Working player contained within main page and control delegated to viewmodels

Aurora/Design/Views/MainView/MainView.xaml.cs

@@ -11,8 +11,14 @@ using Aurora.Design.Components.MediaPlayer;
 
 namespace Aurora.Design.Views.Main
 {
+    /// <summary>
+    /// Delegate for updating player metadata
+    /// </summary>
+    /// <param name="media"></param>
+    public delegate void SetPlayerMetadataDelegate(BaseMedia media);
+
     [XamlCompilation(XamlCompilationOptions.Compile)]
-    public partial class MainView : MasterDetailPage
+    public partial class MainView : MasterDetailPage, IDisposable
     {
         private Dictionary<int, BaseViewModel> _viewModels;
         private BaseViewModel _lastViewModel;
@@ -26,16 +32,17 @@ namespace Aurora.Design.Views.Main
 
             Appearing += OnAppearing;
         }
-        ~MainView()
+
+        public void Dispose()
         {
             Appearing -= OnAppearing;
         }
 
-        public Command PlayCommand { get; set; }
-        public Command PreviousCommand { get; set; }
-        public Command NextCommand { get; set; }
-        public BaseMedia Media { get; set; }
-
+        /// <summary>
+        /// Event handler for side bar items being selected
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
         private void OnNavItemSelected(object sender, SelectedItemChangedEventArgs e)
         {
             var item = e.SelectedItem as NavigationItem;
@@ -60,24 +67,22 @@ namespace Aurora.Design.Views.Main
                 //Instantiate new view model
                 vm = (BaseViewModel)Activator.CreateInstance(item.TargetViewModelType);
                 _viewModels.Add(item.Id, vm);
-            }
 
-            //Assign player controls to viewmodel
-            Player player = (Player)ContentPage.FindByName("Player");
-            player.PlayButtonCommand = new Command(vm.PlayExecute, vm.PlayCanExecute);
-            player.NextButtonCommand = new Command(vm.NextExecute, vm.NextCanExecute);
-            player.PreviousButtonCommand = new Command(vm.PreviousExecute, vm.PreviousCanExecute);
-            vm.Media = this.Media;
+            }
 
             //Activate viewmodel
             vm.OnActive();
 
             //Deactivate last viewModel
             _lastViewModel.OnInactive();
+            //Unasign deactivating vm
+            UnassignPlayerControls(_lastViewModel);
 
             //Assign viewModel
             _lastViewModel = vm;
             view.BindingContext = vm;
+            //Assign player controls to viewmodel
+            AssignPlayerControls(vm);
 
             ContentPresenter viewContent = (ContentPresenter)ContentPage.Content.FindByName("ViewContent");
             viewContent.Content = view;
@@ -113,19 +118,50 @@ namespace Aurora.Design.Views.Main
 
             view.BindingContext = vm;
             _lastViewModel = vm;
-            Player player = (Player)ContentPage.FindByName("Player");
-            player.PlayButtonCommand = new Command(vm.PlayExecute, vm.PlayCanExecute);
-            player.NextButtonCommand = new Command(vm.NextExecute, vm.NextCanExecute);
-            player.PreviousButtonCommand = new Command(vm.PreviousExecute, vm.PreviousCanExecute);
-            vm.Media = this.Media;
+            AssignPlayerControls(vm);
             vm.OnActive();
 
+
             ContentPresenter viewContent = (ContentPresenter)ContentPage.Content.FindByName("ViewContent");
             viewContent.Content = view;
 
             MasterPage.ListView.SelectedItem = screenList.FirstOrDefault();
         }
 
+        /// <summary>
+        /// Unassign setplayer delegate to prevent vms from changing player info when inactive
+        /// </summary>
+        /// <param name="vm"></param>
+        private void UnassignPlayerControls(BaseViewModel vm)
+        {
+            vm.SetPlayerMetadata = null;
+        }
+
+        /// <summary>
+        /// Assign main views music player controls to a view model
+        /// </summary>
+        /// <param name="vm">BaseViewModel to assign controls to</param>
+        private void AssignPlayerControls(BaseViewModel vm)
+        {
+            Player player = (Player)ContentPage.FindByName("Player");
+            player.PlayButtonCommand = new Command(vm.OnPlayExecute, vm.CanPlayExecute);
+            player.NextButtonCommand = new Command(vm.OnNextExecute, vm.CanNextExecute);
+            player.PreviousButtonCommand = new Command(vm.OnPreviousExecute, vm.CanPreviousExecute);
+
+            //Assign SetPlayer delegate
+            vm.SetPlayerMetadata = SetPlayerDelegate;
+        }
+
+        private void SetPlayerDelegate(BaseMedia media)
+        {
+            Player player = (Player)ContentPage.FindByName("Player");
+            if (media.Metadata is AudioMetadata)
+            {
+                AudioMetadata meta = (AudioMetadata)media.Metadata;
+                player.ArtistName = meta.Artist;
+                player.SongTitle = meta.Title;
+            }
+        }
     }
 
 }

Aurora/Design/Views/MainView/PageContainer.xaml

@@ -6,7 +6,8 @@
      xmlns:mp="clr-namespace:Aurora.Design.Components.MediaPlayer"
      x:Class="Aurora.Design.Views.MainView.PageContainer">
     <ContentPage.Content>
-        <Grid>
+        <Grid
+             x:Name="Grid">
             <Grid.RowDefinitions>
                 <RowDefinition
                      Height="*"/>