PDFOffice_Windows_exe/PDF Office/ViewModels/Dialog/HomePageToolsDialogs/HomePageExtractDialogViewModel.cs

using ComPDFKit.PDFDocument;
using ComPDFKitViewer.PdfViewer;
using PDF_Office.Model;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using SQLitePCL;
using System;
using System.Collections.Generic;
using System.Linq;
using PDF_Office.Model.HomePageToolsDialogs;
using PDF_Office.Helper;
using System.Diagnostics;
using PDF_Office.CustomControl;
using PDF_Office.Model.Dialog.HomePageToolsDialogs;
using ImTools;

namespace PDF_Office.ViewModels.Dialog.HomePageToolsDialogs
{
    public class HomePageExtractDialogViewModel : BindableBase, IDialogAware
    {
        #region 参数和属性
        public CPDFDocument document;

        public CPDFViewer currentViewer;

        private HomePageExtractDialogModel extractModel = new HomePageExtractDialogModel();

        private string savefilepath { get; set; }



        public string ExtractToSingleFileIsCheck {get;set;} = "False";

        public string DeleteAfterExtractIsCheck { get; set; } = "Fales";

        public string PageRangeText { get; set; } = "";

        public string PageRangeSelectIndex { get; set; } = "0";

        private int maxPageRange = 0;
        public int MaxPageRange
        {
            get { return maxPageRange; }
            set
            {
                SetProperty(ref maxPageRange, value);
            }
        }
        #endregion

        #region 委托声明
        public DelegateCommand CancelCommand { get; set; }

        public DelegateCommand ExtractCommand { get; set; }

        public DelegateCommand ExtractToSingleFileCommand { get; set; }

        public DelegateCommand DeleteAfterExtractCommand { get; set; }

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

        public DelegateCommand<object> CmbPageTextChanged { get; set; }
        #endregion

        public HomePageExtractDialogViewModel()
        {
            CancelCommand = new DelegateCommand(cancel);
            ExtractCommand = new DelegateCommand(extract);
            ExtractToSingleFileCommand = new DelegateCommand(extractToSingleFile);
            DeleteAfterExtractCommand = new DelegateCommand(deleteAfterExtract);
            CmbPageSelectionChanged = new DelegateCommand<object>(CmbPageSelectionChangedEvent);
            CmbPageTextChanged = new DelegateCommand<object>(CmbPageTextChangedEvent);

        }
        #region 逻辑函数
        private void cancel()
        {
            RequestClose.Invoke(new DialogResult(ButtonResult.Cancel));
        }

        private void extract()
        {
            HomePageEditHelper.GetPagerange(PageRangeSelectIndex, currentViewer, ref extractModel.PageRange, PageRangeText);
            if (extractModel.PageRange == "")
            {
                Trace.WriteLine("输入不对");
                MessageBoxEx.Show("输入不对");
                return;
            }
            char[] enumerationSeparator = new char[] { ',' };
            char[] rangeSeparator = new char[] { '-' };
            if (!CommonHelper.GetPagesInRange(ref extractModel.PageParm, extractModel.PageRange, currentViewer.Document.PageCount, enumerationSeparator, rangeSeparator))
            { //TODO
                Trace.WriteLine("输入不对");
                MessageBoxEx.Show("输入不对");
                return;
            }
            if (extractModel.ExtractToSingleFile)
            {
                for (int i = 0; i < extractModel.PageParm.ToArray().Length; i++)
                {
                    CPDFDocument extractdoc = CPDFDocument.CreateDocument();
                    extractdoc.ImportPages(currentViewer.Document, (extractModel.PageParm.ToArray()[i] + 1).ToString());
                    Trace.WriteLine(extractModel.PageParm.ToArray()[i].ToString());
                    string createfilepath= CommonHelper.CreateFilePath(savefilepath + currentViewer.Document.FileName + ".extract" + i.ToString() + ".pdf");
                    extractdoc.WriteToFilePath(createfilepath);
                    extractdoc.Release();
                }
                if (extractModel.DeleteAfterExtract)
                {
                    currentViewer.Document.RemovePages(extractModel.PageParm.ToArray());
                    currentViewer.Document.WriteToLoadedPath();
                }

            }
            else
            {
                CPDFDocument extractdoc = CPDFDocument.CreateDocument();
                extractdoc.ImportPages(currentViewer.Document, extractModel.PageRange);
                string createfilepath = CommonHelper.CreateFilePath(savefilepath + currentViewer.Document.FileName + ".extract.pdf");
                extractdoc.WriteToFilePath(createfilepath);
                if (extractModel.DeleteAfterExtract)
                {
                    currentViewer.Document.RemovePages(extractModel.PageParm.ToArray());
                    currentViewer.Document.WriteToLoadedPath();
                }
                extractdoc.Release();
            }
            CommonHelper.ShowFileBrowser(currentViewer.Document.FilePath);
            RequestClose.Invoke(new DialogResult(ButtonResult.OK));
        }

        private void extractToSingleFile()
        {
            if (ExtractToSingleFileIsCheck == "True")
            {
                extractModel.ExtractToSingleFile = true;
                Trace.WriteLine("ExtractToSingleFileIsCheck" + extractModel.ExtractToSingleFile);
            }
            else
            {
                extractModel.ExtractToSingleFile = false;
                Trace.WriteLine("ExtractToSingleFileIsCheck" + extractModel.ExtractToSingleFile);
            }
        }

        private void deleteAfterExtract()
        {

            if (DeleteAfterExtractIsCheck == "True")
            {
                extractModel.DeleteAfterExtract = true;
                Trace.WriteLine("DeleteAfterExtractIsCheck" + extractModel.DeleteAfterExtract);
            }
            else
            {
                extractModel.DeleteAfterExtract = false;
                Trace.WriteLine("DeleteAfterExtractIsCheck" + extractModel.DeleteAfterExtract);
            }

        }

        private void CmbPageSelectionChangedEvent(object e)
        {
            ///这里采用的是将预览UI控件传递过来的方式，为下下策
            ///正确的方式应该是 通过声明一些属性，再通过绑定来更新预览控件对应值的形式
            ///但是目前发现自定义控件的依赖属性绑定有些问题，因此先用此方法，将业务逻辑代码先调整到VM里
            var ExtractPreview = e as PageTurningPreview;
            if (ExtractPreview != null)
            {
                string PageRangeSelectIndex = this.PageRangeSelectIndex;
                var currentViewer = this.currentViewer;
                string PageRange = "";
                var PageRangeText = this.PageRangeText;
                if (PageRangeSelectIndex == "0" || PageRangeSelectIndex == "1" || PageRangeSelectIndex == "2")
                {
                    HomePageEditHelper.GetPagerange(PageRangeSelectIndex, currentViewer, ref PageRange, PageRangeText);
                    char[] enumerationSeparator = new char[] { ',' };
                    char[] rangeSeparator = new char[] { '-' };
                    if (!CommonHelper.GetPagesInRange(ref ExtractPreview.PageIndexLists, PageRange, currentViewer.Document.PageCount, enumerationSeparator, rangeSeparator))
                    { //TODO
                        ExtractPreview.PageIndexLists.Add(0);
                        Trace.WriteLine("输入不对");
                        MessageBoxEx.Show("输入不对");
                        return;
                    }

                }
                ExtractPreview.PageIndex.Text = (ExtractPreview.PageIndexLists.Last<int>() + 1).ToString();
                ExtractPreview.CurrentIndex = 0;
                ExtractPreview.CurrentPage.Text = (ExtractPreview.PageIndexLists[ExtractPreview.CurrentIndex] + 1).ToString();
                ExtractPreview.AwaitRenderBitmap(ExtractPreview.document);
            }
        }

        private void CmbPageTextChangedEvent(object e)
        {
            var ExtractPreview = e as PageTurningPreview;
            if (ExtractPreview != null)
            {
                string PageRangeSelectIndex = this.PageRangeSelectIndex;
                var currentViewer = this.currentViewer;
                string PageRange = "";
                var PageRangeText = this.PageRangeText;
                HomePageEditHelper.GetPagerange(PageRangeSelectIndex, currentViewer, ref PageRange, PageRangeText);
                char[] enumerationSeparator = new char[] { ',' };
                char[] rangeSeparator = new char[] { '-' };

                if (!CommonHelper.GetPagesInRange(ref ExtractPreview.PageIndexLists, PageRange, currentViewer.Document.PageCount, enumerationSeparator, rangeSeparator))
                { //TODO
                    ExtractPreview.PageIndexLists.Add(0);

                    return;
                }
                else
                {
                    ExtractPreview.PageIndex.Text = (ExtractPreview.PageIndexLists.Last<int>() + 1).ToString();
                    ExtractPreview.CurrentIndex = 0;
                    ExtractPreview.CurrentPage.Text = (ExtractPreview.PageIndexLists[ExtractPreview.CurrentIndex] + 1).ToString();
                    ExtractPreview.AwaitRenderBitmap(ExtractPreview.document);
                }
            }
        }
        #endregion

        #region 框架行为
        public string Title => "";

        public event Action<IDialogResult> RequestClose;

        public bool CanCloseDialog()
        {
            return true;
        }

        public void OnDialogClosed()
        {
        }

        public void OnDialogOpened(IDialogParameters parameters)
        {
            CPDFViewer viewer = null;
            string filepath = "";
            parameters.TryGetValue<CPDFViewer>(ParameterNames.PDFViewer, out viewer);
            parameters.TryGetValue<string>(ParameterNames.FilePath, out filepath);
            if (viewer != null && viewer.Document != null)
            {
                currentViewer = viewer;
                MaxPageRange = viewer.Document.PageCount;
                savefilepath = filepath.Replace(currentViewer.Document.FileName + ".pdf", "");
                document = currentViewer.Document;
            }
        }
        #endregion
    }
}