Missing files + start working on offline patcher

SafeExamBrowser.Browser/Wrapper/Handlers/DragHandlerSwitch.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.Collections.Generic;
+using CefSharp;
+using CefSharp.Enums;
+using CefSharp.WinForms;
+using CefSharp.WinForms.Host;
+using SafeExamBrowser.Browser.Wrapper.Events;
+
+namespace SafeExamBrowser.Browser.Wrapper.Handlers
+{
+	internal class DragHandlerSwitch : IDragHandler
+	{
+		public bool OnDragEnter(IWebBrowser webBrowser, IBrowser browser, IDragData dragData, DragOperationsMask mask)
+		{
+			var args = new GenericEventArgs();
+
+			if (browser.IsPopup)
+			{
+				var control = ChromiumHostControl.FromBrowser(browser) as CefSharpPopupControl;
+
+				control?.OnDragEnter(webBrowser, browser, dragData, mask, args);
+			}
+			else
+			{
+				var control = ChromiumWebBrowser.FromBrowser(browser) as CefSharpBrowserControl;
+
+				control?.OnDragEnter(webBrowser, browser, dragData, mask, args);
+			}
+
+			return args.Value;
+		}
+
+		public void OnDraggableRegionsChanged(IWebBrowser webBrowser, IBrowser browser, IFrame frame, IList<DraggableRegion> regions)
+		{
+			if (browser.IsPopup)
+			{
+				var control = ChromiumHostControl.FromBrowser(browser) as CefSharpPopupControl;
+
+				control?.OnDraggableRegionsChanged(webBrowser, browser, frame, regions);
+			}
+			else
+			{
+				var control = ChromiumWebBrowser.FromBrowser(browser) as CefSharpBrowserControl;
+
+				control?.OnDraggableRegionsChanged(webBrowser, browser, frame, regions);
+			}
+		}
+	}
+}