Finished dark design and implementing important Components

src/main/java/org/openautonomousconnection/oacswing/component/OACMenu.java

@@ -4,10 +4,18 @@
 
 package org.openautonomousconnection.oacswing.component;
 
+import org.openautonomousconnection.oacswing.component.design.DesignManager;
+
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.ContainerAdapter;
+import java.awt.event.ContainerEvent;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
 
 public class OACMenu extends JMenu implements OACComponent {
+    private JPopupMenu observedPopup;
+
     public OACMenu() {
         super();
     }
@@ -24,6 +32,61 @@ public class OACMenu extends JMenu implements OACComponent {
         super(s, b);
     }
 
+    @Override
+    public void init() {
+        applyDesignColors();
+        setOpaque(true);
+        installPopupAutoApply();
+    }
+
+    @Override
+    public void updateUI() {
+        super.updateUI();
+        applyDesignColors();
+        installPopupAutoApply();
+    }
+
+    private void applyDesignColors() {
+        setBackground(DesignManager.resolveBackground(OACMenu.class, getBackground()));
+        setForeground(DesignManager.resolveForeground(OACMenu.class, getForeground()));
+        applyPopupDesign();
+    }
+
+    private void installPopupAutoApply() {
+        JPopupMenu popup = getPopupMenu();
+        if (observedPopup == popup) {
+            return;
+        }
+        popup.addContainerListener(new ContainerAdapter() {
+            @Override
+            public void componentAdded(ContainerEvent e) {
+                applyPopupDesign();
+            }
+        });
+        popup.addComponentListener(new ComponentAdapter() {
+            @Override
+            public void componentShown(ComponentEvent e) {
+                applyPopupDesign();
+            }
+        });
+        observedPopup = popup;
+    }
+
+    private void applyPopupDesign() {
+        JPopupMenu popup = getPopupMenu();
+        popup.setBackground(DesignManager.resolveBackground(OACPopupMenu.class, popup.getBackground()));
+        popup.setForeground(DesignManager.resolveForeground(OACPopupMenu.class, popup.getForeground()));
+        for (Component child : popup.getComponents()) {
+            if (child instanceof OACComponent oac) {
+                oac.initDesign();
+            } else if (child instanceof JComponent jc) {
+                jc.setOpaque(true);
+                jc.setBackground(DesignManager.resolveBackground(OACMenuItem.class, jc.getBackground()));
+                jc.setForeground(DesignManager.resolveForeground(OACMenuItem.class, jc.getForeground()));
+            }
+        }
+    }
+
     @Override
     public Component add(Component comp) {
         this.initOther(comp);