First pass at songs view

Using data grid for songs view. Added FileSystemUtil for async folder traversal

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch",
+            "type": "xamarin",
+            "request": "launch",
+            "package": "com.your.app.package",
+            "intent": ""
+        }
+    ]
+}

Aurora.gtk/Aurora.gtk.csproj

@@ -64,6 +64,23 @@
     <Reference Include="Xamarin.Forms.Platform.GTK">
       <HintPath>..\packages\Xamarin.Forms.Platform.GTK.3.6.0.344457\lib\net45\Xamarin.Forms.Platform.GTK.dll</HintPath>
     </Reference>
+    <Reference Include="System.Reflection">
+      <HintPath>..\packages\System.Reflection.4.3.0\lib\net462\System.Reflection.dll</HintPath>
+    </Reference>
+    <Reference Include="mscorlib" />
+    <Reference Include="System.Reflection.TypeExtensions">
+      <HintPath>..\packages\System.Reflection.TypeExtensions.4.4.0\lib\net461\System.Reflection.TypeExtensions.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Serialization.Primitives">
+      <HintPath>..\packages\System.Runtime.Serialization.Primitives.4.3.0\lib\net46\System.Runtime.Serialization.Primitives.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Serialization" />
+    <Reference Include="taglib-sharp">
+      <HintPath>..\packages\taglib-sharp-netstandard2.0.2.1.0\lib\netstandard2.0\taglib-sharp.dll</HintPath>
+    </Reference>
+    <Reference Include="Xamarin.Forms.DataGrid">
+      <HintPath>..\packages\Xamarin.Forms.DataGrid.3.1.0\lib\netstandard2.0\Xamarin.Forms.DataGrid.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="gtk-gui\gui.stetic">

Aurora.gtk/packages.config

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="System.Reflection" version="4.3.0" targetFramework="net47" />
+  <package id="System.Reflection.TypeExtensions" version="4.4.0" targetFramework="net47" />
+  <package id="System.Runtime.Serialization.Primitives" version="4.3.0" targetFramework="net47" />
+  <package id="taglib-sharp-netstandard2.0" version="2.1.0" targetFramework="net47" />
   <package id="Xamarin.Forms" version="3.6.0.344457" targetFramework="net47" />
+  <package id="Xamarin.Forms.DataGrid" version="3.1.0" targetFramework="net47" />
   <package id="Xamarin.Forms.Platform.GTK" version="3.6.0.344457" targetFramework="net47" />
 </packages>

Aurora/Aurora.csproj

@@ -13,6 +13,8 @@
   <ItemGroup>
     <PackageReference Include="Xamarin.Forms" Version="3.6.0.264807" />
     <PackageReference Include="Xamarin.Essentials" Version="1.0.1" />
+    <PackageReference Include="Xamarin.Forms.DataGrid" Version="3.1.0" />
+    <PackageReference Include="taglib-sharp-netstandard2.0" Version="2.1.0" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Frontend\" />

Aurora/Frontend/Models/Song.cs

@@ -0,0 +1,41 @@
+using System;
+
+namespace Aurora.Frontend.Views.Songs
+{
+    public class Song
+    {
+        public Song()
+        {
+        }
+
+        /// <summary>
+        /// The title of the song.
+        /// </summary>
+        /// <value></value>
+        public string Title { get; set; }
+
+        /// <summary>
+        /// The artist of the song.
+        /// </summary>
+        /// <value></value>
+        public string Artist { get; set; }
+
+        /// <summary>
+        /// The album from which the song belongs.
+        /// </summary>
+        /// <value></value>
+        public string Album { get; set; }
+
+        /// <summary>
+        /// The duration of the song.
+        /// </summary>
+        /// <value></value>
+        public string Duration { get; set; }
+
+        /// <summary>
+        /// Extra data associated with a song.
+        /// </summary>
+        /// <value></value>
+        public object Metadata { get; set; }
+    }
+}

Aurora/Frontend/Utils/FileSystemUtils.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Aurora.Frontend.Utils
+{
+    public class FileSystemUtils
+    {
+
+        public FileSystemUtils()
+        {
+        }
+
+
+        /// <summary>
+        /// Asynchronousely recursively traverse a directory path.
+        /// </summary>
+        /// <param name="path">The path to the directory to traverse</param>
+        /// <param name="extensions">Comma separated list of file extensions to accept</param>
+        public static List<FileInfo> TraverseFoldersAsync(string path, string extensions)
+        {
+            string[] extensionList = extensions.Split(',');
+
+            ConcurrentBag<Task> tasks = new ConcurrentBag<Task>();
+            List<FileInfo> outFiles = new List<FileInfo>();
+            DirectoryInfo directoryInfo = new DirectoryInfo(path);
+
+            tasks.Add(Task.Run(() => Traverse(directoryInfo, tasks, outFiles, extensionList)));
+
+            Task waitingTask;
+            while (tasks.TryTake(out waitingTask))
+            {
+                waitingTask.Wait();
+            }
+
+            return outFiles;
+        }
+
+
+
+        /// <summary>
+        /// Recursive method to capture children of a directory.
+        /// </summary>
+        /// <param name="dir">The directory to traverse</param>
+        /// <param name="tasks">The list of currently running tasks</param>
+        private static void Traverse(DirectoryInfo dir, ConcurrentBag<Task> tasks, List<FileInfo> outFiles, string[] extensions)
+        {
+            try
+            {
+                DirectoryInfo[] directoryInfos = dir.GetDirectories();
+                //Enque children
+                foreach (DirectoryInfo childInfo in directoryInfos)
+                {
+                    tasks.Add(Task.Run(() => Traverse(childInfo, tasks, outFiles, extensions)));
+                }
+
+                //Collect files
+                foreach (FileInfo fileInfo in dir.GetFiles())
+                {
+                    if (extensions.Any(e => e == fileInfo.Extension))
+                    {
+                        //Don't know if this lock is necessary
+                        lock (outFiles)
+                        {
+                            outFiles.Add(fileInfo);
+                        }
+                    }
+
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"{ex.GetType()} {ex.Message}\n{ex.StackTrace}");
+                ex = ex.InnerException;
+            }
+        }
+
+    }
+}

Aurora/Frontend/Views/Songs/SongsView.xaml

@@ -1,6 +1,38 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="Aurora.Frontend.Views.Songs.SongsView">
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:dg="clr-namespace:Xamarin.Forms.DataGrid;assembly=Xamarin.Forms.DataGrid"
+             x:Class="Aurora.Frontend.Views.Songs.SongsView">
     <ContentPage.Content>
-        <Label Text="Songs" />
+        <dg:DataGrid ItemsSource="{Binding SongsList}" SelectionEnabled="True" SelectedItem="{Binding SelectedSong}"
+               RowHeight="30" HeaderHeight="50" BorderColor="#CCCCCC" HeaderBackground="#E0E6F8">
+            
+            <!-- Header -->
+            <dg:DataGrid.HeaderFontSize>
+                <OnIdiom x:TypeArguments="x:Double">
+                    <OnIdiom.Tablet>15</OnIdiom.Tablet>
+                    <OnIdiom.Phone>13</OnIdiom.Phone>
+                    <OnIdiom.Desktop>20</OnIdiom.Desktop>
+                </OnIdiom>
+            </dg:DataGrid.HeaderFontSize>
+
+            <!-- Columns -->
+            <dg:DataGrid.Columns>
+                <dg:DataGridColumn Title="Title" PropertyName="Title" Width="2*"/>
+                <dg:DataGridColumn Title="Album" PropertyName="Album" Width="0.95*"/>
+                <dg:DataGridColumn Title="Artist" PropertyName="Artist"  Width="1*"/>
+                <dg:DataGridColumn Title="Duration" PropertyName="Duration"/>
+            </dg:DataGrid.Columns>
+
+            <!-- Row Colors -->
+            <dg:DataGrid.RowsBackgroundColorPalette>
+                <dg:PaletteCollection>
+                    <Color>#F2F2F2</Color>
+                    <Color>#FFFFFF</Color>
+                </dg:PaletteCollection>
+            </dg:DataGrid.RowsBackgroundColorPalette>
+
+            
+        </dg:DataGrid>
     </ContentPage.Content>
 </ContentPage>

Aurora/Frontend/Views/Songs/SongsView.xaml.cs

@@ -10,6 +10,7 @@ namespace Aurora.Frontend.Views.Songs
         public SongsView()
         {
             InitializeComponent();
+            BindingContext = new SongsViewModel();
         }
     }
 }

Aurora/Frontend/Views/Songs/SongsViewModel.cs

@@ -1,10 +1,77 @@
 using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.IO;
+using Aurora.Frontend.Utils;
+
 namespace Aurora.Frontend.Views.Songs
 {
-    public class SongsViewModel
+    public class SongsViewModel : BaseViewModel
     {
+        #region Fields
+        private string _pathName = "/Users/brandonwatson/Music/iTunes/iTunes Media/Music";
+        private string _extensions = ".wav,.mp3,.aiff,.flac,.m4a,.m4b,.wma";
+        private ObservableCollection<Song> _songsList;
+        private Song _selectedSong;
+
+        #endregion Fields
+
+        #region Constructor
         public SongsViewModel()
         {
+            _songsList = new ObservableCollection<Song>();
+            Initialize();
         }
+
+        #endregion Constructor
+
+        #region Properties
+        public ObservableCollection<Song> SongsList
+        {
+            get { return _songsList; }
+            set
+            {
+                if (value != _songsList)
+                {
+                    _songsList = value;
+                    OnPropertyChanged("SongList");
+                }
+            }
+        }
+
+        public Song SelectedSong
+        {
+            get { return _selectedSong; }
+            set
+            {
+                if (value != _selectedSong)
+                {
+                    _selectedSong = value;
+                    OnPropertyChanged("SelectedSong");
+                }
+            }
+        }
+
+        #endregion Properties
+
+        #region Methods
+        public void Initialize()
+        {
+            List<FileInfo> musicFiles = FileSystemUtils.TraverseFoldersAsync(_pathName, _extensions);
+
+            foreach (FileInfo file in musicFiles)
+            {
+                TagLib.File tagFile = TagLib.File.Create(file.FullName);
+                _songsList.Add(new Song()
+                {
+                    Title = tagFile.Tag.Title,
+                    Album = tagFile.Tag.Album,
+                    Artist = tagFile.Tag.FirstAlbumArtist
+                });
+            }
+        }
+
+        #endregion Methods
+
     }
 }

aurora.code-workspace

@@ -0,0 +1,7 @@
+{
+	"folders": [
+		{
+			"path": "."
+		}
+	]
+}