refactor: Adjusted the view model to support reactive programming.

src/ZonyLrcTools.Desktop/Pages/HomePage.axaml

@@ -6,13 +6,13 @@
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              x:Class="ZonyLrcTools.Desktop.Pages.HomePage"
              x:DataType="viewModels:HomeViewModel">
-    
+
     <DockPanel>
         <StackPanel DockPanel.Dock="Bottom" Margin="10">
             <TextBlock Text="下载进度:" Margin="0,0,0,5" />
-            <ProgressBar Value="{Binding DownloadProgress}" Maximum="100" Height="20" />
+            <ProgressBar Value="{Binding DownloadProgress}" Maximum="{Binding MaxProgress}" Height="20" />
         </StackPanel>
-        
+
         <DataGrid AutoGenerateColumns="False"
                   IsReadOnly="True"
                   GridLinesVisibility="All"

src/ZonyLrcTools.Desktop/Pages/HomePage.axaml.cs

@@ -1,4 +1,6 @@
+using Avalonia;
 using Avalonia.Controls;
+using ZonyLrcTools.Desktop.ViewModels;
 
 namespace ZonyLrcTools.Desktop.Pages;
 
@@ -8,4 +10,15 @@ public partial class HomePage : UserControl
     {
         InitializeComponent();
     }
+
+    protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
+    {
+        base.OnAttachedToVisualTree(e);
+        
+        if (DataContext is HomeViewModel vm)
+        {
+            vm.MaxProgress = 100;
+            vm.DownloadProgress = 0;
+        }
+    }
 }

src/ZonyLrcTools.Desktop/ViewModels/HomeViewModel.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.ObjectModel;
 using ReactiveUI;
 using ZonyLrcTools.Common;
@@ -6,26 +7,66 @@ namespace ZonyLrcTools.Desktop.ViewModels;
 
 public class HomeViewModel : ViewModelBase
 {
-    public ObservableCollection<SongInfoViewModel> Songs { get; } = [];
+    private ObservableCollection<SongInfoViewModel> _songs = new();
 
-    private double _downloadProgress;
+    public ObservableCollection<SongInfoViewModel> Songs
+    {
+        get => _songs;
+        set => this.RaiseAndSetIfChanged(ref _songs, value);
+    }
 
-    public double DownloadProgress
+    private int _downloadProgress;
+
+    public int DownloadProgress
     {
         get => _downloadProgress;
         set => this.RaiseAndSetIfChanged(ref _downloadProgress, value);
     }
+
+    private int _maxProgress;
+
+    public int MaxProgress
+    {
+        get => _maxProgress;
+        set => this.RaiseAndSetIfChanged(ref _maxProgress, value);
+    }
 }
 
-public class SongInfoViewModel(MusicInfo info)
+public class SongInfoViewModel : ReactiveObject
 {
-    private MusicInfo Info { get; } = info;
+    public SongInfoViewModel(MusicInfo info)
+    {
+        _info = info;
+        DownloadStatus = DownloadStatus.NotStarted;
+
+        this.WhenAnyValue(x => x.Info)
+            .Subscribe(_ =>
+            {
+                this.RaisePropertyChanged(nameof(SongName));
+                this.RaisePropertyChanged(nameof(ArtistName));
+                this.RaisePropertyChanged(nameof(FilePath));
+            });
+    }
+
+    private MusicInfo _info;
+
+    public MusicInfo Info
+    {
+        get => _info;
+        set => this.RaiseAndSetIfChanged(ref _info, value);
+    }
 
     public string SongName => Info.Name;
     public string ArtistName => Info.Artist;
     public string FilePath => Info.FilePath;
 
-    public DownloadStatus DownloadStatus { get; set; } = DownloadStatus.NotStarted;
+    private DownloadStatus _downloadStatus;
+
+    public DownloadStatus DownloadStatus
+    {
+        get => _downloadStatus;
+        set => this.RaiseAndSetIfChanged(ref _downloadStatus, value);
+    }
 }
 
 public enum DownloadStatus