[feat:] first project version

2024-12-23 23:03:20 +01:00
parent 8c56577de0
commit 54d25ac155
8 changed files with 705 additions and 8 deletions
--- a/App.axaml
+++ b/App.axaml
@@ -7,4 +7,8 @@
    <Application.Styles>
        <FluentTheme />
    </Application.Styles>
+    <Application.Resources>
+        <x:Double x:Key="DatePickerThemeMinWidth">10</x:Double> 
+        <x:Double x:Key="DatePickerThemeMaxWidth">1000</x:Double> 
+    </Application.Resources>
 </Application>
--- a/Backup.cs
+++ b/Backup.cs
@@ -0,0 +1,7 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+
--- a/Exam.cs
+++ b/Exam.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+
+namespace PLG_Exam
+{
+    public class Exam
+    {
+        public string Name { get; set; } = string.Empty;
+        public string Vorname { get; set; } = string.Empty;
+        public DateTime? Datum { get; set; }
+        public List<ExamTab> Tabs { get; set; } = new();
+    }
+
+    public class ExamTab
+    {
+        public string Aufgabennummer { get; set; } = string.Empty;
+        public string Überschrift { get; set; } = string.Empty;
+        public string Inhalt { get; set; } = string.Empty;
+    }
+}
--- a/MainWindow.axaml
+++ b/MainWindow.axaml
@@ -4,6 +4,49 @@
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="PLG_Exam.MainWindow"
-        Title="PLG_Exam">
-    Welcome to Avalonia!
+        Title="PLG Exam">
+    <DockPanel Margin="10">
+        <!-- Unterer Teil: Dateiverwaltung -->
+        <Border DockPanel.Dock="Bottom" Background="#232327" Margin="0,10,0,0">
+            <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" Margin="10" VerticalAlignment="Center" Spacing="10">
+                <Button Content="Speichern" Click="OnSaveClick" />
+                <Button Content="Speichern unter..." Click="OnSaveAsClick" />
+                <Button Content="Öffnen" Click="OnOpenClick" />
+                <Button Content="Neu" Click="OnNewClick" />
+            </StackPanel>
+        </Border>
+
+        <!-- Oberer Teil: Name, Vorname, Datum -->
+        <Border DockPanel.Dock="Top" Background="#232327" Height="100" Margin="0,0,0,10">
+            <Grid Margin="10">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="350" />
+                </Grid.ColumnDefinitions>
+                <StackPanel Grid.Column="0" Margin="5" Spacing="5">
+                    <TextBlock Text="Name" FontWeight="Bold" Foreground="White" />
+                    <TextBox Name="NameField" Height="33"/>
+                </StackPanel>
+                <StackPanel Grid.Column="1" Margin="5" Spacing="5"> 
+                    <TextBlock Text="Vorname" FontWeight="Bold" Foreground="White" />
+                    <TextBox Name="VornameField" Height="33"/>
+                </StackPanel>
+                <StackPanel Grid.Column="2" Margin="5" Spacing="5">
+                    <TextBlock Text="Datum" HorizontalAlignment="Stretch" FontWeight="Bold" Foreground="White" />
+                    <DatePicker Name="DatumField" Width="340" Height="33" />
+                </StackPanel>
+            </Grid>
+        </Border>
+
+        <!-- Mittlerer Teil: Tabansicht -->
+        <Border Background="#232327" Margin="0,0,0,0">
+            <DockPanel>
+                <Button Content="Weitere Aufgabenlösung hinzufügen" DockPanel.Dock="Top" HorizontalAlignment="Center" Margin="10,10,10,0" Click="OnAddTabClick" />
+                <TabControl Name="TabView" Margin="10">
+                    
+                </TabControl>
+            </DockPanel>
+        </Border>
+    </DockPanel>
 </Window>
--- a/MainWindow.axaml.cs
+++ b/MainWindow.axaml.cs
@@ -1,11 +1,515 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+using System.Threading.Tasks;
+using System.Timers;
+using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Media;
+using Avalonia.Threading;

-namespace PLG_Exam;
-
-public partial class MainWindow : Window
+namespace PLG_Exam
 {
+    public partial class MainWindow : Window
+    {
+        private int _tabCounter = 0;
+        private bool _isSaved = true; 
+        private string? _currentFilePath;
+        public static Exam _currentExam = new();
+
        public MainWindow()
        {
            InitializeComponent();
+            InitializeBackupTimer();
+            AddNewTab();
+
+            this.KeyDown += OnKeyDown;
+        }
+
+        // Event für "Neuen Tab hinzufügen"
+        private void OnAddTabClick(object? sender, RoutedEventArgs e)
+        {
+            AddNewTab();
+        }
+
+        private async void OnKeyDown(object? sender, Avalonia.Input.KeyEventArgs e)
+        {
+            if (e.KeyModifiers.HasFlag(Avalonia.Input.KeyModifiers.Control))
+            {
+                switch (e.Key)
+                {
+                    case Avalonia.Input.Key.S:
+                        if (e.KeyModifiers.HasFlag(Avalonia.Input.KeyModifiers.Shift))
+                        {
+                            // Strg + Shift + S: Speichern Unter
+                            OnSaveAsClick(sender, e);
+                        }
+                        else
+                        {
+                            // Strg + S: Speichern
+                            OnSaveClick(sender, e);
+                        }
+                        break;
+
+                    case Avalonia.Input.Key.O:
+                        // Strg + O: Öffnen
+                        OnOpenClick(sender, e);
+                        break;
+
+                    case Avalonia.Input.Key.T:
+                        // Strg + T: Neuer Tab
+                        OnAddTabClick(sender, e);
+                        break;
+
+                    case Avalonia.Input.Key.N:
+                        // Strg + N: Neu
+                        OnNewClick(sender, e);
+                        break;
+
+                    case Avalonia.Input.Key.R:
+                        // Strg + R: Abgeben (coming soon)
+                        await OnSubmitClick(sender, e);
+                        break;
+                }
+            }
+        }
+
+        private async Task OnSubmitClick(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+        {
+            await MessageBox.Show(this, "Abgeben-Funktion wird bald verfügbar sein!", "Abgeben", MessageBoxButton.Ok);
+        }
+
+
+        private void AddNewTab()
+        {
+            _tabCounter++;
+
+            var closeButton = new Button
+            {
+                Content = "×",
+                FontSize = 14,
+                HorizontalContentAlignment = Avalonia.Layout.HorizontalAlignment.Center,
+                VerticalContentAlignment = Avalonia.Layout.VerticalAlignment.Center,
+                Width = 20,
+                Height = 20,
+                Background = new SolidColorBrush(Color.FromRgb(123,35,39)),
+                Foreground = new SolidColorBrush(Color.FromRgb(0,0,0)),
+                Padding = new Thickness(0),
+                Margin = new Thickness(5, 0, 0, 0),
+                VerticalAlignment = Avalonia.Layout.VerticalAlignment.Center
+            };
+
+            ToolTip.SetTip(closeButton, "Tab schließen");
+
+            var headerStackPanel = new StackPanel
+            {
+                Orientation = Avalonia.Layout.Orientation.Horizontal
+            };
+
+            var tabHeader = new TextBlock
+            {
+                Text = $"{_tabCounter} - Neu",
+                VerticalAlignment = Avalonia.Layout.VerticalAlignment.Center
+            };
+
+            headerStackPanel.Children.Add(tabHeader);
+            headerStackPanel.Children.Add(closeButton);
+
+            var tabItem = new TabItem
+            {
+                Header = headerStackPanel,
+                Content = CreateTabContent()
+            };
+
+            // Schließen-Event hinzufügen
+            closeButton.Click += async (sender, e) =>
+            {
+                var result = await MessageBox.Show(this, "Diese Aktion schließt die Aufgabe unwiderruflich. Möchten Sie fortfahren?", 
+                                                "Tab schließen", MessageBoxButton.YesNo);
+                if (result == MessageBoxResult.Yes)
+                {
+                    TabView.Items.Remove(tabItem);
+                    _isSaved = false;
+                }
+            };
+
+            TabView.Items.Add(tabItem);
+            TabView.SelectedItem = tabItem;
+            _isSaved = false;
+        }
+
+
+        // Tab entfernen mit Sicherheitsabfrage
+        private async void OnRemoveTabClick(object? sender, RoutedEventArgs e)
+        {
+            if (TabView.SelectedItem is TabItem selectedTab)
+            {
+                var result = await MessageBox.Show(this, "Dieser Tab wird unwiderruflich gelöscht. Möchten Sie fortfahren?", 
+                                                   "Tab löschen", MessageBoxButton.YesNo);
+                if (result == MessageBoxResult.Yes)
+                {
+                    TabView.Items.Remove(selectedTab);
+                    _isSaved = false;
+                }
+            }
+        }
+
+        // Speichern
+        private async void OnSaveClick(object? sender, RoutedEventArgs e)
+        {
+            if (string.IsNullOrEmpty(_currentFilePath))
+            {
+                await SaveAs();
+            }
+            else
+            {
+                SaveToFile(_currentFilePath);
+            }
+        }
+
+        private async void OnSaveAsClick(object? sender, RoutedEventArgs e)
+        {
+            await SaveAs();
+        }
+
+        private async Task<bool> SaveAs()
+        {
+            var saveDialog = new SaveFileDialog
+            {
+                DefaultExtension = "exam",
+                Filters = { new FileDialogFilter { Name = "Exam files", Extensions = { "exam" } } }
+            };
+            var filePath = await saveDialog.ShowAsync(this);
+
+            if (!string.IsNullOrEmpty(filePath))
+            {
+                SaveToFile(filePath);
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        private void SaveToFile(string filePath)
+        {
+            // Update Exam-Daten
+            _currentExam.Name = NameField.Text;
+            _currentExam.Vorname = VornameField.Text;
+            _currentExam.Datum = DatumField.SelectedDate?.UtcDateTime;
+            _currentExam.Tabs = TabView.Items.OfType<TabItem>()
+                .Select(tab =>
+                {
+                    var grid = tab.Content as Grid;
+                    if (grid == null) return null;
+
+                    var aufgabennummer = (grid.Children[0] as Grid)?.Children[0] as TextBox;
+                    var ueberschrift = (grid.Children[0] as Grid)?.Children[1] as TextBox;
+                    var beschreibung = grid.Children[1] as TextBox;
+
+                    return new ExamTab
+                    {
+                        Aufgabennummer = aufgabennummer?.Text ?? "",
+                        Überschrift = ueberschrift?.Text ?? "",
+                        Inhalt = beschreibung?.Text ?? ""
+                    };
+                })
+                .Where(tab => tab != null)
+                .ToList();
+
+            var json = JsonSerializer.Serialize(_currentExam, new JsonSerializerOptions { WriteIndented = true });
+            File.WriteAllText(filePath, json);
+
+            _currentFilePath = filePath;
+            _isSaved = true;
+        }
+
+        // Öffnen
+        private async void OnOpenClick(object? sender, RoutedEventArgs e)
+        {
+            var openDialog = new OpenFileDialog
+            {
+                AllowMultiple = false,
+                Filters = { new FileDialogFilter { Name = "Exam files", Extensions = { "exam" } } }
+            };
+            var result = await openDialog.ShowAsync(this);
+
+            if (result != null && result.Length > 0)
+            {
+                LoadFromFile(result[0]);
+            }
+        }
+
+        private void LoadFromFile(string filePath)
+        {
+            var fileContent = File.ReadAllText(filePath);
+            var exam = JsonSerializer.Deserialize<Exam>(fileContent);
+
+            if (exam == null) return;
+
+            // Daten wiederherstellen
+            _currentExam = exam;
+            NameField.Text = exam.Name;
+            VornameField.Text = exam.Vorname;
+            DatumField.SelectedDate = exam.Datum;
+
+            TabView.Items.Clear();
+            _tabCounter = 0;
+
+            foreach (var tab in exam.Tabs)
+            {
+                _tabCounter++;
+                var tabItem = new TabItem
+                {
+                    Header = $"{tab.Aufgabennummer} - {tab.Überschrift}",
+                    Content = CreateTabContent(tab.Aufgabennummer, tab.Überschrift, tab.Inhalt)
+                };
+                TabView.Items.Add(tabItem);
+            }
+
+            _currentFilePath = filePath;
+            _isSaved = true;
+        }
+
+        // Neu
+        private async void OnNewClick(object? sender, RoutedEventArgs e)
+        {
+            if (!_isSaved)
+            {
+                var result = await MessageBox.Show(this, "Möchten Sie die aktuellen Änderungen speichern?", 
+                                                   "Nicht gespeicherte Änderungen", MessageBoxButton.YesNoCancel);
+                if (result == MessageBoxResult.Cancel) return;
+                if (result == MessageBoxResult.Yes) {
+                    if((await SaveAs()) != true){
+                        return;
+                    }
+                }
+            }
+
+            _currentExam = new Exam();
+            NameField.Text = "";
+            VornameField.Text = "";
+            DatumField.SelectedDate = null;
+            TabView.Items.Clear();
+            _tabCounter = 0;
+            _currentFilePath = null;
+            _isSaved = true;
+        }
+
+        private Grid CreateTabContent(string? aufgabennummer = null, string? ueberschrift = null, string? beschreibung = null)
+        {
+            var grid = new Grid();
+            grid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(33) });
+            grid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
+
+            var headerGrid = new Grid { Margin = new Thickness(0, 0, 0, 10) };
+            headerGrid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(250) });
+            headerGrid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
+
+            var aufgabenNummerTextBox = new TextBox
+            {
+                Name = "Aufgabennummer",
+                Watermark = "Aufgabennummer",
+                Margin = new Thickness(0,10,0,0),
+                Text = aufgabennummer ?? ""
+            };
+
+            var ueberschriftTextBox = new TextBox
+            {
+                Name = "Überschrift",
+                Watermark = "Überschrift (optional)",
+                Margin = new Thickness(10,10,0,0),
+                Text = ueberschrift ?? ""
+            };
+
+            var beschreibungTextBox = new TextBox
+            {
+                Name = "Beschreibung",
+                AcceptsReturn = true,
+                VerticalContentAlignment = Avalonia.Layout.VerticalAlignment.Stretch,
+                Watermark = "Beschreibung",
+                Text = beschreibung ?? "",
+            };
+
+            // Event für dynamische Tab-Umbenennung
+            aufgabenNummerTextBox.KeyUp += (s, e) => UpdateTabHeader(TabView.SelectedItem as TabItem, aufgabenNummerTextBox, ueberschriftTextBox);
+            ueberschriftTextBox.KeyUp += (s, e) => UpdateTabHeader(TabView.SelectedItem as TabItem, aufgabenNummerTextBox, ueberschriftTextBox);
+
+            headerGrid.Children.Add(aufgabenNummerTextBox);
+            headerGrid.Children.Add(ueberschriftTextBox);
+            Grid.SetColumn(aufgabenNummerTextBox, 0);
+            Grid.SetColumn(ueberschriftTextBox, 1);
+
+            grid.Children.Add(headerGrid);
+            grid.Children.Add(beschreibungTextBox);
+            Grid.SetRow(headerGrid, 0);
+            Grid.SetRow(beschreibungTextBox, 1);
+
+            return grid;
+        }
+
+        private void UpdateTabHeader(TabItem? tab, TextBox aufgabennummer, TextBox ueberschrift)
+        {
+            if (tab == null) return;
+
+            var aufgabeText = string.IsNullOrWhiteSpace(aufgabennummer.Text) ? "Neu" : aufgabennummer.Text;
+            var ueberschriftText = string.IsNullOrWhiteSpace(ueberschrift.Text) ? "" : ueberschrift.Text;
+
+            tab.Header = string.IsNullOrWhiteSpace(ueberschriftText)
+                ? aufgabeText
+                : $"{aufgabeText} - {ueberschriftText}";
+        }
+
+
+        //
+        // Backups
+        //
+
+        private const int BackupInterval = 20000; // 20 Sekunden in Millisekunden
+        
+
+        private DispatcherTimer _backupTimer;
+
+        private void InitializeBackupTimer()
+        {
+            _backupTimer = new DispatcherTimer
+            {
+                Interval = TimeSpan.FromSeconds(20)
+            };
+            _backupTimer.Tick += (sender, e) => CreateBackup();
+            _backupTimer.Start();
+        }
+
+        private const int MaxBackupFiles = 5; // Maximal 5 Backups
+        private readonly string BackupFolderPath = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), 
+            "PLG_Exam_Backup");
+
+        
+
+        // Backup erstellen
+        private void CreateBackup()
+        {
+            try
+            {
+                // Ordner erstellen, falls nicht vorhanden
+                if (!Directory.Exists(BackupFolderPath))
+                {
+                    Directory.CreateDirectory(BackupFolderPath);
+                }
+
+                // Erstelle Dateinamen mit Zeitstempel
+                var timestamp = DateTime.Now.ToString("yyMMdd_HHmmss");
+                var backupFileName = Path.Combine(BackupFolderPath, $"{timestamp}_backup.exam");
+
+                // Aktuelle Daten in JSON-Format speichern
+                var jsonData = GetCurrentExamDataAsJson();
+                File.WriteAllText(backupFileName, jsonData);
+
+                // Alte Backups löschen, wenn mehr als MaxBackupFiles vorhanden sind
+                CleanupOldBackups();
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Backup konnte nicht erstellt werden: {ex.Message}");
+            }
+        }
+
+        // Löscht alte Backups, wenn die maximale Anzahl überschritten wird
+        private void CleanupOldBackups()
+        {
+            var backupFiles = Directory.GetFiles(BackupFolderPath, "*_backup.exam")
+                .OrderBy(File.GetCreationTime)
+                .ToList();
+
+            while (backupFiles.Count > MaxBackupFiles)
+            {
+                var oldestFile = backupFiles.First();
+                File.Delete(oldestFile);
+                backupFiles.RemoveAt(0);
+            }
+        }
+
+        // Löscht alle Backups unwiderruflich (mit Überschreiben)
+        private void DeleteAllBackups()
+        {
+            try
+            {
+                if (Directory.Exists(BackupFolderPath))
+                {
+                    foreach (var file in Directory.GetFiles(BackupFolderPath, "*_backup.exam"))
+                    {
+                        OverwriteAndDeleteFile(file);
+                    }
+                    Directory.Delete(BackupFolderPath, true);
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Backups konnten nicht gelöscht werden: {ex.Message}");
+            }
+        }
+
+        // Überschreibt eine Datei mit Zufallsdaten und löscht sie anschließend
+        private void OverwriteAndDeleteFile(string filePath)
+        {
+            try
+            {
+                if (!File.Exists(filePath)) return;
+
+                var fileLength = new FileInfo(filePath).Length;
+
+                // Datei mit Zufallsdaten überschreiben
+                using (var stream = new FileStream(filePath, FileMode.Open))
+                {
+                    var randomData = new byte[fileLength];
+                    new Random().NextBytes(randomData);
+                    stream.Write(randomData, 0, randomData.Length);
+                }
+
+                // Datei löschen
+                File.Delete(filePath);
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Datei konnte nicht überschrieben und gelöscht werden: {ex.Message}");
+            }
+        }
+
+        // Holt die aktuelle Exam-Daten als JSON
+        private string GetCurrentExamDataAsJson()
+        {
+            _currentExam.Name = NameField.Text;
+            _currentExam.Vorname = VornameField.Text;
+            _currentExam.Datum = DatumField.SelectedDate?.UtcDateTime;
+
+            _currentExam.Tabs = TabView.Items.OfType<TabItem>()
+                .Select(tab =>
+                {
+                    var grid = tab.Content as Grid;
+                    if (grid == null) return null;
+
+                    var aufgabennummer = (grid.Children[0] as Grid)?.Children[0] as TextBox;
+                    var ueberschrift = (grid.Children[0] as Grid)?.Children[1] as TextBox;
+                    var beschreibung = grid.Children[1] as TextBox;
+
+                    return new ExamTab
+                    {
+                        Aufgabennummer = aufgabennummer?.Text ?? "",
+                        Überschrift = ueberschrift?.Text ?? "",
+                        Inhalt = beschreibung?.Text ?? ""
+                    };
+                })
+                .Where(tab => tab != null)
+                .ToList();
+
+            return System.Text.Json.JsonSerializer.Serialize(_currentExam, new System.Text.Json.JsonSerializerOptions { WriteIndented = true });
+        }
+
+
+
+
    }
 }
--- a/MessageBox.axaml
+++ b/MessageBox.axaml
@@ -0,0 +1,18 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" SizeToContent="WidthAndHeight"
+        x:Class="PLG_Exam.MessageBox"
+        Title="MessageBox">
+<StackPanel>
+        <TextBlock Name="Text" Margin="10" TextWrapping="Wrap"/>
+        <StackPanel HorizontalAlignment="Right" Margin="5" Orientation="Horizontal" Name="Buttons">
+            <StackPanel.Styles>
+                <Style Selector="Button">
+                    <Setter Property="Margin" Value="5"/>
+                </Style>
+            </StackPanel.Styles>
+        </StackPanel>
+    </StackPanel>
+</Window>
--- a/MessageBox.axaml.cs
+++ b/MessageBox.axaml.cs
@@ -0,0 +1,76 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using System.Threading.Tasks;
+
+namespace PLG_Exam;
+
+public partial class MessageBox : Window
+{
+    public MessageBox()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public static Task<MessageBoxResult> Show(Window? parent, string text, string title, MessageBoxButton buttons = MessageBoxButton.Ok)
+    {
+        var msgbox = new MessageBox()
+        {
+            Title = title
+        };
+        var tb = msgbox.FindControl<TextBlock>("Text");
+        if(tb != null) tb.Text = text;
+        var buttonPanel = msgbox.FindControl<StackPanel>("Buttons");
+
+        var res = MessageBoxResult.Ok;
+
+        void AddButton(string caption, MessageBoxResult r, bool def = false)
+        {
+            var btn = new Button { Content = caption };
+            btn.Click += (_, __) =>
+            {
+                res = r;
+                msgbox.Close();
+            };
+            if(buttonPanel == null) return;
+            buttonPanel.Children.Add(btn);
+            if (def)
+                res = r;
+        }
+
+        if (buttons == MessageBoxButton.Ok || buttons == MessageBoxButton.OkCancel)
+            AddButton("Ok", MessageBoxResult.Ok, true);
+        if (buttons == MessageBoxButton.YesNo || buttons == MessageBoxButton.YesNoCancel)
+        {
+            AddButton("Yes", MessageBoxResult.Yes);
+            AddButton("No", MessageBoxResult.No, true);
+        }
+
+        if (buttons == MessageBoxButton.OkCancel || buttons == MessageBoxButton.YesNoCancel)
+            AddButton("Cancel", MessageBoxResult.Cancel, true);
+
+
+
+        var tcs = new TaskCompletionSource<MessageBoxResult>();
+        msgbox.Closed += delegate { tcs.TrySetResult(res); };
+        if (parent != null)
+            msgbox.ShowDialog(parent);
+        else msgbox.Show();
+        return tcs.Task;
+    }
+}
+public enum MessageBoxButton
+{
+    Ok,
+    OkCancel,
+    YesNo,
+    YesNoCancel
+}
+
+public enum MessageBoxResult
+{
+    Ok,
+    Cancel,
+    Yes,
+    No
+}
--- a/PLG-Exam.sln
+++ b/PLG-Exam.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PLG-Exam", "PLG-Exam.csproj", "{F120D7C1-1272-40DA-9CBB-0EE2DC779632}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F120D7C1-1272-40DA-9CBB-0EE2DC779632}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F120D7C1-1272-40DA-9CBB-0EE2DC779632}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F120D7C1-1272-40DA-9CBB-0EE2DC779632}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F120D7C1-1272-40DA-9CBB-0EE2DC779632}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {357C5A9A-CDAF-4061-ABC2-8F768DA586D2}
+	EndGlobalSection
+EndGlobal