PDFOffice_Windows_exe/PDF Office/ViewModels/Dialog/SignatureCreateDialogViewModel.cs

using ComPDFKitViewer.AnnotEvent;
using ComPDFKitViewer.PdfViewer;
using Microsoft.Win32;
using PDF_Master.Model;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Regions;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Drawing;
using System.Drawing.Imaging;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Ink;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace PDF_Master.ViewModels.PropertyPanel.AnnotPanel
{
    class SignatureCreateDialogViewModel : BindableBase, IDialogAware
    {
        /// <summary>
        /// 非绘制时展示的画笔光标
        /// </summary>
        private const double StrokeWidth = 3;
        private const double StrokeHigh = 3;
        public string Title => "";
        private CPDFViewer PDFViewer;
        public event Action<IDialogResult> RequestClose;
        public DelegateCommand CancelCommand { get; set; }

        public DelegateCommand CreateCommnad { get; set; }
        public DelegateCommand UpdataDrawingStrokesCommnad { get; set; }

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

        public DelegateCommand OpenImageCommnad { get; set; }
        public DelegateCommand ClearTextCommnad { get; set; }
        public DelegateCommand ClearInkCanvasCommnad { get; set; }
        public ObservableCollection<string> FontNameList { get; set; }
        public ObservableCollection<string> ThicknessList { get; set; }

        private int fontNameIndex = 0;

        public int FontNameIndex
        {
            get { return fontNameIndex; }
            set
            {
                SetProperty(ref fontNameIndex, value);
            }
        }



        private int radioButtonIndex = 1;

        public int RadioButtonIndex
        {
            get { return radioButtonIndex; }
            set
            {
                SetProperty(ref radioButtonIndex, value);
            }
        }


        private int tabItemIndex;

        public int TabItemIndex
        {
            get { return tabItemIndex; }
            set
            {
                SetProperty(ref tabItemIndex, value);
            }
        }

        private string inputText = "";

        public string InputText
        {
            get { return inputText; }
            set
            {
                SetProperty(ref inputText, value);
            }
        }


        private Visibility showTextButton = Visibility.Collapsed;
        public Visibility ShowTextButton
        {
            get { return showTextButton; }
            set
            {
                SetProperty(ref showTextButton, value);
            }
        }


        private Visibility showImageButton = Visibility.Visible;
        public Visibility ShowImageButton
        {
            get { return showImageButton; }
            set
            {
                SetProperty(ref showImageButton, value);
            }
        }
        private BitmapSource imagePreviewSource;
        public BitmapSource ImagePreviewSource
        {
            get { return imagePreviewSource; }
            set
            {
                SetProperty(ref imagePreviewSource, value);
            }
        }
        private bool issRemoveBackground;

        public bool IsRemoveBackground
        {
            get { return issRemoveBackground; }
            set
            {
                SetProperty(ref issRemoveBackground, value);
                if (issRemoveBackground)
                {
                    if (IsNewFile)
                    {
                        removeBackgroundImagePreviewSource = ToBitmapImage(KnockOutGzf());
                    }
                    ImagePreviewSource = removeBackgroundImagePreviewSource;
                }
                else
                {
                    ImagePreviewSource = originalimagePreviewSource;
                }
            }
        }

        private DrawingAttributes drawingAttributes;

        public DrawingAttributes DrawingAttributeObject
        {
            get { return drawingAttributes; }
            set
            {
                SetProperty(ref drawingAttributes, value);
            }
        }


        private StrokeCollection strokes;

        public StrokeCollection StrokesObject
        {
            get { return strokes; }
            set
            {
                SetProperty(ref strokes, value);
            }
        }

        private bool isMouseDown = false;

        public bool IsMouseDown
        {
            get { return isMouseDown; }
            set
            {
                SetProperty(ref isMouseDown, value);
            }
        }


        private Visibility showPlanGrid = Visibility.Visible;

        public Visibility ShowPlanGrid
        {
            get { return showPlanGrid; }
            set
            {
                SetProperty(ref showPlanGrid, value);
            }
        }

        private int imageRadioButtonIndex = 1;

        public int ImageRadioButtonIndex
        {
            get { return imageRadioButtonIndex; }
            set
            {
                SetProperty(ref imageRadioButtonIndex, value);
                switch (imageRadioButtonIndex)
                {
                    case 1:
                        DrawingAttributeObject.Color = System.Windows.Media.Color.FromArgb(0xFF, 0x25, 0x26, 0x29);
                        break;
                    case 2:
                        DrawingAttributeObject.Color = System.Windows.Media.Color.FromArgb(0xFF, 0xF3, 0x46, 0x5B);
                        break;
                    case 3:
                        DrawingAttributeObject.Color = System.Windows.Media.Color.FromArgb(0xFF, 0x27, 0x3C, 0x62);
                        break;
                    case 4:
                        DrawingAttributeObject.Color = System.Windows.Media.Color.FromArgb(0xFF, 0x94, 0x98, 0x9C);
                        break;
                    default:
                        break;
                }
                UpDataToStrokesObject();
            }
        }

        private int thicknessListIndex = 1;

        public int ThicknessListIndex
        {
            get { return thicknessListIndex; }
            set
            {
                SetProperty(ref thicknessListIndex, value);
                if (thicknessListIndex >= 0)
                {
                    DrawingAttributeObject.Width = DrawingAttributeObject.Height = Convert.ToDouble(ThicknessList[thicknessListIndex].Substring(0, 3));
                    UpDataToStrokesObject();
                }
            }
        }


        public string SaveToPath { get; private set; }

        public string RemoveBackgroundSaveToPath { get; private set; }

        public string DrawingSaveToPath { get; private set; }



        /// <summary>
        /// 用于判断是否更换了文件,更换了文件则需要重新计算去背功能
        /// </summary>
        private bool IsNewFile = false;

        //去背图片和原图的图片数据
        private BitmapSource originalimagePreviewSource = null;
        private BitmapSource removeBackgroundImagePreviewSource = null;
        public SignatureCreateDialogViewModel()
        {
            DrawingAttributeObject = new DrawingAttributes();
            StrokesObject = new StrokeCollection();
            FontNameList = new ObservableCollection<string>();
            ThicknessList = new ObservableCollection<string>() { "1.0pt", "2.0pt", "4.0pt", "6.0pt", "8.0pt" };//改了这里记得去改ThicknessListIndex的Set方法里面的取值
            CancelCommand = new DelegateCommand(Cancel);
            CreateCommnad = new DelegateCommand(Create);
            UpdataDrawingStrokesCommnad = new DelegateCommand(UpdataDrawingStrokes);
            CheckedCommnad = new DelegateCommand<object>(Checked);
            OpenImageCommnad = new DelegateCommand(OpenImage);
            ClearTextCommnad = new DelegateCommand(ClearText);
            ClearInkCanvasCommnad = new DelegateCommand(ClearInkCanvas);
            DrawingAttributeObject.Color = Colors.Black;
            DrawingAttributeObject.Width = StrokeWidth;
            DrawingAttributeObject.Height = StrokeHigh;
            WeakEventManager<StrokeCollection, StrokeCollectionChangedEventArgs>.AddHandler(StrokesObject, "StrokesChanged", StrokesObject_StrokesChanged);
            InitFontNameList();
        }

        private void StrokesObject_StrokesChanged(object sender, StrokeCollectionChangedEventArgs e)
        {
            DrawingAttributeObject.Width = StrokeWidth;
            DrawingAttributeObject.Height = StrokeHigh;
        }

        private void InitFontNameList()
        {
            System.Drawing.Text.InstalledFontCollection objFont = new System.Drawing.Text.InstalledFontCollection();
            foreach (var item in objFont.Families)
            {
                FontNameList.Add(item.Name);
            }
        }

        private void Checked(object index)
        {
            RadioButtonIndex = Convert.ToInt32(index);
        }

        public void UpDataImageRadioButtonIndex(int Index)
        {
            ImageRadioButtonIndex = Index;
        }

        public void UpDataRadioButtonIndex(int Index)
        {
            RadioButtonIndex = Index;
        }

        private void UpDataToStrokesObject()
        {
            foreach (var item in StrokesObject)
            {
                item.DrawingAttributes = DrawingAttributeObject.Clone();
            }
            DrawingAttributeObject.Width = DrawingAttributeObject.Height = 3;
        }
        private void ClearText()
        {
            InputText = "";
        }

        private void OpenImage()
        {
            OpenFileDialog openFile = new OpenFileDialog();
            openFile.Filter = "All Image Files(*.bmp;*.gif;*.jpeg;*.jpg;*.png;*.tiff)|*.bmp;*.gif;*.jpeg;*.jpg;*.png;*.tiff|(*.bmp)|*.bmp|" +
                "(*.gif)|*.gif|" +
                "(*.jpeg)|*.jpeg|" +
                "(*.jpg)|*.jpg|" +
                "(*.png)|*.png|" +
                "(*.tiff)|*.tiff";
            if (openFile.ShowDialog() == false)
            {
                return;
            }
            string path = App.CachePath.CustomStampPath;
            string name = Guid.NewGuid().ToString();
            if (!string.IsNullOrEmpty(path))
            {
                BitmapImage image = new BitmapImage(new Uri(openFile.FileName));
                double scale = Math.Min((double)600 / image.PixelWidth, (double)600 / image.PixelHeight);
                scale = Math.Min(scale, 1);
                BitmapEncoder encoder = new PngBitmapEncoder();
                var targetBitmap = new TransformedBitmap(image, new ScaleTransform(scale, scale));
                encoder.Frames.Add(BitmapFrame.Create(targetBitmap));
                path = System.IO.Path.Combine(path, name);
                using (FileStream stream = new FileStream(path, FileMode.Create))
                {
                    encoder.Save(stream);
                }
                if (!string.IsNullOrEmpty(SaveToPath))
                {
                    App.CachePath.AddToDeleteFiles(SaveToPath);
                }
                IsNewFile = true;
                SaveToPath = path;
                ImagePreviewSource = originalimagePreviewSource = targetBitmap;
                ShowImageButton = Visibility.Collapsed;
                if (IsRemoveBackground)
                {
                    ImagePreviewSource = removeBackgroundImagePreviewSource = ToBitmapImage(KnockOutGzf());
                }
            }
            else
            {
                SaveToPath = "";
            }
        }

        private void ClearInkCanvas()
        {
            StrokesObject.Clear();
        }

        /// <summary>
        /// 去除白底
        /// </summary>
        private Bitmap KnockOutGzf()
        {
            System.Drawing.Image image = System.Drawing.Image.FromFile(SaveToPath);
            Bitmap bitmapProxy = new Bitmap(image);
            image.Dispose();
            for (int i = 0; i < bitmapProxy.Width; i++)
            {
                for (int j = 0; j < bitmapProxy.Height; j++)
                {
                    System.Drawing.Color c = bitmapProxy.GetPixel(i, j);
                    if (!(c.R < 240 || c.G < 240 || c.B < 240))
                    {
                        bitmapProxy.SetPixel(i, j, System.Drawing.Color.Transparent);
                    }
                }
            }
            return bitmapProxy;
        }

        /// <summary>
        /// 将 Bitmap 转化为 BitmapSource
        /// </summary>
        /// <param name="bmp"/>要转换的 Bitmap
        /// <returns>转换后的 BitmapImage</returns>
        private BitmapImage ToBitmapImage(System.Drawing.Bitmap bmp)
        {
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);

            BitmapImage image = new BitmapImage();
            image.BeginInit();
            image.StreamSource = ms;
            image.CacheOption = BitmapCacheOption.OnLoad;
            image.EndInit();
            //编码，缓存到本地
            string path = App.CachePath.CustomStampPath;
            string name = Guid.NewGuid().ToString();
            BitmapEncoder encoder = new PngBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create(image));
            path = System.IO.Path.Combine(path, name);
            using (FileStream stream = new FileStream(path, FileMode.Create))
            {
                encoder.Save(stream);
            }
            if (!string.IsNullOrEmpty(RemoveBackgroundSaveToPath))
            {
                App.CachePath.AddToDeleteFiles(RemoveBackgroundSaveToPath);
            }
            RemoveBackgroundSaveToPath = path;
            IsNewFile = false;
            return image;
        }
        /// <summary>
        /// 把文字转换成Bitmap
        /// </summary>
        /// <param name="text"></param>
        /// <param name="font"></param>
        /// <param name="rect">用于输出的矩形，文字在这个矩形内显示，为空时自动计算</param>
        /// <param name="fontcolor">字体颜色</param>
        /// <param name="backColor">背景颜色</param>
        /// <returns></returns>
        private Bitmap TextToBitmap(string text, string FontFamily, double size, Rectangle rect, System.Windows.Media.Brush fontcolor, System.Drawing.Color backColor)
        {
            FormattedText formatText = new FormattedText(text,
            CultureInfo.CurrentCulture,
            FlowDirection.LeftToRight,
            new Typeface(new System.Windows.Media.FontFamily(FontFamily), FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),
            size,
            fontcolor, Helper.DpiHelpers.Dpi / 96F);

            DrawingVisual drawingVisual = new DrawingVisual();
            DrawingContext dc = drawingVisual.RenderOpen();
            dc.DrawText(formatText, new System.Windows.Point(2, 10));
            dc.Close();


            Rect x = drawingVisual.ContentBounds;
            Rect DrawRect = new Rect(0, 0, x.Width + 2, x.Height + 10);

            RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap((int)DrawRect.Width + 2, (int)DrawRect.Height + 10, 96F, 96F, PixelFormats.Pbgra32);
            renderTargetBitmap.Render(drawingVisual);

            MemoryStream stream = new MemoryStream();
            BitmapEncoder encoder = new PngBitmapEncoder();

            encoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
            encoder.Save(stream);

            Bitmap bitmap = new Bitmap(stream);

            return bitmap;
        }

        private void Cancel()
        {
            RequestClose.Invoke(new DialogResult(ButtonResult.Cancel));
        }

        private void Create()
        {
            switch (TabItemIndex)
            {
                case 0:
                    {
                        if (string.IsNullOrEmpty(InputText))
                        {
                            Cancel();
                            return;
                        }
                        System.Windows.Media.Brush fontcolor = new SolidColorBrush((System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString("#252629"));
                        switch (RadioButtonIndex)
                        {
                            case 1:
                                fontcolor = new SolidColorBrush((System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString("#252629"));
                                break;
                            case 2:
                                fontcolor = new SolidColorBrush((System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString("#F3465B"));
                                break;
                            case 3:
                                fontcolor = new SolidColorBrush((System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString("#273C62"));
                                break;
                            case 4:
                                fontcolor = new SolidColorBrush((System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString("#94989C"));
                                break;
                            default:
                                break;
                        }

                        Bitmap bmp = TextToBitmap(InputText, FontNameList[fontNameIndex], 20, Rectangle.Empty, fontcolor, System.Drawing.Color.Transparent);
                        string guid = Guid.NewGuid().ToString();
                        string path = System.IO.Path.Combine(App.CachePath.SignatureStampPath, guid);
                        bmp.Save(path, ImageFormat.Png);
                        SaveToPath = path;
                    }
                    break;
                case 1:
                    {

                        var FreeHandpath = App.CachePath.SignatureFreeHandPath;
                        string name = Guid.NewGuid().ToString();
                        FreeHandpath = System.IO.Path.Combine(FreeHandpath, name);
                        using (System.IO.FileStream stream = new System.IO.FileStream(FreeHandpath, System.IO.FileMode.Create))
                        {
                            StrokesObject.Save(stream);
                        }

                        StampAnnotArgs stampArgs = new StampAnnotArgs();

                        List<List<System.Windows.Point>> RawPointList = new List<List<System.Windows.Point>>();
                        for (int kk = 0; kk < StrokesObject.Count; kk++)
                        {
                            List<System.Windows.Point> p = new List<System.Windows.Point>();
                            RawPointList.Add(p);
                            for (int gg = 0; gg < StrokesObject[kk].StylusPoints.Count; gg++)
                            {
                                var point = StrokesObject[kk].StylusPoints[gg].ToPoint();

                                if (point.X >= 0 && point.Y >= 0)
                                    RawPointList[kk].Add(point);

                            }
                        }
                        DrawingSaveToPath = FreeHandpath;

                        stampArgs.SetInkData(RawPointList, drawingAttributes.Width, drawingAttributes.Color);
                        var writeStamp = stampArgs.GetStampDrawing();

                        FreeHandpath = App.CachePath.SignatureStampPath;
                        string thumbnailName = Guid.NewGuid().ToString();
                        FreeHandpath = System.IO.Path.Combine(FreeHandpath, thumbnailName);
                        using (FileStream stream5 = new FileStream(FreeHandpath, FileMode.Create))
                        {
                            PngBitmapEncoder encoder5 = new PngBitmapEncoder();
                            encoder5.Frames.Add(BitmapFrame.Create(writeStamp));
                            encoder5.Save(stream5);
                        }
                        SaveToPath = FreeHandpath;
                    }
                    break;
                case 2:
                    break;
                default:
                    break;
            }
            DialogParameters valuePairs = new DialogParameters();
            valuePairs.Add(ParameterNames.DataModel, this);
            RequestClose.Invoke(new DialogResult(ButtonResult.OK, valuePairs));
        }

        /// <summary>
        /// 绘制时使用的画笔
        /// </summary>
        private void UpdataDrawingStrokes()
        {
            DrawingAttributeObject.Width = DrawingAttributeObject.Height = Convert.ToDouble(ThicknessList[thicknessListIndex].Substring(0, 3));
        }

        public bool CanCloseDialog()
        {
            return true;
        }

        public void OnDialogClosed()
        {
            return;
        }

        public void OnDialogOpened(IDialogParameters parameters)
        {
            if (parameters != null)
            {
                PDFViewer = parameters.GetValue<CPDFViewer>(ParameterNames.PDFViewer);
                if (PDFViewer != null)
                {

                }
            }
            return;
        }
    }
}