Save/load settings, Move about window to dialog

App.axaml

@@ -94,6 +94,9 @@
         <DataTemplate DataType="{x:Type viewModels:EditFileViewModel}">
             <views:EditFile/>
         </DataTemplate>
+        <DataTemplate DataType="{x:Type viewModels:AboutViewModel}">
+            <views:AboutView/>
+        </DataTemplate>
     </Application.DataTemplates>
     <Application.Resources>
         <ResourceDictionary>

App.axaml.cs

@@ -3,7 +3,9 @@ using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Interactivity;
 using Avalonia.Markup.Xaml;
+using DialogHostAvalonia;
 using ReceiptPDFBuilder;
+using ReceiptPDFBuilder.ViewModels;
 
 namespace ReceiptPDFBuilder;
 
@@ -26,6 +28,6 @@ public partial class App : Application
 
     public void AboutOnClick(object? sender, EventArgs args)
     {
-        new AboutWindow().Show();
+        DialogHost.Show(new AboutViewModel());
     }
 }

Models/ReportFile.cs

@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Text.Json.Serialization;
 using ReceiptPDFBuilder.Helpers;
 
 namespace ReceiptPDFBuilder.Models;
@@ -44,6 +45,7 @@ class ReportFile : ChangeNotifier
         }
     }
 
+    [JsonIgnore]
     public DateOnly ReceiptDate
     {
         get => DateOnly.FromDateTime(_receiptDateTime);
@@ -61,6 +63,7 @@ class ReportFile : ChangeNotifier
         set { _filePath = value; NotifyPropertyChanged(); }
     }
 
+    [JsonIgnore]
     public string FileName
     {
         get => Path.GetFileName(_filePath);

Models/Settings.cs

@@ -0,0 +1,86 @@
+using System;
+using System.IO;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Threading.Tasks;
+using ReceiptPDFBuilder.Helpers;
+
+namespace ReceiptPDFBuilder.Models;
+
+class Settings : ChangeNotifier
+{
+    private string _lastUsedPath;
+
+    public Settings()
+    {
+        _lastUsedPath = "";
+    }
+
+    [JsonInclude]
+    public string LastUsedPath
+    {
+        get => _lastUsedPath;
+        set { _lastUsedPath = value; NotifyPropertyChanged(); }
+    }
+
+    public static string GetSettingsFileName()
+    {
+        return "settings.json";
+    }
+
+    public static string GetSettingsPath()
+    {
+        var path = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+            "ReceiptPDFBuilder"
+        );
+        if (!Directory.Exists(path))
+        {
+            Directory.CreateDirectory(path);
+        }
+        return Path.Combine(path, GetSettingsFileName());
+    }
+
+    private static JsonSerializerOptions GetSerializerOptions()
+    {
+        var opts = new JsonSerializerOptions 
+        { 
+            WriteIndented = false,
+            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
+        };
+        return opts;
+    }
+
+    public async Task<string> SaveSettingsAsync()
+    {
+        var jsonContext = new SourceGenerationContext(GetSerializerOptions());
+        using MemoryStream memoryStream = new MemoryStream();
+        await JsonSerializer.SerializeAsync(memoryStream, this, jsonContext.Settings);
+        memoryStream.Position = 0;
+        using var reader = new StreamReader(memoryStream);
+        var json = await reader.ReadToEndAsync();
+        await File.WriteAllTextAsync(GetSettingsPath(), json);
+        return json;
+    }
+
+    public static Settings LoadSettings()
+    {
+        var path = GetSettingsPath();
+        if (!File.Exists(path))
+        {
+            return new Settings();
+        }
+        var json = File.ReadAllText(GetSettingsPath());
+        var jsonContext = new SourceGenerationContext(GetSerializerOptions());
+        return JsonSerializer.Deserialize<Settings>(json, jsonContext.Settings) ?? new Settings();
+    }
+
+    public static async Task<Settings> LoadSettingsAsync()
+    {
+        using FileStream fileStream = File.OpenRead(GetSettingsPath());
+        var jsonContext = new SourceGenerationContext(GetSerializerOptions());
+        var output = await JsonSerializer.DeserializeAsync<Settings>(fileStream, jsonContext.Settings) ?? new Settings();
+        return output;
+    }
+}

ViewModels/AboutViewModel.cs

@@ -0,0 +1,33 @@
+#nullable enable
+
+using System;
+using System.Collections.ObjectModel;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Avalonia.Platform.Storage;
+using Avalonia.Themes.Fluent;
+using DialogHostAvalonia;
+using ImageMagick;
+using MigraDoc.DocumentObjectModel;
+using MigraDoc.Rendering;
+using PdfSharp.Fonts;
+using PdfSharp.Pdf.IO;
+using PdfSharp.Snippets.Font;
+using ReceiptPDFBuilder.Interfaces;
+using ReceiptPDFBuilder.Models;
+
+namespace ReceiptPDFBuilder.ViewModels;
+
+class AboutViewModel
+{
+    public AboutViewModel()
+    {
+    }
+
+    public void Close()
+    {
+        DialogHost.Close("DialogHost", null);
+    }
+}

ViewModels/MainViewModel.cs

@@ -30,6 +30,8 @@ class MainViewModel : BaseViewModel, IFontResolver
     private string _reportTitle;
     private ObservableCollection<ReportFile> _reportFiles;
 
+    private Settings _settings;
+
     public MainViewModel(IChangeViewModel viewModelChanger) : base(viewModelChanger)
     {
         _baseDir = Path.GetDirectoryName(Environment.ProcessPath) ?? "";
@@ -39,6 +41,12 @@ class MainViewModel : BaseViewModel, IFontResolver
         _reportFiles = new ObservableCollection<ReportFile>();
         _reportFiles.CollectionChanged += ( sender, e ) => { NotifyPropertyChanged(nameof(IsCreatePDFButtonEnabled)); };
         _reportTitle = "";
+        _settings = Settings.LoadSettings();
+        if (!string.IsNullOrWhiteSpace(_settings.LastUsedPath))
+        {
+            LogInfo("Loading data at last used path of {0}", _settings.LastUsedPath);
+            ScanFolder(_settings.LastUsedPath);
+        }
     }
 
     public string ReportTitle
@@ -95,20 +103,27 @@ class MainViewModel : BaseViewModel, IFontResolver
             if (folders.Count == 1)
             {
                 var folder = folders[0];
-                LogInfo("Chosen folder: " + folder.Path.LocalPath);
-                if (Directory.Exists(folder.Path.LocalPath))
-                {
-                    _workingFolder = folder.Path.LocalPath;
-                    NotifyPropertyChanged(nameof(IsTitleBoxVisible));
-                    // TODO: Scan folder for saved info from previous reports and reload that first
-                    // Scan folder for files and display in DataGrid
-                    var filePaths = Directory.GetFiles(_workingFolder);
-                    filePaths.Sort();
-                    foreach (var filePath in filePaths)
-                    {
-                        AddFileBasedOnPath(filePath);
-                    }
-                }
+                LogInfo("Loading items in folder: " + folder.Path.LocalPath);
+                ScanFolder(folder.Path.LocalPath);
+                _settings.LastUsedPath = folder.Path.LocalPath;
+                await _settings.SaveSettingsAsync();
+            }
+        }
+    }
+
+    private void ScanFolder(string path)
+    {
+        if (Directory.Exists(path))
+        {
+            _workingFolder = path;
+            NotifyPropertyChanged(nameof(IsTitleBoxVisible));
+            // TODO: Scan folder for saved info from previous reports and reload that first
+            // Scan folder for files and display in DataGrid
+            var filePaths = Directory.GetFiles(_workingFolder);
+            filePaths.Sort();
+            foreach (var filePath in filePaths)
+            {
+                AddFileBasedOnPath(filePath);
             }
         }
     }

Views/AboutView.axaml

@@ -0,0 +1,23 @@
+<UserControl 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" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="ReceiptPDFBuilder.Views.AboutView"
+             xmlns:models="clr-namespace:ReceiptPDFBuilder.Models"
+             xmlns:vm="clr-namespace:ReceiptPDFBuilder.ViewModels"
+             xmlns:dialogHost="clr-namespace:DialogHostAvalonia;assembly=DialogHost.Avalonia"
+             x:DataType="vm:AboutViewModel">
+    <StackPanel Orientation="Vertical"
+                Spacing="4">
+        <TextBlock Text="Receipt PDF Builder was built by MB for A in 2026. May the quacking of ducks always be in your favor. Thanks for using!"
+                   MaxWidth="300"
+                   TextWrapping="Wrap"
+                   FontSize="14"/>
+        <Button Command="{Binding Close}"
+                Classes="accent"
+                Content="Close"
+                HorizontalAlignment="Right"
+                Margin="0,0,4,4"/>
+    </StackPanel>
+</UserControl>

Views/AboutView.axaml.cs

@@ -0,0 +1,15 @@
+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace ReceiptPDFBuilder.Views
+{
+    public partial class AboutView : UserControl
+    {
+        public AboutView()
+        {
+            this.InitializeComponent();
+        }
+    }
+}

Views/AboutWindow.axaml

@@ -1,16 +0,0 @@
-<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" d:DesignWidth="800" d:DesignHeight="450"
-        x:Class="ReceiptPDFBuilder.AboutWindow"
-        Title="About Receipt PDF Builder"
-        Width="300"
-        Height="300"
-        MaxHeight="400"
-        MaxWidth="400"
-        MinWidth="300"
-        MinHeight="300">
-  <TextBlock Text="Receipt PDF Builder was built by MB for A in 2026. Thanks for using!"
-             TextWrapping="Wrap"/>
-</Window>

Views/AboutWindow.axaml.cs

@@ -1,13 +0,0 @@
-using Avalonia;
-using Avalonia.Controls;
-using Avalonia.Markup.Xaml;
-
-namespace ReceiptPDFBuilder;
-
-public partial class AboutWindow : Window
-{
-    public AboutWindow()
-    {
-        InitializeComponent();
-    }
-}