JPopupMenu positioning

  To: comp.lang.java.gui
JPopupMenu positioning

I have a button, which, when clicked, should show a popup menu alignd
with its lower right corner.

The issue is that the popup menu shows in a wrong place with the first
click on the button, and in the correct one on every subsequent click,
even when moving or resizing the window.

source to display the problem:
-snip-
public class NewJFrame extends javax.swing.JFrame {
    
    /** Creates new form NewJFrame */
    public NewJFrame() {
        initComponents();
    }
    
    private void initComponents() {

        jPopupMenu1 = new javax.swing.JPopupMenu();
        jMenuItem1 = new javax.swing.JMenuItem();
        jMenuItem2 = new javax.swing.JMenuItem();
        jButton1 = new javax.swing.JButton();

        jMenuItem1.setText("Item 1");
        jPopupMenu1.add(jMenuItem1);

        jMenuItem2.setText("Item 2");
        jPopupMenu1.add(jMenuItem2);
  
        setDefaultCloseOperation(javax.swing.WindowConstants
             .EXIT_ON_CLOSE);

        jButton1.setText("jButton1");
        jButton1.addActionListener(new
                java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent
                    evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new
                javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax
                .swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment
                .TRAILING, layout.createSequentialGroup()
                .addContainerGap(206, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addContainerGap())
        );
        layout.setVerticalGroup(
           
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jButton1)
                .addContainerGap(219, Short.MAX_VALUE))
        );

        pack();
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent
            evt) {
        // show the popupmenu
        jPopupMenu1.show(jButton1, jButton1.getWidth() -
                jPopupMenu1.getWidth(),
                jButton1.getHeight());
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }
    
    private javax.swing.JButton jButton1;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JMenuItem jMenuItem2;
    private javax.swing.JPopupMenu jPopupMenu1;
}
-snip-

Any way to make it behave the way I want to (show up in the correct
place on the first try)? I have tried

JFrame.invalidate()
JFrame.validate()
JFrame.pack()

JPopupMenu.invalidate()
JPopupMenu.validate()
JPopupMenu.pack()

I also tried to set the popup menus on screen location directly, but
never found out how to get the correct point. This might be a possible
solution, to call jPopupMenu1.setLocation().

Thanks again.
--
Sabine Dinis Blochberger

Op3racional
www.op3racional.eu

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