kmpdfkit_demo/Demo/Examples/Compdfkit_Tools/PDFView/PDFPageTurning/PDFPageTurningControl/CPDFPageTurningControl.xaml.cs

using Compdfkit_Tools.PDFControlUI;
using ComPDFKitViewer.PdfViewer;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Compdfkit_Tools.PDFControl
{
    /// <summary>
    /// PDFPageTurningControl.xaml 的交互逻辑
    /// </summary>
    public partial class CPDFPageTurningControl : UserControl
    {
        public CPDFViewer pdfViewer;

        public CPDFPageTurningControl()
        {
            InitializeComponent();
            CPDFPageTurningUI.Loaded += PDFPageTurningUI_Loaded;
        }

        public void InitWithPDFViewer(CPDFViewer pdfViewer)
        {
            this.pdfViewer = pdfViewer;
            pdfViewer.InfoChanged += PdfViewer_InfoChanged;
        }

        /// <summary>
        /// 翻页传递到自定义控件中,修改页码
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void PdfViewer_InfoChanged(object sender, KeyValuePair<string, object> e)
        {
            if (e.Key == "PageNum")
            {
                CPDFPageTurningUI.PageIndex = pdfViewer.CurrentIndex + 1;
            }
        }

        private void PDFPageTurningUI_Loaded(object sender, RoutedEventArgs e)
        {
            CPDFPageTurningUI.EnsureKey = Key.Enter;
            CPDFPageTurningUI.GoToSpecificPageEvent += PDFPageTurningUI_GoToSpecificPageEvent;
            CPDFPageTurningUI.GoToNextPageEvent += PDFPageTurningUI_GoToNextPageEvent;
            CPDFPageTurningUI.GoToPreviousPageEvent += PDFPageTurningUI_GoToPreviousPageEvent;
        }

        /// <summary>
        /// 需要注意：
        /// 在GoToPage之后不可以马上获取页码，此时页码正在延迟渲染
        /// 页码变换的引起UI变化的函数应该写在PdfViewer_InfoChanged中
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void PDFPageTurningUI_GoToPreviousPageEvent(object sender, EventArgs e)
        {
            if (pdfViewer == null || pdfViewer.Document == null)
            {
                return;
            }
            if (pdfViewer.CurrentIndex <= 0)
            {
                return;
            }
            if (pdfViewer.ModeView == ComPDFKitViewer.ViewMode.Single || pdfViewer.ModeView == ComPDFKitViewer.ViewMode.SingleContinuous)
            {
                pdfViewer.GoToPage(pdfViewer.CurrentIndex - 1);
            }
            else
            {
                pdfViewer.GoToPage(pdfViewer.CurrentIndex - 2);
            }
        }

        private void PDFPageTurningUI_GoToNextPageEvent(object sender, EventArgs e)
        {
            if (pdfViewer == null || pdfViewer.Document == null)
            {
                return;
            }
            if (pdfViewer.CurrentIndex >= pdfViewer.Document.PageCount)
            {
                return;
            }

            if (pdfViewer.ModeView == ComPDFKitViewer.ViewMode.Single || pdfViewer.ModeView == ComPDFKitViewer.ViewMode.SingleContinuous)
            {
                pdfViewer.GoToPage(pdfViewer.CurrentIndex + 1);
            }
            else
            {
                pdfViewer.GoToPage(pdfViewer.CurrentIndex + 2);
            }
        }

        private void PDFPageTurningUI_GoToSpecificPageEvent(object sender, int e)
        {
            if (pdfViewer == null || pdfViewer.Document == null)
            {
                return;
            }
            if (e >= 1 && e <= pdfViewer.Document.PageCount)
            {
                pdfViewer.GoToPage(e - 1);
            }
        }
    }
}