PDFOffice_Windows_exe/PDF Office/ViewModels/EditTools/Watermark/WatermarkDocumentContentViewModel.cs

using ComPDFKitViewer.PdfViewer;
using PDF_Office.EventAggregators;
using PDF_Office.Model.EditTools.Background;
using PDF_Office.Model;
using Prism.Commands;
using Prism.Events;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Linq;
using PDF_Office.Model.EditTools.Watermark;
using ComPDFKit.PDFDocument;
using ComPDFKit.PDFPage;
using System.Windows.Media.Imaging;
using System.Windows.Media;
using System.Threading.Tasks;
using ComPDFKit.PDFWatermark;
using PDF_Office.Helper;
using PDF_Office.Model.Dialog.HomePageToolsDialogs.HomePagePrinter;
using System.Drawing;
using System.Windows;
using ComPDFKitViewer;
using Size = System.Windows.Size;

namespace PDF_Office.ViewModels.EditTools.Watermark
{
    public class WatermarkDocumentContentViewModel : BindableBase, INavigationAware
    {

        public IEventAggregator eventAggregator;
        public IRegionManager regionManager;
        public CPDFViewer PDFViewer;
        public CPDFDocument Document;
        private CPDFWatermark watermark;
        private WatermarkInfo watermarkInfo;


        public bool firstin = true;

        public string ViwerRegionName { get; set; }

        private ImageSource _imageSource = null;
        public ImageSource ImageSource
        {
            get { return _imageSource; }
            set
            {
                SetProperty(ref _imageSource, value);
            }
        }

        public WatermarkDocumentContentViewModel(IEventAggregator eventAggregator, IRegionManager regionManager)
        {
            this.regionManager = regionManager;
            this.eventAggregator = eventAggregator;
            eventAggregator.GetEvent<SetWatermarkEvent>().Subscribe(SetWatermark);
            ViwerRegionName = RegionNames.WatermarkViwerRegionName;

        }

        public void SetWatermark(WatermarkInfo watermarkInfo)
        {
            this.watermarkInfo = watermarkInfo;

            //document.PdfToImage("0-1", "D:\\");
            //document.WriteToFilePath("D:\\sb22222.pdf");
            PDFViewer.InvalidateVisual();
        }

        public void CreateWatermark(CPDFDocument document)
        {
            if (watermarkInfo != null)
            {
                document.DeleteWatermarks();
                if (watermarkInfo.WatermarkType == C_Watermark_Type.WATERMARK_TYPE_TEXT)
                {
                    watermark = document.InitWatermark(C_Watermark_Type.WATERMARK_TYPE_TEXT);
                    watermark.SetText(watermarkInfo.Text);
                    if (watermarkInfo.TextSize == null)
                    {
                        watermarkInfo.TextSize = "6";
                    }
                    watermark.SetFontName(watermarkInfo.FontName);
                    watermark.SetScale(float.Parse(watermarkInfo.TextSize));
                    watermark.SetTextRGBColor(watermarkInfo.TextColor);
                }
                else
                {
                    watermark = document.InitWatermark(C_Watermark_Type.WATERMARK_TYPE_IMG);
                    watermark.SetImage(watermarkInfo.ImageArray, watermarkInfo.ImageWidth, watermarkInfo.ImageHeight);
                    watermark.SetScale(0.1f);
                }
                watermark.SetRotation(watermarkInfo.Rotation);
                watermark.SetOpacity(watermarkInfo.Opacity);
                watermark.SetFront(watermarkInfo.IsFront);
                watermark.SetVertalign(watermarkInfo.WatermarkVertalign);
                watermark.SetHorizalign(watermarkInfo.WatermarkHorizalign);
                watermark.SetFullScreen(watermarkInfo.Isfull);
                watermark.SetVertOffset(watermarkInfo.VertOffset);
                watermark.SetHorizOffset(watermarkInfo.HorizOffset);
                watermark.SetHorizontalSpacing(watermarkInfo.HorizontalSpacing);
                watermark.SetVerticalSpacing(watermarkInfo.VerticalSpacing);
                watermark.SetPages(watermarkInfo.PageRange);
                watermark.CreateWatermark();
                watermark.UpdateWatermark();
            }
        }

        public BitmapSource ToBitmapSource(System.Drawing.Bitmap image)
        {
            IntPtr ptr = image.GetHbitmap();//obtain the Hbitmap
            BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap
            (
                ptr,
                IntPtr.Zero,
                Int32Rect.Empty,
                System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions()
            );

            return bs;
        }

        public async Task RenderBitmap(CPDFDocument doc)
        {

            CPDFPage page = doc.PageAtIndex(0, true);
            byte[] bmp_data = new byte[(int)page.PageSize.Width * (int)page.PageSize.Height * 4];
            Bitmap bitmap = await ToolMethod.RenderPageBitmap(Document, (int)(page.PageSize.Width * 1 * 1.4), (int)(page.PageSize.Height * 1 * 1.4), 0, true, true);
            ImageSource = ToBitmapSource(bitmap);
            doc.ReleasePages();

        }

        private void UndoManager_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
        }

        private void CurrentViewer_CustomDrawHandler(object sender, CustomDrawData e)
        {
            if (e.DrawPages.Count > 0 && e.DrawContext != null)
            {
                foreach (DrawPageData drawPageData in e.DrawPages)
                {
                    WriteableBitmap waterMarkBitmap = GetWaterMark(PDFViewer.Document, e.Zoom, drawPageData.PageIndex);
                    e.DrawContext.DrawImage(waterMarkBitmap, drawPageData.PageBound);
                }
            }
        }
        private WriteableBitmap GetWaterMark(CPDFDocument oldDoc, double zoom, int pageIndex)
        {
            Size pageSize = oldDoc.GetPageSize(pageIndex);

            CPDFDocument newDoc = CPDFDocument.CreateDocument();
            newDoc.InsertPage(0, pageSize.Width, pageSize.Height, null);

            CreateWatermark(newDoc);
            CPDFPage newPage = newDoc.PageAtIndex(0);
            double scale = 96.0 / 72.0;
            zoom = zoom * scale;
            Rect renderRect = new Rect(0, 0, (int)(pageSize.Width * scale), (int)(pageSize.Height * scale));
            byte[] imageArray = new byte[(int)(renderRect.Width * renderRect.Height * 4)];

            newPage.RenderPageBitmapWithMatrix((float)zoom, renderRect, 0x00FFFFFF, imageArray, 1, true);
            WriteableBitmap WirteBitmap = new WriteableBitmap((int)renderRect.Width, (int)renderRect.Height, 96, 96, PixelFormats.Bgra32, null);
            WirteBitmap.WritePixels(new Int32Rect(0, 0, (int)renderRect.Width, (int)renderRect.Height), imageArray, WirteBitmap.BackBufferStride, 0);
            return WirteBitmap;
        }

        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);
            if (PDFViewer != null)
            {
                Document = PDFViewer.Document;
                if (!regionManager.Regions[ViwerRegionName].Views.Contains(PDFViewer))
                {
                    PDFViewer.CustomDrawHandler += CurrentViewer_CustomDrawHandler;
                    PDFViewer.UndoManager.PropertyChanged += UndoManager_PropertyChanged;
                    regionManager.AddToRegion(ViwerRegionName, PDFViewer);
                    PDFViewer.SetAnnotInteraction(!PDFViewer.GetAnnotInteraction());


                }

            }
        }
    }
}