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Thread: Simple but fustrating issue with swing

  1. #1
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    Unhappy Simple but fustrating issue with swing

    Im struggling to add a scrollable submenu in a pop up. I use a jPopupMenu to create the initial menu when you right click and then when you navigate to one of the options it displays a scrollpane with all my data in but when you move the mouse to the scrollpane it ditches the initial "invoking" pop up menu which inturn removes the scrollpane.

    Please help...

    import java.awt.*;  
    import java.awt.event.*;  
    import javax.swing.*;  
     
    public class ScollingSubMenu {
     
       private static javax.swing.JPopupMenu MainMenu;
       private static JPopupMenu AddButtonPopup;
     
        private static void AddButtonStateChanged(javax.swing.event.ChangeEvent evt) {
            javax.swing.JMenu temp = (javax.swing.JMenu)evt.getSource();
            if (temp.isSelected()) {
                if (!AddButtonPopup.isVisible()) {
                    Rectangle r = AddButtonPopup.getInvoker().getBounds();
                    Point p = new Point(r.x+r.width, r.y-3);
                    SwingUtilities.convertPointToScreen(p, AddButtonPopup.getInvoker().getParent());
                    AddButtonPopup.setLocation(p);
                    AddButtonPopup.setVisible(true);
                }
            }
            else {
                Rectangle r = AddButtonPopup.getBounds();
                r.x = AddButtonPopup.getLocationOnScreen().x - 5;
                r.y = AddButtonPopup.getLocationOnScreen().y - 5;
                r.height = r.height + 10;
                r.width = r.width + 10;
     
                Point mouse = MouseInfo.getPointerInfo().getLocation();
                boolean inside = r.contains(mouse);
     
                if (AddButtonPopup.isVisible()&& !inside) {
                    AddButtonPopup.setVisible(false);
                }
            }
        }
     
       private static javax.swing.JMenu TestMenu() {
            javax.swing.JMenu SizeMenu = new javax.swing.JMenu("Add Button");
            javax.swing.JMenuItem TempMenuItem;
     
            if (AddButtonPopup != null) {
                AddButtonPopup.setVisible(false);
            }
            AddButtonPopup = new JPopupMenu();
            AddButtonPopup.setInvoker(SizeMenu);        
            AddButtonPopup.setLayout(new BorderLayout());
            AddButtonPopup.setPopupSize(200, 300);
            javax.swing.JPanel panel = new javax.swing.JPanel(new GridLayout(0,1)); 
     
            SizeMenu.addChangeListener(new javax.swing.event.ChangeListener() {
                public void stateChanged(javax.swing.event.ChangeEvent evt) {
                    AddButtonStateChanged(evt);
                }
            });
     
            for (int i = 1; i < 60; i++) {
                TempMenuItem = new javax.swing.JMenuItem("Item" + String.valueOf(i));
                TempMenuItem.addActionListener(new ActionListener() { 
                public void actionPerformed(ActionEvent e)
                {
                    System.out.println("Got It!");
                }
            });
                panel.add(TempMenuItem);
            }
     
            javax.swing.JScrollPane scrollPane = new javax.swing.JScrollPane(panel);
            AddButtonPopup.add(scrollPane);
     
     
            return SizeMenu;
        }
     
        public static javax.swing.JPopupMenu CreateOptionsMenu() {
            MainMenu = new javax.swing.JPopupMenu();
            javax.swing.JMenuItem extraButton = new javax.swing.JMenuItem("Extra Button");
            MainMenu.add(TestMenu());
            MainMenu.add(extraButton);
     
            return MainMenu;
        }
     
        private static void jPanel1MouseReleased(java.awt.event.MouseEvent evt) {                                      
            if (evt.getButton()==3) {
                javax.swing.JPopupMenu aggregateMenu = CreateOptionsMenu();
                aggregateMenu.show(evt.getComponent(),evt.getX(),evt.getY());
            }
        }    
     
        public static void main(String[] args) {  
            JFrame f = new JFrame();  
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
            f.setLocation(200,200);
            f.setVisible(true);
            javax.swing.JPanel panel1 = new javax.swing.JPanel();
            panel1.setPreferredSize(new Dimension(100,100)); 
            panel1.setLocation(200,200); 
            panel1.setVisible(true); 
            panel1.addMouseListener(new java.awt.event.MouseAdapter() {
                public void mouseReleased(java.awt.event.MouseEvent evt) {
                    jPanel1MouseReleased(evt);
                }
            });
            f.add(panel1);
            f.pack();        
        }  
    }


  2. #2
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    Default Re: Simple but fustrating issue with swing

    I'm not sure I understand entirely what you are describing (pictures or something can be helpful when you are facing GUI related problems since it is hard to visually imagine someone else's GUI design with just the code), but if I think I understand you correct, could it be that Swing does not allow two light-weight popup components at the same time? (a simple example would be: imagine a JComboBox inside a JPopupMenu. If you open the JPopupMenu and attempt to then open the JComboBox in the menu, the menu will close)
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  3. #3
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    Default Re: Simple but fustrating issue with swing

    http://www.beatricehaines.com/screen.jpg

    Here is an image. The left popupmenu appears when you right click and then when you move the mouse over the add button the scrollpane appears in place but when you move the mouse over to the scroll pane the left menu vanishes and takes the right one with it (i guess its parent goes so it follows).

  4. #4
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    Default Re: Simple but fustrating issue with swing

    Yeah, I don't think Swing supports the behavior you want. Your JPanel (inside of the scroll panel) is a lightweight container, as is your popup menu. When you attempt to focus on your JPanel, it automatically closes the popup menu and, as you mentioned, when the popup menu goes, so does your JPanel. Have you considered simply making the Add Button item in your popup menu open a JWindow or JDialog which contains your list and scroll pane?
    NOTE TO NEW PEOPLE LOOKING FOR HELP ON FORUM:

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    1. Put your code in Java Tags. To do this, put [highlight=java] before your code and [/highlight] after your code.
    2. Give full details of errors and provide us with as much information about the situation as possible.
    3. Give us an example of what the output should look like when done correctly.

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