Missing files + start working on offline patcher

SafeExamBrowser.Browser/Handlers/JavaScriptDialogHandler.cs

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+/*
+ * Copyright (c) 2025 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using System.Threading.Tasks;
+using CefSharp;
+using SafeExamBrowser.Browser.Events;
+
+namespace SafeExamBrowser.Browser.Handlers
+{
+	internal class JavaScriptDialogHandler : IJsDialogHandler
+	{
+		internal event JavaScriptDialogRequestedEventHandler DialogRequested;
+
+		public bool OnBeforeUnloadDialog(IWebBrowser webBrowser, IBrowser browser, string message, bool isReload, IJsDialogCallback callback)
+		{
+			var args = new JavaScriptDialogRequestedEventArgs
+			{
+				Type = isReload ? JavaScriptDialogType.Reload : JavaScriptDialogType.LeavePage
+			};
+
+			Task.Run(() =>
+			{
+				DialogRequested?.Invoke(args);
+
+				using (callback)
+				{
+					callback.Continue(args.Success);
+				}
+			});
+
+			return true;
+		}
+
+		public void OnDialogClosed(IWebBrowser webBrowser, IBrowser browser)
+		{
+		}
+
+		public bool OnJSDialog(IWebBrowser webBrowser, IBrowser browser, string originUrl, CefJsDialogType type, string message, string promptText, IJsDialogCallback callback, ref bool suppress)
+		{
+			return false;
+		}
+
+		public void OnResetDialogState(IWebBrowser webBrowser, IBrowser browser)
+		{
+		}
+	}
+}