Sixdegreeoffreedomdynamicloadsimulationdevice/Client/IViewModel/ViewModels/File/FileLoadViewModel.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Platform.Storage;
using CommunityToolkit.Mvvm.Input;
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace IViewModel.ViewModels
{
    public sealed class FileLoadViewModel:DisplayViewModelBase
    {
        private FileLoadViewModel() : base()
        {
            Content = typeof(Views.LoadConfigView);
            Title = nameof(LanguageValueViewModel.MenuLoadConfig);
        }
        static FileLoadViewModel()
        {

        }
        public override bool ShowTop => true;
        public override string IconKey => nameof(IconResourceValueViewModel.LoadConfigGeometry);
        public static FileLoadViewModel Instance { get; } = new FileLoadViewModel();
        public override bool AppendSeparator => false;
        public override string MenuKey => nameof(LanguageValueViewModel.MenuLoadConfig);
        public override string MenuParentKey => nameof(LanguageValueViewModel.MenuFile);
        public override string OKContent => nameof(LanguageValueViewModel.Confirm);
        public override bool CanResize => false;
        public override double Height => 320;
        public override double Width => 620;
        private string filter = "*";
        public override void InitData()
        {
            base.InitData();
            LoadFileAction = null;
        }
        public string Filter
        {
            get => filter;
            set
            {
                if (string.IsNullOrEmpty(value))
                {
                    filter = "*";
                }
                else filter = value;
            }
        }
        public ICommand SelectFileCommand => new RelayCommand<string?>(SelectFile);
        [AllowNull]
        public Action<string> LoadFileAction { get; set; }
        private async void SelectFile(string? p)
        {
            if (Application.Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
            {
                var folder = await TopLevel.GetTopLevel(desktop.MainWindow)!.StorageProvider.OpenFilePickerAsync(new Avalonia.Platform.Storage.FilePickerOpenOptions()
                {
                    AllowMultiple = false,
                    Title = p == null ? "" : Application.Current?.FindResource(p) + "",
                    FileTypeFilter = new FilePickerFileType[]
                    {
                        new FilePickerFileType($"{(p ==null ?"": Application.Current?.FindResource(p) + "")}"){ Patterns = new []{"*."+Filter } }
                    }
                });
                if (folder != null && folder.Count > 0)
                {
                    LoadFileAction?.Invoke(folder.First().Path.LocalPath);
                }
            }
        }
    }
}