PDFOffice_Windows_exe/PDF Office/Views/PageEdit/PageEditContent.xaml.cs

using ComPDFKit.PDFDocument;
using ComPDFKitViewer.PdfViewer;
using ImTools;
using PDF_Master.EventAggregators;
using PDF_Master.Helper;
using PDF_Master.Model.PageEdit;
using PDF_Master.ViewModels.PageEdit;
using Prism.Events;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
using WpfToolkit.Controls;
using static Dropbox.Api.TeamLog.AdminAlertSeverityEnum;

namespace PDF_Master.Views.PageEdit
{
    /// <summary>
    /// PageEditContent.xaml 的交互逻辑
    /// </summary>
    public partial class PageEditContent : UserControl
    {
        /// <summary>
        /// 用于通知刷新图片的事件
        /// 因为目前的图片刷新策略依赖很多UI事件判断，因为将主要判断逻辑放在UI层，VM负责图片刷新，非必要情况尽量不要采用这种形式
        /// </summary>
        private IEventAggregator eventor;

        /// <summary>
        /// 暂存的唯一索引值,用于区分多页签
        /// </summary>
        private string unicode;

        /// <summary>
        /// 是否是加载时第一次触发滚动
        /// </summary>
        private bool isFirstScrollChange = true;

        /// <summary>
        /// 用于判断滚轮停止的计时器
        /// </summary>
        private DispatcherTimer timer = new DispatcherTimer();

        /// <summary>
        /// 判断是否开始框选
        /// </summary>
        private bool startChoose = false;

        /// <summary>
        /// 框选的起始位置
        /// </summary>
        private Point starPosition = new Point();

        /// <summary>
        /// 记录当前滑块的状态
        /// </summary>
        private ScrollEventType scrolltype = ScrollEventType.EndScroll;

        //鼠标点击时在item中的位置  实现类似点哪拖哪的细节
        private double item_x;

        private double item_y;

        //插入标记代表的插入位置
        private int InsertIndex = -1;

        //拖动的Item
        private PageEditItem tempItem;

        /// <summary>
        /// 是否正在拖拽排序中，通过该变量避免单击触发拖动
        /// </summary>
        private bool isDraging = false;

        //是否正在从外部拖入文件
        public bool isDragingEnter { get; set; } = false;

        /// <summary>
        /// 是否需要自动滚动
        /// </summary>

        private bool needScroll = false;

        //自动滚动速度
        private int speed = 0;

        private PageEditContentViewModel viewModel;

        private List<string> dropMoveFiles = null;

        public PageEditContent()
        {
            InitializeComponent();
            dropMoveFiles = new List<string>();
        }

        public PageEditContent(IEventAggregator eventAggregator) : this()
        {
            eventor = eventAggregator;
            unicode = App.mainWindowViewModel.SelectedItem.Unicode;

            timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromSeconds(0.3);
            timer.Tick += Timer_Tick;

            viewModel = this.DataContext as PageEditContentViewModel;

            viewModel.PageEditItems.CollectionChanged += PageEditItems_CollectionChanged;

            //订阅页面刷新事件
            eventor.GetEvent<PageEditNotifyEvent>().Subscribe(OneNotifyEvent, e => e.Unicode == unicode);
            eventAggregator.GetEvent<CleanSelectAllEvent>().Subscribe(CleanSelectAll, e => e.Unicode == unicode);

            //当退出页面编辑后
            //缩略图选中页面，要和当前显示的页面，一致
            eventAggregator.GetEvent<PageEditSelectedItemEvent>().Subscribe(OnPageEditSelectedItemRefreshEvent, e => e.Unicode == unicode);
        }

        private void OnPageEditSelectedItemRefreshEvent(PageEditSelectedItemEventArgs args)
        {
            if (viewModel.IsBOTAThumb == Visibility.Visible && args.SelectedItemIndex != -1)
            {
                viewModel.ListSelectedIndex = args.SelectedItemIndex;
                ListPageEdit.ScrollIntoView(ListPageEdit.SelectedItem);
            }
        }

        private void Timer_Tick(object sender, EventArgs e)
        {
            PulishEvent();
            timer?.Stop();
        }

        private void PageEditItems_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
        {
            //加入loaded判断，避免显示前频繁进入该事件，影响BOTA切换事件
            if (this.IsLoaded)
            {
                //未选 显示页面大小，插入文件后 会影响
                //if (viewModel.IsShowPageSize)
                //{
                //    viewModel.ShowedPageSize = Visibility.Visible;
                //    viewModel.HidePageSize = Visibility.Collapsed;
                //}
                //else
                //{
                //    viewModel.ShowedPageSize = Visibility.Collapsed;
                //    viewModel.HidePageSize = Visibility.Visible;
                //}
                //BOTA缩略图里 插入子项时，刷新子项大小
                if (GridBOTAHeader.Visibility == Visibility.Visible && e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
                {
                    ItemSuitAcutalWidth(this.ActualWidth);
                }
                //补充判断条件，修复页数多的文档，在BOTA展开的情况下，切换到页面编辑会卡死的问题
                if (GridBOTAHeader.Visibility != Visibility.Visible && !viewModel.Initializing)
                {
                    //页面编辑模式下，页面总数变化后用于通知BOTA面板进行数据集刷新
                    //只需要页面编辑通知缩略图，不需要缩略图通知页面编辑，因为现在每次导航进去时都会刷新item个数
                    eventor.GetEvent<PageEditNotifyEvent>().Publish(new PageEditNotifyEventArgs(unicode, NotifyType.PageCountChanged));
                }
            }
        }

        private void OneNotifyEvent(PageEditNotifyEventArgs e)
        {
            switch (e.Type)
            {
                case NotifyType.RefreshPage:
                    //计算当前区域的页面范围后传递回VM
                    PulishEvent();
                    break;

                case NotifyType.SelectItems:
                    //根据Vm的参数选中部分页面
                    if (e.PageRange.Count == 1)
                    {
                        ListPageEdit.SelectedIndex = e.PageRange[0] - 1;
                        ListPageEdit.ScrollIntoView(ListPageEdit.SelectedItem);

                        //缩略图 复制粘贴后，选中页面，要与阅读视图 对应
                        if (viewModel.viewContentViewModel.isInPageEdit == false && GridBOTAHeader.Visibility == Visibility.Visible)
                        {
                            viewModel.PDFViewer.GoToPage(ListPageEdit.SelectedIndex);
                        }
                    }
                    else
                    {
                        ListPageEdit.SelectedItems.Clear();
                        for (int i = 0; i < e.PageRange.Count; i++)
                        {
                            if (e.PageRange[i] - 1 < ListPageEdit.Items.Count)
                            {
                                ListPageEdit.SelectedItems.Add(ListPageEdit.Items[e.PageRange[i] - 1]);
                                //页码 下拉框 ，选择全选页面、奇数、偶数等情况，偶现IsMultiSelected=false，这里先强制设置一下
                                viewModel.IsMultiSelected = true;
                            }
                            ListPageEdit.ScrollIntoView(ListPageEdit.SelectedItem);
                        }
                    }
                    break;

                case NotifyType.PageCountChanged:
                    if (GridBOTAHeader.Visibility == Visibility.Visible)
                    {
                        viewModel?.GetSourceItems(false);
                    }
                    break;

                default:
                    break;
            }
        }

        private void CleanSelectAll(CleanSelectAllArgs obj)
        {
            ListPageEdit.SelectedItems.Clear();
            ListPageEdit.SelectedIndex = viewModel.PDFViewer.CurrentIndex;
        }

        #region UI事件

        /// <summary>
        /// 每次显示的时候就触发事件，刷新所有图片
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void PageEdit_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if ((bool)e.NewValue)
            {
                //BOTA缩略图模式 需要先计算item宽度，再进行渲染页面的计算
                if (GridBOTAHeader.Visibility == Visibility.Visible)
                {
                    ItemSuitAcutalWidth(this.ActualWidth);
                }
                //当前页面没有发生变化时，刷新图片 这种情况下会拿两次图，需要留意
                PulishEvent();
                //当前页面发生变化时通过ScrollChanged事件来刷新图片
                isFirstScrollChange = true;
            }
        }

        /// <summary>
        /// 鼠标滚轮滚动时触发的事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void ListPageEdit_ScrollChanged(object sender, ScrollChangedEventArgs e)
        {
            if (isFirstScrollChange)
            {
                PulishEvent();//第一次加载时触发的Scollchange 直接刷新界面，减少白板显示时间
                isFirstScrollChange = false;
                return;
            }
            else
            {
                if (e.VerticalChange != 0)
                    timer?.Start();//暂时找不到比较好的 判断Scroller停止的方法，先用计时器粗略判断
            }
        }

        /// <summary>
        /// 拖动右侧滑块时触发的事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ListPageEdit_Scroll(object sender, System.Windows.Controls.Primitives.ScrollEventArgs e)
        {
            scrolltype = e.ScrollEventType;
            if (scrolltype != System.Windows.Controls.Primitives.ScrollEventType.EndScroll)
            {
                timer?.Stop();
                return;
            }
            PulishEvent();
        }

        #endregion UI事件

        #region 方法

        /// <summary>
        /// 发布事件
        /// </summary>
        public void PulishEvent()
        {
            //判空 避免某些乱七八糟的情况下异常
            if (ListPageEdit != null & ListPageEdit.Items.Count > 0)
            {
                var itemSize = new Size((ListPageEdit.Items[0] as PageEditItem).ItemSize.Width + 32, (ListPageEdit.Items[0] as PageEditItem).ItemSize.Height + 30);
                var range = GetRoughFromView(ListPageEdit, itemSize, new Thickness(5, 10, 5, 10));
                if ((bool)TbnTwoLine.IsChecked)
                {
                    ///双列模式下要计算两列item
                    range = new Tuple<int, int, int>(range.Item1, range.Item2 * 2, range.Item3);
                }
                eventor.GetEvent<PageEditRefreshEvent>().Publish(new PageEditRefreshEventArgs() { Unicode = unicode, PageRange = range });
            }
        }

        /// <summary>
        /// 获取滑轨的垂直偏移量，结合item总数和Item尺寸以及间隔，来估算实际展示的item范围
        /// 返回值为页面范围  从1开始
        /// </summary>
        /// <param name="view"></param>
        /// <param name="itemSize"></param>
        /// <param name="itemMargin"></param>
        /// <returns></returns>
        private Tuple<int, int, int> GetRoughFromView(ListBox view, Size itemSize, Thickness itemMargin)
        {
            //var scrollViewer = GetScrollHost(view);
            var scrollViewer = CommonHelper.FindVisualChild<ScrollViewer>(view);
            if (scrollViewer == null || scrollViewer.ActualHeight == 0 || scrollViewer.ActualWidth == 0)//视图展开
                return new Tuple<int, int, int>(0, 0, 0);
            try
            {
                var currentHeight = scrollViewer.ActualHeight - view.Padding.Top;
                var currentWidth = scrollViewer.ActualWidth;
                //计算当前窗口大小能显示的行数和列数
                var columnCount = (int)(currentWidth / (itemSize.Width + itemMargin.Left));
                var rowCount = (int)Math.Ceiling(currentHeight / (itemSize.Height + itemMargin.Bottom));

                var preItemCount = (int)((scrollViewer.VerticalOffset / scrollViewer.ExtentHeight) * ((view.Items.Count + columnCount - 1) / columnCount));//滑动百分比*行数 = 大概的垂直位置
                preItemCount = preItemCount * columnCount;
                var preEnd = (int)(((scrollViewer.VerticalOffset + scrollViewer.ActualHeight) / scrollViewer.ExtentHeight) * ((view.Items.Count + columnCount - 1) / columnCount));
                preEnd = preEnd * columnCount + columnCount - 1;

                var middle = (int)Math.Ceiling(preItemCount + preEnd / 2d);

                return new Tuple<int, int, int>(
                    Math.Max(preItemCount, 0),
                    Math.Min(view.Items.Count, preEnd),
                    middle);
            }
            catch { }
            return new Tuple<int, int, int>(0, 0, 0);
        }

        /// <summary>
        /// 获取listbox里的ScrollViewer对象
        /// 留意如果有重写ListBox对象,该方法可能无效
        /// </summary>
        /// <param name="listBox"></param>
        /// <returns></returns>
        private ScrollViewer GetScrollHost(ListBox listBox)
        {
            if (VisualTreeHelper.GetChildrenCount(listBox) > 0)
            {
                int s = VisualTreeHelper.GetChildrenCount(listBox);

                Border border = VisualTreeHelper.GetChild(listBox, 0) as Border;
                if (border != null)
                {
                    return VisualTreeHelper.GetChild(border, 0) as ScrollViewer;
                }
            }
            return null;
        }

        #endregion 方法

        /// <summary>
        /// 输入框显示时，自动获取焦点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void TextBox_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if ((bool)e.NewValue)
            {
                (sender as Control).Focus();
            }
        }

        private void ListPageEdit_PreviewMouseMove(object sender, MouseEventArgs e)
        {
            try
            {
                if (e.LeftButton == MouseButtonState.Pressed && !isDragingEnter)
                {
                    //鼠标框选逻辑
                    if (startChoose)
                    {
                        var position = e.GetPosition(ListPageEdit);
                        if (position.X < 5 || position.X > ListPageEdit.ActualWidth - 5 || position.Y < 5 || position.Y > ListPageEdit.ActualHeight - 5)
                        {
                            startChoose = false;
                            RectChoose.Visibility = Visibility.Collapsed;
                            //暂时未想到靠近顶部和底部自动翻滚的好方法，只能先屏蔽这部分功能
                            Mouse.Capture(null);
                            return;
                        }
                        //矩形框内的item设为选中
                        DoSelectItems();
                        return;
                    }
                    //拖拽排序的逻辑
                    else
                    {
                        var pos = e.GetPosition(ListPageEdit);
                        if (pos.Y < 0 || pos.Y > ListPageEdit.ActualHeight)
                        {
                            LineInset.Visibility = Visibility.Collapsed;
                            ImgPicture.Visibility = Visibility.Collapsed;
                            return;
                        }
                        HitTestResult result = VisualTreeHelper.HitTest(ListPageEdit, pos);
                        if (result == null)
                        {
                            return;
                        }
                        var listBoxItem = CommonHelper.FindVisualParent<ListBoxItem>(result.VisualHit);
                        if (listBoxItem == null)
                        {
                            return;
                        }
                        isDragingEnter = false;
                        tempItem = listBoxItem.DataContext as PageEditItem;

                        var item_pos = e.GetPosition(listBoxItem);
                        if (item_pos != null)
                        {
                            item_x = item_pos.X;
                            item_y = item_pos.Y;
                        }

                        //string filename = Guid.NewGuid().ToString() + ".pdf";
                        //string tempPath = System.IO.Path.Combine(System.IO.Path.GetTempPath(), filename);
                        //System.IO.File.Create(tempPath);
                        //string[] files = new string[1];
                        //files[0] = tempPath;
                        var scroll = GetScrollHost(ListPageEdit);

                        //页面 是App内的拖拽 ，还是拖拽 页面 出 App 是一起处理

                        //将付费锁逻辑提前，避免拖拽出窗体成功
                        if (!ServiceHelper.IAPBeforeFunction())
                        {
                            return;
                        }

                        #region 拖拽 页面 到 桌面/文件夹 ，提取文件

                        //C:\Users\oyxh\AppData\Local\Temp\
                        string dir = System.IO.Path.Combine(System.IO.Path.GetTempPath());
                        if (!System.IO.Directory.Exists(dir))
                        {
                            System.IO.Directory.CreateDirectory(dir);
                        }

                        //string tempPath = System.IO.Path.Combine(System.IO.Path.GetTempPath(), filename);

                        List<int> pages = GetSelectedItems();
                        pages.Sort();

                        string[] files = new string[1];
                        if (pages.Count > 0)
                        {
                            //多选页面 提取成一个文件夹

                            string filename = viewModel.PDFViewer.Document.FileName + " " + CommonHelper.GetPageParmFromList(pages) + ".pdf";
                            string tempPath = System.IO.Path.Combine(dir, filename);
                            //删除 临时文件的同名文件
                            if (File.Exists(tempPath))
                            {
                                File.Delete(tempPath);
                            }
                            string path = CommonHelper.CreateFilePath(tempPath);
                            files[0] = path;
                            dropMoveFiles.Add(path);
                            CPDFDocument savedoc = CPDFDocument.CreateDocument();
                            string range = String.Join(",", pages);
                            bool result1 = savedoc.ImportPages(viewModel.PDFViewer.Document, range);
                            //if (!result1)
                            //{
                            //    viewModel.ShowToast();
                            //    viewModel.IsLoading = Visibility.Collapsed;
                            //    return;
                            //}
                            result1 = savedoc.WriteToFilePath(path);
                            if (!result1)
                            {
                                viewModel.ShowToast();
                            }
                            savedoc.Release();//释放内存
                        }

                        #region 多选页面 分别生成单独文件

                        //List<int> pagenums = new List<int>();
                        //for (int i = 0; i < viewModel.PageEditItems.Count; i++)
                        //{
                        //    if (viewModel.PageEditItems[i].Selected)
                        //    {
                        //        pagenums.Add(viewModel.PageEditItems[i].PageNumber);
                        //    }
                        //}
                        //string[] files = new string[pagenums.Count];
                        //for (int i = 0; i < pagenums.Count; i++)
                        //{
                        //    string filename = viewModel.PDFViewer.Document.FileName + " " + pagenums[i] + ".pdf";
                        //    string tempPath = System.IO.Path.Combine(dir, filename);
                        //    string path = CommonHelper.CreateFilePath(tempPath);
                        //    files[i] = path;
                        //    dropMoveFiles.Add(path);

                        //    CPDFDocument savedoc = CPDFDocument.CreateDocument();
                        //    bool result2 = savedoc.ImportPages(viewModel.PDFViewer.Document, pagenums[i].ToString());
                        //    if (!result2)
                        //    {
                        //        savedoc.Release();
                        //        continue;
                        //    }
                        //    result2 = savedoc.WriteToFilePath(path);
                        //    if (!result2)
                        //    {
                        //        savedoc.Release();
                        //        continue;
                        //    }
                        //    savedoc.Release();//释放内存
                        //}

                        #endregion 多选页面 分别生成单独文件

                        //string[] files = new string[1];
                        //files[0] = tempPath;

                        DataObject dataObj = new DataObject(DataFormats.FileDrop, files);

                        #endregion 拖拽 页面 到 桌面/文件夹 ，提取文件

                        //禁用从窗体拖拽到桌面的方法
                        //DataObject dataObj = new DataObject(listBoxItem);
                        //注意！！！目前是通过DragDropEffects类型来区分app内拖拽和外部文件拖入。否则页面文件拖拽页面到PDFViewer，也会新生成一个页签
                        //如果这里的DragDropEfeects类型有改动，也需要调整ViewContent里UserControl_Drop函数的判断逻辑
                        DragDrop.DoDragDrop(ListPageEdit, dataObj, DragDropEffects.Copy);
                        Mouse.Capture(ListPageEdit);
                        //CleanDropMoveFiles();
                        return;
                    }
                }
                RectChoose.Visibility = Visibility.Collapsed;
                startChoose = false;
                LineInset.Visibility = Visibility.Collapsed;
                ImgPicture.Visibility = Visibility.Collapsed;
                Mouse.Capture(null);
            }
            catch
            {
                LineInset.Visibility = Visibility.Collapsed;
                ImgPicture.Visibility = Visibility.Collapsed;
            }
        }

        private List<int> GetSelectedItems()
        {
            List<int> pages = new List<int>();
            for (int i = 0; i < ListPageEdit.SelectedItems.Count; i++)
            {
                //这样拿 更精准
                if (ListPageEdit.SelectedItems[i] is PageEditItem pageEditItem)
                {
                    pages.Add(pageEditItem.PageNumber);
                }
            }
            return pages;
        }

        /// <summary>
        /// 判断是否开始框选、记录框选起始位置
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ListPageEdit_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            var pos = e.GetPosition(ListPageEdit);
            HitTestResult result = VisualTreeHelper.HitTest(ListPageEdit, pos);
            if (result == null)
            {
                return;
            }
            //未选中item  并且不是点击滑轨时 开始框选
            var listBoxItem = CommonHelper.FindVisualParent<ListBoxItem>(result.VisualHit);
            var scroller = CommonHelper.FindVisualParent<ScrollBar>(result.VisualHit);
            if (listBoxItem == null)
            {
                if (scroller != null)
                {
                    startChoose = false;
                    return;
                }
                //点击空白处时开始框选
                startChoose = true;
                if (ListPageEdit.SelectedItems.Count > 0)
                {
                    ListPageEdit.SelectedItems.Clear();
                }
                starPosition = e.GetPosition(ListPageEdit);
                starPosition = new Point(starPosition.X, starPosition.Y + GetWrapPanel(ListPageEdit).VerticalOffset);
                Mouse.Capture(ListPageEdit);
                return;
            }
            //选中了item 时，不能框选
            startChoose = false;
            isDragingEnter = false;

            //更改系统的选中规则，选中状态下，鼠标松开后取消选中
            //方便实现多选拖拽功能
            if (listBoxItem.IsSelected == true && !Keyboard.IsKeyDown(Key.LeftCtrl))
            {
                e.Handled = true;
            }
        }

        private void ListPageEdit_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            var pos = e.GetPosition(ListPageEdit);
            HitTestResult result = VisualTreeHelper.HitTest(ListPageEdit, pos);
            if (result == null)
            {
                return;
            }

            var listBoxItem = CommonHelper.FindVisualParent<ListBoxItem>(result.VisualHit);
            if (listBoxItem == null)
            {
                return;
            }

            //更改系统默认的选中规则，多选后，鼠标单击抬起后再选中单个
            //拖拽框选之后的抬起鼠标不进入处理
            if (!startChoose && !Keyboard.IsKeyDown(Key.LeftCtrl) && !Keyboard.IsKeyDown(Key.LeftShift))
            {
                ListPageEdit.SelectedItems.Clear();
                ListPageEdit.SelectedItem = listBoxItem;
                listBoxItem.IsSelected = true;
                return;
            }

            Mouse.Capture(null);
            //结束鼠标框选
            startChoose = false;
            RectChoose.Visibility = Visibility.Collapsed;
        }

        /// <summary>
        /// 获取Listobox的Wrappanel容器
        /// </summary>
        /// <param name="listBox"></param>
        /// <returns></returns>
        public VirtualizingWrapPanel GetWrapPanel(ListBox listBox)
        {
            Border border = VisualTreeHelper.GetChild(listBox, 0) as Border;
            var panel = CommonHelper.FindVisualChild<VirtualizingWrapPanel>(border);
            return panel;
        }

        /// <summary>
        ///根据鼠标拖选的框 选中矩形框里面的Item
        /// </summary>
        private void DoSelectItems()
        {
            var s = GetScrollHost(ListPageEdit);
            Point start = new Point();
            //通过 实时的垂直偏移量和第一次的偏移量抵消，来获取准确的垂直偏移值。
            start = new Point(starPosition.X, starPosition.Y - s.VerticalOffset);
            var rec = new Rect(start, Mouse.GetPosition(ListPageEdit));
            RectChoose.Margin = new Thickness(rec.Left, rec.Top, 0, 0);
            RectChoose.Width = rec.Width;
            RectChoose.Height = rec.Height;
            RectChoose.Visibility = Visibility.Visible;

            //检测遍历所有项,筛选在矩形框中的Item
            for (int i = 0; i < ListPageEdit.Items.Count; i++)
            {
                var _item = ListPageEdit.ItemContainerGenerator.ContainerFromIndex(i) as ListBoxItem;
                //通过这一步来避免重复误选中
                var parent = CommonHelper.FindVisualParent<VirtualizingWrapPanel>(_item);
                if (parent == null)
                    continue;

                var v = VisualTreeHelper.GetOffset(_item);
                if (rec.IntersectsWith(new Rect(v.X, v.Y, _item.ActualWidth, _item.ActualHeight)))
                {
                    ListPageEdit.SelectedItems.Add(ListPageEdit.Items[i]);
                }
                else
                {
                    ListPageEdit.SelectedItems.Remove(ListPageEdit.Items[i]);
                }
            }
            return;
        }

        /// <summary>
        /// 退出拖拽模式
        /// </summary>
        private void ExitDraging()
        {
            LineInset.Visibility = Visibility.Collapsed;
            ImgPicture.Visibility = Visibility.Collapsed;
            isDraging = false;
        }

        /// <summary>
        /// 拖拽释放后的处理逻辑
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void ListPageEdit_Drop(object sender, DragEventArgs e)
        {
            //isDragingEnter = false;
            needScroll = false;
            if (!isDraging)
            {
                //未拖拽时隐藏插入标记和虚影
                LineInset.Visibility = Visibility.Collapsed;
                ImgPicture.Visibility = Visibility.Collapsed;
                return;
            }

            //拖入非法格式释放时 返回
            string[] file = (string[])e.Data.GetData(DataFormats.FileDrop);
            if (file != null)
            {
                #region 从外部拖拽插入文件

                if (isDragingEnter)
                {
                    //不能将付费锁 放到 grid_DragOver，会卡顿
                    //将付费锁逻辑提前，避免因弹窗显示后导致虚影无法消失问题
                    if (!ServiceHelper.IAPBeforeFunction())
                    {
                        LineInset.Visibility = Visibility.Collapsed;
                        ImgPicture.Visibility = Visibility.Collapsed;
                        isDragingEnter = false;
                        return;
                    }
                    //注释从外部拖拽插入文件的功能
                    var files = (string[])e.Data.GetData(DataFormats.FileDrop);
                    Array.Reverse(files);
                    foreach (string item in files)
                    {
                        System.IO.FileInfo info = new System.IO.FileInfo(item);
                        string fileName = viewModel.GetInsertFromFile(item);
                        //if (System.IO.Path.GetExtension(item).ToLower() == ".pdf" && info.Length > 0)
                        //{
                        //    int index = InsertIndex == -1 ? 0 : InsertIndex;
                        //    await viewModel.InsertFromFile(index, item);
                        //    viewModel.ReloadAfterOption(true, true, new Tuple<int, int>(0, ListPageEdit.Items.Count));
                        //}
                        if (info.Length > 0 && File.Exists(fileName))
                        {
                            int index = InsertIndex == -1 ? 0 : InsertIndex;
                            await viewModel.InsertFromFile(index, fileName);
                            viewModel.ReloadAfterOption(true, true, new Tuple<int, int>(0, ListPageEdit.Items.Count));
                        }
                    }
                    //其他文件  则新增一个页签打开
                    //    DragAddTab.Invoke(dragingEnterPath, new RoutedEventArgs());//底层库需要加一个  Load(TPDFDocument)的接口
                    LineInset.Visibility = Visibility.Collapsed;
                    ImgPicture.Visibility = Visibility.Collapsed;
                    isDragingEnter = false;
                    return;
                }

                #endregion 从外部拖拽插入文件

                //return;
            }

            var pos = e.GetPosition(ListPageEdit);
            var result = VisualTreeHelper.HitTest(ListPageEdit, pos);
            if (result == null)
            {
                //超出当前可控区域
                ExitDraging();
                return;
            }
            //查找元数据
            //var sourcePerson = e.Data.GetData(typeof(StackPanel)) as StackPanel;
            if (tempItem == null)
            {
                ExitDraging();
                return;
            }
            //查找目标数据
            int targetindex = 0;//目标插入位置
            if (InsertIndex != -1)
            {
                //往前移动时  此index  不是准确的，需要处理++
                targetindex = InsertIndex;
            }
            //else//基本不会命中  仅作为保险措施
            //{
            //    var listBoxItem = CommonHelper.FindVisualParent<ListBoxItem>(result.VisualHit);
            //    if (listBoxItem == null)
            //    {
            //        ////鼠标停留在两个item之间或其他无效区域  暂时不做处理(比较麻烦)
            //        ExitDraging();
            //        return;
            //    }
            //    var targetPerson = listBoxItem;
            //    targetPerson.Opacity = 1;
            //    sourcePerson.Opacity = 1;
            //    if (ReferenceEquals(targetPerson, sourcePerson))
            //    {
            //        ExitDraging();
            //        return;
            //    }

            //    targetindex = ListPageEdit.Items.IndexOf(targetPerson);
            //}

            List<ListBoxItem> list = new List<ListBoxItem>();
            List<int> sourceindex = new List<int>();//需要保存每个页面对应的位置
                                                    //开始排序
            List<int> pages = new List<int>();
            //要先对所有选中项 根据页码排序
            for (int i = 0; i < ListPageEdit.SelectedItems.Count; i++)
            {
                var pageindex = ListPageEdit.Items.IndexOf(ListPageEdit.SelectedItems[i] as PageEditItem);
                pages.Add(pageindex);//存入的为页码索引值
            }
            if (pages.Count <= 0)
            {
                ExitDraging();
                return;
            }

            viewModel.DragToSort(targetindex, pages);
            ExitDraging();
            isDraging = false;

            CleanDropMoveFiles();
        }

        /// <summary>
        /// 拖拽完成后，清空临时目录 的文件
        /// </summary>
        private void CleanDropMoveFiles()
        {
            if (dropMoveFiles != null)
            {
                if (dropMoveFiles.Count > 0)
                {
                    for (int i = 0; i < dropMoveFiles.Count; i++)
                    {
                        if (File.Exists(dropMoveFiles[i]))
                        {
                            File.Delete(dropMoveFiles[i]);
                        }
                    }
                    dropMoveFiles.Clear();
                }
            }
        }

        private void MidLane_Drop(object sender, DragEventArgs e)
        {
            ListPageEdit_Drop(sender, e);
        }

        private void ImgPicture_Drop(object sender, DragEventArgs e)
        {
            ListPageEdit_Drop(sender, e);
        }

        /// <summary>
        /// 拖拽事件写在外部的Grid里，会更加流畅
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Grid_DragOver(object sender, DragEventArgs e)
        {
            try
            {
                Trace.WriteLine("Grid_DragOver 文件拖出App");

                //ctrl建按下 不显示插入标记和虚影  因为释放不会响应drop事件
                if (e.KeyStates == (DragDropKeyStates.ControlKey | DragDropKeyStates.LeftMouseButton) || e.KeyStates == (DragDropKeyStates.ShiftKey | DragDropKeyStates.LeftMouseButton | DragDropKeyStates.ControlKey))
                    return;

                //从外部拖入文件时 返回
                string[] file = (string[])e.Data.GetData(DataFormats.FileDrop);
                if (file != null)
                {
                }

                //滚动后有 位置不准确 要减去滚动偏移量
                //控制线的位置
                var pos = e.GetPosition(ListPageEdit);
                var result = VisualTreeHelper.HitTest(ListPageEdit, pos);
                if (result == null)
                {
                    return;
                    //MidLane.Visibility = Visibility.Collapsed;
                    //return;
                }

                //获取当前鼠标指针下的容器
                var listBoxItem = CommonHelper.FindVisualParent<ListBoxItem>(result.VisualHit);
                if (listBoxItem == null)
                {
                    //页面 拖出App后隐藏 标记线、缩略图
                    LineInset.Visibility = Visibility.Collapsed;
                    ImgPicture.Visibility = Visibility.Collapsed;
                    //MidLane.Visibility = Visibility.Collapsed;
                    //return;
                }

                #region 计算虚影位置

                //xaml层 要设置 虚影控件为左上
                double xPos = 0;
                double yPos = 0;
                //内部拖动
                if (!isDragingEnter)
                {
                    if (tempItem != null)
                    {
                        ImgPicture.Width = tempItem.ItemSize.Width;
                        ImgPicture.Height = tempItem.ItemSize.Height;
                        ImgPicture.Source = tempItem.Image;
                        xPos = e.GetPosition(ListPageEdit).X - item_x;
                        yPos = e.GetPosition(ListPageEdit).Y - item_y;
                    }
                }
                else
                {
                    DragDropHelper.DragOver(this, e);
                    //从外部拖入的逻辑
                    //var pic = ToBitmapSource(dragingEnterPath);
                    //ShadowPicture.Width = pic.Width;
                    //ShadowPicture.Height = pic.Height;
                    //ShadowPicture.Source = pic;
                    //xPos = e.GetPosition(ListPageEdit).X - pic.Width / 2;
                    //yPos = e.GetPosition(ListPageEdit).Y - pic.Height / 2;
                }

                ImgPicture.Margin = new Thickness(xPos, yPos, 0, 0);

                #endregion 计算虚影位置

                #region 计算插入标记位置

                var scroll = GetScrollHost(ListPageEdit);
                if (listBoxItem != null)
                {
                    //虚拟化影响到该值计算
                    var p = VisualTreeHelper.GetOffset(listBoxItem);//计算控件在容器中的偏移(位置)
                    LineInset.Visibility = Visibility.Visible;
                    if (!isDragingEnter)
                    {
                        ImgPicture.Visibility = Visibility.Visible;
                    }
                    else
                    {
                        ImgPicture.Visibility = Visibility.Collapsed;
                    }

                    var panel = GetWrapPanel(ListPageEdit);

                    //var item = panel.ItemSize.Width;
                    //var item = (ListPageEdit.ItemContainerGenerator.ContainerFromIndex(0) as ListBoxItem).DesiredSize.Width;
                    var item = listBoxItem.DesiredSize.Width;

                    int count = (int)(panel.ViewportWidth / item);
                    var gap = (panel.ViewportWidth - count * item) / (count + 1) * 1.0;

                    LineInset.X2 = LineInset.X1 = p.X + gap / 2 + listBoxItem.DesiredSize.Width;

                    if (pos.X < p.X + gap / 2 + listBoxItem.ActualWidth / 2)
                    {
                        LineInset.X2 = LineInset.X1 = p.X - gap / 2;
                        InsertIndex = ListPageEdit.Items.IndexOf(listBoxItem.DataContext as PageEditItem);
                    }
                    else
                    {
                        InsertIndex = ListPageEdit.Items.IndexOf(listBoxItem.DataContext as PageEditItem) + 1;
                    }
                    Console.WriteLine("InsertIndex:{0}\r\n", InsertIndex);
                    //MidLane.Y1 = p.Y - scroll.VerticalOffset;//向下滑动后要减去滑动值
                    LineInset.Y1 = p.Y;
                    if (LineInset.Y1 < 0)//避免超出上边界
                    {
                        LineInset.Y1 = 0;
                    }
                    //MidLane.Y2 = p.Y + listBoxItem.ActualHeight - scroll.VerticalOffset;//仿智能滚动后可能会导致 垂直滚动偏量不准确
                    LineInset.Y2 = p.Y + listBoxItem.ActualHeight;
                    if (LineInset.Y2 < 0)
                    {
                        LineInset.Y2 = 0;
                    }
                }

                #endregion 计算插入标记位置

                //暂时处理  鼠标移出边框时，虚影的显示问题
                //230612 拖拽逻辑，为了更好的效果体现，暂时注释
                if (pos.Y <= 30 || pos.Y >= ListPageEdit.ActualHeight - 10)
                {
                    LineInset.Visibility = Visibility.Collapsed;
                    ImgPicture.Visibility = Visibility.Collapsed;
                    needScroll = false;
                }

                if (pos.X <= 40 || pos.X >= scroll.ViewportWidth - 50)
                {
                    LineInset.Visibility = Visibility.Collapsed;
                    ImgPicture.Visibility = Visibility.Collapsed;
                    needScroll = false;
                }

                #region 靠近上下边界时，自动滚动，离边界越近，滚动速度越快

                speed = 0;
                if (pos.Y >= ListPageEdit.ActualHeight - 30)
                {
                    speed = 30 - (int)(ListPageEdit.ActualHeight - pos.Y);
                    needScroll = true;
                }
                else if (pos.Y <= 30)
                {
                    speed = (int)(pos.Y - 30);
                    needScroll = true;
                }
                else
                    needScroll = false;

                var v = scroll.VerticalOffset;
                scroll.ScrollToVerticalOffset(v + speed);//触发连续滚动

                #endregion 靠近上下边界时，自动滚动，离边界越近，滚动速度越快
            }
            catch
            {
            }
        }

        private void ListBoxItem_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            //增加辅助判断，防止误触发 拖动排序
            //为了排除 页面 拖出App后，点击选择页面，造成拖动
            isDraging = false;
            if (GridBOTAHeader.Visibility == Visibility.Visible && viewModel.PDFViewer != null)
            {
                if (Keyboard.Modifiers == ModifierKeys.Shift || Keyboard.Modifiers == ModifierKeys.Control)
                {
                    return;
                }
                var item = (sender as ListBoxItem).DataContext as PageEditItem;
                if (item != null)
                {
                    viewModel.PDFViewer.GoToPage(item.PageNumber - 1);
                }
            }
        }

        private void ListBoxItem_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            if (e.ChangedButton == MouseButton.Left)
            {
                //双击回到PDFViewer界面
                var item = sender as ListBoxItem;
                if (item != null)
                {
                    var index = ListPageEdit.ItemContainerGenerator.IndexFromContainer(item);
                    //双击事件无法绑定Command 暂时采用这种方式调用VM里的方法
                    viewModel.BackToPDFViewer(index);
                }
            }
        }

        private void PageEdit_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            //BOTA缩略图模式下需要调整Item宽度
            if (GridBOTAHeader.Visibility == Visibility.Visible)
            {
                ItemSuitAcutalWidth(e.NewSize.Width);
            }

            if (e.NewSize.Width > 0)
            {
                //宽度变化后刷新一次视图 修复重复点击缩略图后图片不显示的问题
                PulishEvent();
            }
        }

        private void ItemSuitAcutalWidth(double width)
        {
            //缩略图模式下，保持一列或者两列显示
            if ((bool)TbnTwoLine.IsChecked)
            {
                var itemwidth = (width - 140) / 2;
                if (itemwidth < 0)
                {
                    itemwidth = width / 4;
                }
                var itemHeight = 294 * itemwidth / 208.0;
                viewModel.ChangeItemSize(new Size(itemwidth, itemHeight));
            }
            else
            {
                var itemwidth = 0.6 * width;
                var itemheight = 294 * itemwidth / 208.0;
                viewModel.ChangeItemSize(new Size(itemwidth, itemheight));
            }
        }

        private void TbnTwoLine_Click(object sender, RoutedEventArgs e)
        {
            ItemSuitAcutalWidth(this.ActualWidth);
            PulishEvent();
        }

        /// <summary>
        /// 用来判断是否有外界拖入的事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Grid_PreviewDragEnter(object sender, DragEventArgs e)
        {
            Trace.WriteLine("Grid_PreviewDragEnter 文件拖出App");
            var files = (System.Array)e.Data.GetData(DataFormats.FileDrop);
            if (files == null)//为null 表示内部拖动 触发的
            {
                return;
            }
            else
            {
                string temp = System.IO.Path.Combine(System.IO.Path.GetTempPath());
                isDragingEnter = false;

                foreach (string file in files)
                {
                    if (File.Exists(file))
                    {
                        string dic = System.IO.Path.GetDirectoryName(file) + "\\";
                        //在 App内拖拽，或将 页面 拖出App
                        if (string.Compare(dic, temp, StringComparison.OrdinalIgnoreCase) == 0)
                        {
                            isDragingEnter = false;
                        }
                        //从外部 拖文件 进App
                        else
                        {
                            System.IO.FileInfo info = new System.IO.FileInfo(file);
                            // 文件里包含有pdf格式文件，就允许拖入
                            string type = System.IO.Path.GetExtension(file).ToLower();
                            if (viewModel.Txt.Contains(type) ||
                            viewModel.Word.Contains(type) ||
                            viewModel.Ppt.Contains(type) ||
                            viewModel.Excel.Contains(type) ||
                            viewModel.Html.Contains(type) ||
                            viewModel.Image.Contains(type) ||
                              viewModel.Pdf.Contains(type) && info.Length > 0)
                            {
                                isDragingEnter = true;
                            }
                            //if (System.IO.Path.GetExtension(file).ToLower() == ".pdf" && info.Length > 0)
                            //{
                            //    isDragingEnter = true;
                            //}
                        }
                        ////文件拖出app 最后在这里 结束
                        //if (isExtractEnter)
                        //{
                        //    isExtractEnter = false;
                        //    return;
                        //}
                        //else
                        //{
                        //    System.IO.FileInfo info = new System.IO.FileInfo(file);
                        //    //只要拖拽进来的文件里包含有pdf格式文件，就允许拖入
                        //    if (System.IO.Path.GetExtension(file).ToLower() == ".pdf" && info.Length > 0)
                        //    {
                        //        isDragingEnter = true;
                        //        isExtractEnter = false;
                        //    }
                        //}
                    }
                }

                DragDropHelper.DragEnter(this, e);
            }
        }

        private void Grid_DragLeave(object sender, DragEventArgs e)
        {
            DragDropHelper.DragLeave();
        }

        private void Grid_Drop(object sender, DragEventArgs e)
        {
            DragDropHelper.Drop(this, e);
        }

        private void ListBoxItem_DragLeave(object sender, DragEventArgs e)
        {
            //增加辅助判断，防止误触发 拖动排序
            //较大幅度拖动才能触发排序
            isDraging = true;
        }

        private void Border_Drop(object sender, DragEventArgs e)
        {
        }

        private async void TextBoxEx_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            var text = sender as TextBox;
            if (text != null)
            {
                await Task.Delay(50);
                text.Focus();
            }
        }

        private void TextBoxEx_TextChanged(object sender, TextChangedEventArgs e)
        {
            var text = sender as TextBox;
            if (text.Visibility == Visibility.Visible && string.IsNullOrEmpty(text.Text))
            {
                text.Focus();
            }
        }

        private void TextBoxEx_LostFocus(object sender, RoutedEventArgs e)
        {
            //因为需要处理点击按钮或者点击列表失去焦点是 不进行弹窗 因此写在cs里，方便获取UI控件
            var element = FocusManager.GetFocusedElement(this);
            var visual = VisualTreeHelper.HitTest(this, Mouse.GetPosition(this));
            //点击其他区域失去焦点时 不响应页码判断逻辑
            if (visual != null)
            {
                var listbox = CommonHelper.FindVisualParent<ListBox>(visual.VisualHit);
                if (listbox != null)
                {
                    //点击在listbox列表内
                    return;
                }
                var image = CommonHelper.FindVisualParent<Image>(visual.VisualHit);
                if (image != null)
                {
                    //点击在listbox列表内,具体某一项时，上面的判断调整可能失效，需要补充条件
                    return;
                }
                var button = CommonHelper.FindVisualParent<Button>(visual.VisualHit);
                if (button != null)
                {
                    //点击在按钮时
                    return;
                }
                var combox = CommonHelper.FindVisualParent<ComboBox>(visual.VisualHit);
                if (combox != null)
                {
                    //点击在下拉框时
                    return;
                }
                viewModel.lostfocus(e);
            }
        }

        private void Grid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            var visual = VisualTreeHelper.HitTest(GridHeader, Mouse.GetPosition(GridHeader));
            if (visual == null)
            {
                //点击区域不是二级菜单区域的Grid时，返回
                return;
            }
            var menuItem = CommonHelper.FindVisualParent<ComboBoxItem>(visual.VisualHit);
            if (menuItem != null)
            {
                //点击位置为下拉菜单子项时，返回
                return;
            }
            if (visual != null && (visual.VisualHit as Grid) != null)
            {
                //点击工具栏空白处时 失去焦点
                ListPageEdit.Focus();
            }
        }

        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            //因为需要获取准确的选中页面，因此把入口放在.cs代码里
            List<int> lists = new List<int>();
            foreach (PageEditItem item in ListPageEdit.SelectedItems)
            {
                lists.Add(item.PageNumber);
            }
            viewModel.print(lists);
        }

        private void PageEdit_Unloaded(object sender, RoutedEventArgs e)
        {
            //释放定时器 避免内存泄露
            timer?.Stop();
            if (timer != null)
            {
                timer.Tick -= Timer_Tick;
                timer = null;
            }
        }

        private void PageEdit_Loaded(object sender, RoutedEventArgs e)
        {
            if (timer == null)
            {
                timer = new DispatcherTimer();
                timer.Tick += Timer_Tick;
            }
        }

        private void CmbPageRange_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            Regex regex = new Regex("[^0-9,-]+"); // 限制仅允许数字、逗号和横杠
            e.Handled = regex.IsMatch(e.Text);
        }

        private void BtnInsert_Initialized(object sender, EventArgs e)
        {
            this.BtnInsert.ContextMenu = null;
        }

        private void BtnInsert_Click(object sender, RoutedEventArgs e)
        {
            MenuInsert.PlacementTarget = this.BtnInsert;
            MenuInsert.IsOpen = true;
        }

        private void ContextMenu_Loaded(object sender, RoutedEventArgs e)
        {
            var menu = sender as System.Windows.Controls.ContextMenu;
            if (menu != null)
            {
                List<int> pages = GetSelectedItems();
                if (pages.Count >= 2)
                {
                    foreach (var item in menu.Items)
                    {
                        if (item is MenuItem menuItem)
                        {
                            if (menuItem.Tag == null)
                            {
                                continue;
                            }
                            //右键菜单 先按照230616的原型，后续原型改动在调整
                            if (viewModel.IsBOTAThumb == Visibility.Visible)
                            {
                                if (menuItem.Tag.ToString() == "Insert")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Reverse")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Split")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Extract")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Replace")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                            }
                            else
                            {
                                if (menuItem.Tag.ToString() == "Insert")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Reverse")
                                {
                                    menuItem.Visibility = Visibility.Visible;
                                }
                                if (menuItem.Tag.ToString() == "Split")
                                {
                                    menuItem.Visibility = Visibility.Visible;
                                }
                            }
                        }
                    }
                }
                else
                {
                    foreach (var item in menu.Items)
                    {
                        if (item is MenuItem menuItem)
                        {
                            if (menuItem.Tag == null)
                            {
                                continue;
                            }
                            if (viewModel.IsBOTAThumb == Visibility.Visible)
                            {
                                if (menuItem.Tag.ToString() == "Insert")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Reverse")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Split")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Extract")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Replace")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                            }
                            else
                            {
                                if (menuItem.Tag.ToString() == "Insert")
                                {
                                    menuItem.Visibility = Visibility.Visible;
                                }
                                if (menuItem.Tag.ToString() == "Reverse")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                                if (menuItem.Tag.ToString() == "Split")
                                {
                                    menuItem.Visibility = Visibility.Collapsed;
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}