Membuat Popup (Context) Menu Di Pemrograman Java

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// Nama file : DemoPopupMenu.java
// Pemformatan teks menggunakan popup menu

// Mengimpor kelas
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

// Mendeklarasikan kelas
public class DemoPopupMenu extends JFrame {

   private JLabel label;
   private JPopupMenu popupMenu;
   private JRadioButtonMenuItem horAlign[], verAlign[], foreColor[], backColor[];
   private int horAlignValue[] = {SwingConstants.LEFT, SwingConstants.CENTER,
                                  SwingConstants.RIGHT};
   private int verAlignValue[] = {SwingConstants.TOP, SwingConstants.CENTER,
                                  SwingConstants.BOTTOM};
   private Color foreColorValue[] = {Color.BLACK, Color.BLUE, Color.RED};
   private Color backColorValue[] = {Color.YELLOW, Color.WHITE, Color.CYAN};
   private ButtonGroup groupHor, groupVer, groupFore, groupBack;

   // Konstruktor kelas
   public DemoPopupMenu() {
      label = new JLabel("Belajar Java", SwingConstants.CENTER);
      label.setForeground(Color.BLUE);
      label.setFont(new Font("Tahoma", Font.BOLD, 32));
      getContentPane().setBackground(Color.YELLOW);
      getContentPane().add(label, BorderLayout.CENTER);
      label.addMouseListener(
         new MouseAdapter() {
            public void mousePressed(MouseEvent me) {
               displayPopupMenu(me);
            }

            public void mouseReleased(MouseEvent me) {
               displayPopupMenu(me);
            }
         }
      );

      popupMenu = new JPopupMenu();
      RadioButtonHandler radioButtonHandler = new RadioButtonHandler();
      
      // Submenu dan item menu untuk penjajaran horisontal
      JMenu mnuHorAlign = new JMenu("Horizontal Alignment");
      mnuHorAlign.setMnemonic('H');
      popupMenu.add(mnuHorAlign);

      groupHor = new ButtonGroup();
      String horAlignName[] = {"Left", "Center", "Right"};
      horAlign = new JRadioButtonMenuItem[horAlignName.length];
      for (int x = 0; x < horAlign.length; x++) {
         horAlign[x] = new JRadioButtonMenuItem(horAlignName[x]);
         mnuHorAlign.add(horAlign[x]);
         groupHor.add(horAlign[x]);
         horAlign[x].addActionListener(radioButtonHandler);
      }

      horAlign[1].setSelected(true);

      // Submenu dan item menu untuk penjajaran vertikal
      JMenu mnuVerAlign = new JMenu("Vertical Alignment");
      mnuVerAlign.setMnemonic('V');
      popupMenu.add(mnuVerAlign);

      groupVer = new ButtonGroup();
      String verAlignName[] = {"Top", "Center", "Bottom"};
      verAlign = new JRadioButtonMenuItem[verAlignName.length];
      for (int x = 0; x < verAlign.length; x++) {
         verAlign[x] = new JRadioButtonMenuItem(verAlignName[x]);
         mnuVerAlign.add(verAlign[x]);
         groupVer.add(verAlign[x]);
         verAlign[x].addActionListener(radioButtonHandler);
      }

      verAlign[1].setSelected(true);
      popupMenu.addSeparator();

      //submenu dan item menu untuk foreground color
      JMenu mnuForeColor = new JMenu("Foreground color");
      mnuForeColor.setMnemonic('o');
      popupMenu.add(mnuForeColor);

      groupFore = new ButtonGroup();
      String foreColorName[] = {"Black", "Blue", "Red"};
      foreColor = new JRadioButtonMenuItem[foreColorName.length];
      for (int x = 0; x < foreColor.length; x++) {
         foreColor[x] = new JRadioButtonMenuItem(foreColorName[x]);
         mnuForeColor.add(foreColor[x]);
         groupFore.add(foreColor[x]);
         foreColor[x].addActionListener(radioButtonHandler);
      }

      foreColor[1].setSelected(true);

      //submenu dan item menu untuk background color
      JMenu mnuBackColor = new JMenu("Background color");
      mnuBackColor.setMnemonic('a');
      popupMenu.add(mnuBackColor);

      groupBack = new ButtonGroup();
      String backColorName[] = {"Yellow", "White", "Cyan"};
      backColor = new JRadioButtonMenuItem[backColorName.length];
      for (int x = 0; x < backColor.length; x++) {
         backColor[x] = new JRadioButtonMenuItem(backColorName[x]);
         mnuBackColor.add(backColor[x]);
         groupBack.add(backColor[x]);
         backColor[x].addActionListener(radioButtonHandler);
      }

      backColor[0].setSelected(true);
      popupMenu.addSeparator();

      
      // Item menu Exit
      JMenuItem mnuExit = new JMenuItem("Exit");
      mnuExit.setMnemonic('E');
      popupMenu.add(mnuExit);
      mnuExit.addActionListener(
         new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
               System.exit(0);
            }
         }
      );
   }

   // Metoda displayPopupMenu
   private void displayPopupMenu(MouseEvent me) {
      if (me.isPopupTrigger())
         popupMenu.show(me.getComponent(), me.getX(), me.getY());
   }

   // Inner class
   class RadioButtonHandler implements ActionListener {
      
      public void actionPerformed(ActionEvent ae) {
      
         for (int y = 0; y < horAlign.length; y++) {
            if (horAlign[y].isSelected()) {
               label.setHorizontalAlignment(horAlignValue[y]);
               break;
            }
         }

         for (int y = 0; y < verAlign.length; y++) {
            if (verAlign[y].isSelected()) {
               label.setVerticalAlignment(verAlignValue[y]);
               break;
            }
         }

         for (int y = 0; y < foreColor.length; y++) {
            if (foreColor[y].isSelected()) {
               label.setForeground(foreColorValue[y]);
               break;
            }
         }

         for (int y = 0; y < backColor.length; y++) {
            if (backColor[y].isSelected()) {
               getContentPane().setBackground(backColorValue[y]);
               break;
            }
         }
         
         repaint();
      }
   }

   // Metoda main
   public static void main(String[] args) {
      DemoPopupMenu frame = new DemoPopupMenu();
      frame.setTitle("Kelas DemoPopupMenu");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(360, 195);
      frame.setVisible(true);
   }
}