[fix:] fixed several issues and improved performance as well as ux

App.axaml

@@ -1,14 +1,11 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              x:Class="PLG_Exam.App"
-             RequestedThemeVariant="Dark">
+             RequestedThemeVariant="Light">
              <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
 
-    <Application.Styles>
+<Application.Styles>
-        <FluentTheme />
+    <FluentTheme />
-    </Application.Styles>
+</Application.Styles>
-    <Application.Resources>
+
-        <x:Double x:Key="DatePickerThemeMinWidth">10</x:Double> 
-        <x:Double x:Key="DatePickerThemeMaxWidth">1000</x:Double> 
-    </Application.Resources>
 </Application>

App.axaml.cs

@@ -1,6 +1,8 @@
 using Avalonia;
+using Avalonia.Controls;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
+using Avalonia.Styling;
 
 namespace PLG_Exam;
 
@@ -11,6 +13,13 @@ public partial class App : Application
         AvaloniaXamlLoader.Load(this);
     }
 
+    public void ToggleTheme()
+    {
+        RequestedThemeVariant = RequestedThemeVariant == ThemeVariant.Dark 
+            ? ThemeVariant.Light 
+            : ThemeVariant.Dark;
+    }
+
     public override void OnFrameworkInitializationCompleted()
     {
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)

MainWindow.axaml

@@ -7,9 +7,9 @@
         Title="PLG Exam">
     <DockPanel Margin="10">
         <!-- Unterer Teil: Dateiverwaltung -->
-        <Border DockPanel.Dock="Top" Background="#232327" Height="60" Margin="0,0,0,10">
+        <Border DockPanel.Dock="Top" x:Name="BrdTop" Height="30" Margin="0,0,0,10">
         <Grid>
-            <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" Margin="10" VerticalAlignment="Center" Spacing="10">
+            <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Center" Spacing="10">
                     <Button Content="Speichern" Click="OnSaveClick" />
                     <Button Content="Speichern unter..." Click="OnSaveAsClick" />
                     <Button Content="Öffnen" Click="OnOpenClick" />
@@ -17,22 +17,23 @@
                     <Button Content="Abgeben" Click="OnSubmitClick" />
                     
                 </StackPanel>
-                <Label x:Name="LblFilename" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,0,0,10" Content="Ungespeichert *" />
+                <Label x:Name="LblFilename" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,0,0,0" Content="Ungespeichert *" />
+                <Button Content="Dark Mode" Click="OnDarkModeClick" x:Name="BtnTheme" HorizontalAlignment="Right" Margin="0,0,0,0" />
         </Grid>
         </Border>
 
         <!-- Überoberer Teil: Title -->
-        <Border DockPanel.Dock="Top" Background="#232327" Height="82" Margin="0,0,0,10">
+        <Border DockPanel.Dock="Top" x:Name="BrdTitle"  Height="82" Margin="0,0,0,10">
             <Grid Margin="10">
                 <StackPanel Grid.Column="0" Margin="5" Spacing="5">
-                    <TextBlock Text="Titel der Arbeit" FontWeight="Bold" Foreground="White" />
+                    <TextBlock Text="Titel der Arbeit" FontWeight="Bold" />
                     <TextBox Name="TitleField" Height="33"/>
                 </StackPanel>
             </Grid>
         </Border>
 
         <!-- Oberer Teil: Name, Vorname, Datum -->
-        <Border DockPanel.Dock="Top" Background="#232327" Height="82" Margin="0,0,0,10">
+        <Border DockPanel.Dock="Top" x:Name="BrdName" Height="82" Margin="0,0,0,10">
             <Grid Margin="10">
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="*" />
@@ -40,22 +41,22 @@
                     <ColumnDefinition Width="350" />
                 </Grid.ColumnDefinitions>
                 <StackPanel Grid.Column="0" Margin="5" Spacing="5">
-                    <TextBlock Text="Name" FontWeight="Bold" Foreground="White" />
+                    <TextBlock Text="Name" FontWeight="Bold" />
                     <TextBox Name="NameField" Height="33"/>
                 </StackPanel>
                 <StackPanel Grid.Column="1" Margin="5" Spacing="5"> 
-                    <TextBlock Text="Vorname" FontWeight="Bold" Foreground="White" />
+                    <TextBlock Text="Vorname" FontWeight="Bold" />
                     <TextBox Name="VornameField" Height="33"/>
                 </StackPanel>
                 <StackPanel Grid.Column="2" Margin="5" Spacing="5">
-                    <TextBlock Text="Datum" HorizontalAlignment="Stretch" FontWeight="Bold" Foreground="White" />
+                    <TextBlock Text="Datum" HorizontalAlignment="Stretch" FontWeight="Bold" />
                     <DatePicker Name="DatumField" Width="340" Height="33" />
                 </StackPanel>
             </Grid>
         </Border>
 
         <!-- Mittlerer Teil: Tabansicht -->
-        <Border Background="#232327" Margin="0,0,0,0">
+        <Border x:Name="BrdMid" 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">

MainWindow.axaml.cs

@@ -19,9 +19,8 @@ using PdfSharp.Fonts;
 using System.Globalization;
 using MigraDoc.DocumentObjectModel;
 using System.Net.NetworkInformation;
-
+using Avalonia.Styling;
-// ToDo
+using Avalonia.Themes.Fluent;
-// - White Mode Access
 
 
 namespace PLG_Exam
@@ -41,6 +40,41 @@ namespace PLG_Exam
 
             this.KeyDown += OnKeyDown;
             GlobalFontSettings.FontResolver = new CustomFontResolver();
+
+            RenewColors();
+            this.Closing += MainWindow_Closing;
+            
+        }
+
+        private void OnDarkModeClick(object? sender, RoutedEventArgs e)
+        {
+            if (Application.Current is App app)
+            {
+                app.ToggleTheme();
+                RenewColors();
+            }
+
+            
+        }
+
+        private void RenewColors(){
+            if(Application.Current.ActualThemeVariant == ThemeVariant.Dark){
+                BrdMid.Background = new SolidColorBrush(Avalonia.Media.Color.FromRgb(35,35,39)); // #232327
+                //BrdTop.Background = new SolidColorBrush(Avalonia.Media.Color.FromRgb(35,35,39)); // #232327
+                BrdTitle.Background = new SolidColorBrush(Avalonia.Media.Color.FromRgb(35,35,39)); // #232327
+                BrdName.Background = new SolidColorBrush(Avalonia.Media.Color.FromRgb(35,35,39)); // #232327
+            } else {
+                BrdMid.Background = new SolidColorBrush(Avalonia.Media.Color.FromRgb(230,230,230)); // #232327
+                //BrdTop.Background = new SolidColorBrush(Avalonia.Media.Color.FromRgb(230,230,230)); // #232327
+                BrdTitle.Background = new SolidColorBrush(Avalonia.Media.Color.FromRgb(230,230,230)); // #232327
+                BrdName.Background = new SolidColorBrush(Avalonia.Media.Color.FromRgb(230,230,230)); // #232327
+            }
+
+            if(Application.Current.ActualThemeVariant == ThemeVariant.Dark){
+                BtnTheme.Content="🌞";
+            } else {
+                BtnTheme.Content="🌙";
+            }
         }
 
         // Event für "Neuen Tab hinzufügen"
@@ -296,7 +330,9 @@ namespace PLG_Exam
             _currentFilePath = filePath;
             _isSaved = true;
 
-            LblFilename.Content = !_currentFilePath.IsValueNullOrEmpty() ? Path.GetFileName(_currentFilePath) : "Ungespeichert ";
+            LblFilename.Content = !_currentFilePath.IsValueNullOrEmpty() ? Path.GetFileName(_currentFilePath) : "Ungespeichert *";
+
+            SaveToFile(filePath);
         }
 
         private StackPanel ReturnTabHeaderContent(string name, TabItem curr_tab){
@@ -347,6 +383,30 @@ namespace PLG_Exam
             return headerStackPanel;
         }
 
+        private async void MainWindow_Closing(object? sender, System.ComponentModel.CancelEventArgs e)
+        {
+            e.Cancel = true;
+            if (!_isSaved)
+            {
+                MessageBoxResult result = await MessageBox.Show(this, "Möchten Sie die aktuellen Änderungen speichern?", 
+                                                   "Nicht gespeicherte Änderungen", MessageBoxButton.YesNoCancel);
+                if (result == MessageBoxResult.Cancel) {
+                    e.Cancel = true;
+                    return;
+                }
+                if (result == MessageBoxResult.Yes) {
+                    //SaveToFile(_currentFilePath);
+                    OnSaveClick(null,null);
+                    if(_isSaved == false){
+                        e.Cancel = true;
+                        return;
+                    }
+                }
+            }
+            e.Cancel = false;
+            Environment.Exit(0);
+        }
+
         // Neu
         private async void OnNewClick(object? sender, RoutedEventArgs e)
         {
@@ -371,7 +431,7 @@ namespace PLG_Exam
             _currentFilePath = null;
             _isSaved = true;
 
-            LblFilename.Content = (!_currentFilePath.IsValueNullOrEmpty() ? Path.GetFileName(_currentFilePath) : "Ungespeichert ") + " *";
+            LblFilename.Content = !_currentFilePath.IsValueNullOrEmpty() ? Path.GetFileName(_currentFilePath) : "Ungespeichert *";
         }
 
         private Grid CreateTabContent(string? aufgabennummer = null, string? ueberschrift = null, string? beschreibung = null)

MessageBox.axaml.cs

@@ -42,12 +42,12 @@ public partial class MessageBox : Window
             AddButton("Ok", MessageBoxResult.Ok, true);
         if (buttons == MessageBoxButton.YesNo || buttons == MessageBoxButton.YesNoCancel)
         {
-            AddButton("Yes", MessageBoxResult.Yes);
+            AddButton("Ja", MessageBoxResult.Yes);
-            AddButton("No", MessageBoxResult.No, true);
+            AddButton("Nein", MessageBoxResult.No, true);
         }
 
         if (buttons == MessageBoxButton.OkCancel || buttons == MessageBoxButton.YesNoCancel)
-            AddButton("Cancel", MessageBoxResult.Cancel, true);
+            AddButton("Abbrechen", MessageBoxResult.Cancel, true);
 
 
 

ThemeManager.cs

@@ -0,0 +1,16 @@
+using System;
+using Avalonia;
+
+namespace PLG_Exam;
+
+public static class ThemeManager
+{
+    public static string CurrentBackgroundColor
+    {
+        get
+        {
+            return nameof(Application.RequestedThemeVariant) + "ModeBackground";
+            //return isDarkMode ? "DarkModeBackground" : "LightModeBackground";
+        }
+    }
+}

obj/PLG-Exam.csproj.nuget.dgspec.json

@@ -54,6 +54,8 @@
               "version": "[11.2.1, )"
             },
             "Avalonia.Diagnostics": {
+              "include": "None",
+              "suppressParent": "All",
               "target": "Package",
               "version": "[11.2.1, )"
             },

obj/project.assets.json

@@ -114,12 +114,12 @@
           "Avalonia.Remote.Protocol": "11.2.1"
         },
         "compile": {
-          "lib/net8.0/Avalonia.Controls.ColorPicker.dll": {
+          "lib/net8.0/_._": {
             "related": ".xml"
           }
         },
         "runtime": {
-          "lib/net8.0/Avalonia.Controls.ColorPicker.dll": {
+          "lib/net8.0/_._": {
             "related": ".xml"
           }
         }
@@ -131,12 +131,12 @@
           "Avalonia.Remote.Protocol": "11.2.1"
         },
         "compile": {
-          "lib/net8.0/Avalonia.Controls.DataGrid.dll": {
+          "lib/net8.0/_._": {
             "related": ".xml"
           }
         },
         "runtime": {
-          "lib/net8.0/Avalonia.Controls.DataGrid.dll": {
+          "lib/net8.0/_._": {
             "related": ".xml"
           }
         }
@@ -170,12 +170,12 @@
           "Avalonia.Themes.Simple": "11.2.1"
         },
         "compile": {
-          "lib/net8.0/Avalonia.Diagnostics.dll": {
+          "lib/net8.0/_._": {
             "related": ".xml"
           }
         },
         "runtime": {
-          "lib/net8.0/Avalonia.Diagnostics.dll": {
+          "lib/net8.0/_._": {
             "related": ".xml"
           }
         }
@@ -292,12 +292,12 @@
           "Avalonia": "11.2.1"
         },
         "compile": {
-          "lib/net8.0/Avalonia.Themes.Simple.dll": {
+          "lib/net8.0/_._": {
             "related": ".xml"
           }
         },
         "runtime": {
-          "lib/net8.0/Avalonia.Themes.Simple.dll": {
+          "lib/net8.0/_._": {
             "related": ".xml"
           }
         }
@@ -6388,6 +6388,8 @@
             "version": "[11.2.1, )"
           },
           "Avalonia.Diagnostics": {
+            "include": "None",
+            "suppressParent": "All",
             "target": "Package",
             "version": "[11.2.1, )"
           },

obj/project.nuget.cache

@@ -1,6 +1,6 @@
 {
   "version": 2,
-  "dgSpecHash": "YIPRJ6ABhso=",
+  "dgSpecHash": "mnXgl9Kb58w=",
   "success": true,
   "projectFilePath": "/home/fierke/Nextcloud/Documents/source/repos/PLG_Exam/PLG-Exam/PLG-Exam.csproj",
   "expectedPackageFiles": [