MercuryConverter/Views/Selection/Selection.axaml.cs

using System;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using Avalonia.Controls;
using MercuryConverter.Data;

namespace MercuryConverter.Views;

public partial class Selection : Panel
{
    public static ObservableCollection<Song> SongCollection { get; } = new();
    public Selection()
    {
        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],
        };
        
        SongCollection.CollectionChanged += OnSongsChg;
        DataContext = this;

        // test data
        if (SongCollection.Count == 0)
        {
            SongCollection.Add(
                new Song { Id = "S00-000", Name = "A Name", Artist = "An Artist", Source = Consts.NUM_SOURCE[2] }
            );
            SongCollection.Add(
                new Song { Id = "S00-001", Name = "A Name", Artist = "An Artist", Source = Consts.NUM_SOURCE[3] }
            );
        }
    }

    private void OnSongsChg(object? sender, NotifyCollectionChangedEventArgs e)
    {
        Console.WriteLine("Songs collection changed!");

        if (e.NewItems != null)
        {
            Console.WriteLine("Added...");
            foreach (Song added in e.NewItems)
            {
                Console.WriteLine($"[{added.Id}] {added.Artist} - {added.Name}");
            }
        }
        if (e.OldItems != null)
        {
            Console.WriteLine("Removed...");
            foreach (Song rem in e.OldItems)
            {
                Console.WriteLine($"[{rem.Id}] {rem.Artist} - {rem.Name}");
            }
        } 
    }
}