Restore SEBPatch

SafeExamBrowser.UserInterface.Shared/Activators/TouchActivator.cs

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2024 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;
+using SafeExamBrowser.WindowsApi.Contracts;
+using SafeExamBrowser.WindowsApi.Contracts.Events;
+
+namespace SafeExamBrowser.UserInterface.Shared.Activators
+{
+	public abstract class TouchActivator
+	{
+		private Guid? hookId;
+		private INativeMethods nativeMethods;
+		protected bool paused;
+
+		protected TouchActivator(INativeMethods nativeMethods)
+		{
+			this.nativeMethods = nativeMethods;
+		}
+
+		protected abstract void OnBeforeResume();
+		protected abstract bool Process(MouseButton button, MouseButtonState state, MouseInformation info);
+
+		public void Pause()
+		{
+			paused = true;
+		}
+
+		public void Resume()
+		{
+			OnBeforeResume();
+			paused = false;
+		}
+
+		public void Start()
+		{
+			hookId = nativeMethods.RegisterMouseHook(MouseHookCallback);
+		}
+
+		public void Stop()
+		{
+			if (hookId.HasValue)
+			{
+				nativeMethods.DeregisterMouseHook(hookId.Value);
+			}
+		}
+
+		private bool MouseHookCallback(MouseButton button, MouseButtonState state, MouseInformation info)
+		{
+			if (!paused && info.IsTouch)
+			{
+				return Process(button, state, info);
+			}
+
+			return false;
+		}
+	}
+}