Migrate ChapterTool from .NET Framework 4.8 WinForms to .NET 8 Avalonia UI - Complete Implementation with Additional Dialogs

ChapterTool.Avalonia/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="ChapterTool.Avalonia.App"
+             xmlns:local="using:ChapterTool.Avalonia"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

ChapterTool.Avalonia/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using System.Linq;
+using Avalonia.Markup.Xaml;
+using ChapterTool.Avalonia.ViewModels;
+using ChapterTool.Avalonia.Views;
+
+namespace ChapterTool.Avalonia;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            // Avoid duplicate validations from both Avalonia and the CommunityToolkit. 
+            // More info: https://docs.avaloniaui.net/docs/guides/development-guides/data-validation#manage-validationplugins
+            DisableAvaloniaDataAnnotationValidation();
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = new MainWindowViewModel(),
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    private void DisableAvaloniaDataAnnotationValidation()
+    {
+        // Get an array of plugins to remove
+        var dataValidationPluginsToRemove =
+            BindingPlugins.DataValidators.OfType<DataAnnotationsValidationPlugin>().ToArray();
+
+        // remove each entry found
+        foreach (var plugin in dataValidationPluginsToRemove)
+        {
+            BindingPlugins.DataValidators.Remove(plugin);
+        }
+    }
+}

ChapterTool.Avalonia/ChapterTool.Avalonia.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    <RootNamespace>ChapterTool</RootNamespace>
+    <AssemblyName>ChapterTool</AssemblyName>
+    <ApplicationIcon>Assets\icon.ico</ApplicationIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.3.6" />
+    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.3.6" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.3.6" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.6" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.6" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.3.6">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ChapterTool.Core\ChapterTool.Core.csproj" />
+  </ItemGroup>
+</Project>

ChapterTool.Avalonia/Program.cs

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+using Avalonia;
+using System;
+
+namespace ChapterTool.Avalonia;
+
+sealed class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+}

ChapterTool.Avalonia/README.md

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+# ChapterTool - Modern Cross-Platform Edition
+
+A modern, cross-platform chapter extraction and editing tool built with Avalonia UI and .NET 8.
+
+## Features
+
+- **Cross-Platform**: Runs on Windows, macOS, and Linux
+- **Modern UI**: Built with Avalonia UI framework
+- **Multiple Format Support**: Extract and edit chapters from various media formats
+- **MVVM Architecture**: Clean separation of concerns with proper MVVM pattern
+
+## Supported File Formats
+
+### Input Formats
+- **OGM** (`.txt`) - Simple text-based chapter format
+- **XML** (`.xml`) - Matroska XML chapter format
+- **MPLS** (`.mpls`) - Blu-ray playlist files
+- **IFO** (`.ifo`) - DVD information files
+- **XPL** (`.xpl`) - HD DVD playlist files
+- **CUE** (`.cue`, `.flac`, `.tak`) - Cue sheets and embedded cues
+- **Matroska** (`.mkv`, `.mka`) - Matroska media files
+- **MP4** (`.mp4`, `.m4a`, `.m4v`) - MP4 media files
+- **WebVTT** (`.vtt`) - Web Video Text Tracks
+
+### Export Formats
+- Plain text (OGM format)
+- XML (Matroska format)
+- QPF (QP file for video encoding)
+- JSON (custom format)
+- CUE sheets
+- Timecodes
+
+## Requirements
+
+### Runtime
+- .NET 8 Runtime
+- **For Matroska support**: [MKVToolNix](https://mkvtoolnix.download/)
+- **For MP4 support**: libmp4v2 (included for Windows)
+
+### Development
+- .NET 8 SDK
+- Visual Studio 2022, VS Code, or Rider
+
+## Building from Source
+
+```bash
+# Clone the repository
+git clone https://github.com/tautcony/ChapterTool.git
+cd ChapterTool
+
+# Restore dependencies
+dotnet restore ChapterTool.Modern.sln
+
+# Build the solution
+dotnet build ChapterTool.Modern.sln
+
+# Run the application
+dotnet run --project ChapterTool.Avalonia
+```
+
+## Project Structure
+
+```
+ChapterTool/
+├── ChapterTool.Core/           # Core business logic library
+│   ├── Models/                 # Data models
+│   ├── Util/                   # Utilities and helpers
+│   ├── ChapterData/            # Format-specific parsers
+│   ├── Knuckleball/            # MP4 chapter support
+│   └── SharpDvdInfo/           # DVD parsing
+├── ChapterTool.Avalonia/       # Avalonia UI application
+│   ├── Views/                  # XAML views
+│   ├── ViewModels/             # View models
+│   └── Assets/                 # Icons and resources
+└── Time_Shift/                 # Legacy .NET Framework version
+```
+
+## Architecture
+
+The application follows the MVVM (Model-View-ViewModel) pattern:
+
+- **Models** (`ChapterTool.Core`): Platform-independent business logic
+- **Views** (`ChapterTool.Avalonia/Views`): Avalonia XAML UI definitions
+- **ViewModels** (`ChapterTool.Avalonia/ViewModels`): Presentation logic and data binding
+
+### Key Components
+
+#### Core Library
+- **ChapterInfo**: Main data model for chapter information
+- **Chapter Parsers**: Format-specific parsers for all supported formats
+- **ToolKits**: Utility methods for time conversions and formatting
+- **Cross-Platform Services**:
+  - `RegistryStorage`: JSON-based settings storage
+  - `Logger`: Event-based logging
+  - `Notification`: UI notification abstraction
+
+#### Avalonia UI
+- **MainWindowViewModel**: Main application view model
+- **ChapterViewModel**: Individual chapter data binding
+- MVVM commands for file operations
+
+## Platform-Specific Notes
+
+### Windows
+- Native MP4 support with bundled libmp4v2.dll
+- MKVToolNix detection via installation path
+
+### Linux
+- Install libmp4v2 via package manager:
+  ```bash
+  # Debian/Ubuntu
+  sudo apt install libmp4v2-2
+
+  # Fedora/RHEL
+  sudo dnf install libmp4v2
+
+  # Arch Linux
+  sudo pacman -S libmp4v2
+  ```
+- MKVToolNix typically in `/usr/bin`
+
+### macOS
+- Install dependencies via Homebrew:
+  ```bash
+  brew install mp4v2 mkvtoolnix
+  ```
+
+## Publishing
+
+### Self-Contained Executable
+
+```bash
+# Windows
+dotnet publish ChapterTool.Avalonia -c Release -r win-x64 --self-contained -p:PublishSingleFile=true
+
+# Linux
+dotnet publish ChapterTool.Avalonia -c Release -r linux-x64 --self-contained -p:PublishSingleFile=true
+
+# macOS
+dotnet publish ChapterTool.Avalonia -c Release -r osx-x64 --self-contained -p:PublishSingleFile=true
+```
+
+### Framework-Dependent
+
+```bash
+dotnet publish ChapterTool.Avalonia -c Release -r <runtime-identifier>
+```
+
+## Migration from Legacy Version
+
+This modern version maintains compatibility with chapter files created by the legacy .NET Framework version. Settings and configurations will be migrated from Registry (Windows) to JSON-based storage automatically.
+
+For detailed migration information, see [MIGRATION.md](../MIGRATION.md).
+
+## Usage
+
+1. **Load a File**: Click "Load File" and select a media file or chapter file
+2. **View Chapters**: Chapters are displayed in the main grid
+3. **Edit Chapters**: Modify chapter names and times
+4. **Apply Time Expression**: Use expressions to adjust all chapter times
+5. **Export**: Choose export format and save chapters
+
+## Development Status
+
+This is the modern cross-platform rewrite of ChapterTool. Current status:
+
+✅ Core library fully functional with all parsers
+✅ Avalonia UI framework set up
+✅ Basic MVVM architecture implemented
+🚧 UI implementation in progress
+🚧 Full feature parity with legacy version
+🚧 Comprehensive testing on all platforms
+
+## Contributing
+
+Contributions are welcome! Please feel free to submit issues and pull requests.
+
+## License
+
+Distributed under the GPLv3+ License. See [LICENSE](../LICENSE) for more information.
+
+## Acknowledgments
+
+- Original .NET Framework version by TautCony
+- [Avalonia UI](https://avaloniaui.net/) - Cross-platform XAML framework
+- [CommunityToolkit.Mvvm](https://github.com/CommunityToolkit/dotnet) - MVVM helpers
+- All the open-source projects that made this possible
+
+## Links
+
+- **Original Project**: [GitHub](https://github.com/tautcony/ChapterTool)
+- **Documentation**: [Wiki](https://github.com/tautcony/ChapterTool/wiki)
+- **Issue Tracker**: [Issues](https://github.com/tautcony/ChapterTool/issues)

ChapterTool.Avalonia/ViewLocator.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using ChapterTool.Avalonia.ViewModels;
+
+namespace ChapterTool.Avalonia;
+
+public class ViewLocator : IDataTemplate
+{
+
+    public Control? Build(object? param)
+    {
+        if (param is null)
+            return null;
+
+        var name = param.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+        var type = Type.GetType(name);
+
+        if (type != null)
+        {
+            return (Control)Activator.CreateInstance(type)!;
+        }
+
+        return new TextBlock { Text = "Not Found: " + name };
+    }
+
+    public bool Match(object? data)
+    {
+        return data is ViewModelBase;
+    }
+}