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262
SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs
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262
SafeExamBrowser.UserInterface.Mobile/Windows/Taskbar.xaml.cs
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/*
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* Copyright (c) 2024 ETH Zürich, IT Services
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System;
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using System.ComponentModel;
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using System.Windows;
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using SafeExamBrowser.Browser.Contracts.Events;
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using SafeExamBrowser.I18n.Contracts;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.UserInterface.Contracts.Shell;
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using SafeExamBrowser.UserInterface.Contracts.Shell.Events;
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using SafeExamBrowser.UserInterface.Shared.Utilities;
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namespace SafeExamBrowser.UserInterface.Mobile.Windows
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{
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internal partial class Taskbar : Window, ITaskbar
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{
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private bool allowClose;
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private readonly ILogger logger;
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private bool isQuitButtonFocusedAtKeyDown;
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private bool isFirstChildFocusedAtKeyDown;
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public bool ShowClock
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{
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set { Dispatcher.Invoke(() => Clock.Visibility = value ? Visibility.Visible : Visibility.Collapsed); }
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}
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public bool ShowQuitButton
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{
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set { Dispatcher.Invoke(() => QuitButton.Visibility = value ? Visibility.Visible : Visibility.Collapsed); }
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}
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public event LoseFocusRequestedEventHandler LoseFocusRequested;
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public event QuitButtonClickedEventHandler QuitButtonClicked;
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internal Taskbar(ILogger logger)
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{
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this.logger = logger;
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InitializeComponent();
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InitializeTaskbar();
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}
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public void AddApplicationControl(IApplicationControl control, bool atFirstPosition = false)
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{
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if (control is UIElement uiElement)
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{
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if (atFirstPosition)
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{
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ApplicationStackPanel.Children.Insert(0, uiElement);
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}
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else
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{
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ApplicationStackPanel.Children.Add(uiElement);
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}
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}
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}
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public void AddNotificationControl(INotificationControl control)
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{
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if (control is UIElement uiElement)
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{
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NotificationStackPanel.Children.Add(uiElement);
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}
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}
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public void AddSystemControl(ISystemControl control)
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{
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if (control is UIElement uiElement)
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{
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SystemControlStackPanel.Children.Add(uiElement);
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}
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}
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public new void Close()
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{
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Dispatcher.Invoke(base.Close);
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}
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public void Focus(bool fromTop)
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{
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Dispatcher.BeginInvoke((Action) (() =>
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{
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Activate();
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if (fromTop && ApplicationStackPanel.Children.Count > 0)
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{
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ApplicationStackPanel.Children[0].Focus();
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}
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else
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{
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QuitButton.Focus();
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}
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}));
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}
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public int GetAbsoluteHeight()
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{
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return Dispatcher.Invoke(() =>
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{
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var height = (int) this.TransformToPhysical(Width, Height).Y;
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logger.Debug($"Calculated physical taskbar height is {height}px.");
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return height;
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});
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}
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public int GetRelativeHeight()
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{
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return Dispatcher.Invoke(() =>
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{
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var height = (int) Height;
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logger.Debug($"Logical taskbar height is {height}px.");
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return height;
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});
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}
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public void InitializeBounds()
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{
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Dispatcher.Invoke(() =>
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{
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Width = SystemParameters.PrimaryScreenWidth;
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Left = 0;
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Top = SystemParameters.PrimaryScreenHeight - Height;
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var position = this.TransformToPhysical(Left, Top);
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var size = this.TransformToPhysical(Width, Height);
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logger.Debug($"Set taskbar bounds to {Width}x{Height} at ({Left}/{Top}), in physical pixels: {size.X}x{size.Y} at ({position.X}/{position.Y}).");
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});
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}
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private void InitializeTaskbar()
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{
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Closing += Taskbar_Closing;
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Loaded += (o, args) => InitializeBounds();
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QuitButton.Clicked += QuitButton_Clicked;
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}
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public void InitializeText(IText text)
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{
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Dispatcher.Invoke(() =>
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{
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var txt = text.Get(TextKey.Shell_QuitButton);
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QuitButton.ToolTip = txt;
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QuitButton.SetValue(System.Windows.Automation.AutomationProperties.NameProperty, txt);
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});
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}
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public void Register(ITaskbarActivator activator)
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{
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activator.Activated += Activator_Activated;
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}
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public new void Show()
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{
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Dispatcher.Invoke(base.Show);
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}
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private void Activator_Activated()
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{
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(this as ITaskbar).Focus(true);
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}
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private void QuitButton_Clicked(CancelEventArgs args)
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{
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QuitButtonClicked?.Invoke(args);
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allowClose = !args.Cancel;
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}
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private void Taskbar_Closing(object sender, CancelEventArgs e)
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{
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if (allowClose)
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{
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foreach (var child in SystemControlStackPanel.Children)
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{
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if (child is ISystemControl systemControl)
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{
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systemControl.Close();
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}
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}
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}
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else
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{
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e.Cancel = true;
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}
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}
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private void Window_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
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{
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isQuitButtonFocusedAtKeyDown = QuitButton.IsKeyboardFocusWithin;
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isFirstChildFocusedAtKeyDown = ApplicationStackPanel.Children.Count > 0 && ApplicationStackPanel.Children[0].IsKeyboardFocusWithin;
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}
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private void Window_KeyUp(object sender, System.Windows.Input.KeyEventArgs e)
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{
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if (e.Key == System.Windows.Input.Key.Tab)
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{
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var shift = System.Windows.Input.Keyboard.IsKeyDown(System.Windows.Input.Key.LeftShift);
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var hasFocus = ApplicationStackPanel.Children.Count > 0 && ApplicationStackPanel.Children[0].IsKeyboardFocusWithin;
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if (!shift && hasFocus && isQuitButtonFocusedAtKeyDown)
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{
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LoseFocusRequested?.Invoke(true);
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e.Handled = true;
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}
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else if (shift && QuitButton.IsKeyboardFocusWithin && isFirstChildFocusedAtKeyDown)
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{
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LoseFocusRequested?.Invoke(false);
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e.Handled = true;
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}
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}
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isQuitButtonFocusedAtKeyDown = false;
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isFirstChildFocusedAtKeyDown = false;
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}
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private bool SetFocusWithin(UIElement uIElement)
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{
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if (uIElement.Focusable)
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{
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uIElement.Focus();
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return true;
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}
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if (uIElement is System.Windows.Controls.Panel)
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{
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var panel = uIElement as System.Windows.Controls.Panel;
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for (var i = 0; i < panel.Children.Count; i++)
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{
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if (SetFocusWithin(panel.Children[i]))
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{
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return true;
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}
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}
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return false;
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}
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else if (uIElement is System.Windows.Controls.ContentControl)
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{
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var control = uIElement as System.Windows.Controls.ContentControl;
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var content = control.Content as UIElement;
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if (content != null)
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{
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return SetFocusWithin(content);
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}
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}
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return false;
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}
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}
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}
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