using Prism.Mvvm;
using Prism.Regions;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Media;
using ComPDFKitViewer.PdfViewer;
using PDF_Master.Model;
using System.Collections.ObjectModel;
using PDF_Master.Model.PageEdit;
using Prism.Commands;
using System.Windows;
using System.Windows.Media.Imaging;
using System.Windows.Controls.Primitives;
using System.Diagnostics;
using System.Windows.Controls;
using System.Windows.Threading;
using Prism.Events;
using PDF_Master.EventAggregators;
using System.Windows.Input;
using PDF_Master.Helper;
using Microsoft.Win32;
using ComPDFKit.PDFDocument;
using PDF_Master.CustomControl;
using PDF_Master.Model.HomePageToolsDialogs;
using System.IO;
using System.Text.RegularExpressions;
using static PDF_Master.Model.Dialog.ToolsDialogs.SaftyDialogs.DeleteSafetySettintgsModel;
using PDF_Master.Model.Dialog.ToolsDialogs.SaftyDialogs;
using PDF_Master.Properties;
using PDF_Master.Views.PageEdit;

namespace PDF_Master.ViewModels.PageEdit
{
    public class PageEditContentViewModel : BindableBase, INavigationAware
    {
        #region 文案

        private string T_title;

        public string T_Title
        {
            get { return T_title; }
            set
            {
                SetProperty(ref T_title, value);
            }
        }

        private string T_rotateLeftToolTip;

        public string T_RotateLeftToolTip
        {
            get { return T_rotateLeftToolTip; }
            set
            {
                SetProperty(ref T_rotateLeftToolTip, value);
            }
        }

        private string T_rotateRightToolTip;

        public string T_RotateRightToolTip
        {
            get { return T_rotateRightToolTip; }
            set
            {
                SetProperty(ref T_rotateRightToolTip, value);
            }
        }

        private string T_deleteToolTip;

        public string T_DeleteToolTip
        {
            get { return T_deleteToolTip; }
            set
            {
                SetProperty(ref T_deleteToolTip, value);
            }
        }

        private string T_deleteLook = "";

        public string T_DeleteLook
        {
            get { return T_deleteLook; }
            set
            {
                SetProperty(ref T_deleteLook, value);
            }
        }

        private void InitString()
        {
            T_Title = App.MainPageLoader.GetString("Thumbnails_Title");
            T_DeleteToolTip = App.MainPageLoader.GetString("ToolTipsPageEdit_Delete");
            T_DeleteLook = App.MainPageLoader.GetString("T_DeleteLook");
            T_RotateRightToolTip = App.MainPageLoader.GetString("ToolTipsPageEdit_RotateRight");
            T_RotateLeftToolTip = App.MainPageLoader.GetString("ToolTipsPageEdit_RotateLeft");
        }

        #endregion 文案

        public CPDFViewer PDFViewer;

        public ViewContentViewModel viewContentViewModel;

        private IDialogService dialogs;

        private IEventAggregator eventor;

        /// <summary>
        /// 用于筛选多窗体时间的唯一识别码
        /// </summary>
        private string unicode = null;

        /// <summary>
        /// 项数据集合
        /// </summary>
        public ObservableCollection<PageEditItem> PageEditItems { get; set; }

        /// <summary>
        /// 页面范围的项集合
        /// </summary>
        public ObservableCollection<string> PageRangeItems { get; set; }

        #region 属性

        /// <summary>
        /// 是否是第一次加载
        /// </summary>
        private bool isFirstLoad = true;

        /// <summary>
        /// 是否正在拖拽排序中
        /// </summary>
        private bool DragSorting = false;

        /// <summary>
        /// 记录多选项中最后一项的索引
        /// </summary>
        private int maxSelectedIndex = -1;

        private Visibility showTip = Visibility.Collapsed;

        /// <summary>
        /// 是否显示渐隐提示
        /// </summary>
        public Visibility ShowTip
        {
            get { return showTip; }
            set
            {
                SetProperty(ref showTip, value);
            }
        }

        private Visibility isLoading = Visibility.Collapsed;

        /// <summary>
        /// 是否正在处理中
        /// </summary>
        public Visibility IsLoading
        {
            get { return isLoading; }
            set
            {
                SetProperty(ref isLoading, value);
            }
        }

        private int listSelecedIndex;

        /// <summary>
        /// 缩略图选中项的索引
        /// </summary>
        public int ListSelectedIndex
        {
            get { return listSelecedIndex; }
            set
            {
                SetProperty(ref listSelecedIndex, value);
                if (!IsSelectFormSelf && value >= 0)
                {
                    //显示页面范围选择控件
                    TxtPageInputVisibility = Visibility.Visible;
                    TbPageRange = (ListSelectedIndex + 1).ToString();
                }
            }
        }

        private bool isMultiSelected;

        /// <summary>
        /// 是否有多选 用于判断倒序和替换功能
        /// </summary>
        public bool IsMultiSelected
        {
            get { return isMultiSelected; }
            set
            {
                SetProperty(ref isMultiSelected, value);
            }
        }

        private int comboxSelectIndex;

        /// <summary>
        /// 下拉框选项集合
        /// </summary>
        public int ComboxSelectIndex
        {
            get { return comboxSelectIndex; }
            set
            {
                SetProperty(ref comboxSelectIndex, value);
                //隐藏tb页面范围显示控件
                TxtPageInputVisibility = Visibility.Collapsed;
                //选中指定的页面范围
                SuitPageRange(comboxSelectIndex);
            }
        }

        private Visibility tbPageRangeVisibility = Visibility.Visible;

        /// <summary>
        /// 页面范围的文本显示
        /// </summary>
        public Visibility TbPageRangeVisibility
        {
            get { return tbPageRangeVisibility; }
            set
            {
                SetProperty(ref tbPageRangeVisibility, value);
                if (value == Visibility.Visible)
                {
                    comboxSelectIndex = -1;
                }
            }
        }

        private string tbPageRange;

        /// <summary>
        /// 页面范围显示的内容
        /// </summary>
        public string TbPageRange
        {
            get { return tbPageRange; }
            set
            {
                SetProperty(ref tbPageRange, value);
            }
        }

        private Visibility txtPageInputVisibility = Visibility.Collapsed;

        /// <summary>
        /// 页面自定义输入框的显示
        /// </summary>
        public Visibility TxtPageInputVisibility
        {
            get { return txtPageInputVisibility; }
            set
            {
                SetProperty(ref txtPageInputVisibility, value);
            }
        }

        /// <summary>
        /// 页面缩放状态，-1 为最小值，1为最大值
        /// </summary>
        private int zoomIndex = 0;

        public int ZoomIndex
        {
            get { return zoomIndex; }
            set
            {
                SetProperty(ref zoomIndex, value);
            }
        }

        private string toastText = App.MainPageLoader.GetString("PageEdit_Failed");

        /// <summary>
        /// Toast提示
        /// </summary>
        public string ToastText
        {
            get { return toastText; }
            set
            {
                SetProperty(ref toastText, value);
            }
        }

        private Visibility isBOTAThumb = Visibility.Collapsed;

        /// <summary>
        /// 是否是BOTA侧边栏的缩略图
        /// </summary>
        public Visibility IsBOTAThumb
        {
            get { return isBOTAThumb; }
            set
            {
                SetProperty(ref isBOTAThumb, value);
            }
        }

        private Visibility showedPageSize = Visibility.Collapsed;

        /// <summary>
        /// 显示页面尺寸
        /// </summary>
        public Visibility ShowedPageSize
        {
            get { return showedPageSize; }
            set
            {
                SetProperty(ref showedPageSize, value);
                if (IsBOTAThumb != Visibility.Visible)
                {
                    if (value == Visibility.Visible)
                    {
                        HidePageSize = Visibility.Collapsed;
                    }
                    else
                    {
                        HidePageSize = Visibility.Visible;
                    }
                }
            }
        }

        private Visibility hidePageSize;

        /// <summary>
        /// 隐藏页面尺寸
        /// </summary>
        public Visibility HidePageSize
        {
            get { return hidePageSize; }
            set
            {
                SetProperty(ref hidePageSize, value);
            }
        }

        private bool canPaste = false;

        /// <summary>
        /// 是否可以粘贴
        /// </summary>
        public bool CanPaste
        {
            get { return canPaste; }
            set
            {
                SetProperty(ref canPaste, value);
            }
        }

        /// <summary>
        /// 页面缩放的范围
        /// </summary>
        private List<Size> ItemSizes = new List<Size>() {
            new Size(104,142),
                new Size(208, 294),
                new Size(312,441)
        };

        //选中的页面集合
        private List<int> selectedPageList = new List<int>();

        /// <summary>
        /// 是否是下拉框选项改变引起的选项变更事件
        /// </summary>
        private bool IsSelectFormSelf = false;

        #endregion 属性

        #region 命令

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

        /// <summary>
        /// 拦截键盘输入的事件
        /// </summary>
        public DelegateCommand<object> PreviewKeyDown { get; set; }

        /// <summary>
        /// 粘贴
        /// </summary>
        public DelegateCommand PasteCommand { get; set; }

        /// <summary>
        /// 复制
        /// </summary>
        public DelegateCommand CopyCommand { get; set; }

        /// <summary>
        /// 剪切
        /// </summary>
        public DelegateCommand CutCommand { get; set; }

        /// <summary>
        /// 替换文件
        /// </summary>
        public DelegateCommand ReplaceCommand { get; set; }

        /// <summary>
        /// 插入文件命令
        /// </summary>
        public DelegateCommand<object> InsertCommand { get; set; }

        /// <summary>
        /// 拆分文件
        /// </summary>
        public DelegateCommand SplitCommand { get; set; }

        /// <summary>
        /// 提取文件
        /// </summary>
        public DelegateCommand ExtractCommand { get; set; }

        /// <summary>
        /// 逆时针旋转
        /// </summary>
        public DelegateCommand LeftRotateCommand { get; set; }

        /// <summary>
        /// 顺时针旋转
        /// </summary>
        public DelegateCommand RightRotateCommand { get; set; }

        /// <summary>
        /// 删除
        /// </summary>
        public DelegateCommand DeleteCommand { get; set; }

        /// <summary>
        /// 倒序
        /// </summary>
        public DelegateCommand ReverseCommand { get; set; }

        /// <summary>
        /// 放大
        /// </summary>
        public DelegateCommand ZoomInCommand { get; set; }

        /// <summary>
        /// 缩小
        /// </summary>
        public DelegateCommand ZoomOutCommand { get; set; }

        /// <summary>
        /// 显示页面大小
        /// </summary>
        public DelegateCommand ShowPageSizeCommand { get; set; }

        public DelegateCommand ClearSelectedCommand { get; set; }

        /// <summary>
        /// 进入页面编辑
        /// </summary>
        public DelegateCommand EnterPageEditCommand { get; set; }

        #endregion 命令

        public PageEditContentViewModel(IDialogService dialogService, IEventAggregator eventAggregator)
        {
            //变量初始化
            dialogs = dialogService;
            eventor = eventAggregator;
            unicode = App.mainWindowViewModel.SelectedItem.Unicode;
            PageEditItems = new ObservableCollection<PageEditItem>();
            PageRangeItems = new ObservableCollection<string>();
            //绑定命令
            SelectionChangedCommand = new DelegateCommand<object>(SelectionChangedEvent);
            PreviewKeyDown = new DelegateCommand<object>(PreviewKeyDownEvent);

            SplitCommand = new DelegateCommand(SplitCommandEvent);
            InsertCommand = new DelegateCommand<object>(InsertCommandEvent);
            ReplaceCommand = new DelegateCommand(ReplaceCommandEvent, CanReplaceCommandExcute).ObservesProperty(() => IsMultiSelected);
            ExtractCommand = new DelegateCommand(ExtractCommandEvent, CanFileCommandExcute).ObservesProperty(() => ListSelectedIndex);
            DeleteCommand = new DelegateCommand(DeleteCommandEvent, CanFileCommandExcute).ObservesProperty(() => ListSelectedIndex);
            LeftRotateCommand = new DelegateCommand(LeftRotateCommandEvent, CanFileCommandExcute).ObservesProperty(() => ListSelectedIndex);
            RightRotateCommand = new DelegateCommand(RightRotateCommandEvent, CanFileCommandExcute).ObservesProperty(() => ListSelectedIndex);
            ReverseCommand = new DelegateCommand(ReverseCommandEvent, CanFileCommandExcute).ObservesProperty(() => ListSelectedIndex);
            ZoomInCommand = new DelegateCommand(ZoomInCommandEvent, CanZoomIn).ObservesProperty(() => ZoomIndex);
            ZoomOutCommand = new DelegateCommand(ZoomOutCommandEvent, CanZoomOut).ObservesProperty(() => ZoomIndex);
            ShowPageSizeCommand = new DelegateCommand(ShowPageSize);
            CopyCommand = new DelegateCommand(copy);
            PasteCommand = new DelegateCommand(() => { paste(); }, CanPasteExcute).ObservesProperty(() => CanPaste);
            CutCommand = new DelegateCommand(cut);
            ClearSelectedCommand = new DelegateCommand(clearSelected);
            EnterPageEditCommand = new DelegateCommand(enterpageeditr);

            //订阅页面刷新事件
            eventAggregator.GetEvent<PageEditRefreshEvent>().Subscribe(OnPageEditRefreshEvent, e => e.Unicode == unicode);

            eventAggregator.GetEvent<ViewContentEvent>().Subscribe(ViewContentChangedEvent, e => e.Unicode == unicode);

            CacheFilePath.Instance.PropertyChanged += Instance_PropertyChanged;

            RefreshPageRangeItem();
            InitString();
        }

        #region 事件

        private void ViewContentChangedEvent(ViewContentEventArgs obj)
        {
            //只有在缩略图模式下响应刷新，进入页面编辑时 会刷新可见范围内图片，不需要响应这个事件
            if (IsBOTAThumb == Visibility.Visible)
            {
                PageEditItems[PDFViewer.CurrentIndex].IsGetImage = false;
                PageEditItems[PDFViewer.CurrentIndex].Size = PDFViewer.Document.GetPageSize(PDFViewer.CurrentIndex);
                RefreshItemImage(PDFViewer.CurrentIndex, PDFViewer.CurrentIndex);
            }
        }

        /// <summary>
        /// 进入页面编辑
        /// </summary>
        private void enterpageeditr()
        {
            viewContentViewModel.EnterPageEdit();
        }

        private void Instance_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "CopyDoc")
            {
                if (CacheFilePath.Instance.CopyDoc != null)
                {
                    CanPaste = true;
                }
            }
        }

        /// <summary>
        /// 替换功能的逻辑
        /// 实现效果是，先删除后插入
        /// 跨页多选后替换的位置是多选的第一页位置
        /// </summary>
        private async void ReplaceCommandEvent()
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Multiselect = false;
            dialog.Filter = PDF_Master.Properties.Resources.OpenDialogFilter;
            if ((bool)dialog.ShowDialog())
            {
                IsLoading = Visibility.Visible;
                await Task.Delay(200);
                int pageCount = PDFViewer.Document.PageCount;
                int insertIndex = listSelecedIndex;

                //从文件插入到指定位置
                var result = await InsertFromFile(listSelecedIndex + 1, dialog.FileName);
                if (result)
                {
                    //插入成功后再删除原有页面
                    //2023-06-05 索引需要-1，因为上面的listSelecedIndex + 1，需要还原
                    if (result)
                        DoRemoveSelectedPages(new List<int>() { listSelecedIndex - 1 });
                }

                ReloadAfterOption(true, false, Tuple.Create(insertIndex - 1, insertIndex + pageCount));
                IsLoading = Visibility.Collapsed;
            }
        }

        /// <summary>
        /// 拆分功能的逻辑
        /// </summary>
        private void SplitCommandEvent()
        {
            DialogParameters valuePairs = new DialogParameters();
            valuePairs.Add(ParameterNames.PDFViewer, PDFViewer);
            dialogs.ShowDialog(DialogNames.SplitDialog, valuePairs, e =>
            {
                if (e.Result == ButtonResult.OK && e.Parameters != null)
                {
                    var model = e.Parameters.GetValue<HomePageSplitDialogModel>(ParameterNames.DataModel);
                    DoSplitPages(model);
                }
            });
        }

        /// <summary>
        /// 提取功能的逻辑
        /// </summary>
        private void ExtractCommandEvent()
        {
            dialogs.ShowDialog(DialogNames.ExtractDialog, null, e =>
            {
                if (e.Result == ButtonResult.OK && e.Parameters != null)
                {
                    var model = e.Parameters.GetValue<ExtractModel>(ParameterNames.DataModel);
                    DoExtractPages(model.IsEveryPageToFile, model.IsDeleteAfterExtract);
                }
            });
        }

        /// <summary>
        /// 插入功能的逻辑
        /// </summary>
        private async void InsertCommandEvent(object type)
        {
            if ((string)type == null)
            {
                return;
            }
            //获取插入位置
            int insertIndex = 0;
            if (listSelecedIndex < 0)
            {
                insertIndex = PageEditItems.Count;
            }
            else
            {
                insertIndex = listSelecedIndex + 1;
                if (isMultiSelected)
                {
                    insertIndex = maxSelectedIndex + 1;
                }
            }
            IsLoading = Visibility.Visible;
            await Task.Delay(3);

            PageEditHistory history = new PageEditHistory();
            history.InsertIndex = insertIndex;
            if ((string)type == ParameterNames.InsertType_Blank)
            {
                history.Type = ActionType.InsertCustomPages;
                history.InsertFilePath = "";
                //插入空白页面
                bool result;
                if (insertIndex == 0)
                {
                    result = PDFViewer.Document.InsertPage(insertIndex, PageEditItems[insertIndex].Size.Width, PageEditItems[insertIndex].Size.Height, null);
                    history.PageSize = PageEditItems[insertIndex].Size;
                }
                else
                {
                    result = PDFViewer.Document.InsertPage(insertIndex, PageEditItems[insertIndex - 1].Size.Width, PageEditItems[insertIndex - 1].Size.Height, null);
                    history.PageSize = PageEditItems[insertIndex - 1].Size;
                }
                if (!result)
                {
                    IsLoading = Visibility.Collapsed;
                    ShowToast();
                    return;
                }

                //UI层插入Item
                var item = GetNewPageEditItem(insertIndex);
                PageEditItems.Insert(insertIndex, item);

                //插入后 滚动到 选中的页面
                ReloadAfterOption(true, false, Tuple.Create(0, insertIndex + 1), true);
                await Task.Delay(10);
                //选中插入的页面
                ListSelectedIndex = insertIndex;
            }
            else if ((string)type == ParameterNames.InsertType_File)
            {
                OpenFileDialog dialog = new OpenFileDialog();
                dialog.Multiselect = false;
                dialog.Filter = PDF_Master.Properties.Resources.OpenDialogFilter;
                if ((bool)dialog.ShowDialog())
                {
                    //插入文件
                    var result = await InsertFromFile(insertIndex, dialog.FileName);
                    if (!result)
                    {
                        IsLoading = Visibility.Collapsed;
                        ShowToast();
                        return;
                    }

                    ReloadAfterOption(true, false, Tuple.Create(0, PDFViewer.Document.PageCount));
                }
                IsLoading = Visibility.Collapsed;
                //里面附带了Undo栈记录，需要提前返回，避免重复记录
                return;
            }
            else
            {
                DialogParameters keyValuePairs = new DialogParameters();
                Size size = new Size();
                size.Width = CommonHelper.GetUnitsFromPageSize(PDFViewer.Document.GetPageSize(listSelecedIndex).Width);
                size.Height = CommonHelper.GetUnitsFromPageSize(PDFViewer.Document.GetPageSize(listSelecedIndex).Height);
                keyValuePairs.Add(ParameterNames.CurrentPageSize, size);
                keyValuePairs.Add(ParameterNames.ListSelectedIndex, ListSelectedIndex);
                //int o = ListSelectedIndex;
                //插入自定义页面
                dialogs.ShowDialog(DialogNames.InsertDialog, keyValuePairs, e =>
                {
                    if (e.Result == ButtonResult.OK && e.Parameters != null)
                    {
                        var model = e.Parameters.GetValue<CustomInsertModel>(ParameterNames.DataModel);

                        var result = InsertFromCustomPage(insertIndex, model.width, model.height, model.filepath);
                        if (!result)
                        {
                            return;
                        }

                        history.Type = ActionType.InsertCustomPages;
                        history.InsertFilePath = model.filepath;
                        history.PageSize = new Size(model.width, model.height);
                    }
                });
            }
            IsLoading = Visibility.Collapsed;

            //添加记录到Undo栈，清除Redo栈
            history.viewmodel = this;
            PDFViewer.UndoManager.AddHistory(history);
        }

        /// <summary>
        /// 删除选中页面
        /// </summary>
        private async void DeleteCommandEvent()
        {
            AlertsMessage alertsMessage = new AlertsMessage();
            alertsMessage.ShowDialog("", T_DeleteLook, App.ServiceLoader.GetString("Text_no"), App.ServiceLoader.GetString("Text_ok"));

            if (alertsMessage.result == ContentResult.Ok)
            {
                IsLoading = Visibility.Visible;
                await Task.Delay(3);
                DoRemoveSelectedPages();
                ReloadAfterOption(true, true, Tuple.Create(0, PDFViewer.Document.PageCount));
                IsLoading = Visibility.Collapsed;
            }
        }

        /// <summary>
        /// 左旋转页面的逻辑
        /// </summary>
        private void LeftRotateCommandEvent()
        {
            RotateSelectedPages(false);
        }

        /// <summary>
        /// 右旋转页面的逻辑
        /// </summary>
        private void RightRotateCommandEvent()
        {
            RotateSelectedPages();
        }

        /// <summary>
        /// 页面倒序的逻辑
        /// </summary>
        private async void ReverseCommandEvent()
        {
            IsLoading = Visibility.Visible;
            await Task.Delay(3);
            List<int> pages = new List<int>();
            for (int i = 0; i < PageEditItems.Count; i++)
            {
                if (PageEditItems[i].Selected)
                {
                    pages.Add(i);
                }
            }
            DoReverse(pages);

            IsLoading = Visibility.Collapsed;
        }

        /// <summary>
        /// 将指定页面结合进行倒序
        /// </summary>
        private async void DoReverse(List<int> pages, bool isFromUndoRedo = false)
        {
            if (pages.Count <= 1)
            {
                ShowToast("请至少选择两个图片进行倒序操作。");
                return;
            }
            pages.Sort();

            //记录原位置和目标位置 用于undo，redo
            Dictionary<int, int> sourceTarget = new Dictionary<int, int>();
            for (int i = 0; i < pages.Count; i++)
            {
                int preindex = pages[i];
                int laterIndex = pages[pages.Count - i - 1];//尾部的索引
                if (laterIndex <= preindex)//交换完成
                {
                    //用于记录选中集合为奇数时，最中间Item的还原
                    sourceTarget.Add(preindex, preindex);
                    break;
                }

                var result = ExchangeItem(preindex, laterIndex);
                if (!result)
                {
                    ShowToast();
                    IsLoading = Visibility.Collapsed;
                    return;
                }
                sourceTarget.Add(preindex, laterIndex);
            }

            await Task.Delay(20);
            //转换成页码数据集合，传递给UI，选中目标页面
            //因虚拟化加载的问题，通过Selected来控制Item选中效果会有问题
            List<int> pageRange = new List<int>();
            for (int i = 0; i < pages.Count; i++)
            {
                pageRange.Add(pages[i] + 1);
            }

            NotifyUIToRefresh(pageRange);

            ReloadAfterOption(true, false, null);

            if (!isFromUndoRedo)
            {
                PageEditHistory history = new PageEditHistory();
                history.Type = ActionType.Reverse;
                history.SourceTargetValue = sourceTarget;
                history.viewmodel = this;
                PDFViewer.UndoManager.AddHistory(history);
            }
        }

        /// <summary>
        /// 交换两个Item顺序
        /// </summary>
        /// <param name="preiIndex"></param>
        /// <param name="laterIndex"></param>
        /// <returns></returns>
        private bool ExchangeItem(int preiIndex, int laterIndex)
        {
            if (preiIndex == laterIndex)
            {
                return true;
            }
            var sourceitem = PageEditItems[preiIndex];
            var targetitem = PageEditItems[laterIndex];

            var result = PDFViewer.Document.ExchangePage(preiIndex, laterIndex);
            if (!result)
            {
                return false;
            }

            PageEditItems.Remove(sourceitem);
            PageEditItems.Remove(targetitem);
            PageEditItems.Insert(preiIndex, targetitem);
            PageEditItems.Insert(laterIndex, sourceitem);

            return true;
        }

        /// <summary>
        /// 是否可以执行文件操作命令  除插入、拆分外
        /// </summary>
        /// <returns></returns>
        private bool CanFileCommandExcute()
        {
            //增加是否有选中多页的判断
            //修复问题：全选页面后，ctrl取消第一页的选中时，其余操作会因为ListSelectedIndex为-1被禁用的问题
            if (ListSelectedIndex < 0 && !IsMultiSelected)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        /// <summary>
        /// 校验是否可以替换
        /// </summary>
        /// <returns></returns>
        private bool CanReplaceCommandExcute()
        {
            //return !IsMultiSelected;
            return true;
        }

        /// <summary>
        /// 放大页面
        /// </summary>
        private void ZoomInCommandEvent()
        {
            ZoomIndex++;
            ChangeItemSize(ItemSizes[ZoomIndex + 1]);
            NotifyUIToRefresh();
        }

        /// <summary>
        /// 缩小页面
        /// </summary>
        private async void ZoomOutCommandEvent()
        {
            ZoomIndex--;
            ChangeItemSize(ItemSizes[ZoomIndex + 1]);
            //增加一定延时，计算页面显示范围时，用新的尺寸进行计算
            await Task.Delay(3);
            NotifyUIToRefresh();
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="newsize"></param>
        public void ChangeItemSize(Size newsize)
        {
            for (int i = 0; i < PageEditItems.Count; i++)
            {
                PageEditItems[i].ItemSize = newsize;
            }
            if (selectedPageList.Count > 0)
            {
                //缩略图模式 调整item大小的时候，更新选中项
                //如果注释掉，调整BOTA宽度后，缩略图视图中不会显示选中项
                if (selectedPageList.Count < 1)
                {
                    NotifyUIToRefresh(new List<int>() { PDFViewer.CurrentIndex + 1 });
                }
                else
                {
                    NotifyUIToRefresh(selectedPageList);
                }
            }
        }

        private bool CanZoomIn()
        {
            if (ZoomIndex >= 1)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        private bool CanZoomOut()
        {
            if (ZoomIndex <= -1)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        /// <summary>
        /// 响应UI发送刷新图片的事件
        /// </summary>
        /// <param name="e"></param>
        private void OnPageEditRefreshEvent(PageEditRefreshEventArgs e)
        {
            //UI发送事件过来通知刷新图片时
            //调整逻辑,前后预加载5页
            RefreshItemImage(e.PageRange.Item1 - 2, e.PageRange.Item2 + 2);
        }

        /// <summary>
        /// 选项改变事件
        /// 虚拟化的时候不会触发选中事件
        /// </summary>
        /// <param name="e"></param>
        private void SelectionChangedEvent(object e)
        {
            if (IsSelectFormSelf)
            {
                //避免频繁的触发该事件
                return;
            }
            var args = e as SelectionChangedEventArgs;
            //下下策 从UI控件获取所有选项的集合
            var listbox = args.OriginalSource as ListBox;

            if (args != null)
            {
                selectedPageList = new List<int>();
                for (int i = 0; i < listbox.SelectedItems.Count; i++)
                {
                    if (!selectedPageList.Contains((listbox.SelectedItems[i] as PageEditItem).PageNumber))
                    {
                        selectedPageList.Add((listbox.SelectedItems[i] as PageEditItem).PageNumber);
                    }
                }

                ////根据选中的范围 适配全部页面范围、奇数页面范围等
                //if (pagelist.Count == PageEditItems.Count)
                //{
                //    ComboxSelectIndex = 0;
                //    return;
                //}
                //只选中单个页面是，listselectedIndex 更准确
                if (selectedPageList.Count == 1)
                {
                    TbPageRange = (listSelecedIndex + 1).ToString();
                }
                else
                {
                    //根据选中的页面转换成1，3-10类似的字符串
                    string pageparm = CommonHelper.GetPageParmFromList(selectedPageList);
                    TbPageRange = pageparm;
                }
            }

            //Ctrl+A时让所有item选中
            var isCtrlorShiftDown = ((Keyboard.IsKeyDown(Key.LeftCtrl) && Keyboard.IsKeyDown(Key.A)) || (Keyboard.IsKeyDown(Key.RightCtrl) && Keyboard.IsKeyDown(Key.A)));
            if (isCtrlorShiftDown)
            {
                for (int i = 0; i < PageEditItems.Count; i++)

                {
                    PageEditItems[i].Selected = true;
                }
            }

            //判断是否有选中多项
            if (listbox.SelectedItems.Count > 1)
            {
                IsMultiSelected = true;
                maxSelectedIndex = listbox.Items.IndexOf(listbox.SelectedItems[listbox.SelectedItems.Count - 1]);
            }
            else
            {
                IsMultiSelected = false;
                //非多选的时候需要重置多选页码的标志符
                //否则会有多选页面复制后，粘贴位置不准确的问题
                maxSelectedIndex = -1;
            }
        }

        /// <summary>
        /// 限制文本框输入内容
        /// </summary>
        /// <param name="e"></param>
        private void PreviewKeyDownEvent(object e)
        {
            var args = e as KeyEventArgs;
            if (args == null)
            {
                return;
            }

            ////枚举 过滤所有不合理的输入
            //if (args.Key != Key.Enter && args.Key != Key.Back && args.Key != Key.OemComma && args.Key != Key.OemMinus && args.Key != Key.Subtract && !((args.Key >= Key.D0 && args.Key <= Key.D9) || (args.Key >= Key.NumPad0 && args.Key <= Key.NumPad9)))
            //{
            //    args.Handled = true;
            //}

            if (args.Key == Key.Enter)
            {
                if (PageRangeItems.Contains((args.OriginalSource as TextBox).Text))
                {
                    return;
                }
                List<int> TargetPageIndexs = new List<int>();
                var result = CommonHelper.GetPagesInRange(ref TargetPageIndexs, (args.OriginalSource as TextBox).Text, PDFViewer.Document.PageCount, new char[] { ',', '，' }, new char[] { '-' });
                if (!result)
                {
                    AlertsMessage alertsMessage = new AlertsMessage();
                    alertsMessage.ShowDialog("", App.MainPageLoader.GetString("PageRangeWarning"), App.ServiceLoader.GetString("Text_ok"));
                    return;
                }

                //选中输入的页面范围
                List<int> pageRange = new List<int>();
                for (int i = 0; i < PageEditItems.Count; i++)
                {
                    if (TargetPageIndexs.Contains(PageEditItems[i].PageNumber - 1))
                    {
                        pageRange.Add(i + 1);
                    }
                }

                NotifyUIToRefresh(pageRange);
            }
        }

        /// <summary>
        /// 失去焦点后选中页面
        /// </summary>
        /// <param name="obj"></param>
        public void lostfocus(object obj)
        {
            var args = obj as RoutedEventArgs;
            if (args == null || (args.OriginalSource as TextBox) == null)
            {
                return;
            }
            List<int> TargetPageIndexs = new List<int>();

            if (PageRangeItems.Contains((args.OriginalSource as TextBox).Text) && ComboxSelectIndex != 5)
            {
                //选中其他项，失去焦点时不报错
                return;
            }

            var result = CommonHelper.GetPagesInRange(ref TargetPageIndexs, (args.OriginalSource as TextBox).Text, PDFViewer.Document.PageCount, new char[] { ',', '，' }, new char[] { '-' });
            if (!result)
            {
                AlertsMessage alertsMessage = new AlertsMessage();
                alertsMessage.ShowDialog("", App.MainPageLoader.GetString("PageRangeWarning"), App.ServiceLoader.GetString("Text_ok"));
                return;
            }

            //选中输入的页面范围
            List<int> pageRange = new List<int>();
            for (int i = 0; i < PageEditItems.Count; i++)
            {
                if (TargetPageIndexs.Contains(PageEditItems[i].PageNumber - 1))
                {
                    pageRange.Add(i + 1);
                }
            }

            NotifyUIToRefresh(pageRange);
        }

        #endregion 事件

        #region 方法

        /// <summary>
        /// Esc退出多选
        /// </summary>
        private void clearSelected()
        {
            ListSelectedIndex = -1;
        }

        /// <summary>
        /// 调用打印机
        /// </summary>
        public async void print(List<int> SelectedPages)
        {
            await App.Current.Dispatcher.InvokeAsync(() =>
            {
                PDFViewer.GoToPage(listSelecedIndex);
            });
            DialogParameters printValue = new DialogParameters();
            printValue.Add(ParameterNames.PDFViewer, PDFViewer);
            printValue.Add(ParameterNames.FilePath, PDFViewer.Document.FileName);
            printValue.Add(ParameterNames.PrintCurrentPage, PDFViewer.CurrentIndex);
            printValue.Add(ParameterNames.PageList, SelectedPages);
            dialogs.ShowDialog(DialogNames.HomePagePrinterDialog, printValue, e => { });
        }

        /// <summary>
        /// 剪切
        /// </summary>
        private void cut()
        {
            //没有权限时，拦截剪切操作
            if (!viewContentViewModel.CheckPermissionBeforeOption())
            {
                return;
            }
            CacheFilePath.Instance.CopyDoc = null;
            CacheFilePath.Instance.CopyDoc = CPDFDocument.CreateDocument();
            List<int> pages = new List<int>();
            for (int i = 0; i < PageEditItems.Count; i++)
            {
                if (PageEditItems[i].Selected)
                {
                    pages.Add(i + 1);
                }
            }

            bool result = CacheFilePath.Instance.CopyDoc.ImportPages(PDFViewer.Document, String.Join(",", pages));
            if (!result)
            {
                ShowToast();
                return;
            }

            DoRemoveSelectedPages();
            ReloadAfterOption(true, true, Tuple.Create(0, PDFViewer.Document.PageCount));
        }

        /// <summary>
        /// 复制
        /// </summary>
        private void copy()
        {
            if (!viewContentViewModel.IAPBeforeFunction())
            {
                return;
            }

            if (viewContentViewModel.CheckPermissionBeforeOption())
            {
                CacheFilePath.Instance.CopyDoc?.Release();
                CacheFilePath.Instance.CopyDoc = CPDFDocument.CreateDocument();
                List<int> pages = new List<int>();
                if (isMultiSelected)
                {
                    //确认是多选了页面时，通过页面的选中状态获取选中页面
                    for (int i = 0; i < PageEditItems.Count; i++)
                    {
                        if (PageEditItems[i].Selected)
                        {
                            pages.Add(i + 1);
                        }
                    }
                }
                else
                {
                    //没有多选时，根据listbox的选中索引获取选中页面
                    pages.Add(ListSelectedIndex + 1);
                }

                bool result = CacheFilePath.Instance.CopyDoc.ImportPages(PDFViewer.Document, String.Join(",", pages));
                if (!result)
                {
                    ShowToast();
                    return;
                }
            }
        }

        /// <summary>
        /// 是否可以粘贴
        /// </summary>
        /// <returns></returns>
        private bool CanPasteExcute()
        {
            return this.CanPaste;
        }

        /// <summary>
        /// 粘贴
        /// </summary>
        private async void paste(int Index = -1)
        {
            if (!viewContentViewModel.IAPBeforeFunction())
            {
                return;
            }

            IsLoading = Visibility.Visible;
            int insertindex = maxSelectedIndex > listSelecedIndex ? maxSelectedIndex : listSelecedIndex;
            insertindex++;

            if (Index >= 0)
            {
                insertindex = Index;
            }
            else if (listSelecedIndex == -1)
            {
                insertindex = PageEditItems.Count;
            }

            if (CacheFilePath.Instance.CopyDoc == null)
            {
                return;
            }

            int pagecount = CacheFilePath.Instance.CopyDoc.PageCount;
            bool result = PDFViewer.Document.ImportPagesAtIndex(CacheFilePath.Instance.CopyDoc, "1-" + pagecount, insertindex);
            if (!result)
            {
                IsLoading = Visibility.Collapsed;
                ShowToast();
                return;
            }

            //UI层插入
            for (int i = 0; i < pagecount; i++)
            {
                var item = GetNewPageEditItem(i);
                PageEditItems.Insert(insertindex + i, item);
            }

            //加一点延时才能显示选中效果-2023.4.12，为解决卡顿问题，注释掉，注释掉未出现该选中问题
            //await Task.Delay(200);
            List<int> pageRange = new List<int>();
            for (int i = 0; i < pagecount; i++)
            {
                pageRange.Add(insertindex + i + 1);
            }

            PageEditHistory history = new PageEditHistory();
            history.InsertIndex = insertindex;
            history.InsertPageCount = pagecount;
            history.Type = ActionType.Paste;
            history.viewmodel = this;
            PDFViewer.UndoManager.AddHistory(history);

            //刷新页码等
            ReloadAfterOption(true, false, new Tuple<int, int>(0, PDFViewer.Document.PageCount));
            //通知Xaml选中新增的页面，从VM设置选中项会有问题
            NotifyUIToRefresh(pageRange);
            IsLoading = Visibility.Collapsed;
        }

        /// <summary>
        /// 页面编辑执行Undo操作的方法
        /// </summary>
        public async void Undo(PageEditHistory history)
        {
            switch (history.Type)
            {
                case ActionType.RightRotate:
                    var rightlist = history.SourceTargetValue.Keys.ToList<int>();
                    RotateSelectedPages(false, rightlist, true);
                    break;

                case ActionType.LeftRotate:
                    var leftlist = history.SourceTargetValue.Keys.ToList<int>();
                    RotateSelectedPages(true, leftlist, true);
                    break;

                case ActionType.InsertFromFile:
                case ActionType.Paste:
                    List<int> pageList = new List<int>();
                    for (int i = 0; i < history.InsertPageCount; i++)
                    {
                        pageList.Add(history.InsertIndex + i);
                    }
                    DoRemoveSelectedPages(pageList, true);
                    break;

                case ActionType.InsertCustomPages:
                    DoRemoveSelectedPages(new List<int> { history.InsertIndex }, true);
                    break;

                case ActionType.DragSort:
                    //将字典倒序后，将每个Source的值恢复到Key的位置
                    var SourceTargets = history.SourceTargetValue;
                    var keys = SourceTargets.Keys.ToArray();
                    Array.Reverse(keys);
                    foreach (var key in keys)
                    {
                        MoveItemToIndex(SourceTargets[key], key);
                    }
                    //刷新页码等
                    ReloadAfterOption(true, false, new Tuple<int, int>(0, PDFViewer.Document.PageCount));

                    List<int> selectedPages = new List<int>();
                    //将索引集合转换成页码集合
                    foreach (var key in SourceTargets.Keys)
                    {
                        selectedPages.Add(key + 1);
                    }
                    //通知UI选中Item
                    NotifyUIToRefresh(selectedPages);
                    break;

                case ActionType.Reverse:
                    //将字典倒序后，将每个Source的值恢复到Key的位置
                    var SourceTarget = history.SourceTargetValue;
                    var pres = SourceTarget.Keys.ToArray();
                    foreach (var key in pres)
                    {
                        if (key != SourceTarget[key])
                        {
                            ExchangeItem(key, SourceTarget[key]);
                        }
                    }

                    await Task.Delay(20);
                    //刷新页码等
                    ReloadAfterOption(true, false, null);

                    List<int> Pages = new List<int>();
                    //将索引集合转换成页码集合
                    foreach (var key in SourceTarget.Keys)
                    {
                        Pages.Add(key + 1);
                    }
                    foreach (var key in SourceTarget.Values)
                    {
                        Pages.Add(key + 1);
                    }
                    //通知UI选中Item
                    NotifyUIToRefresh(Pages);
                    break;

                default:
                    break;
            }
        }

        /// <summary>
        /// 页面编辑执行Redo操作的方法
        /// </summary>
        public async void Redo(PageEditHistory history)
        {
            switch (history.Type)
            {
                case ActionType.RightRotate:
                    var rightlist = history.SourceTargetValue.Keys.ToList<int>();
                    RotateSelectedPages(true, rightlist, true);
                    break;

                case ActionType.LeftRotate:
                    var leftlist = history.SourceTargetValue.Keys.ToList<int>();
                    RotateSelectedPages(false, leftlist, true);
                    break;

                case ActionType.InsertFromFile:
                    await InsertFromFile(history.InsertIndex, history.InsertFilePath, history.InsertFilePassWord, true);
                    ReloadAfterOption(true, false, Tuple.Create(history.InsertIndex - 1, history.InsertIndex + history.InsertPageCount));
                    break;

                case ActionType.InsertCustomPages:
                    InsertFromCustomPage(history.InsertIndex, history.PageSize.Width, history.PageSize.Height, history.InsertFilePath);
                    ListSelectedIndex = history.InsertIndex;
                    break;

                case ActionType.DragSort:
                    DragToSort(history.InsertIndex, history.SourceTargetValue.Keys.ToList<int>(), true);
                    break;

                case ActionType.Reverse:
                    var list = history.SourceTargetValue.Keys.ToList<int>().Union(history.SourceTargetValue.Values.ToList<int>()).ToList<int>();
                    DoReverse(list, true);
                    break;

                case ActionType.Paste:
                    paste(history.InsertIndex);
                    break;

                default:
                    break;
            }
        }

        /// <summary>
        /// 退出页面编辑面试，回到阅读页
        /// </summary>
        public void BackToPDFViewer(int PageIndex)
        {
            PDFViewer.GoToPage(PageIndex);
            viewContentViewModel.ExitToolMode();
        }

        /// <summary>
        /// 显示Toast提示
        /// </summary>
        private void ShowToast(string content = "")
        {
            if (!string.IsNullOrEmpty(content))
            {
                ToastText = content;
            }
            else
            {
                ToastText = App.MainPageLoader.GetString("OpentonFail_Warning");
            }
            ShowTip = Visibility.Visible;
        }

        /// <summary>
        /// 通知UI刷新页面范围
        /// 或通过xaml来设置选中项
        /// </summary>vb nmjvcx
        private void NotifyUIToRefresh(List<int> pageRange = null)
        {
            if (pageRange == null || pageRange.Count <= 0)
            {
                //通知UI刷新页面范围
                eventor.GetEvent<PageEditNotifyEvent>().Publish(new PageEditNotifyEventArgs(unicode));
            }
            else
            {
                //通知UI刷新页面范围
                eventor.GetEvent<PageEditNotifyEvent>().Publish(new PageEditNotifyEventArgs(unicode, NotifyType.SelectItems, pageRange));
            }
        }

        /// <summary>
        /// 获取已选中的页面集合
        /// </summary>
        /// <returns></returns>
        private List<int> getSelectedPage()
        {
            List<int> pages = new List<int>();
            for (int i = 0; i < PageEditItems.Count; i++)
            {
                if (PageEditItems[i].Selected)
                {
                    pages.Add(i);
                }
            }
            return pages;
        }

        /// <summary>
        /// 删除选中项的方法 不带Reload操作
        /// 方便其他逻辑中调用
        /// </summary>
        private void DoRemoveSelectedPages(List<int> pageList = null, bool isFromUndoRedo = false)
        {
            if (!viewContentViewModel.IAPBeforeFunction())
            {
                return;
            }

            List<int> indexList = new List<int>();
            if (pageList == null || pageList.Count < 0)
            {
                for (int i = 0; i < PageEditItems.Count; i++)
                {
                    if (PageEditItems[i].Selected)
                    {
                        indexList.Add(i);
                    }
                }

                //因为虚拟化 可能获取不到所有选中项的页码 需要结合选中项的集合判断一下
                if (selectedPageList.Count > 0 && selectedPageList.Count > indexList.Count)
                {
                    indexList = new List<int>();
                    for (int j = 0; j < selectedPageList.Count; j++)
                    {
                        indexList.Add(selectedPageList[j] - 1);
                    }
                }
            }
            else
            {
                indexList = pageList;
            }

            if (indexList.Count > 0 && indexList.Count == PDFViewer.Document.PageCount)
            {
                AlertsMessage alertsMessage = new AlertsMessage();
                alertsMessage.ShowDialog("", App.MainPageLoader.GetString("PageEdit_DeleteAllPage"), App.ServiceLoader.GetString("Text_ok"));
                return;
            }

            var result = PDFViewer.Document.RemovePages(indexList.ToArray());
            if (!result)
            {
                ShowToast();
                return;
            }

            //文档层操作成功后再删除UI层
            for (int i = indexList.Count - 1; i >= 0; i--)
            {
                PageEditItems.RemoveAt(indexList[i]);
            }

            if (!isFromUndoRedo)
            {
                ////清除页面编辑Undo，Redo栈
                //UndoStack.Clear();
                //RedoStack.Clear();
                //this.CanUndo = false;
                //this.CanRedo = false;
            }
        }

        /// <summary>
        /// 提取选中页面的方法
        /// </summary>
        /// <param name="isEveryPageToFile">是否每页生成一个文件</param>
        /// <param name="isDeleteAfterExtract">是否提取后删除页面</param>
        private async void DoExtractPages(bool isEveryPageToFile, bool isDeleteAfterExtract)
        {
            System.Windows.Forms.FolderBrowserDialog dialog = new System.Windows.Forms.FolderBrowserDialog();
            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                if (string.IsNullOrEmpty(dialog.SelectedPath))
                {
                    AlertsMessage alertsMessage = new AlertsMessage();
                    alertsMessage.ShowDialog("", App.MainPageLoader.GetString("OperationFailWarning"), App.ServiceLoader.GetString("Text_ok"));//补充提示文案
                    return;
                }
            }
            else
                return;

            string selectedfile = "";
            IsLoading = Visibility.Visible;
            await Task.Delay(3);
            List<int> pagenums = new List<int>();
            for (int i = 0; i < PageEditItems.Count; i++)
            {
                if (PageEditItems[i].Selected)
                {
                    pagenums.Add(PageEditItems[i].PageNumber);
                }
            }

            if (isEveryPageToFile)
            {
                //每页生成的单独的文件
                for (int i = 0; i < pagenums.Count; i++)
                {
                    string filename = PDFViewer.Document.FileName + " " + pagenums[i] + ".pdf";
                    string path = System.IO.Path.Combine(dialog.SelectedPath, filename);
                    path = CommonHelper.CreateFilePath(path);
                    selectedfile = path;
                    CPDFDocument savedoc = CPDFDocument.CreateDocument();
                    bool result = savedoc.ImportPages(PDFViewer.Document, pagenums[i].ToString());
                    if (!result)
                    {
                        savedoc.Release();
                        continue;
                    }
                    result = savedoc.WriteToFilePath(path);
                    if (!result)
                    {
                        savedoc.Release();
                        continue;
                    }
                    savedoc.Release();//释放内存
                }
            }
            else//全部生成一个文件
            {
                string filename = PDFViewer.Document.FileName + " " + CommonHelper.GetPageParmFromList(pagenums) + ".pdf";
                string path = System.IO.Path.Combine(dialog.SelectedPath, filename);
                path = CommonHelper.CreateFilePath(path);
                selectedfile = path;
                CPDFDocument savedoc = CPDFDocument.CreateDocument();
                string range = String.Join(",", pagenums);
                bool result = savedoc.ImportPages(PDFViewer.Document, range);
                if (!result)
                {
                    ShowToast();
                    IsLoading = Visibility.Collapsed;
                    return;
                }
                result = savedoc.WriteToFilePath(path);
                if (!result)
                {
                    ShowToast();
                }
                savedoc.Release();//释放内存
            }

            if (isDeleteAfterExtract)
            {
                DoRemoveSelectedPages();
                ReloadAfterOption(true, false, Tuple.Create(0, PDFViewer.Document.PageCount));
            }

            CommonHelper.ShowFileBrowser(selectedfile);
            IsLoading = Visibility.Collapsed;
        }

        private void DoSplitPages(HomePageSplitDialogModel model)
        {
            try
            {
                var pdfViewer = PDFViewer;

                System.Windows.Forms.FolderBrowserDialog dialog = new System.Windows.Forms.FolderBrowserDialog();
                //dialog.Description = App.MainPageLoader.GetString("Main_OpenFolderNoteWarning"); ;
                if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    if (string.IsNullOrEmpty(dialog.SelectedPath))
                    {
                        return;
                    }
                }
                else
                    return;

                var data = model;
                int PageCount = pdfViewer.Document.PageCount;
                string selectedfile = "";
                if (data.Mode == HomePageSplitDialogModel.SplitMode.AveragePages)
                {
                    int perPages = Convert.ToInt32(data.GetModeCount);
                    int SplitCount = (int)Math.Ceiling((double)PageCount / (double)perPages);
                    //TODO:命名规则是否要调整
                    selectedfile = data.FileName + " " + "1.pdf";
                    for (int i = 0; i < SplitCount; i++)
                    {
                        int startNum = i * perPages + 1;
                        int endNum = Math.Min(PageCount, (i + 1) * perPages);
                        string range = startNum.ToString() + "-" + endNum.ToString();
                        CPDFDocument savedoc = CPDFDocument.CreateDocument();
                        bool result = savedoc.ImportPages(pdfViewer.Document, range);
                        if (!result)
                        {
                            savedoc.Release();
                            continue;
                        }
                        string filename = data.FileName + " " + (i + 1) + ".pdf";
                        string path = System.IO.Path.Combine(dialog.SelectedPath, filename);
                        path = CommonHelper.CreateFilePath(path);
                        result = savedoc.WriteToFilePath(path);
                        if (!result)
                        {
                            savedoc.Release();
                            continue;
                        }
                        savedoc.Release();
                        selectedfile = path;
                    }
                }
                else if (data.Mode == HomePageSplitDialogModel.SplitMode.AverageFiles)
                {
                    int docCount = Convert.ToInt32(data.GetModeCount);
                    int avePages = (int)Math.Floor((double)PageCount / (double)docCount);
                    int remain = PageCount % docCount;
                    int startNum = 1;
                    //TODO:命名规则是否要调整
                    selectedfile = data.FileName + " " + "1.pdf";
                    for (int i = 0; i < docCount; i++)
                    {
                        int endNum = startNum + (avePages - 1);
                        if (i < remain) endNum++;
                        endNum = Math.Min(endNum, PageCount);
                        string range = startNum + "-" + endNum;
                        startNum = endNum + 1;
                        string fileName = data.FileName + " " + (i + 1) + ".pdf";
                        string path = System.IO.Path.Combine(dialog.SelectedPath, fileName);
                        path = CommonHelper.CreateFilePath(path);
                        CPDFDocument savedoc = CPDFDocument.CreateDocument();
                        bool result = savedoc.ImportPages(pdfViewer.Document, range);
                        if (!result)
                        {
                            savedoc.Release();
                            continue;
                        }
                        result = savedoc.WriteToFilePath(path);
                        if (!result)
                        {
                            savedoc.Release();
                            continue;
                        }
                        savedoc.Release();
                        selectedfile = path;
                    }
                }
                else//自定义页码范围
                {
                    string pageRange = "";
                    if (data.PageMode == HomePageSplitDialogModel.PageRangeMode.OddPage)
                    {
                        int[] page = new int[(PageCount + 1) / 2];
                        for (int i = 0; i < page.Length; i++)
                        {
                            page[i] = i * 2 + 1;
                        }
                        pageRange = string.Join(",", page);
                    }
                    else if (data.PageMode == HomePageSplitDialogModel.PageRangeMode.EvenPage)
                    {
                        int[] page = new int[PageCount / 2];
                        for (int i = 0; i < page.Length; i++)
                        {
                            page[i] = i * 2 + 2;
                        }
                        pageRange = string.Join(",", page);
                    }
                    List<int> pageList1 = new List<int>();
                    //如果是自定义输入页面范围的话，直接解析
                    CommonHelper.GetPagesInRange(ref pageList1, pageRange, PageCount, new char[] { ',' }, new char[] { '-' });
                    //part1
                    selectedfile = "";
                    CPDFDocument saveDoc1 = CPDFDocument.CreateDocument();
                    string filepath = data.FileName + " " + "1.pdf";
                    string path1 = Path.Combine(dialog.SelectedPath, filepath);
                    path1 = CommonHelper.CreateFilePath(path1);
                    bool result = saveDoc1.ImportPages(pdfViewer.Document, pageRange);
                    if (!result)
                    {
                        saveDoc1.Release();
                        ShowToast();
                        return;
                    }
                    result = saveDoc1.WriteToFilePath(path1);
                    if (!result)
                    {
                        saveDoc1.Release();
                        ShowToast();
                        return;
                    }
                    saveDoc1.Release();
                    //Part2
                    List<int> pageList2 = new List<int>();
                    for (int i = 1; i <= pdfViewer.Document.PageCount; i++)
                    {
                        if (!pageList1.Contains(i - 1))//pagelist1 存放的是index
                            pageList2.Add(i);
                    }
                    string pageRange2 = string.Join(",", pageList2);
                    CPDFDocument saveDoc2 = CPDFDocument.CreateDocument();
                    string filepath2 = data.FileName + " " + "2.pdf";
                    string path2 = Path.Combine(dialog.SelectedPath, filepath2);
                    path2 = CommonHelper.CreateFilePath(path2);
                    result = saveDoc2.ImportPages(pdfViewer.Document, pageRange2);
                    if (!result)
                    {
                        saveDoc2.Release();
                        ShowToast();
                        return;
                    }
                    result = saveDoc2.WriteToFilePath(path2);
                    if (!result)
                    {
                        saveDoc2.Release();
                        ShowToast();
                        return;
                    }
                    selectedfile = path1;
                    saveDoc2.Release();
                }
                //显示文件夹，并选中一个文件
                Process.Start("explorer", "/select,\"" + selectedfile + "\"");
            }
            catch (Exception ex)
            {
            }
        }

        /// <summary>
        /// 将文件插入到指定位置
        /// </summary>
        /// <param name="insertIndex"></param>
        public async Task<bool> InsertFromFile(int insertIndex, string filePath, string oldPassWord = null, bool isFromUndoRedo = false)
        {
            CPDFDocument doc = CPDFDocument.InitWithFilePath(filePath);
            if (doc == null)
            {
                ShowToast();
                return false;
            }
            string password = "";
            if (doc.IsLocked)
            {
                if (!string.IsNullOrEmpty(oldPassWord))
                {
                    var result = doc.UnlockWithPassword(oldPassWord);
                    if (result)
                    {
                        password = oldPassWord;
                    }
                }

                //没有传入密码，或者用传入密码解密失败是，需要弹出界面弹窗
                if (doc.IsLocked)
                {
                    DialogParameters value = new DialogParameters();
                    value.Add(ParameterNames.PDFDocument, doc);
                    bool result = true;
                    dialogs.ShowDialog(DialogNames.VerifyPassWordDialog, value, e =>
                     {
                         if (e.Result != ButtonResult.OK)
                         {
                             result = false;
                         }
                         password = e.Parameters.GetValue<string>(ParameterNames.PassWord);
                     });
                    if (!result)
                    {
                        return false;
                    }
                }
            }

            int pageCount = doc.PageCount;

            //插入整个新文档
            //文档层插入

            var insertresult = PDFViewer.Document.ImportPagesAtIndex(doc, "1-" + pageCount, insertIndex);
            if (!insertresult)
            {
                ShowToast();
                return false;
            }
            //插入成功后释放临时Document对象
            doc.Release();

            //UI层插入
            for (int i = 0; i < pageCount; i++)
            {
                var item = GetNewPageEditItem(i);
                PageEditItems.Insert(insertIndex + i, item);
            }

            //加一点延时才能显示选中效果
            await Task.Delay(200);
            List<int> pageRange = new List<int>();
            for (int i = 0; i < pageCount; i++)
            {
                pageRange.Add(insertIndex + i + 1);
            }
            NotifyUIToRefresh(pageRange);

            //如果是undo redo里调用本方法，则不需要添加到Undo栈
            if (!isFromUndoRedo)
            {
                //添加记录到Undo栈，清空Redo栈
                PageEditHistory history = new PageEditHistory();
                history.Type = ActionType.InsertFromFile;
                history.InsertIndex = insertIndex;
                history.InsertFilePath = filePath;
                history.InsertFilePassWord = password;
                history.InsertPageCount = pageCount;
                history.viewmodel = this;
                PDFViewer.UndoManager.AddHistory(history);
            }
            return true;
        }

        /// <summary>
        /// 插入自定义页面
        /// </summary>
        /// <param name="insertIndex"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <param name="filePath"></param>
        /// <returns></returns>
        private bool InsertFromCustomPage(int insertIndex, double width, double height, string filePath)
        {
            try
            {
                bool result = false;
                //文档层插入
                if (!string.IsNullOrEmpty(filePath))
                {
                    BitmapFrame frame = BitmapFrame.Create(new Uri(filePath));
                    byte[] imageData = new byte[frame.PixelWidth * frame.PixelHeight * 4];
                    frame.CopyPixels(imageData, frame.PixelWidth * 4, 0);
                    result = PDFViewer.Document.InsertPage(insertIndex, frame.Width, frame.Height, imageData, CPDFDocumentImageMode.CPDFDocumentImageModeScaleToFill);
                }
                else
                {
                    result = PDFViewer.Document.InsertPage(insertIndex, width, height, null);
                }
                if (!result)
                {
                    ShowToast();
                    return false;
                }
                PageEditItem item = new PageEditItem();
                item.Size = PDFViewer.Document.GetPageSize(insertIndex);
                PageEditItems.Insert(insertIndex, item);
                ReloadAfterOption(true, false, Tuple.Create(insertIndex - 1, insertIndex + 1));
                return true;
            }
            catch
            { return false; }
        }

        /// <summary>
        /// 根据索引创建新的Item
        /// </summary>
        /// <param name="index"></param>
        /// <returns></returns>
        private PageEditItem GetNewPageEditItem(int index)
        {
            PageEditItem item = new PageEditItem();
            if (PDFViewer.Document.PageAtIndex(index).Rotation % 2 != 0)
            {
                ///标记为横向页面
                item.isVertical = false;
            }
            item.PageNumber = index + 1;
            var pagesize = PDFViewer.Document.GetPageSize(index);
            item.Size = pagesize;
            //修复 缩放后粘贴的页面大小不一致的问题
            item.ItemSize = ItemSizes[ZoomIndex + 1];
            return item;
        }

        /// <summary>
        /// 进行文件操作后刷新PDFView
        /// 清除undo 栈
        /// 重加载Document
        /// 设置保存状态
        /// </summary>
        /// <param name="needRefreshPageNum">是否需要刷新页码</param>
        /// <param name="needClearUndoHistory">是否需要清空注释Undo栈</param>
        /// <param name="pageRange">需要刷新的页面范围图片</param>
        public void ReloadAfterOption(bool needRefreshPageNum = false, bool needClearUndoHistory = false, Tuple<int, int> pageRange = null, bool isScrollIntoView = false)
        {
            if (needRefreshPageNum)
            {
                RefreshPageNum();
            }
            if (needClearUndoHistory)
            {
                //只有删除操作清空undo栈
                //可能会引起注释模块联动问题 需要留意
                PDFViewer.UndoManager.ClearHistory();
            }
            if (pageRange != null)
            {
                if (pageRange.Item2 - pageRange.Item1 > 30)
                {
                    if (isScrollIntoView)
                    {
                        //插入后 滚动到 选中的页面
                        List<int> pageRanges = new List<int>() { pageRange.Item2 };
                        NotifyUIToRefresh(pageRanges);
                    }
                    else
                    {
                        //范围较大时，通知UI获取更准确的刷新范围
                        NotifyUIToRefresh();
                    }
                }
                else
                {
                    RefreshItemImage(pageRange.Item1, pageRange.Item2);
                    if(ListSelectedIndex == -1)
                    {
                        //插入后 滚动到 选中的页面
                        List<int> pageRanges = new List<int>() { pageRange.Item2 };
                        NotifyUIToRefresh(pageRanges);
                    }
                    
                }
            }
            PDFViewer.UndoManager.CanSave = true;
            PDFViewer.ReloadDocument();
            //解决：阅读页放大到只能看到最后一页时，从缩略图删除最后一页，阅读页面没有联动刷新
            if (PDFViewer.GetVerticalOffset() >= PDFViewer.GetExtendHeight())
            {
                PDFViewer.ScrollToVerticalOffset(PDFViewer.GetExtendHeight());
            }
        }

        /// <summary>
        /// 旋转所有选中页面
        /// </summary>
        /// <param name="rightRotate"></param>
        private async void RotateSelectedPages(bool rightRotate = true, List<int> pageitems = null, bool isFromUndoRedo = false)
        {
            if (!viewContentViewModel.IAPBeforeFunction())
            {
                return;
            }

            IsLoading = Visibility.Visible;
            await Task.Delay(2);
            Dictionary<int, int> items = new Dictionary<int, int>();
            if (pageitems == null)
            {
                //旋转选中页面
                for (int i = 0; i < PageEditItems.Count; i++)
                {
                    if (PageEditItems[i].Selected)
                    {
                        //逆时针旋转传 - 1  顺时针旋转传1
                        //直接用PDFViewer的旋转接口，需要留意好，中间层不能有自动清空undo栈
                        PDFViewer.RotatePage(ComPDFKitViewer.PageRotate.Rotate90, rightRotate, i);
                        items.Add(i, i);
                        //重新拿图
                        PageEditItems[i].IsGetImage = false;
                    }
                }
            }
            else
            {
                //旋转对应Items集合
                for (int i = 0; i < pageitems.Count; i++)
                {
                    PDFViewer.RotatePage(ComPDFKitViewer.PageRotate.Rotate90, rightRotate, pageitems[i]);
                    items.Add(pageitems[i], pageitems[i]);

                    //重新拿图
                    PageEditItems[pageitems[i]].IsGetImage = false;
                }
            }

            //旋转页面后取消选中
            PDFViewer.ClearSelectPDFEdit(true);

            //如果是undo,Redo里调用的方法，则不记录到栈里
            if (!isFromUndoRedo)
            {
                //记录进Undo栈
                PageEditHistory history = new PageEditHistory();
                history.Type = rightRotate ? ActionType.RightRotate : ActionType.LeftRotate;
                history.SourceTargetValue = items;
                history.viewmodel = this;
                PDFViewer.UndoManager.AddHistory(history);
            }

            ReloadAfterOption(false, false, Tuple.Create(items.Keys.First(), items.Keys.Last()));
            IsLoading = Visibility.Collapsed;
        }

        /// <summary>
        /// 刷新页码
        /// </summary>
        private void RefreshPageNum()
        {
            for (int i = 0; i < PageEditItems.Count; i++)
            {
                PageEditItems[i].PageNumber = i + 1;
                PageEditItems[i].ShowPageSize = ShowedPageSize == Visibility.Visible ? true : false;
            }
        }

        /// <summary>
        /// 刷新页面范围下拉框
        /// </summary>
        private void RefreshPageRangeItem()
        {
            PageRangeItems.Clear();
            PageRangeItems.Add(App.MainPageLoader.GetString("WritableComboBox_AllPage"));
            PageRangeItems.Add(App.MainPageLoader.GetString("WritableComboBox_OddPage"));
            PageRangeItems.Add(App.MainPageLoader.GetString("WritableComboBox_EvenPage"));
            PageRangeItems.Add("Horizontal Page");
            PageRangeItems.Add("Vertical Page");
            PageRangeItems.Add(App.MainPageLoader.GetString("WritableComboBox_CustomRangeEge"));
        }

        /// <summary>
        /// 选中目标页面范围的页面
        /// </summary>
        /// <param name="index">页面范围选中项索引</param>
        private async void SuitPageRange(int index)
        {
            List<int> pageRange = new List<int>();
            switch (index)
            {
                case 0:
                    for (int i = 0; i < PageEditItems.Count; i++)
                    {
                        pageRange.Add(i + 1);
                    }
                    break;

                case 1:
                    //奇数页
                    //先清空所有选项
                    ListSelectedIndex = -1;
                    for (int i = 0; i < PageEditItems.Count; i++)
                    {
                        if (i % 2 == 0)
                        {
                            pageRange.Add(i + 1);
                        }
                    }
                    break;

                case 2:
                    //偶数页
                    //先清空所有选项
                    ListSelectedIndex = -1;
                    for (int i = 0; i < PageEditItems.Count; i++)
                    {
                        if (i % 2 != 0)
                        {
                            pageRange.Add(i + 1);
                        }
                    }
                    break;

                case 3://横向页面
                    //先清空所有选项
                    ListSelectedIndex = -1;
                    for (int i = 0; i < PageEditItems.Count; i++)
                    {
                        if (!PageEditItems[i].isVertical)
                        {
                            pageRange.Add(i + 1);
                        }
                    }
                    break;

                case 4://纵向页面
                    for (int i = 0; i < PageEditItems.Count; i++)
                    {
                        if (PageEditItems[i].isVertical)
                        {
                            pageRange.Add(i + 1);
                        }
                    }
                    break;

                case 5://自定义
                    TxtPageInputVisibility = Visibility.Visible;
                    await Task.Delay(30);
                    TbPageRange = "";
                    break;

                default:
                    break;
            }
            if (pageRange.Count > 0)
            {
                //避免在下面的过程中频繁触发SelectionChanged事件
                IsSelectFormSelf = true;
                NotifyUIToRefresh(pageRange);
                IsSelectFormSelf = false;
            }
            else
            {
                //选中了下拉框的选项
                //增加条件，修复全选页面，但是ctrl点选取消后，选中状态不准确问题
                if (index != -1)
                {
                    //没有符合条件时 清空选中项
                    ListSelectedIndex = -1;
                }
            }
        }

        /// <summary>
        /// 是否显示页面尺寸
        /// </summary>
        /// <param name="show">是或否</param>
        private void ShowPageSize()
        {
            bool show = true;
            if (ShowedPageSize == Visibility.Visible)
            {
                show = false;
                ShowedPageSize = Visibility.Collapsed;
            }
            else
            {
                show = true;
                ShowedPageSize = Visibility.Visible;
            }
            for (int i = 0; i < PageEditItems.Count; i++)
            {
                PageEditItems[i].ShowPageSize = show;
            }
        }

        /// <summary>
        /// 从PDFView获取所有Items集合
        /// </summary>
        public void GetSourceItems(bool isFirstLoad)
        {
            if (isFirstLoad || IsBOTAThumb == Visibility.Visible)
            {
                PageEditItems.Clear();
                for (int i = 0; i < PDFViewer.Document.PageCount; i++)
                {
                    var item = GetNewPageEditItem(i);
                    PageEditItems.Add(item);
                }
            }
            //else
            //{
            //    //后续进来仅刷新图片即可
            //    for (int i = 0; i < PageEditItems.Count; i++)
            //    {
            //        PageEditItems[i].IsGetImage = false;
            //    }
            //}
        }

        /// <summary>
        /// 刷新书签列表
        /// </summary>
        public void RefreshBookMarkList()
        {
            if (PDFViewer != null)
            {
                var booklist = PDFViewer.Document.GetBookmarkList();
                if (booklist == null)
                {
                    return;
                }
                //获取所有书签的Index集合
                List<int> marks = new List<int>();
                for (int i = 0; i < booklist.Count; i++)
                {
                    marks.Add(booklist[i].PageIndex);
                }

                //不能只遍历marks集合，考虑书签集合元素删除的情况
                for (int k = 0; k < PageEditItems.Count; k++)
                {
                    if (marks.Contains(k))
                        PageEditItems[k].HaveBookMark = true;
                    else
                        PageEditItems[k].HaveBookMark = false;
                }
            }
        }

        /// <summary>
        /// 刷新指定范围的图片
        /// </summary>
        /// <param name="startIndex"></param>
        /// <param name="endIndex"></param>
        private async void RefreshItemImage(int startIndex, int endIndex)
        {
            if (PDFViewer == null || PDFViewer.Document == null)
            {
                return;
            }

            //一个拿图比例系数，减少拿图耗时，尽量确保缩放后图片清晰度不会很差
            int rate = (int)ItemSizes[2].Height;

            for (int i = startIndex; i <= endIndex; i++)
            {
                if (i <= PageEditItems.Count - 1 && i >= 0 && PageEditItems.Count > 0 && PDFViewer.Document != null && rate > 0)
                {
                    //先更新一次每个页面的尺寸 确保图的方向正确
                    PageEditItems[i].Size = PDFViewer.Document.GetPageSize(i);
                    if (PageEditItems[i].Size.Width <= 0 || PageEditItems[i].Size.Height <= 0)
                    {
                        //补充判空逻辑，避免崩溃
                        continue;
                    }
                    //宽高为样式中图片控件宽高
                    if (PageEditItems[i].isVertical)
                    {
                        //等比例缩小
                        if (PageEditItems[i].Size.Height > rate)
                        {
                            await PDFViewer.GetThumbnail(i, (int)(PageEditItems[i].Size.Width / (PageEditItems[i].Size.Height / rate)), rate);
                        }
                        else
                        {
                            //尺寸大小的图片 等比例放大  避免页面放大后内容模糊
                            await PDFViewer.GetThumbnail(i, (int)PageEditItems[i].Size.Width * (rate / (int)PageEditItems[i].Size.Height), rate);
                        }
                    }
                    else
                    {
                        if (PageEditItems[i].Size.Width > rate)
                        {
                            await PDFViewer.GetThumbnail(i, rate, (int)(PageEditItems[i].Size.Height / (PageEditItems[i].Size.Width / rate)));
                        }
                        else
                        {
                            //获取横图
                            await PDFViewer.GetThumbnail(i, rate, (int)PageEditItems[i].Size.Height * (rate / (int)(PageEditItems[i].Size.Width)));
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 拖拽排序功能
        /// </summary>
        /// <param name="targetIndex"></param>
        /// <param name="pageIndexs"></param>
        public void DragToSort(int targetIndex, List<int> pageIndexs, bool IsFromUndoRedo = false)
        {
            DragSorting = true;
            //拖拽排序后需要重新选中项的集合
            List<int> selectedPages = new List<int>();

            //记录原位置和目标位置的字典，用于Undo，Redo恢复
            Dictionary<int, int> SourceTargetValue = new Dictionary<int, int>();

            bool result = false;

            //排序前，先对所有页码排序
            pageIndexs.Sort();
            //要考虑每一次交换都会导致局部页码发生改变
            //每次整体往后移动时，先移动大页码；整体往前移动时，先移动小页码；往中间移动时，再按上述两种情况分别移动
            if (targetIndex <= pageIndexs[0])
            {
                for (int i = 0; i < pageIndexs.Count; i++)
                {
                    // list.Add(PageEditListBox.Items[pageIndexs[i]] as ListBoxItem);
                    //sourceindex.Add(pageIndexs[i]);
                    result = MoveItemToIndex(pageIndexs[i], targetIndex + i);
                    if (!result)
                    {
                        DragSorting = false;
                        return;
                    }
                    SourceTargetValue.Add(pageIndexs[i], targetIndex + i);
                    selectedPages.Add(targetIndex + i + 1);
                }
            }
            else if (targetIndex > pageIndexs[pageIndexs.Count - 1])
            {
                //目标位置在所有选中内容右边 整体后移
                for (int i = 0; i < pageIndexs.Count; i++)
                {
                    result = MoveItemToIndex(pageIndexs[pageIndexs.Count - 1 - i], targetIndex - 1 - i);
                    if (!result)
                    {
                        DragSorting = false;
                        return;
                    }
                    SourceTargetValue.Add(pageIndexs[pageIndexs.Count - 1 - i], targetIndex - 1 - i);
                    selectedPages.Add(targetIndex - i);
                }
            }
            else//目标位置在所有选中项中间
            {
                int i, j, k;
                //找出PageEditListBox.Items中页码等于destpage的下标
                for (k = 0; k < pageIndexs.Count - 1; k++)
                {
                    //这里要算入K---即前面部分的页面个数
                    if (pageIndexs[k] < targetIndex && pageIndexs[k + 1] >= targetIndex)
                    {
                        break;
                    }
                }

                //局部往后移动
                for (i = 0; i <= k; i++)
                {
                    result = MoveItemToIndex(pageIndexs[k - i], targetIndex - 1 - i);
                    if (!result)
                    {
                        DragSorting = false;
                        return;
                    }
                    SourceTargetValue.Add(pageIndexs[k - i], targetIndex - 1 - i);
                    selectedPages.Add(targetIndex - i);
                }
                int newIndex = targetIndex;
                //局部往前移动
                for (j = i; j < pageIndexs.Count; j++)
                {
                    result = MoveItemToIndex(pageIndexs[j], newIndex);
                    if (!result)
                    {
                        DragSorting = false;
                        return;
                    }
                    SourceTargetValue.Add(pageIndexs[j], newIndex);
                    selectedPages.Add(newIndex + 1);
                    newIndex++;
                }
            }
            DragSorting = false;

            //刷新页码和图片
            ReloadAfterOption(true, false, new Tuple<int, int>(0, PDFViewer.Document.PageCount));
            //先刷新页码再选中item，顶部的选中页面更准确
            //通知UI选中Items
            NotifyUIToRefresh(selectedPages);

            if (!IsFromUndoRedo)
            {
                //存入Undo栈
                PageEditHistory history = new PageEditHistory();
                history.Type = ActionType.DragSort;
                history.SourceTargetValue = SourceTargetValue;
                //用于Redo恢复
                history.InsertIndex = targetIndex;
                history.viewmodel = this;
                PDFViewer.UndoManager.AddHistory(history);
            }
        }

        /// <summary>
        /// 移动某个Item到指定位置
        /// </summary>
        private bool MoveItemToIndex(int sourceindex, int targetindex)
        {
            if (targetindex == sourceindex || targetindex < 0)
            {
                return false;
            }
            //文档层移动
            var result = PDFViewer.Document.MovePage(sourceindex, targetindex);
            if (!result)
            {
                return false;
            }

            //UI层移动
            var source = PageEditItems[sourceindex];
            PageEditItems.RemoveAt(sourceindex);
            PageEditItems.Insert(targetindex, source);

            if (PDFViewer.CurrentIndex == sourceindex)
            {
                PDFViewer.GoToPage(targetindex);
            }
            return true;
        }

        /// <summary>
        /// 从底层库获取对应页面的图片
        /// </summary>
        /// <param name="pageIndex"></param>
        /// <param name="thumb"></param>
        /// <param name="w"></param>
        /// <param name="h"></param>
        private void PDFViewer_OnThumbnailGenerated(int pageIndex, byte[] thumb, int w, int h)
        {
            try
            {
                if (PageEditItems.Count >= pageIndex + 1)
                {
                    PixelFormat fmt = PixelFormats.Bgra32;
                    BitmapSource bps = BitmapSource.Create(w, h, 96.0, 96.0, fmt, null, thumb, (w * fmt.BitsPerPixel + 7) / 8);
                    PageEditItems[pageIndex].Image = bps;
                    PageEditItems[pageIndex].IsGetImage = true;
                }
            }
            catch
            {
            }
        }

        #endregion 方法

        #region Navigate

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
        }

        /// <summary>
        /// 从其他页面导航过来的时候会触发
        /// 考虑只有在页面编辑的时候会进行页面的删减,可以尝试逻辑优化:仅第一次进入页面编辑时重新刷新页面
        /// </summary>
        /// <param name="navigationContext"></param>
        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            navigationContext.Parameters.TryGetValue<ViewContentViewModel>(ParameterNames.ViewContentViewModel, out viewContentViewModel);
            navigationContext.Parameters.TryGetValue<CPDFViewer>(ParameterNames.PDFViewer, out PDFViewer);
            bool isBOTA = false;
            navigationContext.Parameters.TryGetValue<bool>(ParameterNames.BOTAThumb, out isBOTA);
            if (PDFViewer != null)
            {
                if (isFirstLoad)
                {
                    PDFViewer.OnThumbnailGenerated -= PDFViewer_OnThumbnailGenerated;
                    PDFViewer.OnThumbnailGenerated += PDFViewer_OnThumbnailGenerated;
                    PDFViewer.InfoChanged -= PDFViewer_InfoChanged;
                    PDFViewer.InfoChanged += PDFViewer_InfoChanged;
                    PDFViewer.AnnotEditHandler -= PDFViewer_AnnotEditHandler;
                    PDFViewer.AnnotEditHandler += PDFViewer_AnnotEditHandler;

                    ZoomIndex = 0;
                }
                //BOTA缩略图时，显示不同的菜单栏
                if (isBOTA)
                {
                    IsBOTAThumb = Visibility.Visible;
                    ShowedPageSize = Visibility.Collapsed;
                    HidePageSize = Visibility.Collapsed;
                }
                else
                {
                    IsBOTAThumb = Visibility.Collapsed;
                }

                //每次进入页面编辑都刷新item个数，缩略图删减时，可以更新item
                //需要留意大文档性能
                GetSourceItems(true);

                //清空一下选中项，修复进入页面编辑后仍然选中多页的问题
                ListSelectedIndex = -1;
                ListSelectedIndex = PDFViewer.CurrentIndex;
                //页面编辑取消显示书签Icon
                //RefreshBookMarkList();
                isFirstLoad = false;
            }
        }

        private void PDFViewer_AnnotEditHandler(object sender, List<ComPDFKitViewer.AnnotEvent.AnnotEditEvent> e)
        {
            if (e != null && e.Count > 0 && IsBOTAThumb == Visibility.Visible)
            {
                //缩略图模式下 刷新页面
                int pageIndex = e[0].PageIndex;
                RefreshItemImage(pageIndex, pageIndex);
            }
        }

        private void PDFViewer_InfoChanged(object sender, KeyValuePair<string, object> e)
        {
            if (e.Key == "PageNum" && !viewContentViewModel.isInPageEdit)
            {
                NotifyUIToRefresh(new List<int> { (e.Value as ComPDFKitViewer.RenderData).PageIndex });
            }
        }

        #endregion Navigate
    }
}