PDFOffice_Windows_exe/PDF Office/ViewModels/BOTA/SearchContentViewModel.cs

using ComPDFKit.PDFPage;
using ComPDFKitViewer.AnnotEvent;
using ComPDFKitViewer.PdfViewer;
using PDF_Office.Model;
using PDF_Office.Model.BOTA;
using PDF_Office.Properties;
using PDF_Office.Views.BOTA;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Threading;

namespace PDF_Office.ViewModels.BOTA
{

    class SearchContentViewModel : BindableBase, INavigationAware
    {

        #region 属性

        private Visibility completed;

        public Visibility Completed
        {
            get { return completed; }
            set
            {
                SetProperty(ref completed, value);
            }
        }

        private string searchCount;

        public string SearchCount
        {
            get { return searchCount; }
            set
            {
                SetProperty(ref searchCount, value);
            }
        }


        private ObservableCollection<SearchItem> searchItemList;

        public ObservableCollection<SearchItem> SearchItemList
        {
            get { return searchItemList; }
            set
            {
                SetProperty(ref searchItemList, value);
            }
        }

        private PDFTextSearch textSearch;

        private CPDFViewer PDFViewer;
        private ViewContentViewModel viewContentViewModel;

        private string CurrentSearchText = "";

        private ObservableCollection<string> myVar;

        public ObservableCollection<string> MyProperty
        {
            get { return myVar; }
            set
            {
                SetProperty(ref myVar, value);
            }
        }

        private bool caseInsensitive = true;

        public bool CaseInsensitive
        {
            get { return caseInsensitive; }
            set
            {
                SetProperty(ref caseInsensitive, value);
            }
        }

        public DelegateCommand<object> SearchChangedCommand { get; set; }
        public DelegateCommand CleanCommand { get; set; }

        #endregion


        public SearchContentViewModel()
        {
            textSearch = new PDFTextSearch();
            SearchItemList = new ObservableCollection<SearchItem>();
            MyProperty = new ObservableCollection<string>() { "1", "2" };
            SearchChangedCommand = new DelegateCommand<object>(SearchChanged);
            CleanCommand = new DelegateCommand(clean);


            ICollectionView groupView = CollectionViewSource.GetDefaultView(SearchItemList);
            groupView.GroupDescriptions.Add(new PropertyGroupDescription(nameof(SearchItem.ShowPageIndex)));

            textSearch.SearchPercentHandler += TextSearch_SearchPercentHandler;
            textSearch.SearchCompletedHandler += TextSearch_SearchCompletedHandler;
            Completed = Visibility.Collapsed;
        }

        private void TextSearch_SearchCompletedHandler(object sender, TextSearchResult e)
        {
            App.Current.Dispatcher.Invoke(() =>
            {
                Completed = Visibility.Visible;
                SearchCount = e.TotalCount.ToString();
            });
        }

        private void TextSearch_SearchPercentHandler(object sender, TextSearchResult e)
        {
            App.Current.Dispatcher.Invoke(() =>
            {
                if (e.Items.ContainsKey(e.CurrentPage))
                {
                    foreach (TextSearchItem item in e.Items[e.CurrentPage])
                    {
                        SearchItem addItem = new SearchItem();
                        addItem.TextProperty = new TextBindProperty();
                        addItem.TextProperty.PageIndex = item.PageIndex;
                        addItem.TextProperty.TextContent = item.TextContent;
                        addItem.TextProperty.TextRect = item.TextRect;
                        addItem.TextProperty.SearchWord = CurrentSearchText;
                        addItem.TextProperty.HighLightColor = Color.FromArgb(0x99, 0xFF, 0xF7, 0x00);
                        addItem.TextProperty.PageRotate = item.PageRotate;
                        SearchItemList.Add(addItem);
                    }
                }
                SearchCount = e.TotalCount.ToString();
            });
        }

        /// <summary>
        /// 文字搜索
        /// </summary>
        public async void SearchText(string Text)
        {
            //防止正在进行搜索，先取消一次。(若没有搜索，该方法不进行操作)
            textSearch.CancleSearch();
            //为了防止死循环，当超过十次，即0.1秒还是不能进行搜索，则取消本次搜索
            int counter = 0;
            while (!textSearch.CanDoSearch)
            {
                await Task.Delay(10);
                if (counter > 10)
                {
                    return;
                }
            }
            //成功取消后，清除之前的结果，并搜索新内容
            SearchItemList.Clear();
            Completed = Visibility.Collapsed;

            if (CaseInsensitive)
            {
                textSearch.SearchText(Text, C_Search_Options.Search_Case_Insensitive);
            }
            else
            {
                textSearch.SearchText(Text, C_Search_Options.Search_Case_Sensitive);
            }
            CurrentSearchText = Text;
        }

        /// <summary>
        /// 根据UI的Tag与绑定的对象来创建注释的方法
        /// </summary>
        public void CreateAnnotate(object item, string Tag)
        {
            SearchItem searchItem = item as SearchItem;
            if (searchItem == null)
            {
                return;
            }
            switch (Tag)
            {
                case "Round":
                    CircleAnnotArgs circleannotArgs = new CircleAnnotArgs();
                    circleannotArgs.ClientRect = Helper.DpiHelpers.GetRawRelatedRect(searchItem.TextProperty.TextRect);
                    circleannotArgs.Transparency = 1;
                    circleannotArgs.BgColor = Colors.Transparent;
                    circleannotArgs.LineColor = Colors.Red;
                    circleannotArgs.LineWidth = 2;
                    PDFViewer.CreatePageAnnot(searchItem.TextProperty.PageIndex, circleannotArgs);
                    break;
                case "Rectangle":
                    SquareAnnotArgs squareAnnotArgs = new SquareAnnotArgs();
                    squareAnnotArgs.ClientRect = Helper.DpiHelpers.GetRawRelatedRect(searchItem.TextProperty.TextRect);
                    squareAnnotArgs.Transparency = 1;
                    squareAnnotArgs.BgColor = Colors.Transparent;
                    squareAnnotArgs.LineColor = Colors.Red;
                    squareAnnotArgs.LineWidth = 2;
                    PDFViewer.CreatePageAnnot(searchItem.TextProperty.PageIndex, squareAnnotArgs);
                    break;
                case "Highlight":
                    TextHighlightAnnotArgs highlightAnnotArgs = new TextHighlightAnnotArgs();
                    highlightAnnotArgs.Color = Settings.Default.AppProperties.Annotate.HighLightColor;
                    highlightAnnotArgs.Transparency = 1;
                    highlightAnnotArgs.PagesHiglightRectList[searchItem.TextProperty.PageIndex] = new List<Rect>();
                    highlightAnnotArgs.PagesHiglightRectList[searchItem.TextProperty.PageIndex].Add(searchItem.TextProperty.TextRect);
                    PDFViewer.CreatePageAnnot(searchItem.TextProperty.PageIndex, highlightAnnotArgs);
                    break;
                case "Underline":
                    TextUnderlineAnnotArgs underlineAnnotArgs = new TextUnderlineAnnotArgs();
                    underlineAnnotArgs.Color = Settings.Default.AppProperties.Annotate.UnderLineColor;
                    underlineAnnotArgs.Transparency = 1;
                    underlineAnnotArgs.PagesUnderlineRectList[searchItem.TextProperty.PageIndex] = new List<Rect>();
                    underlineAnnotArgs.PagesUnderlineRectList[searchItem.TextProperty.PageIndex].Add(searchItem.TextProperty.TextRect);
                    PDFViewer.CreatePageAnnot(searchItem.TextProperty.PageIndex, underlineAnnotArgs);
                    break;
                case "Strikethrough":
                    TextStrikeoutAnnotArgs strikeoutAnnotArgs = new TextStrikeoutAnnotArgs();
                    strikeoutAnnotArgs.Color = Settings.Default.AppProperties.Annotate.StrikethroughColor;
                    strikeoutAnnotArgs.Transparency = 1;
                    strikeoutAnnotArgs.PagesStrikeoutRectList[searchItem.TextProperty.PageIndex] = new List<Rect>();
                    strikeoutAnnotArgs.PagesStrikeoutRectList[searchItem.TextProperty.PageIndex].Add(searchItem.TextProperty.TextRect);
                    PDFViewer.CreatePageAnnot(searchItem.TextProperty.PageIndex, strikeoutAnnotArgs);
                    break;
                default:
                    break;
            }
        }

        /// <summary>
        /// 选项改变时，跳转并且高亮搜索内容
        /// </summary>
        private void SearchChanged(object obj)
        {

            if (PDFViewer != null && textSearch != null)
            {
                SearchItem currentItem = obj as SearchItem;
                if (currentItem != null && PDFViewer != null)
                {
                    List<TextSearchItem> pageTextList = new List<TextSearchItem>();
                    pageTextList.Add(new TextSearchItem()
                    {
                        PageIndex = currentItem.TextProperty.PageIndex,
                        TextRect = currentItem.TextProperty.TextRect,
                        TextContent = currentItem.TextProperty.TextContent,
                        PageRotate = currentItem.TextProperty.PageRotate
                    });
                    PDFViewer.SetPageSelectText(pageTextList, new SolidColorBrush(Color.FromArgb(0x99, 0xFF, 0xF7, 0x00)));
                }
            }
        }

        private void clean()
        {
            SearchItemList.Clear();
            viewContentViewModel.OpenBOTA = false;
        }

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

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
            return;
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            navigationContext.Parameters.TryGetValue<CPDFViewer>(ParameterNames.PDFViewer, out PDFViewer);
            if (PDFViewer != null)
            {
                textSearch.TextSearchDocument = PDFViewer.Document;
            }
            navigationContext.Parameters.TryGetValue<ViewContentViewModel>(ParameterNames.ViewContentViewModel, out viewContentViewModel);
        }
    }
}