kmpdfkit_demo/Demo/Examples/Compdfkit_Tools/DigitalSignature/FillDigitalSignatureControl/FillDigitalSignatureControl.xaml.cs

using ComPDFKit.Import;
using ComPDFKit.PDFAnnotation;
using ComPDFKit.PDFAnnotation.Form;
using ComPDFKit.PDFDocument;
using ComPDFKit.PDFPage;
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Media.Media3D;

namespace Compdfkit_Tools.PDFControl
{
    /// <summary>
    /// CPDFSignControl.xaml 的交互逻辑
    /// </summary>
    public partial class FillDigitalSignatureControl : UserControl
    {
        private Dictionary<string, Border> TabDict { get; set; }

        private SignatureConfig tempSignatureConfig = new SignatureConfig();

        private string _filePath = string.Empty;
        public string FilePath
        {
            get => _filePath;
            set
            {
                _filePath = value;
            }
        }

        public FillDigitalSignatureControl()
        {
            InitializeComponent();
            TabDict = new Dictionary<string, Border>
            {
                ["Keyboard"] = KeyboardBorder,
                ["Trackpad"] = TrackpadBorder,
                ["Image"] = ImageBorder,
                ["None"] = NoneBorder
            };
            SetCheckedTab("Keyboard");

            CreateTempSignature();
        }

        private void CreateTempSignature()
        {
            CPDFDocument tempDocument = CPDFDocument.CreateDocument();
            tempDocument.InsertPage(0, 200, 200, null);
            CPDFPage page = tempDocument.PageAtIndex(0);
            CPDFSignatureWidget signatureWidget = page.CreateWidget(C_WIDGET_TYPE.WIDGET_SIGNATUREFIELDS) as CPDFSignatureWidget;
            signatureWidget.SetRect(new CRect(0, 100, 100, 0));
            signatureWidget.UpdataApWithSignature(tempSignatureConfig);
            signatureWidget.UpdateFormAp();
            //if(signatureWidget.UpdateApWithImage("C:\\Users\\dkan\\Pictures\\Screenshots\\hao.jpg", "", 0))
            //{
            //    signatureWidget.UpdateAp();
            //}
            byte[] signatureBitmapBytes = GetTempSignatureImage(signatureWidget, out int width, out int height);
            tempDocument.WriteToFilePath("E:\\testfile1.pdf");

            signatureWidget.ReleaseAnnot();
             
            if (signatureBitmapBytes.Length > 0)
            {
                PixelFormat fmt = PixelFormats.Bgra32;
                BitmapSource bps = BitmapSource.Create(width, height, 96, 96, fmt, null, signatureBitmapBytes, (width * fmt.BitsPerPixel + 7) / 8);
                imageControl.Source = bps; 
            }
            else
            {
                imageControl.Source = null;
            } 
        }

        public static byte[] GetTempSignatureImage(CPDFSignatureWidget signatureWidget, out int width, out int height)
        {
            CRect rect = signatureWidget.GetRect();

            var flags = BindingFlags.NonPublic | BindingFlags.Static;
            var dpiProperty = typeof(SystemParameters).GetProperty("Dpi", flags);
            int dpi = (int)dpiProperty.GetValue(null, null);

            width = (int)(rect.width() * dpi / 72D * 2);
            height = (int)(rect.height() * dpi / 72D * 2);

            byte[] imageData = new byte[width * height * 4];
            signatureWidget.RenderAnnot(width, height, imageData, CPDFAppearanceType.Normal);

            return imageData;
        }

        private void TextAlignBtn_Click(object sender, RoutedEventArgs e)
        {
            ToggleButton checkBtn = sender as ToggleButton;
            if (checkBtn == null)
            {
                return;
            }
            checkBtn.IsChecked = true;
            if (checkBtn != TextAlignLeftBtn)
            {
                TextAlignLeftBtn.IsChecked = false;
            }
            if (checkBtn != TextAlignRightBtn)
            {
                TextAlignRightBtn.IsChecked = false;
            }
        }

        private void Border_MouseDown(object sender, MouseButtonEventArgs e)
        {
            Border clickBorder = sender as Border;
            if (clickBorder == null || clickBorder.Tag == null)
            {
                return;
            }
            SetCheckedTab(clickBorder.Tag.ToString());
            ImagePickPanel.Visibility = Visibility.Hidden;
            if (clickBorder == TrackpadBorder)
            {
                CanvaDrawPopup.Visibility = Visibility.Visible;
            }

            if (clickBorder == ImageBorder)
            {
                ImagePickPanel.Visibility = Visibility.Visible;
            }
        }

        private void SetCheckedTab(string tab)
        {
            if (TabDict != null && TabDict.ContainsKey(tab))
            {
                foreach (string key in TabDict.Keys)
                {
                    Border checkBorder = TabDict[key];
                    if (checkBorder == null)
                    {
                        continue;
                    }

                    checkBorder.BorderThickness = new Thickness(0);
                    if (key == tab)
                    {
                        checkBorder.BorderThickness = new Thickness(0, 0, 0, 2);
                    }
                }
            }
        }

        private void CanvasPopupClose_Click(object sender, RoutedEventArgs e)
        {
            CanvaDrawPopup.Visibility = Visibility.Collapsed;
        }

        private void CanvasClearBtn_Click(object sender, RoutedEventArgs e)
        {
            DrawInkCanvas.Strokes.Clear();
        }

        public void GetDrawInk()
        {
            if (DrawInkCanvas != null && DrawInkCanvas.Strokes != null && DrawInkCanvas.Strokes.Count > 0)
            {
                Rect bound = DrawInkCanvas.Strokes.GetBounds();
                DrawingVisual drawVisual = new DrawingVisual();
                DrawingContext drawContext = drawVisual.RenderOpen();

                foreach (Stroke drawStroke in DrawInkCanvas.Strokes)
                {
                    Pen drawPen = new Pen(new SolidColorBrush(drawStroke.DrawingAttributes.Color), drawStroke.DrawingAttributes.Width);
                    PathGeometry drawPath = new PathGeometry();
                    PathFigureCollection Figures = new PathFigureCollection();
                    PathFigure AddFigure = new PathFigure();
                    Figures.Add(AddFigure);
                    drawPath.Figures = Figures;

                    if (drawStroke.StylusPoints.Count > 1)
                    {
                        StylusPoint startPoint = drawStroke.StylusPoints[0];
                        AddFigure.StartPoint = new Point(startPoint.X - bound.X, startPoint.Y - bound.Y);
                        for (int i = 1; i < drawStroke.StylusPoints.Count; i++)
                        {
                            StylusPoint drawPoint = drawStroke.StylusPoints[i];
                            Point offsetPoint = new Point(drawPoint.X - bound.X, drawPoint.Y - bound.Y);
                            LineSegment drawSegment = new LineSegment();
                            drawSegment.Point = offsetPoint;
                            AddFigure.Segments.Add(drawSegment);
                        }
                    }

                    if (AddFigure.Segments.Count > 0)
                    {
                        drawContext.DrawGeometry(null, drawPen, drawPath);
                    }
                }
                drawContext.Close();

                RenderTargetBitmap renderBitmap = new RenderTargetBitmap((int)bound.Width, (int)bound.Height, 96, 96, PixelFormats.Pbgra32);
                renderBitmap.Render(drawVisual);
            }
        }

        private void ReasonCheckBox_Click(object sender, RoutedEventArgs e)
        {
            CheckBox checkItem = sender as CheckBox;
            if (checkItem == null)
            {
                return;
            }

            ReasonPanel.Visibility = checkItem.IsChecked == true ? Visibility.Visible : Visibility.Collapsed;
        }
    }
}