Added indicator of what song is playing in all of the music-type views. Added Queue data structure to prepare for a music queue. #39 #45

Mear/Mear/Views/ArtistView.xaml.cs

@@ -2,11 +2,14 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 
 using Xamarin.Forms;
 using Xamarin.Forms.Xaml;
 
+using Mear.Constants;
+using Mear.Playback;
 using Mear.ViewModels;
 
 namespace Mear.Views
@@ -15,6 +18,9 @@ namespace Mear.Views
 	public partial class ArtistView : ContentPage
 	{
 		#region Fields
+        private StackLayout _playerIndicatorLayout;
+        private Button _controlButton;
+        private Label _songTitleLabel;
 		private ArtistViewModel _viewModel;
 		#endregion
 
@@ -27,6 +33,8 @@ namespace Mear.Views
 		public ArtistView()
 		{
 			InitializeComponent();
+            AddPlayerIndicator();
+            BackgroundControl();
 
 			BindingContext = _viewModel = new ArtistViewModel();
 		}
@@ -34,7 +42,86 @@ namespace Mear.Views
 
 
 		#region Methods
-		#region Events
+        private async Task AddPlayerIndicator()
+        {
+            var mainLayout = ArtistViewMainLayout;
+            if (_playerIndicatorLayout == null)
+            {
+                _playerIndicatorLayout = await ConfigureSongIndicatorLayout();
+            }
+
+            mainLayout.Children.Add(_playerIndicatorLayout);
+        }
+        private async Task<StackLayout> ConfigureSongIndicatorLayout()
+        {
+            var indicatorLayout = new StackLayout();
+            indicatorLayout.Orientation = StackOrientation.Horizontal;
+            indicatorLayout.Padding = 5;
+            _controlButton = new Button();
+            _controlButton.Clicked += ControlButton_Clicked;
+            _songTitleLabel = new Label();
+            _songTitleLabel.HorizontalOptions = LayoutOptions.Center;
+            _songTitleLabel.VerticalOptions = LayoutOptions.Start;
+            var isSongPlayer = MearPlayer.IsPlaying();
+
+            if (isSongPlayer)
+            {
+                _controlButton.Text = "P";
+                _songTitleLabel.Text = await MearPlayer.SongTitle();
+            }
+            else
+            {
+                _controlButton.Text = "S";
+                _songTitleLabel.Text = string.Empty;
+            }
+
+            indicatorLayout.Children.Add(_controlButton);
+            indicatorLayout.Children.Add(_songTitleLabel);
+
+            return indicatorLayout;
+        }
+
+        #region Background
+        private async Task BackgroundControl()
+        {
+            try
+            {
+                new Thread(async () =>
+                {
+                    while (true)
+                    {
+                        Device.BeginInvokeOnMainThread(async () =>
+                        {
+                            if (MearPlayer.SongHasBeenChanged(MearPlayer.MusicViews.Artist))
+                            {
+                                _songTitleLabel.Text = MearPlayer.SongTitle().Result;
+                                MearPlayer.ResetSongChange(MearPlayer.MusicViews.Artist);
+                            }
+                        });
+                        await Task.Delay(800);
+                    }
+                }).Start();
+            }
+            catch (Exception ex)
+            {
+                var msg = ex.Message;
+            }
+        }
+        #endregion
+
+        #region Events
+        private async void ControlButton_Clicked(object sender, EventArgs e)
+        {
+            if (MearPlayer.IsPlaying())
+            {
+                MearPlayer.ControlMusic(null, PlayControls.PAUSE);
+            }
+            else
+            {
+                MearPlayer.ControlMusic(null, PlayControls.RESUME);
+            }
+        }
+
 		private void ArtistListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
 		{
             var artistItem = (sender as ListView).SelectedItem = null;