Reorganization

Aurora/Design/Components/MediaPlayer/PlayerViewModel.cs

@@ -0,0 +1,163 @@
+using System;
+using Xamarin.Forms;
+using Aurora.Design.Views;
+using Aurora.Services.PlayerService;
+using Aurora.Models.Media;
+
+namespace Aurora.Design.Components.MediaPlayer
+{
+    public class PlayerViewModel : BaseViewModel
+    {
+        PlayerService _playerService;
+        BaseMetadata _metadata;
+
+        public PlayerViewModel()
+        {
+            _playerService = PlayerService.Instance;
+            _playerService.PlaybackStateChanged += OnPlaybackStateChanged;
+            _playerService.MediaChanged += OnMediaChanged;
+
+            PlayCommand = new Command(OnPlayExecute, CanPlayExecute);
+            PreviousCommand = new Command(OnPreviousExecute, CanPreviousExecute);
+            NextCommand = new Command(OnNextExecute, CanNextExecute);
+        }
+
+        ~PlayerViewModel()
+        {
+            _playerService.PlaybackStateChanged -= OnPlaybackStateChanged;
+
+        }
+
+        #region Public Properties
+        public Command PlayCommand { get; private set; }
+        public Command NextCommand { get; private set; }
+        public Command PreviousCommand { get; private set; }
+
+        public string PlayButtonText
+        {
+            get { return _playerService.PlaybackState == PlaybackState.Buffering ? "Play" : "Pause"; }
+        }
+
+        /// <summary>
+        /// TODO keep player view generic between audio and video.
+        /// </summary>
+        /// <value></value>
+        public string ArtistName
+        {
+            get
+            {
+                if (_metadata == null)
+                {
+                    return "";
+                }
+                AudioMetadata metadata = _metadata as AudioMetadata;
+                return metadata.Artist;
+            }
+        }
+
+        /// <summary>
+        /// TODO keep player view generic between audio and video.
+        /// </summary>
+        /// <value></value>
+        public string SongTitle
+        {
+            get
+            {
+                if (_metadata == null)
+                {
+                    return "";
+                }
+                AudioMetadata metadata = _metadata as AudioMetadata;
+                return metadata.Title;
+            }
+        }
+
+        #endregion Public Properties
+
+        #region Public Methods
+        public bool CanPreviousExecute()
+        {
+            return true;
+        }
+        public void OnPreviousExecute()
+        {
+
+        }
+
+        public bool CanPlayExecute()
+        {
+            switch (_playerService.PlaybackState)
+            {
+                case PlaybackState.Buffering:
+                    {
+                        return true;
+                    }
+                case PlaybackState.Playing:
+                    {
+                        return true;
+                    }
+                case PlaybackState.Stopped:
+                    {
+                        return false;
+                    }
+            }
+            return false;
+        }
+
+        public void OnPlayExecute()
+        {
+            switch (_playerService.PlaybackState)
+            {
+                case PlaybackState.Buffering:
+                    {
+                        _playerService.Play();
+                        break;
+                    }
+                case PlaybackState.Playing:
+                    {
+                        _playerService.Pause();
+                        break;
+                    }
+            }
+        }
+
+        public bool CanNextExecute()
+        {
+            return true;
+        }
+
+        public void OnNextExecute()
+        {
+
+        }
+
+        #endregion public Methods
+
+        #region EventHandlers
+        /// <summary>
+        /// PlayerService playback state changed event handler.
+        /// </summary>
+        /// <param name="sender">The sending object.</param>
+        /// <param name="args">Event arguments.</param>
+        public void OnPlaybackStateChanged(object sender, PlaybackStateChangedEventArgs args)
+        {
+            OnPropertyChanged("PlayButtonText");
+            PlayCommand.ChangeCanExecute();
+            NextCommand.ChangeCanExecute();
+            PreviousCommand.ChangeCanExecute();
+        }
+
+        /// <summary>
+        /// PlayerService media changed event handler.
+        /// </summary>
+        /// <param name="sender">The sending object.</param>
+        /// <param name="args">Event arguments.</param>
+        public void OnMediaChanged(object sender, MediaChangedEventArgs args)
+        {
+            _metadata = args.NewMetadata;
+            OnPropertyChanged("ArtistName");
+            OnPropertyChanged("SongTitle");
+        }
+        #endregion EventHandlers
+    }
+}