintModNameFromRadioButton.Add("ModSizeRdo", HomePagePrinterModSizeName);
            GetPrintModNameFromRadioButton.Add("ModPosterRdo", HomePagePrinterModPosterName);
            GetPrintModNameFromRadioButton.Add("ModMultipleRdo", HomePagePrinterModMultipleName);
            GetPrintModNameFromRadioButton.Add("ModBookletRdo", HomePagePrinterModBookletName);
        }

        public void AutoOritation()
        {
            //纸张长边为高
            //if (PrintSettingsInfo.PageMediaSize.Height / PrintSettingsInfo.PageMediaSize.Width >= 1)
            //{
            //    //PDF长边为高
            //    if (PDFViewer.Document.GetPageSize(0).Height / PDFViewer.Document.GetPageSize(0).Width >= 1)
            //    {
            //        PrintSettingsInfo.EnumPrintOrientation = EnumPrintOrientation.StatusPortrait;
            //    }
            //    //PDF长边为宽
            //    else
            //    {
            //        PrintSettingsInfo.EnumPrintOrientation = EnumPrintOrientation.StatusLandscape;
            //    }
            //}
            ////纸张短边为高
            //else
            //{
            //    //PDF长边为高
            //    if (PDFViewer.Document.GetPageSize(0).Height / PDFViewer.Document.GetPageSize(0).Width >= 1)
            //    {
            //        PrintSettingsInfo.EnumPrintOrientation = EnumPrintOrientation.StatusLandscape;
            //    }
            //    //PDF长边为宽
            //    else
            //    {
            //        PrintSettingsInfo.EnumPrintOrientation = EnumPrintOrientation.StatusPortrait;
            //    }
            //}
            //PrintOrientationIndex = (int)PrintSettingsInfo.EnumPrintOrientation;
        }

        public void InitParamsByPDFView()
        {
            AutoOritation();
        }
        /// <summary>
        /// 选择打印机
        /// </summary>
        /// <param name="e"></param>
        public void SelectPrinter(object e)
        {
            var comboBox = e as ComboBox;
            PrinterName = comboBox.SelectedItem.ToString();
        }

        /// <summary>
        /// 打开纸张设置窗口
        /// </summary>
        public void SetPaper()
        {
            printQueue = localDefaultPrintServer.GetPrintQueue(PrinterName);
            LoadPrinterSettings();
            DialogParameters value = new DialogParameters();
            value.Add("Unicode", Unicode);
            value.Add(ParameterNames.PrintQueue, printQueue);
            printDialogs.ShowDialog(DialogNames.HomePagePrinterPaperSettingsDialog, value, e =>
            {
                if (e.Result == ButtonResult.OK)
                {
                    PrintSettingsInfo.PageMediaSize = e.Parameters.GetValue<PageMediaSize>("PageMediaSize");
                    PrintSettingsInfo.Margin.Clear();
                    PrintSettingsInfo.Margin.Add(e.Parameters.GetValue<int>("MarginLeft"));
                    PrintSettingsInfo.Margin.Add(e.Parameters.GetValue<int>("MarginTop"));
                    PrintSettingsInfo.Margin.Add(e.Parameters.GetValue<int>("MarginRight"));
                    PrintSettingsInfo.Margin.Add(e.Parameters.GetValue<int>("MarginBottom"));
                    AutoOritation();
                    this.printEvent.GetEvent<SendPrintSettingsInfoEvent>().Publish(new PrintSettingsInfoWithUnicode { printSettingsInfo = this.PrintSettingsInfo, Unicode = this.Unicode });
   
                }
            });
        }

        public void ChangePrintMod(object e)
        {
            var rdo = e as RadioButton;
            CurrentHomePagePrinterModName = GetPrintModNameFromRadioButton[rdo.Name];
            NavigationParameters param = new NavigationParameters();
            param.Add("document", PDFViewer.Document);
            param.Add("Unicode", Unicode);
            printRegion.RequestNavigate(HomePagePrinterModRegionName, CurrentHomePagePrinterModName, param);
        }

        /// <summary>
        /// 加载对应打印设置
        /// </summary>
        public void LoadPrinterSettings()
        {
            if (printQueue.GetPrintCapabilities().MaxCopyCount.HasValue)
            {
                MaxCopiesNumber = printQueue.GetPrintCapabilities().MaxCopyCount.Value;
            }
            else
            {
                MaxCopiesNumber = 1;
            }

            OutputColorList.Clear();
            foreach (OutputColor color in printQueue.GetPrintCapabilities().OutputColorCapability)
            {
                OutputColorList.Add(color);
            }
        }

        #region 来自UI的设置
        /// <summary>
        /// 设置灰度
        /// 改变打印机设置
        /// 改变渲染
        /// </summary>
        public void SetGrayscale(object e)
        {
            var chk = e as CheckBox;
            if ((bool)chk.IsChecked)
            {
                PrintSettingsInfo.IsGrayscale = true;
            }
            else if (!(bool)chk.IsChecked)
            {
                PrintSettingsInfo.IsGrayscale = false;
            }
            this.printEvent.GetEvent<SendPrintSettingsInfoEvent>().Publish(new PrintSettingsInfoWithUnicode { printSettingsInfo = this.PrintSettingsInfo, Unicode = this.Unicode });

        }

        /// <summary>
        /// 设置双面打印
        /// 改变打印流程
        /// 不改变打印相关参数
        /// </summary>
        /// <param name="e"></param>
        public void SetDuplex(object e)
        {
            var chk = e as CheckBox;
            if ((bool)chk.IsChecked)
            {
                PrintSettingsInfo.IsDuplex = true;
            }
            else if (!(bool)chk.IsChecked)
            {
                PrintSettingsInfo.IsDuplex = false;
            }
        }

        public void SetPageRangeSelectionIndex(object e)
        {
            var cmb = e as WritableComboBox;
            PrintSettingsInfo.PageRangeList.Clear();
            PrintSettingsInfo.EnumPageRange = (EnumPageRange)int.Parse(cmb.SelectedIndex);
            if (int.Parse(cmb.SelectedIndex) < cmb.Items.Count - 1)
            {
                PrintSettingsInfo.EnumPageRange = (EnumPageRange)int.Parse(cmb.SelectedIndex);
                if (PrintSettingsInfo.EnumPageRange == EnumPageRange.StatusAllRange)
                {
                    for (int temp = 0; temp < PDFViewer.Document.PageCount; temp++)
                    {
                        PrintSettingsInfo.PageRangeList.Add(temp);
                    }
                }
                else if (PrintSettingsInfo.EnumPageRange == EnumPageRange.StatusOddRange)
                {
                    for (int temp = 0; temp < PDFViewer.Document.PageCount; temp += 2)
                    {
                        PrintSettingsInfo.PageRangeList.Add(temp);
                    }
                }
                else if (PrintSettingsInfo.EnumPageRange == EnumPageRange.StatusEvenRange)
                {
                    //TODO： 偶数页页数不够异常
                    if (PDFViewer.Document.PageCount <= 1)
                    {
                        for (int temp = 0; temp < PDFViewer.Document.PageCount; temp++)
                        {
                            PrintSettingsInfo.PageRangeList.Add(temp);
                        }
                    }
                    else
                    {
                        for (int temp = 1; temp < PDFViewer.Document.PageCount; temp += 2)
                        {
                            PrintSettingsInfo.PageRangeList.Add(temp);
                        }
                    }
                }
                this.printEvent.GetEvent<SendPrintSettingsInfoEvent>().Publish(new PrintSettingsInfoWithUnicode { printSettingsInfo = this.PrintSettingsInfo, Unicode = this.Unicode });

            }
        }

        public void SetCustomPageRange(object e)
        {
            if (PrintSettingsInfo.EnumPageRange == EnumPageRange.StatusCustomizedRange)
            {
                var cmb = e as WritableComboBox;
                if (cmb == null)
                {
                    return;
                }
                if (!CommonHelper.GetPagesInRange(ref DocumentTargetPages, cmb.Text, PDFViewer.Document.PageCount, new char[] { ',' }, new char[] { '-' }))
                { //TODO
                    Trace.WriteLine("输入不对");
                    MessageBoxEx.Show("输入不对");
                    return;
                }
                PrintSettingsInfo.PageRangeList.Clear();
                PrintSettingsInfo.PageRangeList = DocumentTargetPages;
            }
        }

        public void SetPrintOritation(object e)
        {
            var cmb = e as ComboBox;
            PrintSettingsInfo.EnumPrintOrientation = (EnumPrintOrientation)cmb.SelectedIndex;
            this.printEvent.GetEvent<SendPrintSettingsInfoEvent>().Publish(new PrintSettingsInfoWithUnicode { printSettingsInfo = this.PrintSettingsInfo, Unicode = this.Unicode });

        }

        public void SetPrintContent(object e)
        {
            var cmb = e as ComboBox;
            if (cmb.SelectedIndex == (int)EnumPrintContent.StatusOnlyDocument)
            {
                PrintSettingsInfo.IsPrintWithAnnot = false;
                PrintSettingsInfo.IsPrintWithForm = false;
            }
            else if (cmb.SelectedIndex == (int)EnumPrintContent.StatusDocumentAndMarkUps)
            {
                PrintSettingsInfo.IsPrintWithAnnot = true;
                PrintSettingsInfo.IsPrintWithForm = true;
            }
            else if (cmb.SelectedIndex == (int)EnumPrintContent.StatusDocumentAndStamps)
            {
                PrintSettingsInfo.IsPrintWithAnnot = true;
                PrintSettingsInfo.IsPrintWithForm = false;
            }
            else if (cmb.SelectedIndex == (int)EnumPrintContent.StatusDocumentAndForm)
            {
                PrintSettingsInfo.IsPrintWithAnnot = false;
                PrintSettingsInfo.IsPrintWithForm = true;
            }
            this.printEvent.GetEvent<SendPrintSettingsInfoEvent>().Publish(new PrintSettingsInfoWithUnicode { printSettingsInfo = this.PrintSettingsInfo, Unicode = this.Unicode });
        }

        public void SetReversePage(object e)
        {
            PrintSettingsInfo.PageRangeList.Reverse();
            this.printEvent.GetEvent<SendPrintSettingsInfoEvent>().Publish(new PrintSettingsInfoWithUnicode { printSettingsInfo = this.PrintSettingsInfo, Unicode = this.Unicode });

        }

        public void SetPrintBorder(object e)
        {
            var chk = e as CheckBox;
            if ((bool)chk.IsChecked)
            {
                PrintSettingsInfo.IsPrintPageBorde = true;
            }
            else
            {
                PrintSettingsInfo.IsPrintPageBorde = false;
            }
            this.printEvent.GetEvent<SendPrintSettingsInfoEvent>().Publish(new PrintSettingsInfoWithUnicode { printSettingsInfo = this.PrintSettingsInfo, Unicode = this.Unicode });
        }

        public void RecvPrintSettingsModInfo(PrintModInfoWithUnicode printModInfoWithUnicode)
        {
            if (printModInfoWithUnicode.printModInfo.EnumPrintMod == currentHomePagePrinterMod)
            {
                PrintSettingsInfo.printModInfo = printModInfoWithUnicode.printModInfo;
                this.printEvent.GetEvent<SendPrintSettingsInfoEvent>().Publish(new PrintSettingsInfoWithUnicode { printSettingsInfo = this.PrintSettingsInfo, Unicode = this.Unicode });
            }
        }

        #endregion
        public void Cancel()
        {
            RequestClose.Invoke(new DialogResult(ButtonResult.Cancel));
        }

        public void NavigateDocumentRegion()
        {
            NavigationParameters param = new NavigationParameters();
            param.Add(ParameterNames.PDFViewer, PDFViewer);
            param.Add(ParameterNames.PrintSettingsInfo, PrintSettingsInfo);
            param.Add("Unicode", Unicode);
            printRegion.RequestNavigate(HomePagePrinterDocumentRegionName, HomePagePrinterDocumentName, param);
        }

        public void NavigateModRegion()
        {
            NavigationParameters param = new NavigationParameters();
            param.Add(ParameterNames.PDFViewer, PDFViewer);
            param.Add("Unicode", Unicode);
            printRegion.RequestNavigate(HomePagePrinterModRegionName, HomePagePrinterModSizeName);
        }

        /// <summary>
        /// 确认打印，单面或手动双面
        /// </summary>
        public void ConfirmPrint()
        {
            printQueue = localDefaultPrintServer.GetPrintQueue(PrinterName);
            LoadPrinterSettings();
            this.printEvent.GetEvent<SendPrintQueueEvent>().Publish(new PrintQueueWithUnicode {printQueue= this.printQueue ,Unicode = this.Unicode});
            //Collection<Duplexing> list = new Collection<Duplexing>();

            //if (printQueue.GetPrintCapabilities().DuplexingCapability.Count > 0)
            //{
            //    list.Clear();
            //    for (int temp = 0; temp < printQueue.GetPrintCapabilities().DuplexingCapability.Count; temp++)
            //    {
            //        list.Add(printQueue.GetPrintCapabilities().DuplexingCapability[temp]);
            //    }
            //}
            //if (!IsBothSides)
            //{
            //    RequestClose.Invoke(new DialogResult(ButtonResult.OK));
            //}
            //else if (IsBothSides)
            //{
            //    MessageBoxEx.Show("翻页");
            //}
        }

        public event Action<IDialogResult> RequestClose;

        public bool CanCloseDialog()
        {
            return true;
        }

        public void OnDialogClosed()
        {
            this.printQueue.Dispose();
        }

        public void OnDialogOpened(IDialogParameters parameters)
        {
            parameters.TryGetValue<CPDFViewer>(ParameterNames.PDFViewer, out PDFViewer);
            if (PDFViewer != null)
            {
                //文件损坏导致无法读取
                try
                {
                    for (int temp = 0; temp < PDFViewer.Document.PageCount; temp++)
                    {
                        PrintSettingsInfo.PageRangeList.Add(temp);
                    }
                    NavigationParameters param = new NavigationParameters();
                    NavigateDocumentRegion();
                    NavigateModRegion();
                    InitParamsByPDFView();
                }catch
                {
                    PDFViewer = null;
                } 
            }
        }
    }
}