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src/Common/Visual/Menus/StyledPopupMenu.java

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+package Common.Visual.Menus;
+import Common.Visual.CommonUI;
+import Common.Visual.Themes.ThemeElement;
+
+import javax.swing.*;
+import javax.swing.event.PopupMenuEvent;
+import javax.swing.event.PopupMenuListener;
+public class StyledPopupMenu extends JPopupMenu implements ThemeElement {
+    public StyledPopupMenu() {
+        addPopupMenuListener(new PopupMenuListener() {
+            @Override
+            public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
+                CheckElementsVisibility();
+            }
+            @Override
+            public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
+            }
+            @Override
+            public void popupMenuCanceled(PopupMenuEvent e) {
+            }
+        });
+    }
+    private void refreshTheme_r(MenuElement element) {
+        element.getComponent().setBackground(CommonUI.getTheme().background);
+        element.getComponent().setForeground(CommonUI.getTheme().foreground);
+        for (MenuElement se : element.getSubElements())
+            refreshTheme_r(se);
+    }
+    @Override
+    public void applyTheme() {
+        setBackground(CommonUI.getTheme().background);
+        setForeground(CommonUI.getTheme().foreground);
+        refreshTheme_r(this);
+    }
+    public void CheckElementsVisibility() {
+        applyTheme();
+    }
+}