add filtering

Views/Selection/Selection.axaml.cs

@@ -1,8 +1,11 @@
+using Microsoft.VisualBasic;
 using System;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
+using System.Threading.Tasks;
 using Avalonia.Controls;
 using MercuryConverter.Data;
+using Avalonia;
 
 namespace MercuryConverter.Views;
 
@@ -13,19 +16,35 @@ public partial class Selection : Panel
     {
         InitializeComponent();
         ListingTable.SelectionMode = DataGridSelectionMode.Extended;
-        SourceFilter.ItemsSource = new string[]{
-            "",
-            Consts.NUM_SOURCE[1],
-            Consts.NUM_SOURCE[2],
-            Consts.NUM_SOURCE[3],
-            Consts.NUM_SOURCE[4],
-            Consts.NUM_SOURCE[5],
-        };
-        
+
+        foreach (var (k, v) in Consts.NUM_SOURCE)
+        {
+            FilterSourceContainer.Children.Add(
+                new CheckBox
+                {
+                    Name = $"FilterSourceCheckbox{k}",
+                    Content = v,
+                }
+            );
+        }
+        foreach (var (k, v) in Consts.CATEGORY_INDEX)
+        {
+            if (k == -1)
+                continue;
+
+            FilterCategoryContainer.Children.Add(
+                new CheckBox
+                {
+                    Name = $"FilterCategoryCheckbox{k}",
+                    Content = v,
+                }
+            );
+        }
+
         SongCollection.CollectionChanged += OnSongsChg;
         DataContext = this;
 
-        // test data
+        // placeholder data
         if (SongCollection.Count == 0)
         {
             SongCollection.Add(