bugs fix

src/main/java/com/david/midimug/PrimaryController.java

@@ -65,6 +65,7 @@ public void initialize(URL url, ResourceBundle rb) {
     @FXML
     private void openFile() {
         try {
+            SheetUtils.pause();
             File source = LoadFileRenderer.renderMidiChooser();
             AbstractModeController controller = LoadFileRenderer.renderModeChooser();
             GameModeUtils.setGameMode(controller);

src/main/java/com/david/midimug/handler/MidiDevices.java

@@ -18,6 +18,7 @@
 
 import com.david.midimug.gamemode.AbstractModeController;
 import java.util.ArrayList;
+import java.util.prefs.Preferences;
 import javax.sound.midi.MidiDevice;
 import javax.sound.midi.MidiSystem;
 import javax.sound.midi.MidiUnavailableException;
@@ -32,6 +33,7 @@
 public class MidiDevices {
 
     private static MidiDevice selected = null;
+    private static Preferences prefs = Preferences.userNodeForPackage(MidiDevices.class);
 
     public static ArrayList<MidiDevice> getDevices() {
         ArrayList<MidiDevice> devicesList = new ArrayList<>();
@@ -43,6 +45,9 @@ public static ArrayList<MidiDevice> getDevices() {
 
                 // specify hardware MIDI port
                 if (!(device instanceof Sequencer) && !(device instanceof Synthesizer)) {
+                    if(i.getName().equals(prefs.get("SELECTED", "NONE"))){
+                        selectDevice(device);
+                    }
                     devicesList.add(device);
                 }
             } catch (MidiUnavailableException ex) {
@@ -58,6 +63,7 @@ public static void selectDevice(MidiDevice device) throws MidiUnavailableExcepti
         if (selected.isOpen()) {
             selected.close();
         }
+        prefs.put("SELECTED", device.getDeviceInfo().getName());
         selected.open();
     }
 

src/main/java/com/david/midimug/handler/SheetUtils.java

@@ -30,19 +30,21 @@
  */
 public class SheetUtils {
 
-    private static Timeline timeline;
+    private static Timeline timeline = new Timeline();
 
     public static void setupSheet(Pane pane, File source) throws InvalidMidiDataException, IOException {
         Sheet music_sheet = MidiUtils.getSheet(source);
-        timeline = SheetRenderer.renderBarSheet(pane, music_sheet);
+        timeline.stop();
+        timeline.getKeyFrames().clear();
+        SheetRenderer.renderBarSheet(pane, music_sheet, timeline);
     }
 
     public static void play() {
         timeline.play();
     }
 
     public static void pause() {
-        timeline.pause();
+        if(timeline != null) timeline.pause();
     }
 
     public static Duration getCurrentTime() {

src/main/java/com/david/midimug/render/LoadFileRenderer.java

@@ -21,6 +21,7 @@
 import com.david.midimug.gamemode.FluidModeController;
 import com.david.midimug.gamemode.RealModeController;
 import com.david.midimug.gamemode.ShowModeController;
+import com.david.midimug.handler.SheetUtils;
 import java.io.File;
 import java.util.NoSuchElementException;
 import java.util.Optional;

src/main/java/com/david/midimug/render/SheetRenderer.java

@@ -47,7 +47,7 @@ public class SheetRenderer {
 
     private static Pane target;
 
-    public static Timeline renderBarSheet(Pane target, Sheet sheet) {
+    public static void renderBarSheet(Pane target, Sheet sheet, Timeline timeline) {
         SheetRenderer.target = target;
 
         // reset sheet
@@ -59,7 +59,6 @@ public static Timeline renderBarSheet(Pane target, Sheet sheet) {
         target.setClip(clip);
         Color white_key_color = Color.DODGERBLUE;
 
-        Timeline timeline = new Timeline();
         AbstractModeController controller = GameModeUtils.getGameMode();
 
         for (Channel channel : sheet.getChannels()) {
@@ -98,8 +97,6 @@ public static Timeline renderBarSheet(Pane target, Sheet sheet) {
         }
 
         target.getChildren().add(combo);
-
-        return timeline;
     }
 
     private static double computeTick(long tick, Sheet sheet) {

src/main/java/module-info.java

@@ -20,6 +20,7 @@
     requires javafx.fxml;
     requires java.base;
     requires java.desktop;
+    requires java.prefs;
 
     opens com.david.midimug to javafx.fxml;
     exports com.david.midimug;