feat: redesign SplitViewDemo.

demo/Semi.Avalonia.Demo/Pages/SplitViewDemo.axaml.cs

@@ -1,6 +1,7 @@
-using Avalonia;
+using System.Collections.ObjectModel;
 using Avalonia.Controls;
 using Avalonia.Markup.Xaml;
+using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace Semi.Avalonia.Demo.Pages;
 
@@ -9,10 +10,35 @@ public partial class SplitViewDemo : UserControl
     public SplitViewDemo()
     {
         InitializeComponent();
+        this.DataContext = new SplitViewDemoViewModel();
     }
 
     private void InitializeComponent()
     {
         AvaloniaXamlLoader.Load(this);
     }
+}
+
+public class SplitViewDemoViewModel : ObservableObject
+{
+    public ObservableCollection<string> Songs { get; set; } =
+    [
+        "320万年前",
+        "隐德来希",
+        "孔明",
+        "锦鲤卟噜噜",
+        "指鹿为马",
+        "热带季风Remix",
+        "加州梦境",
+        "渐近自由",
+        "世界所有的烂漫",
+    ];
+
+    public ObservableCollection<SplitViewDisplayMode> DisplayModes { get; set; } =
+    [
+        SplitViewDisplayMode.Inline,
+        SplitViewDisplayMode.CompactInline,
+        SplitViewDisplayMode.Overlay,
+        SplitViewDisplayMode.CompactOverlay,
+    ];
 }