kmpdfkit_demo/Demo/Examples/Compdfkit_Tools/PDFView/PDFSearch/PDFSearchControl/CPDFSearchControl.xaml.cs

using ComPDFKit.PDFPage;
using Compdfkit_Tools.PDFControlUI;
using ComPDFKitViewer.PdfViewer;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using Compdfkit_Tools.Helper;

namespace Compdfkit_Tools.PDFControl
{
    public partial class CPDFSearchControl : UserControl
    {
        /// <summary>
        /// PDFViewer
        /// </summary>
        private CPDFViewer pdfView;
        private int currentHighLightIndex { get; set; } = -1;

        private PDFTextSearch textSearch;

        private string keyWord;
        
        private bool isClearResult = false;
        

        private SolidColorBrush highLightBrush = new SolidColorBrush(Color.FromArgb(0x99, 0xFF, 0xF7, 0x00));
        
        public CPDFSearchControl()
        {
            InitializeComponent();
            Loaded += PDFSearch_Loaded;
        }

        public void InitWithPDFViewer(CPDFViewer newPDFView)
        {
            if(pdfView!=newPDFView)
            {
                ClearSearchResult();
                pdfView = newPDFView;
            }
        }

        private void PDFSearch_Loaded(object sender, RoutedEventArgs e)
        {
            textSearch = new PDFTextSearch();
            
            SearchInput.SearchEvent -= SearchInput_SearchEvent;
            SearchInput.ClearEvent -= SearchInput_ClearEvent;
            textSearch.SearchCompletedHandler -= TextSearch_SearchCompletedHandler;
            SearchResult.SelectionChanged -= SearchResult_SelectionChanged;
            textSearch.SearchPercentHandler -= TextSearch_SearchPercentHandler;
            textSearch.SearchCancelHandler -= TextSearch_SearchCancelHandler;
            
            SearchInput.SearchEvent += SearchInput_SearchEvent;
            SearchInput.ClearEvent += SearchInput_ClearEvent;
            textSearch.SearchCompletedHandler += TextSearch_SearchCompletedHandler;
            SearchResult.SelectionChanged += SearchResult_SelectionChanged;
            textSearch.SearchPercentHandler += TextSearch_SearchPercentHandler;
            textSearch.SearchCancelHandler += TextSearch_SearchCancelHandler;
        }

        private void TextSearch_SearchPercentHandler(object sender, TextSearchResult e)
        {
            Dispatcher.Invoke(() =>
            {
                if(!e.Items.ContainsKey(e.CurrentPage))
                {
                    return;
                }
                ProgressBar.ProgressValue = e.CurrentPage + 1;
                foreach (var item in e.Items[e.CurrentPage])
                {
                    if (item == null)
                    {
                        continue;
                    }
                    
                    var result = new BindSearchResult()
                    {
                        PageIndex = item.PageIndex,
                        TextContent = item.TextContent,
                        TextRect = item.TextRect,
                        SearchWord = keyWord,
                        HighLightColor = Color.FromArgb(0x99, 0xFF, 0xF7, 0x00),
                        PageRotate = item.PageRotate
                    };
                    SearchResult.AddSearchResult(result);
                    ResultNum.Text = SearchResult.ResultListControl.Items.Count.ToString();
                }
                
            });
        }

        private void SearchInput_ClearEvent(object sender, EventArgs e)
        {
            if (textSearch.CanDoSearch)
            {
                Dispatcher.Invoke(ClearSearchResult);
            }
            else
            {
                isClearResult = true;
                textSearch.CancleSearch();
            }
            ProgressBorder.Visibility = Visibility.Hidden;
        }
        
        private void TextSearch_SearchCancelHandler(object sender, TextSearchResult e)
        {
            if (isClearResult)
            {
                Dispatcher.Invoke(ClearSearchResult);
                isClearResult = false;
            }
        }

        private void SearchInput_FindPreviousEvent(object sender, EventArgs e)
        {
            if (currentHighLightIndex > 0)
            {
                currentHighLightIndex--;
                BindSearchResult result = SearchResult.GetItem(currentHighLightIndex);
                HighLightSelectResult(result);
            }
        }

        private void SearchInput_FindNextEvent(object sender, EventArgs e)
        {
            currentHighLightIndex++;
            if (currentHighLightIndex >= 0)
            {
                BindSearchResult result = SearchResult.GetItem(currentHighLightIndex);
                HighLightSelectResult(result);
            }
        }

        private void SearchResult_SelectionChanged(object sender, int e)
        {
            if (e < 0)
            {
                return;
            }
            currentHighLightIndex = e;
            BindSearchResult result = SearchResult.GetSelectItem();
            HighLightSelectResult(result);
            ResultNum.Text = "";
            ResultText.Text = LanguageHelper.BotaManager.GetString("Text_Result")+ (e+1) + "/" + SearchResult.ResultListControl.Items.Count;
        }

        private void TextSearch_SearchCompletedHandler(object sender, TextSearchResult e)
        {
            Dispatcher.Invoke(() =>
            {
                ProgressBorder.Visibility = Visibility.Hidden;
            });
        }

        private void SearchInput_SearchEvent(object sender, string e)
        {
            if (string.IsNullOrEmpty(e))
            {
                return;
            }

            if (pdfView == null || pdfView.Document == null)
            {
                return;
            }

            if (textSearch != null && textSearch.CanDoSearch)
            {
                ResultNum.Text = "0";
                ResultText.Text = LanguageHelper.BotaManager.GetString("Tip_Result");
                ProgressBar.ProgressMaxValue = pdfView.Document.PageCount;
                ProgressBorder.Visibility = Visibility.Visible;
                
                keyWord = e;
                textSearch.TextSearchDocument = pdfView.Document;
                SearchResult.ClearSearchResult();
                textSearch.SearchText(keyWord,C_Search_Options.Search_Case_Insensitive);
            }
        }

        private void HighLightSelectResult(BindSearchResult result)
        {
            if (result == null)
            {
                return;
            }

            List<TextSearchItem> selectList = new List<TextSearchItem>();
            selectList.Add(new TextSearchItem()
            {
                PageIndex = result.PageIndex,
                TextRect = result.TextRect,
                TextContent = result.TextContent,
                PageRotate = result.PageRotate,

            });
            pdfView.SetPageSelectText(selectList, highLightBrush);
        }

        private void ClearSearchResult()
        {
            SearchResult?.ClearSearchResult();
            ResultNum.Text = string.Empty;
            ResultText.Text = string.Empty;
            SearchInput.SearchKeyWord=string.Empty;
        }

        private void SearchCancel_Click(object sender, RoutedEventArgs e)
        {
            textSearch.CancleSearch();
        }
    }
}