harmonia/Harmonia.WinUI/ViewModels/PlaylistsViewModel.cs

using Harmonia.Core.Playlists;
using System;
using System.Collections.ObjectModel;

namespace Harmonia.WinUI.ViewModels;

public partial class PlaylistsViewModel : ViewModelBase
{
    private readonly IPlaylistManager _playlistManager;

    private ObservableCollection<Playlist> _playlists = [];
    public ObservableCollection<Playlist> Playlists
    {
        get
        {
            return _playlists;
        }
        set
        {
            SetProperty(ref _playlists, value);
        }
    }

    private Playlist? _selectedPlaylist = null;
    public Playlist? SelectedPlaylist
    {
        get
        {
            return _selectedPlaylist;
        }
        set
        {
            if (SetProperty(ref _selectedPlaylist, value))
            {
                _playlistManager.CurrentPlaylist = value;
            }
        }
    }

    public PlaylistsViewModel(IPlaylistManager playlistManager)
    {
        _playlistManager = playlistManager;
        _playlistManager.PlaylistAdded += OnPlaylistAdded;
        _playlistManager.PlaylistRemoved += OnPlaylistRemoved;
        _playlistManager.CurrentPlaylistChanged += OnCurrentPlaylistChanged;

        _playlists = new(_playlistManager.Playlists);
        _selectedPlaylist = _playlistManager.CurrentPlaylist;
    }

    private void OnCurrentPlaylistChanged(object? sender, EventArgs e)
    {
        SelectedPlaylist = _playlistManager.CurrentPlaylist;
    }

    private void OnPlaylistAdded(object? sender, PlaylistAddedEventArgs e)
    {
        Playlists.Add(e.Playlist);
    }

    private void OnPlaylistRemoved(object? sender, PlaylistRemovedEventArgs e)
    {
        Playlists.Remove(e.Playlist);
    }
}