Fix label management to close #406

src/main/java/com/shootoff/camera/CameraManager.java

@@ -134,25 +134,25 @@ public DeduplicationProcessor getDeduplicationProcessor() {
 		return deduplicationProcessor;
 	}
 
-	public CameraManager(Camera webcam, CameraErrorView cameraErrorView, CameraView canvas, Configuration config) {
+	public CameraManager(Camera webcam, CameraErrorView cameraErrorView, CameraView view, Configuration config) {
 		this.webcam = Optional.of(webcam);
 		this.cameraErrorView = Optional.ofNullable(cameraErrorView);
-		this.cameraView = canvas;
+		this.cameraView = view;
 		this.config = config;
 
 		this.cameraView.setCameraManager(this);
 
 		initDetector(new Detector());
 
-		this.shotDetectionManager = new ShotDetectionManager(this, config, canvas);
+		this.shotDetectionManager = new ShotDetectionManager(this, config, view);
 	}
 
-	protected CameraManager(CameraView canvas, Configuration config) {
+	protected CameraManager(CameraView view, Configuration config) {
 		this.webcam = Optional.empty();
 		this.cameraErrorView = Optional.empty();
-		this.cameraView = canvas;
+		this.cameraView = view;
 		this.config = config;
-		this.shotDetectionManager = new ShotDetectionManager(this, config, canvas);
+		this.shotDetectionManager = new ShotDetectionManager(this, config, view);
 	}
 
 	private void initDetector(Detector detector) {

src/main/java/com/shootoff/camera/CameraView.java

@@ -7,10 +7,13 @@
 import com.shootoff.gui.Target;
 
 import javafx.geometry.Bounds;
+import javafx.scene.Node;
 import javafx.scene.control.Label;
 import javafx.scene.paint.Color;
 
 public interface CameraView {
+	public boolean addChild(Node c);
+
 	public void addShot(Color color, double x, double y);
 
 	public Optional<Target> addTarget(File targetFile);
@@ -23,6 +26,8 @@ public interface CameraView {
 
 	public void close();
 
+	public boolean removeChild(Node c);
+
 	public void removeDiagnosticMessage(Label diagnosticLabel);
 
 	public void reset();

src/main/java/com/shootoff/camera/CamerasSupervisor.java

@@ -104,13 +104,13 @@ public CameraManager getCameraManager(final int index) {
 	}
 
 	public List<CameraView> getCameraViews() {
-		final List<CameraView> canvasManagers = new ArrayList<CameraView>();
+		final List<CameraView> cameraViews = new ArrayList<CameraView>();
 
 		for (final CameraManager manager : managers) {
-			canvasManagers.add(manager.getCameraView());
+			cameraViews.add(manager.getCameraView());
 		}
 
-		return canvasManagers;
+		return cameraViews;
 	}
 
 	public CameraView getCameraView(final int index) {

src/main/java/com/shootoff/gui/CanvasManager.java

@@ -165,6 +165,16 @@ public CameraManager getCameraManager() {
 		return cameraManager;
 	}
 
+	@Override
+	public boolean addChild(Node c) {
+		return getCanvasGroup().getChildren().add(c);
+	}
+
+	@Override
+	public boolean removeChild(Node c) {
+		return getCanvasGroup().getChildren().remove(c);
+	}
+
 	public Label addDiagnosticMessage(final String message, final long chimeDelay, final Color backgroundColor) {
 		final Label diagnosticLabel = new Label(message);
 		diagnosticLabel.setStyle("-fx-background-color: " + colorToWebCode(backgroundColor));

src/main/java/com/shootoff/gui/controller/ShootOFFController.java

@@ -606,9 +606,9 @@ public void registerExercise(TrainingExercise exercise) {
 				}
 
 				TrainingExercise newExercise = (TrainingExercise) ctor.newInstance(knownTargets);
+				config.setExercise(newExercise);
 				((TrainingExerciseBase) newExercise).init(config, camerasSupervisor, this);
 				newExercise.init();
-				config.setExercise(newExercise);
 			} catch (Exception ex) {
 				ex.printStackTrace();
 			}

src/main/java/com/shootoff/plugins/TrainingExerciseBase.java

@@ -44,7 +44,6 @@
 import com.shootoff.camera.CameraView;
 import com.shootoff.camera.CamerasSupervisor;
 import com.shootoff.config.Configuration;
-import com.shootoff.gui.CanvasManager;
 import com.shootoff.gui.DelayedStartListener;
 import com.shootoff.gui.ParListener;
 import com.shootoff.gui.ShotEntry;
@@ -92,7 +91,7 @@ public class TrainingExerciseBase {
 	private TableView<ShotEntry> shotTimerTable;
 	private boolean changedRowColor = false;
 
-	private final static Map<CanvasManager, Label> exerciseLabels = new HashMap<CanvasManager, Label>();
+	private final static Map<CameraView, Label> exerciseLabels = new HashMap<CameraView, Label>();
 	private final static Map<String, TableColumn<ShotEntry, String>> exerciseColumns = new HashMap<String, TableColumn<ShotEntry, String>>();
 	private final static List<Button> exerciseButtons = new ArrayList<Button>();
 
@@ -119,12 +118,10 @@ public void init(final Configuration config, final CamerasSupervisor camerasSupe
 		this.shotTimerTable = shotEntryTable;
 
 		for (final CameraView cv : camerasSupervisor.getCameraViews()) {
-			final CanvasManager cm = (CanvasManager) cv;
-
 			final Label exerciseLabel = new Label();
 			exerciseLabel.setTextFill(Color.WHITE);
-			cm.getCanvasGroup().getChildren().add(exerciseLabel);
-			exerciseLabels.put(cm, exerciseLabel);
+			cv.addChild(exerciseLabel);
+			exerciseLabels.put(cv, exerciseLabel);
 		}
 	}
 
@@ -271,8 +268,9 @@ public void showTextOnFeed(String message) {
 		}
 
 		Platform.runLater(() -> {
-			for (Label exerciseLabel : exerciseLabels.values())
+			for (Label exerciseLabel : exerciseLabels.values()) {
 				exerciseLabel.setText(message);
+			}
 		});
 	}
 
@@ -383,7 +381,7 @@ private static void playSound(AudioInputStream audioInputStream, Optional<LineLi
 		final DataLine.Info info = new DataLine.Info(Clip.class, format);
 
 		Clip clip = null;
-		
+
 		try {
 			clip = (Clip) AudioSystem.getLine(info);
 			clip.open(audioInputStream);
@@ -454,16 +452,17 @@ public void destroy() {
 		}
 
 		if (shotTimerTable != null) {
-			for (final TableColumn<ShotEntry, String> column : exerciseColumns.values()) {
+			for (TableColumn<ShotEntry, String> column : exerciseColumns.values()) {
 				shotTimerTable.getColumns().remove(column);
 			}
 		}
 
 		for (final CameraView cv : camerasSupervisor.getCameraViews()) {
-			final CanvasManager cm = (CanvasManager) cv;
-			cm.getCanvasGroup().getChildren().remove(exerciseLabels.get(cm));
+			cv.removeChild(exerciseLabels.get(cv));
 		}
 
+		exerciseLabels.clear();
+
 		final Iterator<Button> itExerciseButtons = exerciseButtons.iterator();
 
 		while (itExerciseButtons.hasNext()) {
@@ -472,8 +471,6 @@ public void destroy() {
 			itExerciseButtons.remove();
 		}
 
-		exerciseLabels.clear();
-
 		pauseShotDetection(false);
 	}