PDFOffice_Windows_exe/PDF Office/ViewModels/EditTools/Redaction/RedactionContentViewModel.cs

using ComPDFKit.Import;
using ComPDFKit.PDFAnnotation;
using ComPDFKit.PDFPage;
using ComPDFKitViewer;
using ComPDFKitViewer.AnnotEvent;
using ComPDFKitViewer.PdfViewer;
using PDF_Office.CustomControl;
using PDF_Office.EventAggregators;
using PDF_Office.Model;
using PDF_Office.Properties;
using Prism.Commands;
using Prism.Events;
using Prism.Mvvm;
using Prism.Regions;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Media;

namespace PDF_Office.ViewModels.EditTools.Redaction
{
    public class RedactionContentViewModel : BindableBase,INavigationAware
    {
        public IEventAggregator eventAggregator;

        public IRegionManager redactionRegion;

        public IDialogService dialogs;

        private CPDFViewer PDFViewer;

        private ViewContentViewModel viewContentViewModel;

        private RedactionAnnotArgs redactionArgs = new RedactionAnnotArgs();

        public string RedactionDocumentRegionName { get; set; }
        public string RedactionBottomBarRegionName { get; set; }

        public string RedactionDocumentName = "RedactionDocumentContent";

        public string Unicode = null;

        public DelegateCommand CloseEditToolCommand { get; set; }

        public DelegateCommand ApplyCommmand { get; set; }

        public DelegateCommand RemoveCommand { get; set; }

        public DelegateCommand PageRedactionCommand { get; set; }

        private int currentPage = 0;

        /// <summary>
        /// 是否因为本身传递值  防止循环调用
        /// </summary>
        private bool isFromSelf = false;

        public int CurrentPage
        {
            get { return currentPage; }
            set
            {
                SetProperty(ref currentPage, value);
                if(value>=1&&value<=PDFViewer.Document.PageCount&&!isFromSelf)
                {
                    PDFViewer.GoToPage(value-1);
                }
            }
        }

        private int pageCount = 0;

        public int PageCount
        {
            get { return pageCount; }
            set
            {
                SetProperty(ref pageCount, value);
            }
        }


        public RedactionContentViewModel(IRegionManager regionManager, IEventAggregator eventAggregator,IDialogService dialogService)
        {
            this.redactionRegion = regionManager;
            this.eventAggregator = eventAggregator;
            this.dialogs = dialogService;

            RedactionDocumentRegionName = Guid.NewGuid().ToString();
            Unicode = App.mainWindowViewModel.SelectedItem.Unicode;
            CloseEditToolCommand = new DelegateCommand(CloseEditTool);
            ApplyCommmand = new DelegateCommand(apply);
            RemoveCommand = new DelegateCommand(remove);
            PageRedactionCommand = new DelegateCommand(pageMark);
        }

        /// <summary>
        /// 应用
        /// </summary>
        private void apply()
        {
            AlertsMessage alertsMessage = new AlertsMessage();
            alertsMessage.ShowDialog("Apply Redactions", "Use blank blocks to remove selected sensitive content."+

"This action will permanently delete the marked ciphertext information from this document and you will not be able to retrieve the marked ciphertext information.","Cancel","Apply & Save As");
            if(alertsMessage.result== ContentResult.Ok)
            {
                viewContentViewModel.saveAsFile(true);
            }
        }

        /// <summary>
        /// 擦除
        /// </summary>
        private void remove()
        {

        }

        private void pageMark()
        {
            DialogParameters valuePairs = new DialogParameters();
            valuePairs.Add(ParameterNames.PageCount,PDFViewer.Document.PageCount);
            valuePairs.Add(ParameterNames.CurrentPageIndex,PDFViewer.CurrentIndex);
            dialogs.ShowDialog(DialogNames.PageMarkDialog,valuePairs,e=> { 
                if(e.Result == ButtonResult.OK)
                {
                    var pagelist = e.Parameters.GetValue<List<int>>(ParameterNames.PageList);
                    addMarkToPages(pagelist);
                }
            });
        }

        private void addMarkToPages(List<int> list)
        {
            foreach (var page in list)
            {

                //根据页面大小，创建标记密文注释
                CPDFPage docPage = PDFViewer.Document.PageAtIndex(page);

                CPDFRedactAnnotation redactionAnnot = docPage.CreateAnnot(C_ANNOTATION_TYPE.C_ANNOTATION_REDACT) as CPDFRedactAnnotation;
                if (redactionAnnot == null)
                {
                    //TODO 操作失败
                    return;
                }

                redactionAnnot.SetQuardRects(new List<CRect>() { new CRect(0, (float)docPage.PageSize.Height, (float)docPage.PageSize.Width,0)});

                if (redactionArgs == null)
                    return;

                byte[] lineColor = { redactionArgs.LineColor.R, redactionArgs.LineColor.G, redactionArgs.LineColor.B };
                redactionAnnot.SetOutlineColor(lineColor);

                if (redactionArgs.BgColor != Colors.Transparent)
                {
                    byte[] bgColor = { redactionArgs.BgColor.R, redactionArgs.BgColor.G, redactionArgs.BgColor.B };
                    redactionAnnot.SetFillColor(bgColor);
                }
                else
                {
                    // redactionAnnot.ClearBgColor();
                }

                CTextAttribute textAttr = new CTextAttribute();
                byte[] fontColor = { redactionArgs.FontColor.R, redactionArgs.FontColor.G, redactionArgs.FontColor.B };
                textAttr.FontColor = fontColor;
                textAttr.FontSize = (float)redactionArgs.FontSize;
                redactionAnnot.SetTextAttribute(textAttr);
                switch (redactionArgs.Align)
                {
                    case TextAlignment.Left:
                        redactionAnnot.SetTextAlignment(C_TEXT_ALIGNMENT.ALIGNMENT_LEFT);
                        break;
                    case TextAlignment.Center:
                        redactionAnnot.SetTextAlignment(C_TEXT_ALIGNMENT.ALIGNMENT_CENTER);
                        break;
                    case TextAlignment.Right:
                        redactionAnnot.SetTextAlignment(C_TEXT_ALIGNMENT.ALIGNMENT_RIGHT);
                        break;
                    default:
                        redactionAnnot.SetTextAlignment(C_TEXT_ALIGNMENT.ALIGNMENT_LEFT);
                        break;
                }

                //byte transparency = (byte)Math.Round(redactionArgs.Transparency * 255);
                //redactionAnnot.SetTransparency(transparency);
                redactionAnnot.SetBorderWidth(1);
                //redactionAnnot.SetRect(new CRect(Left, Bottom, Right, Top));

                //redactionAnnot.SetCreationDate(Helpers.GetCurrentPdfTime());
                if (string.IsNullOrEmpty(Settings.Default.AppProperties.Description.Author))
                {
                    redactionAnnot.SetAuthor(Settings.Default.AppProperties.Description.Author);
                }

                if (redactionArgs.Content != null && redactionArgs.Content != string.Empty)
                {
                    redactionAnnot.SetOverlayText(redactionArgs.Content);
                }

                if (redactionAnnot.GetIsLocked() != redactionArgs.Locked)
                {
                    redactionAnnot.SetIsLocked(redactionArgs.Locked);
                }

                redactionAnnot.UpdateAp();
                redactionAnnot.ReleaseAnnot();
            }
        }



        public void CloseEditTool()
        {
            bool isClose = true;
            if (CheckHasRedactionAnnote())
            {
                AlertsMessage alertsMessage = new AlertsMessage();
                alertsMessage.ShowDialog("", "There are unapplied redactions in this file. Exit will not save redaction.", "Cancel", "Exit");
                if (alertsMessage.result != ContentResult.Ok)
                {
                    isClose = false;
                }
            }

            if(isClose)
            {
                PDFViewer.SetMouseMode(MouseModes.Default);
                redactionRegion.Regions[RegionNames.ViwerRegionName].Remove(PDFViewer);
                redactionRegion.Regions[RedactionDocumentRegionName].Remove(PDFViewer);
                this.eventAggregator.GetEvent<CloseEditToolEvent>().Publish(new EnumCloseModeUnicode { Unicode = this.Unicode, Status = EnumCloseMode.StatusCancel });
            }
        }

        /// <summary>
        /// 检查是否有未应用的标记密文
        /// </summary>
        private bool CheckHasRedactionAnnote()
        {
            for (int i = 0; i < PDFViewer.Document.PageCount; i++)
            {
                var items = PDFViewer.GetAnnotCommentList(i, PDFViewer.Document);
                for (int j = 0; j < items.Count; j++)
                {
                    if (items[j].EventType == AnnotArgsType.AnnotRedaction)
                    {
                        return true;
                    }
                }
            }
            return false;
        }
        #region Navigation

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

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            navigationContext.Parameters.TryGetValue<CPDFViewer>(ParameterNames.PDFViewer, out PDFViewer);
            navigationContext.Parameters.TryGetValue<ViewContentViewModel>(ParameterNames.ViewContentViewModel, out viewContentViewModel);
            PDFViewer.InfoChanged += PDFViewer_InfoChanged;
            CurrentPage = PDFViewer.CurrentIndex + 1;
            PageCount = PDFViewer.Document.PageCount;
            if (!redactionRegion.Regions[RedactionDocumentRegionName].Views.Contains(PDFViewer))
            {
                redactionArgs = new RedactionAnnotArgs();
                AnnotHandlerEventArgs annotArgs = null;
                redactionArgs.LineColor = Settings.Default.RedactionsSettings.LineColor;
                redactionArgs.BgColor = Settings.Default.RedactionsSettings.BgColor;
                redactionArgs.FontColor = Settings.Default.RedactionsSettings.FontColor;
                redactionArgs.Align = Settings.Default.RedactionsSettings.Align;
                redactionArgs.FontSize = Settings.Default.RedactionsSettings.FontSize;
                redactionArgs.Content = Settings.Default.RedactionsSettings.Content;
                if (!Settings.Default.RedactionsSettings.isUseText)
                {
                    redactionArgs.Content = "";
                }
                annotArgs = redactionArgs;
                if (annotArgs != null)
                {
                    //设置注释作者
                    annotArgs.Author = Settings.Default.AppProperties.Description.Author;
                    PDFViewer.SetMouseMode(MouseModes.AnnotCreate);
                    PDFViewer.SetToolParam(annotArgs);
                }
                redactionRegion.AddToRegion(RedactionDocumentRegionName, PDFViewer);
            }
  
        }

        private void PDFViewer_InfoChanged(object sender, KeyValuePair<string, object> e)
        {
            isFromSelf = true;
           if(e.Key=="PageNum")
            {
                var data = e.Value as RenderData;
                CurrentPage = data.PageIndex;
            }
            isFromSelf = false;
        }
        #endregion
    }
}