我需要向CefSharp提供任何标志来使用文档元素吗？

问题描述

我转换了我的一个窗口以使用CefSharp来渲染一些PDF文件。受支持的旧组件（WPF的WebBrowser，不幸的是依赖IE，在这种情况下不起作用）的功能之一就是通过代码访问javascript元素，以了解何时将PDF滚动到底部。不幸的是，使用以下代码，这似乎不适用于CefSharp。也许我缺少一些初始化器标记才能使它工作？

当前在我的日志中，我得到的只是ScrollProgress | 0 | 0 | 734

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.Forms;
using System.Windows.Forms.Integration;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using CefSharp;
using NLog;
using Application = System.Windows.Application;
using MessageBox = System.Windows.MessageBox;
using WebBrowser = System.Windows.Forms.WebBrowser;

namespace MyNamespace
{
    public partial class PdfConfirmWindow : Window
    {
        private static readonly ILogger Log = LogManager.GetLogger(nameof(PdfConfirmWindow));

        public PdfConfirmWindow()
        {
            InitializeComponent();
        }

        private void WindowLoaded(object sender,RoutedEventArgs e)
        {
            ChromiumWebBrowser.LoadingStateChanged += ChromiumWebBrowserOnLoadingStateChanged;
            UpdateBrowserContent();
        }

        private void ChromiumWebBrowserOnLoadingStateChanged(object sender,LoadingStateChangedEventArgs e)
        {
            if (!e.IsLoading)
            {
                Log.Debug("Loading completed");
                
                Application.Current.Dispatcher.BeginInvoke(new Action(() =>
                {
                    // (window.innerHeight + window.scrollY) >= document.body.offsetHeight
                    // e.scrollHeight - e.scrollTop === e.clientHeight
                    // CefSharp.PostMessage('EndOfDocumentReached');

                    const string script = @"

(function(){
    var intervalHandler;
    function onScrollCallback() {
        var e = document.body;
        var values = ['ScrollProgress'];
        values.push(document.body.clientHeight);
        values.push(window.scrollY);
        values.push(window.innerHeight);

        CefSharp.PostMessage(values.join('|'));

        if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight){
            //clearInterval(intervalHandler);
        }
    }

    setTimeout(function(){
        var intervalHandler = setInterval(function(){
            onScrollCallback();
        },100);
    },500);

})();

";
                    ChromiumWebBrowser.Focus();
                    ChromiumWebBrowser.WebBrowser.JavascriptMessageReceived += WebBrowserOnJavascriptMessageReceived;
                    ChromiumWebBrowser.WebBrowser.ExecuteScriptAsync(script);
                }));
            }
        }

        private async void WebBrowserOnJavascriptMessageReceived(object sender,JavascriptMessageReceivedEventArgs e)
        {
            await UIHelper.Thread;

            // ChromiumWebBrowser.WebBrowser.JavascriptMessageReceived -= WebBrowserOnJavascriptMessageReceived;
            if (e.Message?.ToString().Equals("EndOfDocumentReached",StringComparison.OrdinalIgnoreCase) == true)
            {
                SetReachedStatus(true);
            }
            if (e.Message?.ToString().StartsWith("ScrollProgress",StringComparison.OrdinalIgnoreCase) == true)
            {
                Log.Debug(e.Message?.ToString());
            }
        }
}

解决方法

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