Added library display variant selection and application.

src/main/java/musicplayer/PlayerGUI.form

@@ -19,7 +19,7 @@
         </properties>
         <border type="none"/>
         <children>
-          <scrollpane id="359a1">
+          <scrollpane id="359a1" binding="playlistScroll">
             <constraints>
               <splitpane position="right"/>
             </constraints>

src/main/java/musicplayer/PlayerGUI.java

@@ -26,6 +26,7 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
     private JMenuBar menuBar;
     private JComboBox libraryDisplayType;
     private JLabel volumeValue;
+    private JScrollPane playlistScroll;
     private Player player = new Player(this);
     private PlaylistTableModel playlistTableModel = new PlaylistTableModel(new ArrayList<>());
 
@@ -48,6 +49,7 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
         libraryView.setCellRenderer(new LibraryTreeCellRenderer());
         playList.setModel(playlistTableModel);
         resetTree();
+        libraryDisplayVariants.keySet().forEach(libraryDisplayType::addItem);
         volumeSlider.setValue(player.getVolume());
         setVolumeValue(player.getVolume());
         Thread seekBarUpdater = new Thread(() -> {
@@ -64,6 +66,10 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
         seekBarUpdater.start();
 
         //Action Listeners
+        libraryDisplayType.addItemListener(e ->{
+            if(e.getStateChange() == ItemEvent.SELECTED)
+                libraryDisplayVariants.get(libraryDisplayType.getSelectedItem().toString()).run();
+        });
         playButton.addActionListener(e -> {
             if (playList.getRowCount() > 0) {
                 if(playList.getSelectedRowCount() > 0)
@@ -81,6 +87,7 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
             setVolumeValue(player.getVolume());
         });
         playList.setComponentPopupMenu(createPlaylistPopup());
+        playlistScroll.setComponentPopupMenu(createPlaylistEmptyAreaPopup());
         populateMenuBar();
         refreshLibrary();
     }
@@ -105,9 +112,10 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
      * @param libraryData Map of albums with a lists of associated songs.
      */
     private void populateLibrary(Map<Album, List<Song>> libraryData) {
+        TreeMap<Album, List<Song>> sortedData = new TreeMap<>(libraryData);
         DefaultTreeModel model = new DefaultTreeModel(new DefaultMutableTreeNode());
         DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) model.getRoot();
-        libraryData.forEach((k, v) -> {
+        sortedData.forEach((k, v) -> {
             DefaultMutableTreeNode albumNode = new DefaultMutableTreeNode(k);
             addNodeToTreeModel(model, parentNode, albumNode);
             new TreeSet<>(v).forEach(x -> addNodeToTreeModel(model, albumNode, new DefaultMutableTreeNode(x)));
@@ -120,6 +128,7 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
      * @param libraryData List of songs.
      */
     private void populateLibrary(List<Song> libraryData) {
+        Collections.sort(libraryData);
         DefaultTreeModel model = new DefaultTreeModel(new DefaultMutableTreeNode());
         DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) model.getRoot();
         libraryData.forEach(x -> addNodeToTreeModel(model, parentNode, new DefaultMutableTreeNode(x)));
@@ -195,9 +204,7 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
         addNodeToTreeModel(model, parentNode, newNode);
         libraryView.setModel(model);
         Thread populateThread = new Thread(() -> {
-            TreeMap treeMap = new TreeMap<>(Gateway.listAllSongsGroupedByAlbum().get());
+            libraryDisplayVariants.get(libraryDisplayType.getSelectedItem().toString()).run();
-            //SwingUtilities.invokeLater(() -> populateLibrary(treeMap));
-            populateLibrary(treeMap);
         });
         populateThread.start();
     }
@@ -259,9 +266,19 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
         return popupMenu;
     }
 
+    private JPopupMenu createPlaylistEmptyAreaPopup(){
+        JPopupMenu popupMenu = new JPopupMenu();
+        JMenuItem menuItem = new JMenuItem("Clear all");
+        menuItem.addActionListener((e) -> playlistTableModel.removeAll());
+
+        popupMenu.add(menuItem);
+        return popupMenu;
+    }
+
     private Map<String, Runnable> createDisplayVariantMap(){
         Map<String, Runnable> value = new HashMap<>();
-        value.put("Song", () -> Gateway.listAllSongs().get());
+        value.put("Song", () -> Gateway.listAllSongs().ifPresent(this::populateLibrary));
+        value.put("Album/Song", () -> Gateway.listAllSongsGroupedByAlbum().ifPresent(this::populateLibrary));
 
         return value;
     }

src/main/java/musicplayer/PlaylistTableModel.java

@@ -100,6 +100,11 @@ public class PlaylistTableModel extends AbstractTableModel {
         fireTableDataChanged();
     }
 
+    public void removeAll(){
+        songList.clear();
+        fireTableDataChanged();
+    }
+
     public Optional<Song> getSong(int index){
         return songList.size() > 0 && index >= 0 && index < songList.size() ? Optional.of(songList.get(index)) : Optional.empty();
     }