PDFOffice_Windows_exe/PDF Office/ViewModels/Dialog/HomePageToolsDialogs/HomePagePrinter/HomePagePrinterDocumentContentViewModel.cs

using ComPDFKitViewer.PdfViewer;
using PDF_Office.EventAggregators;
using PDF_Office.Model;
using PDF_Office.Model.Dialog.HomePageToolsDialogs.HomePagePrinter;
using Prism.Commands;
using Prism.Events;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Linq;

namespace PDF_Office.ViewModels.Dialog.HomePageToolsDialogs.HomePagePrinter
{
    public class HomePagePrinterDocumentContentViewModel : BindableBase, INavigationAware
    {
        private CPDFViewer PDFViewer;
        public PrintSettingsInfo PrintSettingsInfo;
        public IEventAggregator printDocumentEvent;
        private string _paperWidth;
        public string PaperWidth
        {
            get => _paperWidth;
            set => SetProperty(ref _paperWidth, value);
        }

        private string _paperHeight;
        public string PaperHeight
        {
            get => _paperHeight;
            set => SetProperty(ref _paperHeight, value);
        }

        private string _viewBoxWidth;
        public string ViewBoxWidth
        {
            get => _viewBoxWidth;
            set => SetProperty(ref _viewBoxWidth, value);
        }

        private string _viewBoxHeight;
        public string ViewBoxHeight
        {
            get => _viewBoxHeight;
            set => SetProperty(ref _viewBoxHeight, value);
        }

        /// <summary>
        /// 打印的总页数
        /// </summary>
        private int _printedPageCount;
        public int PrintedPageCount
        {
            get => _printedPageCount;
            set => SetProperty(ref _printedPageCount, value);
        }

        public HomePagePrinterDocumentContentViewModel(IEventAggregator eventAggregator)
        {
            this.printDocumentEvent = eventAggregator;
            printDocumentEvent.GetEvent<SendPrintSettingsInfoEvent>().Subscribe(RecvPrintSettingsInfo);
        }

        public void RecvPrintSettingsInfo(PrintSettingsInfo printSettingsInfo)
        {
            if (PDFViewer != null && printSettingsInfo != null)
            {
                SetPreview();
                CaculatePrintedPageCount();
            }
        }

        public void SetViewBox()
        {
            if (float.Parse(PaperHeight) / float.Parse(PaperWidth) >= (306.0 / 224.0))
            {
                ViewBoxHeight = "306";
                ViewBoxWidth = (float.Parse(PaperWidth) / float.Parse(PaperHeight) * 306).ToString();
            }
            else
            {
                ViewBoxWidth = "224";
                ViewBoxHeight = (float.Parse(PaperHeight) / float.Parse(PaperWidth) * 224).ToString();
            }
        }

        public void SetPreview()
        {
            if (PrintSettingsInfo.printModInfo.EnumPrintMod != EnumPrintMod.StatusPoster)
            {
                if (PrintSettingsInfo.EnumPrintOrientation == EnumPrintOrientation.StatusPortrait)
                {
                    PaperWidth = String.Format("{0:F1}", (PrintSettingsInfo.PageMediaSize.Width) / 96 * 25.4);
                    PaperHeight = String.Format("{0:F1}", (PrintSettingsInfo.PageMediaSize.Height) / 96 * 25.4);
                }
                else
                {
                    PaperHeight = String.Format("{0:F1}", (PrintSettingsInfo.PageMediaSize.Width) / 96 * 25.4);
                    PaperWidth = String.Format("{0:F1}", (PrintSettingsInfo.PageMediaSize.Height) / 96 * 25.4);
                }
                SetViewBox();
            }
            else
            {
            }
        }

        public void CaculatePrintedPageCount()
        {
            PrintedPageCount = PDFViewer.Document.PageCount;
            if (PrintSettingsInfo.EnumPageRange == EnumPageRange.StatusOddRange)
            {
                if (PrintedPageCount % 2 == 0)
                {
                    PrintedPageCount = PrintedPageCount / 2;
                }
                else
                {
                    PrintedPageCount = PrintedPageCount / 2 + 1;
                }
            }
            else if (PrintSettingsInfo.EnumPageRange == EnumPageRange.StatusEvenRange)
            {
                if (PrintedPageCount % 2 == 0)
                {
                    PrintedPageCount = PrintedPageCount / 2;
                }
                else
                {
                    PrintedPageCount = PrintedPageCount / 2;
                }
            }
            else if (PrintSettingsInfo.EnumPageRange == EnumPageRange.StatusCustomizedRange)
            {
                PrintedPageCount = PrintSettingsInfo.CustomRange.Count;
            }
            if (PrintSettingsInfo.printModInfo.EnumPrintMod == EnumPrintMod.StatusMultiple)
            {
                MultipleInfo multipleInfo = (MultipleInfo)PrintSettingsInfo.printModInfo;
                if (PrintedPageCount % (multipleInfo.HorizontalPageNumber * multipleInfo.VerticalPageNumber) != 0)
                {
                    PrintedPageCount = PrintedPageCount / (multipleInfo.HorizontalPageNumber * multipleInfo.VerticalPageNumber) + 1;
                }
                else
                {
                    PrintedPageCount = PrintedPageCount / (multipleInfo.HorizontalPageNumber * multipleInfo.VerticalPageNumber);
                }
            }
            else if (PrintSettingsInfo.printModInfo.EnumPrintMod == EnumPrintMod.StatusBooklet)
            {
                BookletInfo bookletInfo = (BookletInfo)PrintSettingsInfo.printModInfo;
                if (PrintedPageCount == 1)
                {
                    PrintedPageCount = 1;
                }
                else
                {
                    PrintedPageCount = (bookletInfo.EndPaperIndex - bookletInfo.BeginPaperIndex) * 2;
                    //PrintedPageCount = (PrintedPageCount%4 == 0)?(PrintedPageCount/2):((PrintedPageCount / 4) + 1) * 2;
                    if (bookletInfo.EnumBookletSubset == EnumBookletSubset.StatusFrontSideOnly  || 
                        bookletInfo.EnumBookletSubset == EnumBookletSubset.StatusBackSideOnly)
                    {
                        PrintedPageCount /= 2;
                    }
                }
            }
        }

        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<PrintSettingsInfo>(ParameterNames.PrintSettingsInfo, out PrintSettingsInfo);
            if (PDFViewer != null && PrintSettingsInfo != null)
            {
                SetPreview();
                CaculatePrintedPageCount();
            }
        }
    }
}