From 0ec1a446f8e1eb749168d7df778fb5ae610e76bf Mon Sep 17 00:00:00 2001
From: dbuechel <damian.buechel@let.ethz.ch>
Date: Tue, 21 Jan 2020 08:48:03 +0100
Subject: [PATCH] SEBWIN-308: Implemented file system dialog for mobile UI.

---
 .../FileSystemDialog.xaml                     |   2 +-
 .../FileSystemDialog.xaml.cs                  |  19 +-
 .../FileSystemDialog.xaml                     |  45 +++
 .../FileSystemDialog.xaml.cs                  | 381 ++++++++++++++++++
 ...afeExamBrowser.UserInterface.Mobile.csproj |   7 +
 .../UserInterfaceFactory.cs                   |   4 +-
 6 files changed, 445 insertions(+), 13 deletions(-)
 create mode 100644 SafeExamBrowser.UserInterface.Mobile/FileSystemDialog.xaml
 create mode 100644 SafeExamBrowser.UserInterface.Mobile/FileSystemDialog.xaml.cs

diff --git a/SafeExamBrowser.UserInterface.Desktop/FileSystemDialog.xaml b/SafeExamBrowser.UserInterface.Desktop/FileSystemDialog.xaml
index 2875f176..13fad6cc 100644
--- a/SafeExamBrowser.UserInterface.Desktop/FileSystemDialog.xaml
+++ b/SafeExamBrowser.UserInterface.Desktop/FileSystemDialog.xaml
@@ -38,7 +38,7 @@
         <Grid Grid.Row="4" Background="{StaticResource BackgroundBrush}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
             <WrapPanel Orientation="Horizontal" Margin="20" HorizontalAlignment="Right" VerticalAlignment="Center">
                 <Button Name="SelectButton" Cursor="Hand" IsEnabled="False" Margin="10,0" Padding="10,5" MinWidth="75" />
-                <Button Name="CancelButton" Cursor="Hand" Padding="20,5" MinWidth="75" />
+                <Button Name="CancelButton" Cursor="Hand" Padding="10,5" MinWidth="75" />
             </WrapPanel>
         </Grid>
     </Grid>
diff --git a/SafeExamBrowser.UserInterface.Desktop/FileSystemDialog.xaml.cs b/SafeExamBrowser.UserInterface.Desktop/FileSystemDialog.xaml.cs
index d3d0f3d2..d4dba374 100644
--- a/SafeExamBrowser.UserInterface.Desktop/FileSystemDialog.xaml.cs
+++ b/SafeExamBrowser.UserInterface.Desktop/FileSystemDialog.xaml.cs
@@ -172,7 +172,7 @@ namespace SafeExamBrowser.UserInterface.Desktop
 
 			if (item.Tag is DirectoryInfo directory)
 			{
-				FileSystem.Cursor = Cursors.Wait;
+				item.Cursor = Cursors.Wait;
 				item.BeginInit();
 
 				try
@@ -199,7 +199,7 @@ namespace SafeExamBrowser.UserInterface.Desktop
 				}
 
 				item.EndInit();
-				FileSystem.Cursor = Cursors.Arrow;
+				item.Cursor = Cursors.Hand;
 			}
 		}
 
@@ -299,14 +299,13 @@ namespace SafeExamBrowser.UserInterface.Desktop
 
 			if (!string.IsNullOrEmpty(initialPath))
 			{
-				var pathRoot = Path.GetPathRoot(initialPath);
-				var directories = initialPath.Replace(pathRoot, "").Split(Path.DirectorySeparatorChar);
-				var segments = new List<string>();
+				var root = Path.GetPathRoot(initialPath);
+				var path = initialPath.Replace(root, "").Split(Path.DirectorySeparatorChar);
+				var segments = new List<string> { root };
 
-				segments.Add(pathRoot);
-				segments.AddRange(directories);
+				segments.AddRange(path);
 
-				AutoSelect(FileSystem.Items, segments);
+				SelectInitialPath(FileSystem.Items, segments);
 
 				if (element == FileSystemElement.File && operation == FileSystemOperation.Save)
 				{
@@ -315,7 +314,7 @@ namespace SafeExamBrowser.UserInterface.Desktop
 			}
 		}
 
-		private void AutoSelect(ItemCollection items, List<string> segments)
+		private void SelectInitialPath(ItemCollection items, List<string> segments)
 		{
 			var segment = segments.FirstOrDefault();
 
@@ -329,7 +328,7 @@ namespace SafeExamBrowser.UserInterface.Desktop
 						i.IsSelected = true;
 						i.BringIntoView();
 
-						AutoSelect(i.Items, segments.Skip(1).ToList());
+						SelectInitialPath(i.Items, segments.Skip(1).ToList());
 
 						break;
 					}
diff --git a/SafeExamBrowser.UserInterface.Mobile/FileSystemDialog.xaml b/SafeExamBrowser.UserInterface.Mobile/FileSystemDialog.xaml
new file mode 100644
index 00000000..fa5741db
--- /dev/null
+++ b/SafeExamBrowser.UserInterface.Mobile/FileSystemDialog.xaml
@@ -0,0 +1,45 @@
+<Window x:Class="SafeExamBrowser.UserInterface.Mobile.FileSystemDialog"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:fa="http://schemas.fontawesome.io/icons/"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:SafeExamBrowser.UserInterface.Mobile"
+        mc:Ignorable="d" Height="750" Width="750" FontSize="16" ResizeMode="NoResize" Topmost="True" WindowState="Maximized">
+    <Window.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="./Templates/Colors.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Window.Resources>
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+        <WrapPanel Grid.Row="0" Margin="25,10">
+            <fa:ImageAwesome Name="OperationIcon" Foreground="LightGray" Height="35" Icon="FileOutline"/>
+            <TextBlock Name="Message" Margin="10,0,0,0" VerticalAlignment="Center" />
+        </WrapPanel>
+        <TreeView Grid.Row="1" Name="FileSystem" Margin="10,0" TreeViewItem.Expanded="FileSystem_Expanded" />
+        <TextBlock Grid.Row="2" Name="SelectedElement" Margin="10,5,10,5" Padding="0,8" TextTrimming="CharacterEllipsis" VerticalAlignment="Center" />
+        <Grid Grid.Row="3" Name="NewElement" Margin="10,0,10,10">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto" />
+                <ColumnDefinition Width="*" />
+            </Grid.ColumnDefinitions>
+            <TextBlock Grid.Column="0" Name="NewElementLabel" VerticalAlignment="Center"/>
+            <TextBox Grid.Column="1" Name="NewElementName" Margin="5,0,0,0" Padding="8" VerticalContentAlignment="Center" />
+        </Grid>
+        <Grid Grid.Row="4" Background="{StaticResource BackgroundBrush}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
+            <WrapPanel Orientation="Horizontal" Margin="25" HorizontalAlignment="Right" VerticalAlignment="Center">
+                <Button Name="SelectButton" Cursor="Hand" IsEnabled="False" Margin="20,0" Padding="20,10" MinWidth="75" />
+                <Button Name="CancelButton" Cursor="Hand" Padding="20,10" MinWidth="75" />
+            </WrapPanel>
+        </Grid>
+    </Grid>
+</Window>
diff --git a/SafeExamBrowser.UserInterface.Mobile/FileSystemDialog.xaml.cs b/SafeExamBrowser.UserInterface.Mobile/FileSystemDialog.xaml.cs
new file mode 100644
index 00000000..5c821567
--- /dev/null
+++ b/SafeExamBrowser.UserInterface.Mobile/FileSystemDialog.xaml.cs
@@ -0,0 +1,381 @@
+/*
+ * Copyright (c) 2020 ETH Zürich, Educational Development and Technology (LET)
+ * 
+ * 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.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Media;
+using FontAwesome.WPF;
+using SafeExamBrowser.I18n.Contracts;
+using SafeExamBrowser.UserInterface.Contracts.FileSystemDialog;
+using SafeExamBrowser.UserInterface.Contracts.Windows;
+using SafeExamBrowser.UserInterface.Shared.Utilities;
+
+namespace SafeExamBrowser.UserInterface.Mobile
+{
+	public partial class FileSystemDialog : Window, IFileSystemDialog
+	{
+		private FileSystemElement element;
+		private string initialPath;
+		private string message;
+		private FileSystemOperation operation;
+		private IText text;
+		private string title;
+
+		public FileSystemDialog(
+			FileSystemElement element,
+			string initialPath,
+			FileSystemOperation operation,
+			IText text,
+			string message = default(string),
+			string title = default(string))
+		{
+			this.element = element;
+			this.initialPath = initialPath;
+			this.message = message;
+			this.operation = operation;
+			this.text = text;
+			this.title = title;
+
+			InitializeComponent();
+			InitializeDialog();
+		}
+
+		public FileSystemDialogResult Show(IWindow parent = null)
+		{
+			return Dispatcher.Invoke(() =>
+			{
+				var result = new FileSystemDialogResult();
+
+				if (parent is Window)
+				{
+					Owner = parent as Window;
+					WindowStartupLocation = WindowStartupLocation.CenterOwner;
+				}
+
+				if (ShowDialog() == true)
+				{
+					result.FullPath = BuildFullPath();
+					result.Success = true;
+				}
+
+				return result;
+			});
+		}
+
+		private void CancelButton_Click(object sender, RoutedEventArgs e)
+		{
+			DialogResult = false;
+			Close();
+		}
+
+		private void FileSystem_Expanded(object sender, RoutedEventArgs e)
+		{
+			if (e.Source is TreeViewItem item && item.Items.Count == 1 && !(item.Items[0] is TreeViewItem))
+			{
+				Load(item);
+			}
+		}
+
+		private void FileSystem_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
+		{
+			if (e.NewValue is TreeViewItem item)
+			{
+				if (item.Tag is DirectoryInfo directory)
+				{
+					SelectButton.IsEnabled = element == FileSystemElement.Folder || operation == FileSystemOperation.Save;
+					SelectedElement.Text = directory.FullName;
+					SelectedElement.ToolTip = directory.FullName;
+				}
+				else if (item.Tag is FileInfo file)
+				{
+					SelectButton.IsEnabled = element == FileSystemElement.File;
+					SelectedElement.Text = file.FullName;
+					SelectedElement.ToolTip = file.FullName;
+				}
+				else
+				{
+					SelectButton.IsEnabled = false;
+				}
+			}
+		}
+
+		private void NewElementName_KeyUp(object sender, KeyEventArgs e)
+		{
+			if (e.Key == Key.Enter && IsValid())
+			{
+				DialogResult = true;
+				Close();
+			}
+		}
+
+		private void SelectButton_Click(object sender, RoutedEventArgs e)
+		{
+			if (IsValid())
+			{
+				DialogResult = true;
+				Close();
+			}
+		}
+
+		private string BuildFullPath()
+		{
+			var fullPath = SelectedElement.Text;
+
+			if (operation == FileSystemOperation.Save)
+			{
+				fullPath = Path.Combine(SelectedElement.Text, NewElementName.Text);
+
+				if (element == FileSystemElement.File)
+				{
+					var extension = Path.GetExtension(initialPath);
+
+					if (!fullPath.EndsWith(extension))
+					{
+						fullPath = $"{fullPath}{extension}";
+					}
+				}
+			}
+
+			return fullPath;
+		}
+
+		private bool IsValid()
+		{
+			var fullPath = BuildFullPath();
+			var isValid = true;
+
+			if (element == FileSystemElement.File && operation == FileSystemOperation.Save && File.Exists(fullPath))
+			{
+				var message = text.Get(TextKey.FileSystemDialog_OverwriteWarning);
+				var title = text.Get(TextKey.FileSystemDialog_OverwriteWarningTitle);
+				var result = System.Windows.MessageBox.Show(this, message, title, MessageBoxButton.YesNo, MessageBoxImage.Warning);
+
+				isValid = result == MessageBoxResult.Yes;
+			}
+
+			return isValid;
+		}
+
+		private void Load(TreeViewItem item)
+		{
+			item.Items.Clear();
+
+			if (item.Tag is DirectoryInfo directory)
+			{
+				item.Cursor = Cursors.Wait;
+				item.BeginInit();
+
+				try
+				{
+					foreach (var subDirectory in directory.GetDirectories())
+					{
+						if (!subDirectory.Attributes.HasFlag(FileAttributes.Hidden))
+						{
+							item.Items.Add(CreateItem(subDirectory));
+						}
+					}
+
+					foreach (var file in directory.GetFiles())
+					{
+						if (!file.Attributes.HasFlag(FileAttributes.Hidden))
+						{
+							item.Items.Add(CreateItem(file));
+						}
+					}
+				}
+				catch (Exception e)
+				{
+					item.Items.Add(CreateErrorItem(e));
+				}
+
+				item.EndInit();
+				item.Cursor = Cursors.Hand;
+			}
+		}
+
+		private TreeViewItem CreateErrorItem(Exception e)
+		{
+			var item = new TreeViewItem();
+
+			item.Foreground = Brushes.Red;
+			item.Header = $"{text.Get(TextKey.FileSystemDialog_LoadError)} {e.Message}";
+			item.ToolTip = e.GetType() + Environment.NewLine + e.StackTrace;
+
+			return item;
+		}
+
+		private TreeViewItem CreateItem(DirectoryInfo directory)
+		{
+			var header = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(2) };
+			var image = new Image
+			{
+				Height = 24,
+				Source = IconLoader.LoadIconFor(directory)
+			};
+			var item = new TreeViewItem();
+			var textBlock = new TextBlock { Margin = new Thickness(5, 0, 0, 0), Text = directory.Name, VerticalAlignment = VerticalAlignment.Center };
+
+			header.Children.Add(image);
+			header.Children.Add(textBlock);
+
+			item.Cursor = Cursors.Hand;
+			item.Header = header;
+			item.Tag = directory;
+			item.ToolTip = directory.FullName;
+			item.Items.Add(text.Get(TextKey.FileSystemDialog_Loading));
+
+			return item;
+		}
+
+		private TreeViewItem CreateItem(FileInfo file)
+		{
+			var header = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(2) };
+			var image = new Image
+			{
+				Height = 24,
+				Source = IconLoader.LoadIconFor(file)
+			};
+			var item = new TreeViewItem();
+			var textBlock = new TextBlock { Margin = new Thickness(5, 0, 0, 0), Text = file.Name, VerticalAlignment = VerticalAlignment.Center };
+
+			header.Children.Add(image);
+			header.Children.Add(textBlock);
+
+			item.Header = header;
+			item.Tag = file;
+			item.ToolTip = file.FullName;
+
+			if (element == FileSystemElement.File && operation == FileSystemOperation.Open)
+			{
+				item.Cursor = Cursors.Hand;
+			}
+			else
+			{
+				item.Cursor = Cursors.No;
+				item.Focusable = false;
+				textBlock.Foreground = Brushes.Gray;
+			}
+
+			return item;
+		}
+
+		private void InitializeDialog()
+		{
+			CancelButton.Click += CancelButton_Click;
+			CancelButton.Content = text.Get(TextKey.FileSystemDialog_Cancel);
+			FileSystem.SelectedItemChanged += FileSystem_SelectedItemChanged;
+			NewElement.Visibility = operation == FileSystemOperation.Save ? Visibility.Visible : Visibility.Collapsed;
+			NewElementLabel.Text = text.Get(TextKey.FileSystemDialog_SaveAs);
+			NewElementName.KeyUp += NewElementName_KeyUp;
+			OperationIcon.Icon = operation == FileSystemOperation.Save ? FontAwesomeIcon.Download : FontAwesomeIcon.Search;
+			SelectButton.Click += SelectButton_Click;
+			SelectButton.Content = text.Get(TextKey.FileSystemDialog_Select);
+
+			InitializeText();
+			InitializeFileSystem();
+		}
+
+		private void InitializeFileSystem()
+		{
+			foreach (var drive in DriveInfo.GetDrives())
+			{
+				FileSystem.Items.Add(CreateItem(drive.RootDirectory));
+			}
+
+			if (FileSystem.HasItems && FileSystem.Items[0] is TreeViewItem item)
+			{
+				item.IsSelected = true;
+			}
+
+			if (!string.IsNullOrEmpty(initialPath))
+			{
+				var root = Path.GetPathRoot(initialPath);
+				var path = initialPath.Replace(root, "").Split(Path.DirectorySeparatorChar);
+				var segments = new List<string> { root };
+
+				segments.AddRange(path);
+
+				SelectInitialPath(FileSystem.Items, segments);
+
+				if (element == FileSystemElement.File && operation == FileSystemOperation.Save)
+				{
+					NewElementName.Text = Path.GetFileName(initialPath);
+				}
+			}
+		}
+
+		private void SelectInitialPath(ItemCollection items, List<string> segments)
+		{
+			var segment = segments.FirstOrDefault();
+
+			if (segment != default(string))
+			{
+				foreach (var item in items)
+				{
+					if (item is TreeViewItem i && i.Tag is DirectoryInfo d && d.Name.Equals(segment))
+					{
+						i.IsExpanded = true;
+						i.IsSelected = true;
+						i.BringIntoView();
+
+						SelectInitialPath(i.Items, segments.Skip(1).ToList());
+
+						break;
+					}
+				}
+			}
+		}
+
+		private void InitializeText()
+		{
+			if (string.IsNullOrEmpty(message))
+			{
+				if (element == FileSystemElement.File)
+				{
+					if (operation == FileSystemOperation.Open)
+					{
+						Message.Text = text.Get(TextKey.FileSystemDialog_OpenFileMessage);
+					}
+					else
+					{
+						Message.Text = text.Get(TextKey.FileSystemDialog_SaveFileMessage);
+					}
+				}
+				else
+				{
+					if (operation == FileSystemOperation.Open)
+					{
+						Message.Text = text.Get(TextKey.FileSystemDialog_OpenFolderMessage);
+					}
+					else
+					{
+						Message.Text = text.Get(TextKey.FileSystemDialog_SaveFolderMessage);
+					}
+				}
+			}
+			else
+			{
+				Message.Text = message;
+			}
+
+			if (string.IsNullOrEmpty(title))
+			{
+				Title = text.Get(TextKey.FileSystemDialog_Title);
+			}
+			else
+			{
+				Title = title;
+			}
+		}
+	}
+}
diff --git a/SafeExamBrowser.UserInterface.Mobile/SafeExamBrowser.UserInterface.Mobile.csproj b/SafeExamBrowser.UserInterface.Mobile/SafeExamBrowser.UserInterface.Mobile.csproj
index 0fd5e3be..d7538c74 100644
--- a/SafeExamBrowser.UserInterface.Mobile/SafeExamBrowser.UserInterface.Mobile.csproj
+++ b/SafeExamBrowser.UserInterface.Mobile/SafeExamBrowser.UserInterface.Mobile.csproj
@@ -146,6 +146,9 @@
     <Compile Include="Controls\TaskviewWindowControl.xaml.cs">
       <DependentUpon>TaskviewWindowControl.xaml</DependentUpon>
     </Compile>
+    <Compile Include="FileSystemDialog.xaml.cs">
+      <DependentUpon>FileSystemDialog.xaml</DependentUpon>
+    </Compile>
     <Compile Include="FolderDialog.cs" />
     <Compile Include="LockScreen.xaml.cs">
       <DependentUpon>LockScreen.xaml</DependentUpon>
@@ -360,6 +363,10 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </Page>
+    <Page Include="FileSystemDialog.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="Images\ZoomPageOut.xaml">
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
diff --git a/SafeExamBrowser.UserInterface.Mobile/UserInterfaceFactory.cs b/SafeExamBrowser.UserInterface.Mobile/UserInterfaceFactory.cs
index ede4d050..71aced62 100644
--- a/SafeExamBrowser.UserInterface.Mobile/UserInterfaceFactory.cs
+++ b/SafeExamBrowser.UserInterface.Mobile/UserInterfaceFactory.cs
@@ -73,12 +73,12 @@ namespace SafeExamBrowser.UserInterface.Mobile
 
 		public IBrowserWindow CreateBrowserWindow(IBrowserControl control, BrowserSettings settings, bool isMainWindow)
 		{
-			return new BrowserWindow(control, settings, isMainWindow, text);
+			return Application.Current.Dispatcher.Invoke(() => new BrowserWindow(control, settings, isMainWindow, text));
 		}
 
 		public IFileSystemDialog CreateFileSystemDialog(FileSystemElement element, string initialPath, FileSystemOperation operation, string message = default(string), string title = default(string))
 		{
-			throw new System.NotImplementedException();
+			return Application.Current.Dispatcher.Invoke(() => new FileSystemDialog(element, initialPath, operation, text, message, title));
 		}
 
 		public IFolderDialog CreateFolderDialog(string message)