From 0a184e3c8e1c1085430402052d344d4b1547b0d5 Mon Sep 17 00:00:00 2001
From: dbuechel <damian.buechel@let.ethz.ch>
Date: Fri, 15 Mar 2019 14:50:27 +0100
Subject: [PATCH] SEBWIN-106: Ensured the main browser window cannot be closed
 by the user.

---
 .../BrowserWindow.xaml.cs                     | 34 ++++++++++++++-----
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/SafeExamBrowser.UserInterface.Desktop/BrowserWindow.xaml.cs b/SafeExamBrowser.UserInterface.Desktop/BrowserWindow.xaml.cs
index e83f333e..878f017e 100644
--- a/SafeExamBrowser.UserInterface.Desktop/BrowserWindow.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Desktop/BrowserWindow.xaml.cs
@@ -7,6 +7,7 @@
  */
 
 using System;
+using System.ComponentModel;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Input;
@@ -78,7 +79,12 @@ namespace SafeExamBrowser.UserInterface.Desktop
 
 		public new void Close()
 		{
-			Dispatcher.Invoke(base.Close);
+			Dispatcher.Invoke(() =>
+			{
+				Closing -= BrowserWindow_Closing;
+				closing?.Invoke();
+				base.Close();
+			});
 		}
 
 		public new void Hide()
@@ -128,12 +134,15 @@ namespace SafeExamBrowser.UserInterface.Desktop
 			LoadText();
 		}
 
-		private void UrlTextBox_GotMouseCapture(object sender, MouseEventArgs e)
+		private void BrowserWindow_Closing(object sender, CancelEventArgs e)
 		{
-			if (UrlTextBox.Tag as bool? != true)
+			if (isMainWindow)
 			{
-				UrlTextBox.SelectAll();
-				UrlTextBox.Tag = true;
+				e.Cancel = true;
+			}
+			else
+			{
+				closing?.Invoke();
 			}
 		}
 
@@ -145,6 +154,15 @@ namespace SafeExamBrowser.UserInterface.Desktop
 			}
 		}
 
+		private void UrlTextBox_GotMouseCapture(object sender, MouseEventArgs e)
+		{
+			if (UrlTextBox.Tag as bool? != true)
+			{
+				UrlTextBox.SelectAll();
+				UrlTextBox.Tag = true;
+			}
+		}
+
 		private void UrlTextBox_KeyUp(object sender, KeyEventArgs e)
 		{
 			if (e.Key == Key.Enter)
@@ -158,13 +176,13 @@ namespace SafeExamBrowser.UserInterface.Desktop
 			var originalBrush = MenuButton.Background;
 
 			BackwardButton.Click += (o, args) => BackwardNavigationRequested?.Invoke();
-			Closing += (o, args) => closing?.Invoke();
+			Closing += BrowserWindow_Closing;
 			ForwardButton.Click += (o, args) => ForwardNavigationRequested?.Invoke();
 			MenuButton.Click += (o, args) => MenuPopup.IsOpen = !MenuPopup.IsOpen;
 			MenuButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => MenuPopup.IsOpen = MenuPopup.IsMouseOver));
-			MenuPopup.Closed += (o, args) => { MenuButton.Background = originalBrush; };
+			MenuPopup.Closed += (o, args) => MenuButton.Background = originalBrush;
 			MenuPopup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => MenuPopup.IsOpen = IsMouseOver));
-			MenuPopup.Opened += (o, args) => { MenuButton.Background = Brushes.LightGray; };
+			MenuPopup.Opened += (o, args) => MenuButton.Background = Brushes.LightGray;
 			KeyUp += BrowserWindow_KeyUp;
 			ReloadButton.Click += (o, args) => ReloadRequested?.Invoke();
 			UrlTextBox.GotKeyboardFocus += (o, args) => UrlTextBox.SelectAll();