From 2104f401ec9affd04be4ca27e5acc99168bad414 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Damian=20B=C3=BCchel?= <damian.buechel@let.ethz.ch>
Date: Mon, 17 Jul 2017 08:28:18 +0200
Subject: [PATCH] Working on multiple instance and multiple application layout
 of taskbar.

---
 .../Behaviour/StartupController.cs            | 23 ++++++++++-
 .../Controls/ApplicationButton.xaml           | 13 +++++--
 .../Controls/ApplicationButton.xaml.cs        | 15 +++++---
 .../ApplicationInstanceButton.xaml.cs         |  2 +-
 SafeExamBrowser.UserInterface/Taskbar.xaml    |  8 +++-
 SafeExamBrowser.UserInterface/Taskbar.xaml.cs | 33 +++++++++++++++-
 SafeExamBrowser/App.cs                        | 38 +++++++++----------
 7 files changed, 98 insertions(+), 34 deletions(-)

diff --git a/SafeExamBrowser.Core/Behaviour/StartupController.cs b/SafeExamBrowser.Core/Behaviour/StartupController.cs
index f25bfaab..86d40035 100644
--- a/SafeExamBrowser.Core/Behaviour/StartupController.cs
+++ b/SafeExamBrowser.Core/Behaviour/StartupController.cs
@@ -171,16 +171,35 @@ namespace SafeExamBrowser.Core.Behaviour
 
 		private void InitializeBrowser()
 		{
-			var browserButton = uiFactory.CreateApplicationButton(browserInfo);
-
 			logger.Info("Initializing browser.");
 			splashScreen.UpdateText(Key.SplashScreen_InitializeBrowser);
 
+			var browserButton = uiFactory.CreateApplicationButton(browserInfo);
+
 			browserController.RegisterApplicationButton(browserButton);
 
 			// TODO
 
 			taskbar.AddButton(browserButton);
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.AddButton(uiFactory.CreateApplicationButton(browserInfo));
+			taskbar.SetPosition(500, 500);
 		}
 
 		private void FinishInitialization()
diff --git a/SafeExamBrowser.UserInterface/Controls/ApplicationButton.xaml b/SafeExamBrowser.UserInterface/Controls/ApplicationButton.xaml
index 57c6041d..f028afc1 100644
--- a/SafeExamBrowser.UserInterface/Controls/ApplicationButton.xaml
+++ b/SafeExamBrowser.UserInterface/Controls/ApplicationButton.xaml
@@ -4,15 +4,20 @@
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
              xmlns:local="clr-namespace:SafeExamBrowser.UserInterface.Controls"
+             xmlns:s="clr-namespace:System;assembly=mscorlib"
              mc:Ignorable="d" 
              d:DesignHeight="40" d:DesignWidth="50">
     <Grid>
         <Popup x:Name="InstancePopup" IsOpen="False" Placement="Top" PlacementTarget="{Binding ElementName=Button}" AllowsTransparency="True">
-            <StackPanel x:Name="InstanceStackPanel">
-                <StackPanel.Background>
+            <ScrollViewer x:Name="InstanceScrollViewer" VerticalScrollBarVisibility="Auto">
+                <ScrollViewer.Background>
                     <SolidColorBrush Color="Black" Opacity="0.8"/>
-                </StackPanel.Background>
-            </StackPanel>
+                </ScrollViewer.Background>
+                <ScrollViewer.Resources>
+                    <s:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">5</s:Double>
+                </ScrollViewer.Resources>
+                <StackPanel x:Name="InstanceStackPanel" />
+            </ScrollViewer>
         </Popup>
         <Button x:Name="Button" BorderThickness="0" Click="Button_Click" Width="50">
             <Button.Template>
diff --git a/SafeExamBrowser.UserInterface/Controls/ApplicationButton.xaml.cs b/SafeExamBrowser.UserInterface/Controls/ApplicationButton.xaml.cs
index 5803c6a6..cfbf832c 100644
--- a/SafeExamBrowser.UserInterface/Controls/ApplicationButton.xaml.cs
+++ b/SafeExamBrowser.UserInterface/Controls/ApplicationButton.xaml.cs
@@ -8,6 +8,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using SafeExamBrowser.Contracts.Configuration;
@@ -38,11 +39,6 @@ namespace SafeExamBrowser.UserInterface.Controls
 			instances.Add(instance);
 			instanceButton.Click += (id) => OnClick?.Invoke(id);
 			InstanceStackPanel.Children.Add(instanceButton);
-
-			if (instances.Count > 1)
-			{
-				InstancePopup.IsOpen = true;
-			}
 		}
 
 		public void UnregisterInstance(Guid id)
@@ -57,13 +53,20 @@ namespace SafeExamBrowser.UserInterface.Controls
 			Button.Content = ApplicationIconResourceLoader.Load(info.IconResource);
 
 			InstancePopup.MouseLeave += (o, args) => InstancePopup.IsOpen = false;
+			InstanceStackPanel.SizeChanged += (o, args) =>
+			{
+				if (instances.Count > 9)
+				{
+					InstanceScrollViewer.MaxHeight = InstanceScrollViewer.ActualHeight;
+				}
+			};
 		}
 
 		private void Button_Click(object sender, RoutedEventArgs e)
 		{
 			if (instances.Count <= 1)
 			{
-				OnClick?.Invoke();
+				OnClick?.Invoke(instances.FirstOrDefault()?.Id);
 			}
 			else
 			{
diff --git a/SafeExamBrowser.UserInterface/Controls/ApplicationInstanceButton.xaml.cs b/SafeExamBrowser.UserInterface/Controls/ApplicationInstanceButton.xaml.cs
index ae56e892..4fead73a 100644
--- a/SafeExamBrowser.UserInterface/Controls/ApplicationInstanceButton.xaml.cs
+++ b/SafeExamBrowser.UserInterface/Controls/ApplicationInstanceButton.xaml.cs
@@ -39,7 +39,7 @@ namespace SafeExamBrowser.UserInterface.Controls
 			panel.Children.Add(ApplicationIconResourceLoader.Load(info.IconResource));
 			panel.Children.Add(new TextBlock { Text = instance.Name, Foreground = Brushes.White, Padding = new Thickness(5, 0, 5, 0) });
 
-			Button.ToolTip = info.Tooltip;
+			Button.ToolTip = $"{instance.Name} - {info.Tooltip}";
 			Button.Content = panel;
 		}
 
diff --git a/SafeExamBrowser.UserInterface/Taskbar.xaml b/SafeExamBrowser.UserInterface/Taskbar.xaml
index afd87abe..9026327a 100644
--- a/SafeExamBrowser.UserInterface/Taskbar.xaml
+++ b/SafeExamBrowser.UserInterface/Taskbar.xaml
@@ -4,6 +4,7 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:SafeExamBrowser.UserInterface.Controls"
+        xmlns:s="clr-namespace:System;assembly=mscorlib"
         mc:Ignorable="d"
         Title="Taskbar" Height="40" Width="750" WindowStyle="None" AllowsTransparency="True" Topmost="True" Icon="./Images/Icon.ico">
     <Window.Background>
@@ -16,7 +17,12 @@
             <ColumnDefinition Width="75" />
             <ColumnDefinition Width="40" />
         </Grid.ColumnDefinitions>
-        <StackPanel x:Name="ApplicationAreaStackPanel" Orientation="Horizontal" />
+        <ScrollViewer Grid.Column="0" x:Name="ApplicationScrollViewer" VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Auto" PreviewMouseWheel="ApplicationScrollViewer_PreviewMouseWheel">
+            <ScrollViewer.Resources>
+                <s:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">5</s:Double>
+            </ScrollViewer.Resources>
+            <StackPanel x:Name="ApplicationStackPanel" Orientation="Horizontal" />
+        </ScrollViewer>
         <local:DateTimeControl Grid.Column="2" />
     </Grid>
 </Window>
diff --git a/SafeExamBrowser.UserInterface/Taskbar.xaml.cs b/SafeExamBrowser.UserInterface/Taskbar.xaml.cs
index 710c8760..b0da237a 100644
--- a/SafeExamBrowser.UserInterface/Taskbar.xaml.cs
+++ b/SafeExamBrowser.UserInterface/Taskbar.xaml.cs
@@ -22,7 +22,7 @@ namespace SafeExamBrowser.UserInterface
 		{
 			if (button is UIElement)
 			{
-				ApplicationAreaStackPanel.Children.Add(button as UIElement);
+				ApplicationStackPanel.Children.Add(button as UIElement);
 			}
 		}
 
@@ -37,5 +37,36 @@ namespace SafeExamBrowser.UserInterface
 			Width = width;
 			Height = height;
 		}
+
+		private void ApplicationScrollViewer_PreviewMouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
+		{
+			var scrollAmount = 20;
+
+			if (ApplicationScrollViewer.IsMouseOver)
+			{
+				if (e.Delta < 0)
+				{
+					if (ApplicationScrollViewer.HorizontalOffset + scrollAmount > 0)
+					{
+						ApplicationScrollViewer.ScrollToHorizontalOffset(ApplicationScrollViewer.HorizontalOffset + scrollAmount);
+					}
+					else
+					{
+						ApplicationScrollViewer.ScrollToLeftEnd();
+					}
+				}
+				else
+				{
+					if (ApplicationScrollViewer.ExtentWidth > ApplicationScrollViewer.HorizontalOffset - scrollAmount)
+					{
+						ApplicationScrollViewer.ScrollToHorizontalOffset(ApplicationScrollViewer.HorizontalOffset - scrollAmount);
+					}
+					else
+					{
+						ApplicationScrollViewer.ScrollToRightEnd();
+					}
+				}
+			}
+		}
 	}
 }
diff --git a/SafeExamBrowser/App.cs b/SafeExamBrowser/App.cs
index 8550bb76..99fd1492 100644
--- a/SafeExamBrowser/App.cs
+++ b/SafeExamBrowser/App.cs
@@ -62,25 +62,6 @@ namespace SafeExamBrowser
 			base.OnExit(e);
 		}
 
-		private void InitializeApplication()
-		{
-			instances.BuildObjectGraph();
-
-			var success = instances.StartupController.TryInitializeApplication();
-
-			if (success)
-			{
-				MainWindow = instances.Taskbar;
-				MainWindow.Show();
-			}
-			else
-			{
-				Shutdown();
-			}
-
-			instances.SplashScreen?.Dispatcher.InvokeAsync(instances.SplashScreen.Close);
-		}
-
 		private void ShowSplashScreen()
 		{
 			instances.BuildModulesRequiredBySplashScreen();
@@ -104,5 +85,24 @@ namespace SafeExamBrowser
 
 			splashReadyEvent.WaitOne();
 		}
+
+		private void InitializeApplication()
+		{
+			instances.BuildObjectGraph();
+
+			var success = instances.StartupController.TryInitializeApplication();
+
+			if (success)
+			{
+				MainWindow = instances.Taskbar;
+				MainWindow.Show();
+			}
+			else
+			{
+				Shutdown();
+			}
+
+			instances.SplashScreen?.Dispatcher.InvokeAsync(instances.SplashScreen.Close);
+		}
 	}
 }