Restore SEBPatch

SafeExamBrowser.Browser/Handlers/KeyboardHandler.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.Windows.Forms;
+using CefSharp;
+using SafeExamBrowser.Browser.Contracts.Events;
+using SafeExamBrowser.UserInterface.Contracts;
+
+namespace SafeExamBrowser.Browser.Handlers
+{
+	internal class KeyboardHandler : IKeyboardHandler
+	{
+		internal event ActionRequestedEventHandler FindRequested;
+		internal event ActionRequestedEventHandler HomeNavigationRequested;
+		internal event ActionRequestedEventHandler ReloadRequested;
+		internal event ActionRequestedEventHandler ZoomInRequested;
+		internal event ActionRequestedEventHandler ZoomOutRequested;
+		internal event ActionRequestedEventHandler ZoomResetRequested;
+		internal event ActionRequestedEventHandler FocusAddressBarRequested;
+		internal event TabPressedEventHandler TabPressed;
+
+		private int? currentKeyDown = null;
+
+		public bool OnKeyEvent(IWebBrowser browserControl, IBrowser browser, KeyType type, int keyCode, int nativeKeyCode, CefEventFlags modifiers, bool isSystemKey)
+		{
+			var ctrl = modifiers.HasFlag(CefEventFlags.ControlDown);
+			var shift = modifiers.HasFlag(CefEventFlags.ShiftDown);
+
+			if (type == KeyType.KeyUp)
+			{
+				if (ctrl && keyCode == (int) Keys.F)
+				{
+					FindRequested?.Invoke();
+				}
+
+				if (keyCode == (int) Keys.Home)
+				{
+					HomeNavigationRequested?.Invoke();
+				}
+
+				if (ctrl && keyCode == (int) Keys.L)
+				{
+					FocusAddressBarRequested?.Invoke();
+				}
+
+				if ((ctrl && keyCode == (int) Keys.Add) || (ctrl && keyCode == (int) Keys.Oemplus) || (ctrl && shift && keyCode == (int) Keys.D1))
+				{
+					ZoomInRequested?.Invoke();
+				}
+
+				if (ctrl && (keyCode == (int) Keys.Subtract || keyCode == (int) Keys.OemMinus))
+				{
+					ZoomOutRequested?.Invoke();
+				}
+
+				if (ctrl && (keyCode == (int) Keys.D0 || keyCode == (int) Keys.NumPad0))
+				{
+					ZoomResetRequested?.Invoke();
+				}
+
+				if (keyCode == (int) Keys.Tab && keyCode == currentKeyDown)
+				{
+					TabPressed?.Invoke(shift);
+				}
+			}
+
+			currentKeyDown = null;
+			return false;
+		}
+
+		public bool OnPreKeyEvent(IWebBrowser browserControl, IBrowser browser, KeyType type, int keyCode, int nativeKeyCode, CefEventFlags modifiers, bool isSystemKey, ref bool isKeyboardShortcut)
+		{
+			if (type == KeyType.KeyUp && keyCode == (int) Keys.F5)
+			{
+				ReloadRequested?.Invoke();
+
+				return true;
+			}
+
+			if (type == KeyType.RawKeyDown || type == KeyType.KeyDown)
+			{
+				currentKeyDown = keyCode;
+			}
+
+			return false;
+		}
+	}
+}