Restore SEBPatch

SafeExamBrowser.Applications/ExternalApplicationWindow.cs

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+/*
+ * 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.Applications.Contracts;
+using SafeExamBrowser.Applications.Contracts.Events;
+using SafeExamBrowser.Core.Contracts.Resources.Icons;
+using SafeExamBrowser.WindowsApi.Contracts;
+
+namespace SafeExamBrowser.Applications
+{
+	internal class ExternalApplicationWindow : IApplicationWindow
+	{
+		private readonly INativeMethods nativeMethods;
+
+		public IntPtr Handle { get; }
+		public IconResource Icon { get; private set; }
+		public string Title { get; private set; }
+
+		public event IconChangedEventHandler IconChanged;
+		public event TitleChangedEventHandler TitleChanged;
+
+		internal ExternalApplicationWindow(IconResource icon, INativeMethods nativeMethods, IntPtr handle)
+		{
+			this.Handle = handle;
+			this.Icon = icon;
+			this.nativeMethods = nativeMethods;
+		}
+
+		public void Activate()
+		{
+			nativeMethods.ActivateWindow(Handle);
+		}
+
+		internal void Update()
+		{
+			var icon = nativeMethods.GetWindowIcon(Handle);
+			var iconChanged = icon != IntPtr.Zero && (!(Icon is NativeIconResource) || Icon is NativeIconResource r && r.Handle != icon);
+			var title = nativeMethods.GetWindowTitle(Handle);
+			var titleChanged = Title?.Equals(title, StringComparison.Ordinal) != true;
+
+			if (iconChanged)
+			{
+				Icon = new NativeIconResource { Handle = icon };
+				IconChanged?.Invoke(Icon);
+			}
+
+			if (titleChanged)
+			{
+				Title = title;
+				TitleChanged?.Invoke(title);
+			}
+		}
+	}
+}