Added popup menu on right click to remove items from the playlist.

src/main/java/musicplayer/PlayerGUI.form

@@ -15,26 +15,10 @@
           </grid>
         </constraints>
         <properties>
-          <dividerLocation value="350"/>
+          <dividerLocation value="240"/>
         </properties>
         <border type="none"/>
         <children>
-          <scrollpane id="2b209">
-            <constraints>
-              <splitpane position="left"/>
-            </constraints>
-            <properties/>
-            <border type="none"/>
-            <children>
-              <component id="6b9fd" class="javax.swing.JTree" binding="libraryView">
-                <constraints/>
-                <properties>
-                  <rootVisible value="true"/>
-                  <showsRootHandles value="false"/>
-                </properties>
-              </component>
-            </children>
-          </scrollpane>
           <scrollpane id="359a1">
             <constraints>
               <splitpane position="right"/>
@@ -50,6 +34,33 @@
               </component>
             </children>
           </scrollpane>
+          <grid id="1f7af" layout-manager="BorderLayout" hgap="0" vgap="0">
+            <constraints>
+              <splitpane position="left"/>
+            </constraints>
+            <properties/>
+            <border type="none"/>
+            <children>
+              <component id="c14a2" class="javax.swing.JComboBox" binding="libraryDisplayType">
+                <constraints border-constraint="North"/>
+                <properties/>
+              </component>
+              <scrollpane id="2b209">
+                <constraints border-constraint="Center"/>
+                <properties/>
+                <border type="none"/>
+                <children>
+                  <component id="6b9fd" class="javax.swing.JTree" binding="libraryView">
+                    <constraints/>
+                    <properties>
+                      <rootVisible value="true"/>
+                      <showsRootHandles value="false"/>
+                    </properties>
+                  </component>
+                </children>
+              </scrollpane>
+            </children>
+          </grid>
         </children>
       </splitpane>
       <component id="98c55" class="javax.swing.JSlider" binding="seekBar">

src/main/java/musicplayer/PlayerGUI.java

@@ -22,9 +22,12 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
     private JSlider seekBar;
     private JSlider volumeSlider;
     private JMenuBar menuBar;
+    private JComboBox libraryDisplayType;
     private Player player = new Player(this);
     private PlaylistTableModel playlistTableModel = new PlaylistTableModel(new ArrayList<>());
 
+    private Map<String, Runnable> libraryDisplayVariants = createDisplayVariantMap();
+
 
     public static void main(String[] args) {
         JFrame frame = new JFrame();
@@ -58,7 +61,7 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
 
         //Action Listeners
         playButton.addActionListener(e -> {
-            if (playList.getSelectedColumn() == -1) {
+            if (playList.getRowCount() > 0) {
                 player.playSong(playlistTableModel.getFirst().get());
             }
         });
@@ -67,8 +70,9 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
         stopButton.addActionListener(e -> player.stop());
         nextButton.addActionListener(e -> playNextSong());
         volumeSlider.addChangeListener(e -> player.setVolume(((JSlider)e.getSource()).getValue()));
-
+        playList.setComponentPopupMenu(createPlaylistPopup());
         populateMenuBar();
+        refreshLibrary();
     }
 
     /**
@@ -230,4 +234,20 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
         menuBar.add(tools);
 
     }
+
+    private JPopupMenu createPlaylistPopup(){
+        JPopupMenu popupMenu = new JPopupMenu();
+        JMenuItem menuItem = new JMenuItem("Remove");
+        menuItem.addActionListener((e) -> playlistTableModel.removeSong(playList.getSelectedRows()));
+
+        popupMenu.add(menuItem);
+        return popupMenu;
+    }
+
+    private Map<String, Runnable> createDisplayVariantMap(){
+        Map<String, Runnable> value = new HashMap<>();
+        value.put("Song", () -> Gateway.listAllSongs().get());
+
+        return value;
+    }
 }

src/main/java/musicplayer/PlaylistTableModel.java

@@ -3,8 +3,11 @@ package musicplayer;
 import musicplayer.model.Song;
 
 import javax.swing.table.AbstractTableModel;
+import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
 
 public class PlaylistTableModel extends AbstractTableModel {
 
@@ -78,4 +81,17 @@ public class PlaylistTableModel extends AbstractTableModel {
     public int getSongIndex(Song song){
         return songList.indexOf(song);
     }
+
+    public void removeSong(int index){
+        if(songList.size() > index && index >= 0){
+            songList.remove(index);
+            fireTableRowsDeleted(index, index);
+        }
+    }
+
+    public void removeSong(int[] index){
+        List<Integer> indices = IntStream.of(index).boxed().collect(Collectors.toList());
+        Collections.reverse(indices);
+        indices.forEach(this::removeSong);
+    }
 }