Restore SEBPatch

SafeExamBrowser.UserInterface.Shared/Utilities/IconResourceLoader.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 System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Interop;
+using System.Windows.Markup;
+using System.Windows.Media.Imaging;
+using SafeExamBrowser.Core.Contracts.Resources.Icons;
+using Brushes = System.Windows.Media.Brushes;
+using Image = System.Windows.Controls.Image;
+
+namespace SafeExamBrowser.UserInterface.Shared.Utilities
+{
+	public static class IconResourceLoader
+	{
+		public static UIElement Load(IconResource resource)
+		{
+			try
+			{
+				switch (resource)
+				{
+					case BitmapIconResource bitmap:
+						return LoadBitmapResource(bitmap);
+					case EmbeddedIconResource embedded:
+						return LoadEmbeddedResource(embedded);
+					case NativeIconResource native:
+						return LoadNativeResource(native);
+					case XamlIconResource xaml:
+						return LoadXamlResource(xaml);
+					default:
+						throw new NotSupportedException($"Application icon resource of type '{resource.GetType()}' is not supported!");
+				}
+			}
+			catch (Exception)
+			{
+				return NotFoundSymbol();
+			}
+		}
+
+		private static UIElement LoadBitmapResource(BitmapIconResource resource)
+		{
+			return new Image
+			{
+				Source = new BitmapImage(resource.Uri)
+			};
+		}
+
+		private static UIElement LoadEmbeddedResource(EmbeddedIconResource resource)
+		{
+			using (var stream = new MemoryStream())
+			{
+				var bitmap = new BitmapImage();
+
+				Icon.ExtractAssociatedIcon(resource.FilePath).ToBitmap().Save(stream, ImageFormat.Png);
+
+				bitmap.BeginInit();
+				bitmap.StreamSource = stream;
+				bitmap.CacheOption = BitmapCacheOption.OnLoad;
+				bitmap.EndInit();
+				bitmap.Freeze();
+
+				return new Image
+				{
+					Source = bitmap
+				};
+			}
+		}
+
+		private static UIElement LoadNativeResource(NativeIconResource resource)
+		{
+			return new Image
+			{
+				Source = Imaging.CreateBitmapSourceFromHIcon(resource.Handle, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions())
+			};
+		}
+
+		private static UIElement LoadXamlResource(XamlIconResource resource)
+		{
+			using (var stream = Application.GetResourceStream(resource.Uri)?.Stream)
+			{
+				return XamlReader.Load(stream) as UIElement;
+			}
+		}
+
+		private static UIElement NotFoundSymbol()
+		{
+			return new TextBlock(new Run("X") { Foreground = Brushes.Red, FontWeight = FontWeights.Bold })
+			{
+				HorizontalAlignment = HorizontalAlignment.Center,
+				VerticalAlignment = VerticalAlignment.Center
+			};
+		}
+	}
+}