Enforce register in interface

swing/src/net/sf/openrocket/gui/configdialog/AppearancePanel.java

@@ -65,7 +65,7 @@ import net.sf.openrocket.util.ORColor;
 import net.sf.openrocket.util.StateChangeListener;
 import net.sf.openrocket.gui.widgets.SelectColorButton;
 
-public class AppearancePanel extends JPanel implements Invalidatable {
+public class AppearancePanel extends JPanel implements Invalidatable, InvalidatingWidget {
 	private static final long serialVersionUID = 2709187552673202019L;
 
 	private static final Translator trans = Application.getTranslator();
@@ -776,7 +776,8 @@ public class AppearancePanel extends JPanel implements Invalidatable {
 		});
 	}
 
-	protected void register(Invalidatable model) {
+	@Override
+	public void register(Invalidatable model) {
 		this.invalidatables.add(model);
 	}
 

swing/src/net/sf/openrocket/gui/configdialog/InstancesPanel.java

@@ -29,7 +29,7 @@ import java.util.List;
 /**
  * Panel for configuring a component's duplication instances.
  */
-public class InstancesPanel extends JPanel implements Invalidatable {
+public class InstancesPanel extends JPanel implements Invalidatable, InvalidatingWidget {
     private static final Translator trans = Application.getTranslator();
     private final List<Invalidatable> invalidatables = new ArrayList<>();
 
@@ -64,7 +64,8 @@ public class InstancesPanel extends JPanel implements Invalidatable {
         }
     }
 
-    protected void register(Invalidatable model) {
+    @Override
+    public void register(Invalidatable model) {
         this.invalidatables.add(model);
     }
 

swing/src/net/sf/openrocket/gui/configdialog/InvalidatingWidget.java

@@ -0,0 +1,11 @@
+package net.sf.openrocket.gui.configdialog;
+
+import net.sf.openrocket.util.Invalidatable;
+
+public interface InvalidatingWidget {
+	/**
+	 * Register a model to be invalidated when this widget is invalidated.
+	 * @param model the model to register
+	 */
+	void register(Invalidatable model);
+}

swing/src/net/sf/openrocket/gui/configdialog/MaterialPanel.java

@@ -27,7 +27,7 @@ import java.util.List;
 /**
  * Panel for configuring a component's material and finish properties.
  */
-public class MaterialPanel extends JPanel implements Invalidatable {
+public class MaterialPanel extends JPanel implements Invalidatable, InvalidatingWidget {
     private static final Translator trans = Application.getTranslator();
     private final List<Invalidatable> invalidatables = new ArrayList<>();
 
@@ -108,7 +108,8 @@ public class MaterialPanel extends JPanel implements Invalidatable {
                 trans.get("MaterialPanel.lbl.ComponentFinish"), "Material", order);
     }
 
-    protected void register(Invalidatable model) {
+    @Override
+    public void register(Invalidatable model) {
         this.invalidatables.add(model);
     }
 

swing/src/net/sf/openrocket/gui/configdialog/MotorConfig.java

@@ -31,7 +31,7 @@ import net.sf.openrocket.startup.Application;
 import net.sf.openrocket.unit.UnitGroup;
 import net.sf.openrocket.util.Invalidatable;
 
-public class MotorConfig extends JPanel implements Invalidatable {
+public class MotorConfig extends JPanel implements Invalidatable, InvalidatingWidget {
 	
 	private static final long serialVersionUID = -4974509134239867067L;
 	private final MotorMount mount;
@@ -144,7 +144,8 @@ public class MotorConfig extends JPanel implements Invalidatable {
 		}
 	}
 
-	protected void register(Invalidatable model) {
+	@Override
+	public void register(Invalidatable model) {
 		this.invalidatables.add(model);
 	}
 

swing/src/net/sf/openrocket/gui/configdialog/PlacementPanel.java

@@ -28,7 +28,7 @@ import java.util.List;
 /**
  * Panel for configuring a component's placement relative to its parent.
  */
-public class PlacementPanel extends JPanel implements Invalidatable {
+public class PlacementPanel extends JPanel implements Invalidatable, InvalidatingWidget {
     private static final Translator trans = Application.getTranslator();
     private final List<Invalidatable> invalidatables = new ArrayList<>();
 
@@ -69,7 +69,8 @@ public class PlacementPanel extends JPanel implements Invalidatable {
                 "w 100lp");
     }
 
-    protected void register(Invalidatable model) {
+    @Override
+    public void register(Invalidatable model) {
         this.invalidatables.add(model);
     }
 

swing/src/net/sf/openrocket/gui/configdialog/RocketComponentConfig.java

@@ -62,7 +62,7 @@ import net.sf.openrocket.startup.Preferences;
 import net.sf.openrocket.unit.UnitGroup;
 import net.sf.openrocket.util.Invalidatable;
 
-public class RocketComponentConfig extends JPanel {
+public class RocketComponentConfig extends JPanel implements InvalidatingWidget {
 	private static final long serialVersionUID = -2925484062132243982L;
 
 	private static final Translator trans = Application.getTranslator();
@@ -1004,8 +1004,8 @@ public class RocketComponentConfig extends JPanel {
 		}
 	}
 	
-	
+	@Override
-	protected void register(Invalidatable model) {
+	public void register(Invalidatable model) {
 		this.invalidatables.add(model);
 	}