Restore SEBPatch

SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/RaiseHandControl.xaml.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.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+using System.Windows.Media;
+using SafeExamBrowser.Core.Contracts.Resources.Icons;
+using SafeExamBrowser.I18n.Contracts;
+using SafeExamBrowser.Proctoring.Contracts;
+using SafeExamBrowser.Settings.Proctoring;
+using SafeExamBrowser.UserInterface.Contracts.Shell;
+using SafeExamBrowser.UserInterface.Shared.Utilities;
+
+namespace SafeExamBrowser.UserInterface.Mobile.Controls.ActionCenter
+{
+	public partial class RaiseHandControl : UserControl, INotificationControl
+	{
+		private readonly IProctoringController controller;
+		private readonly ProctoringSettings settings;
+		private readonly IText text;
+
+		private IconResource LoweredIcon;
+		private IconResource RaisedIcon;
+
+		public RaiseHandControl(IProctoringController controller, ProctoringSettings settings, IText text)
+		{
+			this.controller = controller;
+			this.settings = settings;
+			this.text = text;
+
+			InitializeComponent();
+			InitializeRaiseHandControl();
+		}
+
+		private void InitializeRaiseHandControl()
+		{
+			var originalBrush = Grid.Background;
+
+			controller.HandLowered += () => Dispatcher.Invoke(ShowLowered);
+			controller.HandRaised += () => Dispatcher.Invoke(ShowRaised);
+
+			HandButton.Click += RaiseHandButton_Click;
+			HandButtonText.Text = text.Get(TextKey.Notification_ProctoringRaiseHand);
+
+			LoweredIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Desktop;component/Images/Hand_Lowered.xaml") };
+			RaisedIcon = new XamlIconResource { Uri = new Uri("pack://application:,,,/SafeExamBrowser.UserInterface.Desktop;component/Images/Hand_Raised.xaml") };
+			Icon.Content = IconResourceLoader.Load(LoweredIcon);
+
+			var lastOpenedBySpacePress = false;
+			NotificationButton.PreviewKeyDown += (o, args) =>
+			{
+				if (args.Key == System.Windows.Input.Key.Space)                 // for some reason, the popup immediately closes again if opened by a Space Bar key event - as a mitigation, we record the space bar event and leave the popup open for at least 3 seconds
+				{
+					lastOpenedBySpacePress = true;
+				}
+			};
+			NotificationButton.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && lastOpenedBySpacePress)
+				{
+					return;
+				}
+				Popup.IsOpen = Popup.IsMouseOver;
+			}));
+			NotificationButton.PreviewMouseLeftButtonUp += NotificationButton_PreviewMouseLeftButtonUp;
+			NotificationButton.PreviewMouseRightButtonUp += NotificationButton_PreviewMouseRightButtonUp;
+			NotificationButton.ToolTip = text.Get(TextKey.Notification_ProctoringHandLowered);
+
+			Popup.CustomPopupPlacementCallback = new CustomPopupPlacementCallback(Popup_PlacementCallback);
+			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() =>
+			{
+				if (Popup.IsOpen && lastOpenedBySpacePress)
+				{
+					return;
+				}
+				Popup.IsOpen = IsMouseOver;
+			}));
+			Popup.Opened += (o, args) => Grid.Background = Brushes.Gray;
+			Popup.Closed += (o, args) =>
+			{
+				Grid.Background = originalBrush;
+				lastOpenedBySpacePress = false;
+			};
+
+			Text.Text = text.Get(TextKey.Notification_ProctoringHandLowered);
+		}
+
+		private void NotificationButton_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
+		{
+			if (settings.ForceRaiseHandMessage || Popup.IsOpen)
+			{
+				Popup.IsOpen = !Popup.IsOpen;
+			}
+			else
+			{
+				ToggleHand();
+			}
+		}
+
+		private void NotificationButton_PreviewMouseRightButtonUp(object sender, MouseButtonEventArgs e)
+		{
+			Popup.IsOpen = !Popup.IsOpen;
+		}
+
+		private CustomPopupPlacement[] Popup_PlacementCallback(Size popupSize, Size targetSize, Point offset)
+		{
+			return new[]
+			{
+				new CustomPopupPlacement(new Point(targetSize.Width / 2 - popupSize.Width / 2, -popupSize.Height), PopupPrimaryAxis.None)
+			};
+		}
+
+		private void RaiseHandButton_Click(object sender, RoutedEventArgs e)
+		{
+			ToggleHand();
+		}
+
+		private void ToggleHand()
+		{
+			if (controller.IsHandRaised)
+			{
+				controller.LowerHand();
+			}
+			else
+			{
+				controller.RaiseHand(Message.Text);
+				Message.Clear();
+			}
+		}
+
+		private void ShowLowered()
+		{
+			HandButtonText.Text = text.Get(TextKey.Notification_ProctoringRaiseHand);
+			Icon.Content = IconResourceLoader.Load(LoweredIcon);
+			Message.IsEnabled = true;
+			NotificationButton.ToolTip = text.Get(TextKey.Notification_ProctoringHandLowered);
+			Popup.IsOpen = false;
+			Text.Text = text.Get(TextKey.Notification_ProctoringHandLowered);
+		}
+
+		private void ShowRaised()
+		{
+			HandButtonText.Text = text.Get(TextKey.Notification_ProctoringLowerHand);
+			Icon.Content = IconResourceLoader.Load(RaisedIcon);
+			Message.IsEnabled = false;
+			NotificationButton.ToolTip = text.Get(TextKey.Notification_ProctoringHandRaised);
+			Text.Text = text.Get(TextKey.Notification_ProctoringHandRaised);
+		}
+	}
+}