wabbajack/Wabbajack.App/Controls/FileSelectionBoxViewModel.cs

using System;
using System.Linq;
using System.Reactive;
using System.Reactive.Disposables;
using System.Threading.Tasks;
using Avalonia.Controls;
using ReactiveUI;
using ReactiveUI.Fody.Helpers;
using Wabbajack.App.ViewModels;
using Wabbajack.Paths;

namespace Wabbajack.App.Controls
{
    public class FileSelectionBoxViewModel : ViewModelBase
    {
        [Reactive] public AbsolutePath Path { get; set; }

        [Reactive] public Extension[] Extensions { get; set; } = Array.Empty<Extension>();
        
        [Reactive] public bool SelectFolder { get; set; }
        
        [Reactive]
        public ReactiveCommand<Unit, Task> BrowseCommand { get; set; } = null!;

        public FileSelectionBoxViewModel()
        {

            Activator = new ViewModelActivator();
            this.WhenActivated(disposables =>
            {
                BrowseCommand = ReactiveCommand.Create(async () =>
                {
                    if (SelectFolder)
                    {
                        var dialog = new OpenFolderDialog()
                        {
                            Title = "Select a folder",
                        };
                        var result = await dialog.ShowAsync(App.MainWindow);
                        if (result != null)
                            Path = result.ToAbsolutePath();
                    }
                    else
                    {
                        var extensions = Extensions.Select(e => e.ToString()[1..]).ToList();
                        var dialog = new OpenFileDialog
                        {
                            AllowMultiple = false,
                            Title = "Select a file",
                            Filters = new()
                            {
                                new FileDialogFilter { Extensions = extensions, Name = "*" }
                            }
                        };
                        var results = await dialog.ShowAsync(App.MainWindow);
                        if (results != null)
                            Path = results!.First().ToAbsolutePath();
                    }
                }).DisposeWith(disposables);
            });
            
        }
        
    }
}