PDFOffice_Windows_exe/PDF Office/ViewModels/ViewContentViewModel.cs

using Microsoft.Win32;
using Prism.Commands;
using Prism.Mvvm;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ComPDFKitViewer.PdfViewer;
using Prism.Regions;
using DryIoc;
using System.Diagnostics;
using Prism.Services.Dialogs;
using PDF_Office.CustomControl;
using PDF_Office.Model;
using System.Windows;
using System.Windows.Controls;
using System.IO;
using PDFSettings;
using ComPDFKitViewer.AnnotEvent;
using PDF_Office.ViewModels.Tools;
using PDF_Office.Views;
using Prism.Events;
using PDF_Office.EventAggregators;
using PDF_Office.Views.EditTools.Background;
using PDF_Office.Views.Dialog;
using PDF_Office.Helper;
using System.Security.Policy;
using System.Windows.Documents;

namespace PDF_Office.ViewModels
{
    public class ViewContentViewModel : BindableBase, INavigationAware
    {
        #region 属性、变量

        public CPDFViewer PDFViewer { get; set; }

        private MainContentViewModel mainViewModel { get; set; }

        public IRegionManager region;

        public IDialogService dialogs;

        public IEventAggregator events;

        public bool IsCreateLink { get => isCreateLink; set => isCreateLink = value; }

        public string ViwerRegionName { get; set; }

        /// <summary>
        /// 分屏视图的region名称
        /// </summary>
        public string SplitViewerRegionName { get; set; }

        /// <summary>
        /// OCR视图名称
        /// </summary>
        public string OCRViewerRegionName { get; set; }

        public string BOTARegionName { get; set; }

        public string PropertyRegionName { get; set; }

        public string ToolContentRegionName { get; set; }

        public string ToolsBarContentRegionName { get; set; }

        public string ReadModeRegionName { get; set; }

        public string ConverterBarContentRegionName { get; set; }
        public string TextEditContentRegionName { get; set; }

        public string BackgroundContentRegionName { get; set; }

        private Visibility readModelTip = Visibility.Collapsed;

        public Visibility ReadModelTip
        {
            get { return readModelTip; }
            set
            {
                SetProperty(ref readModelTip, value);
            }
        }

        /// <summary>
        /// 底部工具栏 RegionName
        /// </summary>
        public string BottomToolRegionName { get; set; }

        private bool _isInPageEdit = false;

        /// <summary>
        /// 是否处于页面编辑模式，用于执行undo redo 的具体操作
        /// </summary>
        public bool isInPageEdit
        {
            get { return _isInPageEdit; }
            set
            {
                _isInPageEdit = value;
                if (!value)
                {
                    CanRedo = PDFViewer.UndoManager.CanRedo;
                    CanUndo = PDFViewer.UndoManager.CanUndo;
                }
            }
        }

        public Action PageEditUndo { get; set; }

        public Action PageEditRedo { get; set; }

        /// <summary>
        ///工具条
        ///0：收起
        ///40：显示
        /// </summary>
        private int toolRowHeight = 40;

        public int ToolRowHeight
        {
            get { return toolRowHeight; }
            set
            {
                SetProperty(ref toolRowHeight, value);
            }
        }

        /// <summary>
        /// 水印，背景侧边栏宽度
        /// 0：收起
        /// 260：显示
        /// </summary>
        private int propertyColumnWidth = 0;

        public int PropertyColumnWidth
        {
            get { return propertyColumnWidth; }
            set
            {
                SetProperty(ref propertyColumnWidth, value);
            }
        }

        private int gridToolRow = 1;

        /// <summary>
        /// 控制ToolContent的Row
        /// </summary>
        public int GridToolRow
        {
            get { return gridToolRow; }
            set
            {
                SetProperty(ref gridToolRow, value);
            }
        }

        private int gridToolRowSpan = 3;

        /// <summary>
        /// 控制ToolContent的RowSpan
        /// </summary>
        public int GridToolRowSpan
        {
            get { return gridToolRowSpan; }
            set
            {
                SetProperty(ref gridToolRowSpan, value);
            }
        }

        private Visibility toolContentVisible = Visibility.Collapsed;

        /// <summary>
        /// 控制Content的显示 用于显示水印、贝茨码、密文等功能模块
        /// 留意：显示前需要先注入内容、设置好行和跨行数
        /// </summary>
        public Visibility ToolContentVisible
        {
            get { return toolContentVisible; }
            set
            {
                SetProperty(ref toolContentVisible, value);
            }
        }

        private Visibility gridVisibility = Visibility.Visible;

        /// <summary>
        /// 是否正在加载中
        /// </summary>
        public Visibility GridVisibility
        {
            get { return gridVisibility; }
            set
            {
                SetProperty(ref gridVisibility, value);
            }
        }

        private Visibility isLoading = Visibility.Collapsed;

        private Visibility ocrContentVisible = Visibility.Collapsed;

        public Visibility OCRContentVisible
        {
            get { return ocrContentVisible; }
            set
            {
                SetProperty(ref ocrContentVisible, value);
            }
        }

        /// <summary>
        /// 是否正在加载中
        /// </summary>
        public Visibility IsLoading
        {
            get { return isLoading; }
            set
            {
                SetProperty(ref isLoading, value);
            }
        }

        private Visibility converterBarContentVisible = Visibility.Collapsed;
        private Visibility toolsbarContentVisible = Visibility.Collapsed;

        /// <summary>
        /// 控制ToolsBarContent的显示
        /// 留意：显示前需要先注入内容、设置好行和跨行数
        /// </summary>
        public Visibility ConverterBarContentVisible
        {
            get { return converterBarContentVisible; }
            set
            {
                SetProperty(ref converterBarContentVisible, value);
            }
        }

        private Visibility toolsBarContentVisible = Visibility.Collapsed;

        /// <summary>
        /// 控制ToolsBarContent的显示
        /// 留意：显示前需要先注入内容、设置好行和跨行数
        /// </summary>
        public Visibility ToolsBarContentVisible
        {
            get { return toolsBarContentVisible; }
            set
            {
                SetProperty(ref toolsBarContentVisible, value);
            }
        }

        private Visibility textEditToolContentVisible = Visibility.Collapsed;

        /// <summary>
        /// 控制ToolsBarContent的显示
        /// 留意：显示前需要先注入内容、设置好行和跨行数
        /// </summary>
        public Visibility TextEditToolContentVisible
        {
            get { return textEditToolContentVisible; }
            set
            {
                SetProperty(ref textEditToolContentVisible, value);
            }
        }

        private bool isPorpertyOpen = false;

        /// <summary>
        /// 属性栏是否展开
        /// </summary>
        public bool IsPropertyOpen
        {
            get { return isPorpertyOpen; }
            set
            {
                SetProperty(ref isPorpertyOpen, value);
            }
        }

        private Visibility isReadMode = Visibility.Visible;

        /// <summary>
        ///是否为阅读模式
        /// </summary>
        public Visibility IsReadMode
        {
            get { return isReadMode; }
            set
            {
                SetProperty(ref isReadMode, value);
            }
        }

        private bool canSave;

        /// <summary>
        /// 是否可以保存
        /// </summary>
        public bool CanSave
        {
            get { return canSave; }
            set
            {
                SetProperty(ref canSave, value);
            }
        }

        private bool canUndo;

        /// <summary>
        /// 是否可以进行Undo
        /// </summary>
        public bool CanUndo
        {
            get { return canUndo; }
            set
            {
                SetProperty(ref canUndo, value);
            }
        }

        private bool canRedo;

        /// <summary>
        /// 是否可以进行Redo
        /// </summary>
        public bool CanRedo
        {
            get { return canRedo; }
            set
            {
                SetProperty(ref canRedo, value);
            }
        }

        private GridLength botaWidth = new GridLength(48);

        /// <summary>
        /// BOTA栏的宽度
        /// </summary>
        public GridLength BOTAWidth
        {
            get { return botaWidth; }
            set
            {
                SetProperty(ref botaWidth, value);
                if (botaWidth.Value <= 48)
                {
                    OpenBOTA = false;
                }
            }
        }

        private int selectedIndex;

        /// <summary>
        /// 工具栏选中项的索引
        /// </summary>
        public int TabSelectedIndex
        {
            get { return selectedIndex; }
            set
            {
                SetProperty(ref selectedIndex, value);
            }
        }

        private bool openBOTA = false;

        /// <summary>
        /// 是否展开BOTA
        /// </summary>
        public bool OpenBOTA
        {
            get { return openBOTA; }
            set
            {
                openBOTA = value;
                if (openBOTA && BOTAWidth.Value <= 48)
                {
                    BOTAWidth = new GridLength(256);
                }
            }
        }

        private Dictionary<string, string> regionNameByTabItem;

        private Dictionary<string, string> barContentByTabItem;

        private string previousBar = "";

        public string CurrentBar = "";

        public string unicode = null;

        /// <summary>
        /// 用来避免重复触发导航事件的标志符
        /// </summary>
        private bool isOpenFile = false;

        /// <summary>
        /// 鼠标滚轮缩放的缩放值
        /// </summary>
        private double[] zoomLevel = { 1.00f, 10, 25, 50, 75, 100, 125, 150, 200, 300, 400, 600, 800, 1000 };

        /// <summary>
        /// 注释-链接，提示语
        /// </summary>
        private Visibility linkAnnotTipVisibility = Visibility.Collapsed;

        public Visibility LinkAnnotTipVisibility
        {
            get { return linkAnnotTipVisibility; }
            set
            {
                SetProperty(ref linkAnnotTipVisibility, value);
            }
        }

        private string linkAnnotTipText = "Please use the scroll bar, thumbnail tool to locate the target page, click or box the area to select the target range";
        private bool isCreateLink = false;

        public string LinkAnnotTipText
        {
            get { return linkAnnotTipText; }
            set
            {
                SetProperty(ref linkAnnotTipText, value);
            }
        }

        #endregion 属性、变量

        #region 命令

        public DelegateCommand LoadFile { get; set; }

        public DelegateCommand Load { get; set; }

        public DelegateCommand<object> TabControlSelectionChangedCommand { get; set; }

        public DelegateCommand SaveFile { get; set; }

        public DelegateCommand SaveAsFile { get; set; }

        public DelegateCommand UndoCommand { get; set; }

        public DelegateCommand RedoCommand { get; set; }
        public DelegateCommand<object> MenuEnterReadMode { get; set; }

        public DelegateCommand PrintCommand { get; set; }

        public DelegateCommand SettingsCommand { get; set; }

        public DelegateCommand ShareCommand { get; set; }

        public DelegateCommand<object> CreateLinkCommand { get; set; }

        public DelegateCommand PropertyCommand { get; set; }

        public DelegateCommand ShowInFolderCommand { get; set; }

        #endregion 命令

        public ViewContentViewModel(IRegionManager regionManager, IDialogService dialogService, IEventAggregator eventAggregator)

        {
            region = regionManager;
            dialogs = dialogService;
            events = eventAggregator;
            unicode = App.mainWindowViewModel.SelectedItem.Unicode;
            LoadFile = new DelegateCommand(loadFile);
            Load = new DelegateCommand(LoadControl);
            SaveFile = new DelegateCommand(() => { saveFile(); }, CanSaveExcute).ObservesProperty(() => CanSave);
            SaveAsFile = new DelegateCommand(() => { saveAsFile(); });
            UndoCommand = new DelegateCommand(Undo);
            RedoCommand = new DelegateCommand(Redo);
            ShareCommand = new DelegateCommand(share);
            PropertyCommand = new DelegateCommand(property);
            ShowInFolderCommand = new DelegateCommand(ShowInFolder);
            TabControlSelectionChangedCommand = new DelegateCommand<object>(TabControlSelectonChangedEvent);

            ViwerRegionName = RegionNames.ViwerRegionName;
            SplitViewerRegionName = RegionNames.SplitScreenViewRegionName;
            BOTARegionName = RegionNames.BOTARegionName;
            PropertyRegionName = RegionNames.PropertyRegionName;
            BottomToolRegionName = RegionNames.BottomToolRegionName;
            ReadModeRegionName = RegionNames.ReadModeRegionName;
            MenuEnterReadMode = new DelegateCommand<object>(MenuEnterReadModeEvent);

            PrintCommand = new DelegateCommand(ShowPrintDialog);

            SettingsCommand = new DelegateCommand(SettingsEvent);
            CreateLinkCommand = new DelegateCommand<object>(CreateLinkEvent);

            //未显示时无法注册上Region名称
            ToolContentVisible = Visibility.Visible;
            ToolsBarContentVisible = Visibility.Visible;
            OCRContentVisible = Visibility.Visible;
            OCRViewerRegionName = RegionNames.OCRViewerRegionName;
            ToolContentRegionName = Guid.NewGuid().ToString();
            ToolsBarContentRegionName = Guid.NewGuid().ToString();
            ConverterBarContentRegionName = Guid.NewGuid().ToString();
            TextEditContentRegionName = Guid.NewGuid().ToString();

            ToolContentVisible = Visibility.Collapsed;
            ToolsBarContentVisible = Visibility.Collapsed;
            OCRContentVisible = Visibility.Collapsed;
            regionNameByTabItem = new Dictionary<string, string>();
            barContentByTabItem = new Dictionary<string, string>();
            InitialregionNameByTabItem(ref regionNameByTabItem);
            InitialbarContentByTabItem(ref barContentByTabItem);

            eventAggregator.GetEvent<EnterSelectedEditToolEvent>().Subscribe(EnterEditTools, e => e.Unicode == unicode);
            eventAggregator.GetEvent<CloseEditToolEvent>().Subscribe(CloseEditTool, e => e.Unicode == unicode);

            //TODO:根据缓存 选择用户上次选择的菜单
            EnterSelectedBar("TabItemAnnotation");
        }

        /// <summary>
        /// 右键菜单创建链接
        /// </summary>
        /// <param name="obj"></param>
        private void CreateLinkEvent(object obj)
        {
            if (obj is object[] objArry)
            {
                if (objArry[0] is AnnotToolContentViewModel toolContentViewModel && objArry[1] is AnnotCommandArgs annotCommand)
                {
                    LinkAnnotArgs linkArgs = new LinkAnnotArgs();
                    linkArgs.URI = string.Empty;
                    linkArgs.LinkType = LINK_TYPE.GOTO;
                    linkArgs.PageIndex = annotCommand.PageIndex;
                    //linkArgs.InvokeLinkSaveCalled(this, EventArgs.Empty);
                    this.IsCreateLink = true;
                    AnnotHandlerEventArgs annotArgs = toolContentViewModel.GetLink(linkArgs);
                    PDFViewer.SetMouseMode(MouseModes.AnnotCreate);
                    PDFViewer.SetToolParam(annotArgs);
                    this.IsPropertyOpen = true;

                }
            }
        }

        private void ShowInFolder()
        {
            CommonHelper.ShowFileBrowser(PDFViewer.Document.FilePath);
        }

        private void property()
        {
            DialogParameters valuePairs = new DialogParameters();
            valuePairs.Add(ParameterNames.PDFDocument, PDFViewer.Document);
            dialogs.ShowDialog(DialogNames.PropertyDialog, valuePairs, null);
        }

        private void share()
        {
            try
            {
                var path = PDFViewer.Document.FilePath;
                string subject = "分享至" + " " + PDFViewer.Document.FileName;
                System.Diagnostics.Process.Start("outlook", "/a,\"" + path + "\"" + "/m \"" + "&subject=" + subject + "\"");
            }
            catch
            {
                AlertsMessage alertsMessage = new AlertsMessage();
                alertsMessage.ShowDialog("", "未检测到Ooutlook软件,请先安装Outlook", "OK");
            }
        }

        private void SettingsEvent()
        {
            dialogs.ShowDialog(DialogNames.SettingsDialog, null, null);
        }

        private bool CanSaveExcute()
        {
            return CanSave;
        }

        private void MenuEnterReadModeEvent(object obj)
        {
        }

        public void ShowPrintDialog()
        {
            DialogParameters printValue = new DialogParameters();
            printValue.Add(ParameterNames.PDFViewer, PDFViewer);
            printValue.Add(ParameterNames.FilePath, PDFViewer.Document.FileName);
            printValue.Add(ParameterNames.PrintCurrentPage, PDFViewer.CurrentIndex);
            dialogs.ShowDialog(DialogNames.HomePagePrinterDialog, printValue, e => { });
        }

        private void InitialregionNameByTabItem(ref Dictionary<string, string> dictionary)
        {
            dictionary.Add("TabItemPageEdit", ToolContentRegionName);
            dictionary.Add("TabItemTool", ToolsBarContentRegionName);
            //其他工具菜单栏共用一个ToolsBarContentRegionName
            dictionary.Add("TabItemAnnotation", ToolsBarContentRegionName);
            dictionary.Add("TabItemConvert", ConverterBarContentRegionName);
            dictionary.Add("TabItemScan", ToolsBarContentRegionName);
            dictionary.Add("TabItemEdit", TextEditContentRegionName);
            dictionary.Add("TabItemForm", ToolsBarContentRegionName);
            dictionary.Add("TabItemFill", ToolsBarContentRegionName);
        }

        private void InitialbarContentByTabItem(ref Dictionary<string, string> dictionary)
        {
            dictionary.Add("TabItemPageEdit", "PageEditContent");
            dictionary.Add("TabItemTool", "ToolsBarContent");
            dictionary.Add("TabItemAnnotation", "AnnotToolContent");
            dictionary.Add("TabItemConvert", "ConverterBarContent");
            dictionary.Add("TabItemScan", "ScanContent");
            dictionary.Add("TabItemEdit", "TextEditToolContent");
            dictionary.Add("TabItemForm", "FormsToolContent");
            dictionary.Add("TabItemFill", "FillAndSignContent");
        }

        private void UpdateShowContent(string currentBar)
        {
            ToolContentVisible = Visibility.Collapsed;
            ToolsBarContentVisible = Visibility.Collapsed;
            ConverterBarContentVisible = Visibility.Collapsed;
            TextEditToolContentVisible = Visibility.Collapsed;
            OCRContentVisible = Visibility.Collapsed;

            switch (currentBar)
            {
                case "TabItemAnnotation":

                case "TabItemTool":
                case "TabItemForm":
                case "TabItemFill":
                    ToolsBarContentVisible = Visibility.Visible;
                    break;

                case "TabItemScan":
                    ToolsBarContentVisible = Visibility.Visible;
                    OCRContentVisible = Visibility.Visible;
                    break;

                case "TabItemEdit":
                    TextEditToolContentVisible = Visibility.Visible;
                    break;

                case "TabItemConvert":
                    ConverterBarContentVisible = Visibility.Visible;
                    break;

                case "TabItemPageEdit":
                case "HeaderFooterContent":
                case "BatesContent":
                case "WatermarkContent":
                case "BackgroundContent":
                case "RedactionContent":
                    ToolContentVisible = Visibility.Visible;
                    break;

                default:
                    break;
            }

            PDFEditMode(currentBar);
            FormMode(currentBar);
        }

        private void PDFEditMode(string currentBar)
        {
            if (currentBar == "TabItemEdit")
            {
                if (PDFViewer != null)
                {
                    PDFViewer.SetMouseMode(MouseModes.PDFEdit);
                    //SelectedPrpoertyPanel("TextEditProperty", null);
                    //IsPropertyOpen = true;
                }
            }
            else
            {
                if (PDFViewer != null && PDFViewer.MouseMode == MouseModes.PDFEdit)
                {
                    IsPropertyOpen = false;
                    PDFViewer.SetMouseMode(MouseModes.PanTool);
                }
            }
        }

        private void FormMode(string currentBar)
        {
            if (currentBar == "TabItemForm")
            {
                if (PDFViewer != null)
                {
                    PDFViewer.SetMouseMode(MouseModes.FormEditTool);
                }
            }
            else
            {
                if (PDFViewer != null && PDFViewer.MouseMode == MouseModes.FormEditTool)
                {
                    PDFViewer.SetMouseMode(MouseModes.PanTool);
                }
            }
        }

        private void UndoManager_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (!isInPageEdit)
            {
                //不处于页面编辑模式下时，根据PDFVIewer的undo redo状态来更新按钮状态
                //页面编辑模式下，按钮状态根据页面编辑的undo redo来显示
                if (e.PropertyName == "CanUndo")
                {
                    CanUndo = PDFViewer.UndoManager.CanUndo;
                }
                if (e.PropertyName == "CanRedo")
                {
                    CanRedo = PDFViewer.UndoManager.CanRedo;
                }
            }
            if (e.PropertyName == "CanSave")
            {
                CanSave = PDFViewer.UndoManager.CanSave;
            }
        }

        /// <summary>
        /// 选项卡切换事件
        /// </summary>
        /// <param name="e"></param>
        private void TabControlSelectonChangedEvent(object e)
        {
            var args = e as SelectionChangedEventArgs;
            if (args != null)
            {
                var item = args.AddedItems[0] as TabItem;
                CurrentBar = item.Name;
                if (previousBar != CurrentBar)
                {
                    if (CurrentBar == "TabItemPageEdit")//如果是页面编辑则进入页面编辑模式
                    {
                        EnterToolMode(barContentByTabItem[CurrentBar]);
                        isInPageEdit = true;
                    }
                    else//其余情况直接导航至对应的工具栏即可，不需要清空之前的content,region里是单例模式
                    {
                        EnterSelectedBar(CurrentBar);
                        isInPageEdit = false;
                    }
                    previousBar = CurrentBar;
                }
            }
        }

        /// <summary>
        /// 阅读模式
        /// </summary>
        /// <param name="viewContent"></param>
        public async void RbtnReadMode()
        {
            App.mainWindowViewModel.SelectedItem.IsInReadctonMode = true;
            App.IsBookMode = true;
            IsLoading = Visibility.Visible;
            await Task.Delay(1);
            NavigationParameters param = new NavigationParameters();
            param.Add(ParameterNames.PDFViewer, PDFViewer);
            param.Add(ParameterNames.ViewContentViewModel, this);
            region.RequestNavigate(ToolContentRegionName, "ReadViewContent", param);

            //ShowContent(CurrentBar, true);
            if (GridToolRow != 0)
            {
                GridToolRow = 0;
            }

            if (GridToolRowSpan != 4)
            {
                GridToolRowSpan = 4;
            }
            //isInPageEdit = true;
            UpdateShowContent("TabItemPageEdit");
            IsLoading = Visibility.Collapsed;
        }

        /// <summary>
        /// 退出阅读模式
        /// </summary>
        public async void UnReadModel()
        {
            App.mainWindowViewModel.SelectedItem.IsInReadctonMode = false;
            App.IsBookMode = false;
            IsLoading = Visibility.Visible;
            await Task.Delay(1);
            //PDFViewer.MouseMode = MouseModes.None;

            if (region.Regions.ContainsRegionWithName(ViwerRegionName))
            {
                if (region.Regions[ViwerRegionName].Views.Contains(PDFViewer))
                {
                    var contentRegion = region.Regions[ViwerRegionName];
                    contentRegion.Remove(PDFViewer);
                }
                region.AddToRegion(ViwerRegionName, PDFViewer);
            }
            if (string.IsNullOrEmpty(CurrentBar) || CurrentBar.Equals("TabItemPageEdit", StringComparison.OrdinalIgnoreCase))
            {
                EnterSelectedBar("TabItemAnnotation");
            }
            else
            {
                EnterSelectedBar(CurrentBar);
            }

            //isInPageEdit = false;
            //ShowContent(CurrentBar, false);
            //isInPageEdit = false;

            IsLoading = Visibility.Collapsed;
            ReadModelTip = Visibility.Visible;
            await Task.Delay(3000);
            ReadModelTip = Visibility.Collapsed;
        }

        #region PDFViewer鼠标滚轮缩放事件

        public void PdfViewer_MouseWheelZoomHandler(object sender, bool e)
        {
            double newZoom = CheckZoomLevel(PDFViewer.ZoomFactor + (e ? 0.01 : -0.01), e);
            PDFViewer.Zoom(newZoom);
        }

        private double CheckZoomLevel(double zoom, bool IsGrowth)
        {
            double standardZoom = 100;
            if (zoom <= 0.01)
            {
                return 0.01;
            }
            if (zoom >= 10)
            {
                return 10;
            }

            zoom *= 100;
            for (int i = 0; i < zoomLevel.Length - 1; i++)
            {
                if (zoom > zoomLevel[i] && zoom <= zoomLevel[i + 1] && IsGrowth)
                {
                    standardZoom = zoomLevel[i + 1];
                    break;
                }
                if (zoom >= zoomLevel[i] && zoom < zoomLevel[i + 1] && !IsGrowth)
                {
                    standardZoom = zoomLevel[i];
                    break;
                }
            }
            return standardZoom / 100;
        }

        #endregion PDFViewer鼠标滚轮缩放事件

        #region Navigate

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            if (isOpenFile)
                return;

            var mainVM = navigationContext.Parameters[ParameterNames.MainViewModel] as MainContentViewModel;
            if (mainVM != null)
            {
                mainViewModel = mainVM;
            }
            var pdfview = navigationContext.Parameters[ParameterNames.PDFViewer] as CPDFViewer;
            if (pdfview != null)
            {
                PDFViewer = pdfview;
                loadFile();
            }

            isOpenFile = true;
        }

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
        }

        #endregion Navigate

        #region 方法

        /// <summary>
        /// 视图面板  切换分屏模式
        /// </summary>
        /// <param name="mode"></param>
        public void EnterSplitMode(SplitMode mode)
        {
            ///通知UI层更改布局
            this.events.GetEvent<SplitEvent>().Publish(new SplitEventArgs() { Unicode = unicode, Mode = mode });
        }

        private void Undo()
        {
            if (isInPageEdit)
            {
                //执行页面编辑的Undo
                PageEditUndo?.Invoke();
            }
            else
            {
                PDFViewer.UndoManager.Undo();
            }
        }

        private void Redo()
        {
            if (isInPageEdit)
            {
                //执行页面编辑的Redo
                PageEditRedo?.Invoke();
            }
            else
            {
                PDFViewer.UndoManager.Redo();
            }
        }

        private void LoadControl()
        {
            //在构造函数中使用Region需要借助Dispatcher 确保UI已经加载完成,加载BOTA区域
            System.Windows.Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send, new Action(() =>
                  {
                      NavigationParameters parameters = new NavigationParameters();
                      parameters.Add(ParameterNames.PDFViewer, PDFViewer);
                      parameters.Add(ParameterNames.ViewContentViewModel, this);

                      region.RequestNavigate(BOTARegionName, "BOTAContent", parameters);
                      region.RequestNavigate(BottomToolRegionName, "BottomToolContent", parameters);
                      region.RequestNavigate(ReadModeRegionName, "ReadModeContent", parameters);
                      region.RequestNavigate(SplitViewerRegionName, "SplitScreenContent", parameters);

                      //TODO 根据上一次关闭记录的菜单，选中TabItem
                      EnterSelectedBar("TabItemAnnotation");
                  }
                  ));
        }

        /// <summary>
        /// 各个注释（选中和创建注释）导航到对应注释的属性面板
        /// </summary>
        /// <param name="Content"></param>
        /// <param name="annotPropertyPanel"></param>
        public void SelectedPrpoertyPanel(string Content, AnnotPropertyPanel annotPropertyPanel)
        {
            System.Windows.Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send, new Action(() =>
                      {
                          NavigationParameters parameters = new NavigationParameters();
                          //传其他参数：文档类，空注释面板；
                          parameters.Add(ParameterNames.PDFViewer, PDFViewer);
                          parameters.Add(ParameterNames.PropertyPanelContentViewModel, annotPropertyPanel);
                          parameters.Add(ParameterNames.ViewContentViewModel, this);
                          region.RequestNavigate(PropertyRegionName, Content, parameters);
                      }
                      ));
        }

        /// <summary>
        /// 将PDFViwer添加到Region
        /// </summary>
        private void loadFile()
        {
            PDFViewer.MouseWheelZoomHandler += PdfViewer_MouseWheelZoomHandler;
            PDFViewer.UndoManager.PropertyChanged += UndoManager_PropertyChanged;
            CanSave = PDFViewer.UndoManager.CanSave;
            CanUndo = PDFViewer.UndoManager.CanUndo;
            CanRedo = PDFViewer.UndoManager.CanRedo;
            region.AddToRegion(ViwerRegionName, PDFViewer);
        }

        /// <summary>
        /// 已有路径文档的保存逻辑
        /// </summary>
        private bool saveFile()
        {
            try
            {
                if (string.IsNullOrEmpty(PDFViewer.Document.FilePath))
                    return saveAsFile();

                //文档已被修复时 提示另存为
                if (PDFViewer.Document.HasRepaired)
                {
                    AlertsMessage alertsMessage = new AlertsMessage();
                    alertsMessage.ShowDialog("", "文件已被修复，建议另存为", "Cancel", "OK");
                    if (alertsMessage.result == ContentResult.Ok)
                        return saveAsFile();
                    else
                        return false;
                }

                //文件路径无法存在时
                if (!File.Exists(PDFViewer.Document.FilePath))
                {
                    AlertsMessage alertsMessage = new AlertsMessage();
                    alertsMessage.ShowDialog("", "文件路径不存在，需要另存为", "Cancel", "OK");
                    if (alertsMessage.result == ContentResult.Ok)
                        return saveAsFile();
                    else
                        return false;
                }

                //只读文件无法写入时，提示另存为
                FileInfo fileInfo = new FileInfo(PDFViewer.Document.FilePath);
                if (fileInfo.IsReadOnly)
                {
                    AlertsMessage alertsMessage = new AlertsMessage();
                    alertsMessage.ShowDialog("", "文件为只读文件，需要另存为", "Cancel", "OK");
                    if (alertsMessage.result == ContentResult.Ok)
                        return saveAsFile();
                    else
                        return false;
                }

                bool result = PDFViewer.Document.WriteToLoadedPath();
                if (result)
                {
                    PDFViewer.UndoManager.CanSave = false;
                    App.Current.Dispatcher.Invoke(() =>
                                  {
                                      //TODO:更新缩略图
                                      //OpenFileInfo info = SettingHelper.GetFileInfo(PdfViewer.Document.FilePath);
                                      //try
                                      //{
                                      //    if (!string.IsNullOrEmpty(info.ThumbImgPath) && !PdfViewer.Document.IsEncrypted)//加密的文档不获取缩略图
                                      //    {
                                      //        var size = PdfViewer.Document.GetPageSize(0);
                                      //        System.Drawing.Bitmap bitmap = ToolMethod.RenderPageBitmapNoWait(PdfViewer.Document, (int)size.Width, (int)size.Height, 0, true, true);
                                      //        string folderPath = System.IO.Path.Combine(App.CurrentPath, "CoverImage");
                                      //        if (File.Exists(folderPath))
                                      //            File.Delete(folderPath);
                                      //        DirectoryInfo folder = new DirectoryInfo(folderPath);
                                      //        if (!folder.Exists)
                                      //            folder.Create();
                                      //        string imagePath = info.ThumbImgPath;
                                      //        if (!File.Exists(imagePath))//由加密文档变为非加密文档时 新建一个路径
                                      //        {
                                      //            string imageName = Guid.NewGuid().ToString();
                                      //            imagePath = System.IO.Path.Combine(folderPath, imageName);
                                      //            using (FileStream stream = new FileStream(imagePath, FileMode.Create))
                                      //            {
                                      //                bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
                                      //            }
                                      //        }
                                      //        else
                                      //        {
                                      //            using (FileStream stream = new FileStream(imagePath, FileMode.Open))
                                      //            {
                                      //                bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
                                      //            }
                                      //        }
                                      //        info.ThumbImgPath = imagePath;
                                      //        SettingHelper.SetFileInfo(info);
                                      //    }
                                      //}
                                      //catch
                                      //{
                                      //    info.ThumbImgPath = null;
                                      //    SettingHelper.SetFileInfo(info);
                                      //}
                                  });
                }
                else
                {
                    //文件被占用 保存失败时
                    AlertsMessage alertsMessage = new AlertsMessage();
                    alertsMessage.ShowDialog("", "文件被占用，需要另存为", "Cancel", "OK");
                    if (alertsMessage.result == ContentResult.Ok)
                        return saveAsFile();
                    else
                        return false;
                }

                return result;
            }
            catch { return false; }
        }

        /// <summary>
        /// 另存为或新文档保存逻辑
        /// </summary>
        public bool saveAsFile(bool isApplyRedaction = false, bool isEraseRedaction = false)
        {
            var dlg = new Microsoft.Win32.SaveFileDialog();
            dlg.Filter = Properties.Resources.OpenDialogFilter;
            dlg.FileName = PDFViewer.Document.FileName;
            if (dlg.ShowDialog() == true && !string.IsNullOrEmpty(dlg.FileName))
            {
                bool result = false;
                //标记密文后的保存
                if (isApplyRedaction)
                {
                    //应用标记密文并另存为保存
                    try
                    {
                        PDFViewer.Document.ApplyRedaction();
                        PDFViewer.Document.ReleasePages();
                        PDFViewer.ReloadDocument();
                    }
                    catch { }
                }
                else if (isEraseRedaction)
                {
                    EraseReadction();
                }

                if (App.OpenedFileList.Contains(dlg.FileName))
                {
                    //提示文件已经被打开
                }
                else
                {
                    result = PDFViewer.Document.WriteToFilePath(dlg.FileName);
                    if (result)
                    {
                        DoAfterSaveAs(dlg.FileName);
                    }
                    else
                    {
                        //提示文件被其他软件占用 无法保存
                        //MessageBoxEx.Show(App.MainPageLoader.GetString("Main_TheFileOccupiedWarning"), "", Winform.MessageBoxButtons.OKCancel, new string[] { App.MainPageLoader.GetString("Main_SaveAs"), App.MainPageLoader.GetString("Main_Cancel") })
                    }
                ;
                }
                return result;
            }
            else
                return false;
        }

        private void EraseReadction()
        {
            for (int i = 0; i < PDFViewer.Document.PageCount; i++)
            {
                //获取页面Page对象
                var page = PDFViewer.Document.PageAtIndex(i);
                var annots = PDFViewer.GetAnnotCommentList(i, PDFViewer.Document);
                //循环擦除当前页的标记密文
                for (int j = 0; j < annots.Count; j++)
                {
                    if (annots[j].EventType == AnnotArgsType.AnnotRedaction)
                    {
                        foreach (var rect in (annots[j] as RedactionAnnotArgs).QuardRects)
                        {
                            page.ErasureRedaction(rect);
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 另存为后进行的操作
        /// 重新打开新文档
        /// </summary>
        /// <param name="targetPath"></param>
        public void DoAfterSaveAs(string targetPath)
        {
            App.OpenedFileList.Remove(targetPath);
            string oldFilePath = targetPath;

            PDFViewer.UndoManager.CanSave = false;

            mainViewModel.OpenFile(targetPath);
            //TODO：通知各模块更新PDFview对象
            //var result = OpenFile(targetPath, true);

            //if (result)
            //{
            //    FileChanged.Invoke(this, null);
            //    Zoomer.PdfViewer = PdfViewer;
            //    PageSelector.PdfViewer = PdfViewer;
            //    ViewModeSelector.PdfViewer = PdfViewer;

            //    OpenFileInfo fileInfo = SettingHelper.GetFileInfo(oldFilePath);
            //    if (fileInfo != null)
            //    {
            //        PdfViewer.ChangeViewMode(fileInfo.LastViewMode);
            //        PdfViewer.ChangeFitMode(fileInfo.LastFitMode);
            //        if (fileInfo.LastFitMode == FitMode.FitFree)
            //            PdfViewer.Zoom(fileInfo.LastZoom);

            //        PdfViewer.GoToPage(fileInfo.LastPageIndex);
            //        if (fileInfo.LastDrawMode == DrawModes.Draw_Mode_Custom && fileInfo.LastFillColor != 0)
            //            PdfViewer.SetDrawMode(fileInfo.LastDrawMode, fileInfo.LastFillColor);
            //        else
            //            PdfViewer.SetDrawMode(fileInfo.LastDrawMode);
            //    }
            //}
        }

        /// <summary>
        /// 显示前添加内容到Region
        /// </summary>
        /// <param name="isPageEdit"></param>
        private void ShowContent(string currentBar, bool isToolMode = false)
        {
            GridVisibility = Visibility.Visible;
            //显示页面编辑或其他工具
            if (currentBar == "TabItemPageEdit" || isToolMode)
            {
                if (currentBar == "TabItemPageEdit")//进入页面编辑
                {
                    if (GridToolRow != 1)
                    {
                        GridToolRow = 1;
                    }

                    if (GridToolRowSpan != 3)
                    {
                        GridToolRowSpan = 3;
                    }
                }
                else//进入水印等其他工具模式
                {
                    GridVisibility = Visibility.Collapsed;
                    if (GridToolRow != 0)
                    {
                        GridToolRow = 0;
                    }

                    if (GridToolRowSpan != 4)
                    {
                        GridToolRowSpan = 4;
                    }
                }
                //ToolContent的visible跟toolsbarContent 的visible是互斥的
                UpdateShowContent(currentBar);
            }
            else
            {
                if (GridToolRow != 1)
                {
                    GridToolRow = 1;
                }
                UpdateShowContent(currentBar);
            }
        }

        /// <summary>
        /// 从二级工具栏进入需要修改界面布局的场景
        /// </summary>
        /// <param name="EditToolName"></param>
        private void EnterEditTools(StringWithUnicode EditToolName)
        {
            EnterSelectedEditTool(EditToolName);
        }

        private void CloseEditTool(EnumCloseModeUnicode enumCloseModeunicode)
        {
            EnumCloseMode enumCloseMode = enumCloseModeunicode.Status;
            if (enumCloseMode == EnumCloseMode.StatusConfirm)
            {
                PDFViewer.Document.ReleasePages();
                PDFViewer.ReloadDocument();
            }

            //如果是其他工具共用一个PDFview,退出工具模式后，需要重新添加到Region，否则不会显示
            if (!region.Regions[ViwerRegionName].Views.Contains(PDFViewer))
            {
                region.AddToRegion(ViwerRegionName, PDFViewer);
            }

            CurrentBar = "TabItemTool";
            EnterSelectedBar(CurrentBar);
        }

        /// <summary>
        /// 二级菜单指定目标处理
        /// </summary>
        /// <param name="e"></param>
        private void EnterSelectedEditTool(StringWithUnicode EditToolName)
        {
            CurrentBar = EditToolName.EditToolsContentName;
            EnterToolMode(CurrentBar);
        }

        /// <summary>
        /// 进入工具编辑(如页面编辑、水印、密文等)模式
        /// </summary>
        /// <param name="targetToolMode">要导航过去的控件名称</param>
        /// <param name="valuePairs">导航需要传送的参数，为空时，默认传送PDFView和ViewContentViewModel</param>
        private async void EnterToolMode(string targetToolMode, NavigationParameters valuePairs = null)
        {
            IsLoading = Visibility.Visible;
            await Task.Delay(3);
            NavigationParameters param = new NavigationParameters();
            if (valuePairs == null)
            {
                param.Add(ParameterNames.PDFViewer, PDFViewer);
                param.Add(ParameterNames.ViewContentViewModel, this);
            }
            else//有传入其他内容的参数时
            {
                param = valuePairs;
            }
            region.RequestNavigate(ToolContentRegionName, targetToolMode, param);
            ShowContent(CurrentBar, true);

            IsLoading = Visibility.Collapsed;
        }

        private void EnterSelectedBar(string currentBar)
        {
            NavigationParameters param = new NavigationParameters();
            param.Add(ParameterNames.PDFViewer, PDFViewer);
            param.Add(ParameterNames.ViewContentViewModel, this);
            region.RequestNavigate(regionNameByTabItem[currentBar], barContentByTabItem[currentBar], param);
            if (currentBar == "TabItemScan")
            {
                region.RequestNavigate(RegionNames.OCRViewerRegionName, "ScanViwer", param);
            }
            ShowContent(currentBar);
        }

        /// <summary>
        /// 退出工具(水印、密文等)编辑模式，隐藏ToolContent
        /// </summary>
        public void ExitToolMode()
        {
            ToolContentVisible = Visibility.Collapsed;
            if (isInPageEdit)
            {
                TabSelectedIndex = 0;
                isInPageEdit = false;
            }
        }

        #endregion 方法
    }
}