MouseListener in two JPanels

Hi,
I use a object GoupingPane extends JPanel.
On this JPanel I add 400 smaller JPanels, like a grid, using FlowLayout. So the groupingPanel is totaly covered.
The GroupingPanel and the 400 small JPanels have their own MouseListeners.
The GroupingPanel also got a MouseMotionListener.
But only the MouseListener of a small JPanel react, and different MouseEvents are defined....
please help

Here u have two layers.... the bottom is the groupingPanel and the top layer is formed by all the small panels. So when u click on this the mouseevent for the small panels is fired that being the top layer.
This is just like having a button on the panel... when you click the button the event for that button is only fired.
Hope i am clear.

Similar Messages

Overlapping two JPanels on a JLayeredPane

I am having some problems overlapping two JPanels on a JLayeredPane for some reason only one of them shows when I compile the program! Any help would be greatly appreciated
The code is the following:
import java.lang.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class SpaceBall
//To do the background just draw a JPanel inside another //JPanel just set the opacity of the outside one
//to false and let
//it hold all the components of the game
public static void main(String[] args)
//declaring the buttons
JButton test=new JButton("test");
JButton test1=new JButton("test1");
JButton test2=new JButton("test2");
//declaring and setting the properties of the frame
JFrame SpaceBall= new JFrame("Space Ball");
SpaceBall.setSize(700,650);
//declaring the Panels
JLayeredPane bgPanel= new JLayeredPane();
JPanel fgPanel= new JPanel();
JPanel topPanel= new JPanel();
JPanel sidePanel= new JPanel();
JPanel lowPanel= new JPanel();
JPanel masterPanel= new JPanel();
//adding the buttons to the corresponding panels
fgPanel.add(test1);
sidePanel.add(test2);
topPanel.add(test);
ImageIcon background= new ImageIcon("images/background.jpg");
JLabel backlabel = new JLabel(background);
backlabel.setBounds(0,0,background.getIconWidth(),background.getIconHeight());
backlabel.add(test1);
bgPanel.add(backlabel, new Integer(0));
fgPanel.setOpaque(false);
bgPanel.add(fgPanel, new Integer(100));
bgPanel.moveToFront(fgPanel);
//adding bgPanel and sidePanel to lowPanel
lowPanel.setLayout(new GridLayout(1,2));
lowPanel.add(bgPanel);
lowPanel.add(sidePanel);
//adding the Panels to the masterPanel
masterPanel.setLayout(new GridLayout(2,1));
masterPanel.add(topPanel);
masterPanel.add(lowPanel);
//getting the container of SpaceBall and adding the Panels to it
Container cp=SpaceBall.getContentPane();
cp.add(masterPanel);
//displaying everything
SpaceBall.show();
WindowListener ClosingTheWindow=new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
SpaceBall.addWindowListener(ClosingTheWindow);

Take a look at the section from the Swing tutorial titled "How to Use Layered Panes". It has a sample program:
http://java.sun.com/docs/books/tutorial/uiswing/components/layeredpane.html

Setting Up a GUI - FlowLayout - Using Two JPanels

Hello:
I am getting confused with setting up a GUI with two JPanels one that would be on top and the other middlePanel having a FlowLayout.
I set up two JPanels but obviously have something wrong because my northPanel has "disappeared" when I added a middlePanel. My componets are all over the place and again my northPanel is no longer showing.
Idea of what I'm doing.
1) Enter total number of diners
2)Confirm that diners # is correct.
3)Enter name of Diner
4)Take order - Entree (Pull-Down)
5)Two sides (CheckBox)
6)Display Completed Order of diners.
P.S. I hope my question is not too stupid I am new and has justed started Java Programming. I have tried to look through the Documentation but am getting confused with GUI relating to FlowLayout, GridLayout. etc. I'm just not sure which one I should use to set up my GUI in an organized manner. Am I on the right track or is my code completely screwed. Thanks.
** My Code **
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Menu extends JFrame {
private JTextField partyNumField, dinerName;
private JComboBox orderComboBox;
private int partyNum;
private JButton getParty, continueOrder;
private JLabel party, companyLogo, dinerLabel, entreeOrder;
private String dinnerEntree[] = {"Filet Mignon", "Chicken Cheese Steak", "Tacos", "Ribs"};
private JCheckBox mashed, cole, baked, french;
public Menu() {
super("O'Brien Caterer - Where we make good Eats!");
Container container = getContentPane();
JPanel northPanel = new JPanel();
northPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 80, 5));
companyLogo = new JLabel("Welcome to O'Brien's Caterer's");
northPanel.add(companyLogo);
party = new JLabel("Enter the Total Number in Party Please");
partyNumField = new JTextField(5);
northPanel.add(party);
northPanel.add(partyNumField);
getParty = new JButton("GO - Continue with Order");
getParty.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent actionEvent)
partyNum = Integer.parseInt(partyNumField.getText());
String ans=JOptionPane.showInputDialog(null, "Total Number is party is: "
+ partyNum + " is this correct?\n\n" + "Enter 1 to continue\n"
+ "Enter 2 to cancel\n");
if (ans.equals("1")) {
System.out.println(ans+"=continue"); // handle continue
} else { // assume to be 2 for cancel
System.out.println(ans+"=cancel"); // handle cancel
); // end Listener
northPanel.add(getParty);
JPanel middlePanel = new JPanel();
middlePanel.setLayout(new FlowLayout(FlowLayout.CENTER));
dinerLabel = new JLabel("Please enter Diner's name");
dinerName = new JTextField(30);
continueOrder = new JButton("continue");
middlePanel.add(dinerLabel);
middlePanel.add(continueOrder);
middlePanel.add(dinerName);
entreeOrder = new JLabel("Please choose an entree");
orderComboBox = new JComboBox(dinnerEntree);
orderComboBox.setMaximumRowCount(4);
//orderComboBox.addItemListener(
// new ItemListener(){
// public void itemsStateChanged(ItemEvent event)
// if (event.getStateChange() == ItemEvent.SELECTED)
// add entree order to Person
// continue ** enable the two sides order
mashed = new JCheckBox("Mashed Potatoes");
middlePanel.add(mashed);
cole = new JCheckBox("Cole Slaw");
middlePanel.add(cole);
baked = new JCheckBox("Baked Beans");
middlePanel.add(baked);
french = new JCheckBox("FrenchFries");
middlePanel.add(french);
// CheckBoxHandler handler = new CheckBoxHandler();
// mashed.addItemListener(handler);
// cole.addItemListener(handler);
// baked.addItemListener(handler);
// french.addItemListener(handler);
middlePanel.add(entreeOrder);
middlePanel.add(orderComboBox);
container.add(northPanel);
container.add(middlePanel);
middlePanel.setEnabled(true);
setSize(500, 500);
show();
// private class to handle event of choosing Check BOx Item
// private class CheckBoxHandler implements ItemListener{
// private int count = 0;
// public void itemStateChanged(ItemEvent event){
// if (event.getsource() == mashed)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
// add mashed choice to person's order
// if (event.getsource() == cole)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add cole slaw to person's order
// if (event.getsource() == baked)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add baked beans to person's order
// if (event.getsource() == french)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add french to person's order
public static void main(String args[])
Menu application = new Menu();
application.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent windowEvent)
System.exit(0);
}

This looks better, i myself don't like the flow layout
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Menu1 extends JFrame
     private JTextField partyNumField, dinerName;
     private JComboBox orderComboBox;
     private int partyNum;
     private JButton getParty, continueOrder;
     private JLabel party, companyLogo, dinerLabel, entreeOrder;
     private String dinnerEntree[] = {"Filet Mignon", "Chicken Cheese Steak", "Tacos", "Ribs"};
     private JCheckBox mashed, cole, baked, french;
public Menu1()
     super("O'Brien Caterer - Where we make good Eats!");
     addWindowListener(new WindowAdapter()
         public void windowClosing(WindowEvent ev)
               dispose();
               System.exit(0);
     Container container = getContentPane();
     JPanel northPanel = new JPanel();
     northPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 120,15));
     companyLogo   = new JLabel("Welcome to O'Brien's Caterer's");
     northPanel.add(companyLogo);
     party         = new JLabel("Enter the Total Number in Party Please");
     partyNumField = new JTextField(5);
     northPanel.add(party);
     northPanel.add(partyNumField);
     getParty    = new JButton("GO - Continue with Order");
     northPanel.add(getParty);
     northPanel.setPreferredSize(new Dimension(700,150));
     getParty.addActionListener(new ActionListener()
          public void actionPerformed(ActionEvent actionEvent)
               partyNum = Integer.parseInt(partyNumField.getText());
               String ans=JOptionPane.showInputDialog(null, "Total Number is party is: "
               + partyNum + " is this correct?\n\n" + "Enter 1 to continue\n"
               + "Enter 2 to cancel\n");
               if (ans.equals("1"))
                    System.out.println(ans+"=continue"); // handle continue
               else { // assume to be 2 for cancel
               System.out.println(ans+"=cancel"); // handle cancel
     }}); // end Listener
     JPanel middlePanel = new JPanel();
     middlePanel.setLayout(new FlowLayout(FlowLayout.CENTER));
     dinerLabel         = new JLabel("Please enter Diner's name");
     dinerName          = new JTextField(30);
     continueOrder      = new JButton("continue");
     middlePanel.add(dinerLabel);
     middlePanel.add(dinerName);
     middlePanel.add(continueOrder);
     entreeOrder   = new JLabel("Please choose an entree");
     orderComboBox = new JComboBox(dinnerEntree);
     orderComboBox.setMaximumRowCount(4);
//orderComboBox.addItemListener(
// new ItemListener(){
// public void itemsStateChanged(ItemEvent event)
// if (event.getStateChange() == ItemEvent.SELECTED)
// add entree order to Person
// continue ** enable the two sides order
     mashed = new JCheckBox("Mashed Potatoes");
     middlePanel.add(mashed);
     cole   = new JCheckBox("Cole Slaw");
     middlePanel.add(cole);
     baked = new JCheckBox("Baked Beans");
     middlePanel.add(baked);
     french = new JCheckBox("FrenchFries");
     middlePanel.add(french);
// CheckBoxHandler handler = new CheckBoxHandler();
// mashed.addItemListener(handler);
// cole.addItemListener(handler);
// baked.addItemListener(handler);
// french.addItemListener(handler);
     middlePanel.add(entreeOrder);
     middlePanel.add(orderComboBox);
//container.add(northPanel);
//container.add(middlePanel);
     container.add(northPanel, java.awt.BorderLayout.NORTH);
     container.add(middlePanel, java.awt.BorderLayout.CENTER);
     middlePanel.setEnabled(true);
     setSize(600, 500);
     show();
// private class to handle event of choosing Check BOx Item
// private class CheckBoxHandler implements ItemListener{
// private int count = 0;
// public void itemStateChanged(ItemEvent event){
// if (event.getsource() == mashed)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
// add mashed choice to person's order
// if (event.getsource() == cole)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add cole slaw to person's order
// if (event.getsource() == baked)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add baked beans to person's order
// if (event.getsource() == french)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add french to person's order
public static void main(String args[])
     new Menu1();
no edit
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Menu1 extends JFrame
     private JTextField partyNumField, dinerName;
     private JComboBox orderComboBox;
     private int partyNum;
     private JButton getParty, continueOrder;
     private JLabel party, companyLogo, dinerLabel, entreeOrder;
     private String dinnerEntree[] = {"Filet Mignon", "Chicken Cheese Steak", "Tacos", "Ribs"};
     private JCheckBox mashed, cole, baked, french;
public Menu1()
     super("O'Brien Caterer - Where we make good Eats!");
     addWindowListener(new WindowAdapter()
     public void windowClosing(WindowEvent ev)
               dispose();
               System.exit(0);
     Container container = getContentPane();
     JPanel northPanel = new JPanel();
     northPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 120,15));
     companyLogo = new JLabel("Welcome to O'Brien's Caterer's");
     northPanel.add(companyLogo);
     party = new JLabel("Enter the Total Number in Party Please");
     partyNumField = new JTextField(5);
     northPanel.add(party);
     northPanel.add(partyNumField);
     getParty = new JButton("GO - Continue with Order");
     northPanel.add(getParty);
     northPanel.setPreferredSize(new Dimension(700,150));
     getParty.addActionListener(new ActionListener()
          public void actionPerformed(ActionEvent actionEvent)
               partyNum = Integer.parseInt(partyNumField.getText());
               String ans=JOptionPane.showInputDialog(null, "Total Number is party is: "
               + partyNum + " is this correct?\n\n" + "Enter 1 to continue\n"
               + "Enter 2 to cancel\n");
               if (ans.equals("1"))
                    System.out.println(ans+"=continue"); // handle continue
               else { // assume to be 2 for cancel
               System.out.println(ans+"=cancel"); // handle cancel
     }}); // end Listener
     JPanel middlePanel = new JPanel();
     middlePanel.setLayout(new FlowLayout(FlowLayout.CENTER));
     dinerLabel = new JLabel("Please enter Diner's name");
     dinerName = new JTextField(30);
     continueOrder = new JButton("continue");
     middlePanel.add(dinerLabel);
     middlePanel.add(dinerName);
     middlePanel.add(continueOrder);
     entreeOrder = new JLabel("Please choose an entree");
     orderComboBox = new JComboBox(dinnerEntree);
     orderComboBox.setMaximumRowCount(4);
//orderComboBox.addItemListener(
// new ItemListener(){
// public void itemsStateChanged(ItemEvent event)
// if (event.getStateChange() == ItemEvent.SELECTED)
// add entree order to Person
// continue ** enable the two sides order
     mashed = new JCheckBox("Mashed Potatoes");
     middlePanel.add(mashed);
     cole = new JCheckBox("Cole Slaw");
     middlePanel.add(cole);
     baked = new JCheckBox("Baked Beans");
     middlePanel.add(baked);
     french = new JCheckBox("FrenchFries");
     middlePanel.add(french);
// CheckBoxHandler handler = new CheckBoxHandler();
// mashed.addItemListener(handler);
// cole.addItemListener(handler);
// baked.addItemListener(handler);
// french.addItemListener(handler);
     middlePanel.add(entreeOrder);
     middlePanel.add(orderComboBox);
//container.add(northPanel);
//container.add(middlePanel);
     container.add(northPanel, java.awt.BorderLayout.NORTH);
     container.add(middlePanel, java.awt.BorderLayout.CENTER);
     middlePanel.setEnabled(true);
     setSize(600, 500);
     show();
// private class to handle event of choosing Check BOx Item
// private class CheckBoxHandler implements ItemListener{
// private int count = 0;
// public void itemStateChanged(ItemEvent event){
// if (event.getsource() == mashed)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
// add mashed choice to person's order
// if (event.getsource() == cole)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add cole slaw to person's order
// if (event.getsource() == baked)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add baked beans to person's order
// if (event.getsource() == french)
// if (event.getStateChange() == ItemEvent.SELECTED)
// count++;
//add french to person's order
public static void main(String args[])
     new Menu1();
}

Two jpanels, after disableing button s-times it appears on the top jpanel

I create two JPanels. The first JPanel contains JButton, the second JPanl contains overrided paintComponent - it's a simple background.
Firstly I add 1st jpanel to jframe, then I add the second jpanel with a background image. Then I disable a button and sometime this button appears on top of the second jpanel.
Resources:
background.png - 1280x1024x24
b_h & b_n .png - 122x120x24
I think that when I make a thread where then I will disable a button, it will appear on top of the second jpanel.
package swing.test.bug;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.swing.JFrame;
public class MainFrame extends JFrame
public static int SCREEN_WIDTH = 1280;
public static int SCREEN_HEIGHT = 1024;
ScreenWithButton jp1;
ScreenWithImage jp2;
public static void main(String[] args) throws IOException
    MainFrame terminal = new MainFrame();
public MainFrame()
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setUndecorated(true);
    setResizable(false);
    setBounds(0, 0, 1280, 1024);
    getContentPane().setLayout(null);
    (jp2 = new ScreenWithImage()).setBounds(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
    getContentPane().add(jp2);
    (jp1 = new ScreenWithButton()).setBounds(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
    getContentPane().add(jp1);
    jp1.setVisible(true);
    jp2.setVisible(true);
    setVisible(true);
    jp1.info.setEnabled(false);
public static final BufferedImage getBufferedImage(String url)
    try
        BufferedImage image = javax.imageio.ImageIO.read(new File("c:\\" + url));
        return image;
    catch (Exception ex)
        ex.printStackTrace();
        return null;
package swing.test.bug;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JPanel;
public class ScreenWithButton extends JPanel
JButton info;
public ScreenWithButton()
    setOpaque(false);
    setLayout(null);
    info = new JButton("", new ImageIcon(MainFrame.getBufferedImage("/com/b_n.png")));
    info.setPressedIcon(new ImageIcon(MainFrame.getBufferedImage("/com/b_h.png")));
    info.setDisabledIcon(new ImageIcon(MainFrame.getBufferedImage("/com/b_h.png")));
    info.setContentAreaFilled(true);
    info.setBorderPainted(false);
    info.setFocusPainted(false);
    info.setBounds(1000, 82, 122, 120);
    info.setFocusable(false);
    info.setRolloverEnabled(false);
    add(info);
package swing.test.bug;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import javax.swing.JComponent;
import javax.swing.JPanel;
public class ScreenWithImage extends JPanel
public ScreenWithImage()
    setOpaque(false);
    setLayout(null);
    ImagePanel p = new ImagePanel();
    p.setImage((BufferedImage) MainFrame.getBufferedImage("/com/background.png"));
    p.setBounds(0, 0, MainFrame.SCREEN_WIDTH, MainFrame.SCREEN_HEIGHT);
    p.setPreferredSize(new Dimension(MainFrame.SCREEN_WIDTH, MainFrame.SCREEN_HEIGHT));
    add(p);
public class ImagePanel extends JComponent
    private BufferedImage image;
    public void paintComponent(Graphics g)
        if(image != null)
            g.drawImage(image,0,0,null);
    public void setImage(BufferedImage value)
        image = value;
}

Hi Alcrouchy,
I apologize, I'm a bit unclear on exactly what you are describing. If the screen appears to be sliding downward (leaving a blank portion at the top), you may be seeing the Reachability feature of iOS 8 on the iPhone 6/6 Plus. It is intended to make it easier to reach elements towards the top of the screen on the larger iPhones, and is activated by a double tap (not press) on the Home button. There is a bit more about it on this Design page about the iPhone 6:
Apple - iPhone 6 - Design
Regards,
- Brenden

Two JPanels inside another panel should be equal in width

Hi everybody,
I have two JPanels which both have a titledborder. I want them to have the same with, but I can not get it done. You can see how it looks here: http://jborsje.nl/jpanels.png. As you can see the JPanels are not equal in width. Here is the code I used (please note that p_hopsControl = true).
     * Initialize the sidebar of the graph panel.
     * @param p_hopsControl Indicates whether or not a widget for controlling the
     * hops in the graph should be added to the panel.
    private JPanel getSideBar(boolean p_hopsControl)
        // Create the panel.
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.anchor = GridBagConstraints.FIRST_LINE_START;
        // Add the label and the spinner to the panel.
        constraints.gridx = 0;
        if (!p_hopsControl) constraints.weighty = 1;
        constraints.gridy = 0;
        panel.add(getLegend(), constraints);
        if (p_hopsControl)
            constraints.gridy = 1;
            constraints.weighty = 1;
            constraints.weightx = 1;
            panel.add(getHopsWidgets(), constraints);
        // Set the background of the panel.
        panel.setBackground(m_display.getBackground());
        return panel;
    private JEditorPane getLegend()
        String content = "<html><body>" +
                "<table>" +
                "<tr><td bgcolor=\"" + Integer.toHexString(Constants.NODE_COLOR_CLASS & 0x00ffffff) + "\" width=\"20px\"></td><td>OWL class</td></tr>" +
                "<tr><td bgcolor=\"" + Integer.toHexString(Constants.NODE_COLOR_INDIVIDUAL & 0x00ffffff) + "\"></td><td>OWL individual</td></tr>" +
                "<tr><td bgcolor=\"" + Integer.toHexString(Constants.NODE_COLOR_SELECTED & 0x00ffffff) + "\"></td><td>Node selected</td></tr>" +
                "<tr><td bgcolor=\"" + Integer.toHexString(Constants.NODE_COLOR_HIGHLIGHTED & 0x00ffffff) + "\"></td><td>Node highlighted</td></tr>" +
                "<tr><td bgcolor=\"" + Integer.toHexString(Constants.NODE_COLOR_SEARCH & 0x00ffffff) + "\"></td><td>Node in search result set</td></tr>" +
                "<tr><td bgcolor=\"" + Integer.toHexString(Constants.NODE_DEFAULT_COLOR & 0x00ffffff) + "\"></td><td>Node in search result set</td></tr>" +
                "</body></html>";
        JEditorPane legend = new JEditorPane("text/html", content);
        legend.setEditable(false);
        legend.setBorder(new TitledBorder("Legend"));
        JPanel panel = new JPanel();
        panel.setBorder(new TitledBorder("Legend"));
        panel.add(legend);
        return legend;
     * Create a panel containing a JSpinner which can be used to set the number
     * of hops, used in the graph distance filter.
     * @return A JPanel containing the hops widgets.
    private JPanel getHopsWidgets()
        // Get the GraphDistanceFilter.
        GraphDistanceFilter filter = m_display.getDistanceFilter();
        // Create the panel.
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.anchor = GridBagConstraints.FIRST_LINE_START;
        // Create the label.
        JLabel label = new JLabel("Number of hops: ");
        // Create the spinner and its model.
        SpinnerNumberModel model = new SpinnerNumberModel(filter.getDistance(), 0, null, 1);
        m_spinner = new JSpinner();
        m_spinner.addChangeListener(this);
        m_spinner.setModel(model);
        // Add the label and the spinner to the panel.
        constraints.gridx = 0;
        constraints.gridy = 0;
        panel.add(label, constraints);
        constraints.gridx = 1;
        constraints.weighty = 1;
        panel.add(m_spinner, constraints);
        // Set the background of the panel.
        panel.setBackground(m_display.getBackground());
        // Add a titled border to the panel.
        panel.setBorder(new TitledBorder("Hops control"));
        return panel;
    }Does anybody know how this can be done?

Thanks, that solved my issue for the width part. Now the content of the "hops control" panel is centered, althoug I explicitely said "constraints.anchor = GridBagConstraints.FIRST_LINE_START;".
The update image can still be found here: http://www.jborsje.nl/jpanels.png.

Help Please, Problem in displaying same JTables on two JPanels

Problem in displaying same JTables on two JPanels. In an application, I have a dynamic display of JTables on one JPanel. After a print preview button action, I have to bring same JTables on another JPanels, while taking this the previous JPanels content(JTables) become invisible? Why this happened? may be single component. Is the Cloning process nedded?

Hi,
you can add a component to one container only. If you try to add it to a second container, it will be removed from the first.
You could try holding one member of the TableModel and set that one to both tables.
Greets,
Christian

One JPanel is missing after adding two JPanels to a JFrame

I have two classes, ScoreTableView and CardView, which both extends the JPanel class. ScoreTableView is used to show one table only, and CardView is to show a set of cards for a memory game. My objective is to separate the development of the panels, so that it will easier to modify either of them later. I add instances of these two class to the contentPane of my top level JFrame object. However, I can only see the ScoreTableView(which is supposed to show me a table only) on the top part of the frame, and the CardView panel never show up.
ScoreTableView.java
public ScoreTableView(int numberOfPlayer){
//      Create a model of the data.
        scoreTable = new JTable();//this scoreTable is a JTable object
        scoreTable.setModel(scoreTableData); //scoreTableData is my data
        JScrollPane jsp = new JScrollPane(scoreTable);
        p = this;
        p.setLayout(new BorderLayout());
        p.add(jsp, BorderLayout.CENTER);
    }CardView.java
public CardView(int w, int h){
        cardWidth = w;
        cardHeight = h;
        JPanel cardPanel = new JPanel();
        cardPanel.setLayout(new GridLayout(cardWidth,cardHeight));
        CardImageButton[][] cardsButtons = new CardImageButton[cardWidth][cardHeight];
      // ... more other none GUI coiding
         }Here's what I have in my main
        Container contentPane = jf.getContentPane();//jf is the JFrame object
        contentPane.setLayout(new BorderLayout());
//      create the score panel
        ScoreTableView scoreTableView = new ScoreTableView(4);
      contentPane.add( scoreTableView, BorderLayout.NORTH);
        //create the cards panel
        CardView cardPanel = new CardView(4,4);
        contentPane.add(cardPanel, BorderLayout.CENTER);
        jf.pack();
        jf.setVisible(true);

Sorry, but I copied the wrong files. Now both panels can show up, but the score table is on the NORTH, and the card panel is on the SOUTH(although I set it to CENTER and wish it can occupy the rest of the window), but the center part of the window has nothing. How can I get rid of the white space, so that the score panel can can 30% of the top part of the window(even after resize), and the card panel can occupy the remaining 70%? I can't attach pictures here, otherwise I can upload some screenshot to show you what's the problem I have. Thank you in advance.
This is my CardView class, I didnt' copy all of them upstair.
public class CardView extends JPanel{
    private int cardWidth;
    private int cardHeight;
    private CardModel cm;
    private JPanel cardPanel;
    public CardView(int w, int h){
        cardWidth = w;
        cardHeight = h;
        cardPanel = this;
        cardPanel.setLayout(new GridLayout(cardWidth,cardHeight));
        CardImageButton[][] cardsButtons = new CardImageButton[cardWidth][cardHeight];
        int[][] list = init(cardWidth, cardHeight);
        cm = new CardModel(list);
        int count = 0;
        for(int i=0;i<cardWidth;i++){
            for(int j=0;j<cardWidth;j++){
                cardsButtons[i][j] = new CardImageButton("Press me"+count, cm, i, j, 0);
                cardPanel.add(cardsButtons[i][j]);
                count++;
public int[][] init(int n, int m){
        int[][] list = {
                {1, 2, 1, 1},
                {2, 1, 2 , 2},
                {1, 2, 1, 1},
                {2, 1, 2 , 2} };
        return list;
    }This is from my main.
       //setup the content panel
        Container contentPane = jf.getContentPane();
        contentPane.setLayout(new BorderLayout());
//      create the score panel
        ScoreTableView scoreTableView = new ScoreTableView(4);
      contentPane.add( scoreTableView, BorderLayout.NORTH);
        //create the cards panel
        CardView cardPanel = new CardView(4,4);
        contentPane.add(cardPanel, BorderLayout.CENTER);
        jf.pack();
        jf.setVisible(true);   ScoreTableView.java
public ScoreTableView(int numberOfPlayer){
//      Create a model of the data.
scoreTable = new JTable();//this scoreTable is a JTable object
scoreTable.setModel(scoreTableData); //scoreTableData is my data
JScrollPane jsp = new JScrollPane(scoreTable);
p = this;
p.setLayout(new BorderLayout());
p.add(jsp, BorderLayout.CENTER);
}

[GUI programming] How do two JPanels interact?

Hi, all
I've been looking if there is a standard/mostly-used way implementing GUI applications. e.g.,
under a JFrame, there are 2 MyPanel exntending JPanel, one placed on the leftside, the other on the rightside. they both have got a bunch of JButtons, JLabels, JList, etc. this is the view.
but for the control part, here comes the question: I'd would like PanelA to change background color if a Button on PanelB is pressed. where should I place this part of code that controls what happen. I've considered some possibilites, but not sure which one is the best.
1. implement it in main() like: if PanelA.Button.isPressed(), then PanelB.setBackground(Green)
pros: centrailized control
cons: could lead to long & messy code if there are many Panels needed to control
2. PanelA as Observer, PanelB Observable
pros: doable
cons: not very convenient
3. PanelA & PanelB both singleton, so they can reference to each other directly
pros: easy implementing
cons: less flexibility
if none of them is the way you do, how do you do it then?
any help will be appreciated.
thanks.

You missed the obvious one, just let the controlling panel have a reference to the color panel. In your frame:
ColoredPanel coloredPanel = new ColoredPanel();
ControlPanel control = new ControlPanel(coloredPanel);
// add to conten pane, etcThough ultimately your option two is the best one.

How to drag and drop an Image between two JPanels inside a Split Pane

I'm tring to do that, and my actual problem is as follows:
I drag the Image from the bottomPanel but I can't drop it in the topPanel, I'm using this classes:
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import java.awt.image.*;
public class MoveableComponentsContainer extends JSplitPane {
     public DragSource dragSource;
     public DropTarget dropTarget;
public JPanel topPanel = new JPanel();
public JPanel bottomPanel = new JPanel();
     public int ancho;
public int alto;
public MoveableLabel lab1,lab2,lab3,lab4;
public Icon ico1, ico2,ico3,ico4;
private static BufferedImage buffImage = null; //buff image
     private static Point cursorPoint = new Point();
public int getMaximumDividerLocation() {
return ( ( int ) ( alto * .85 ) );
public int getMinimumDividerLocation() {
return( ( int ) ( alto * .85 ) );
     public MoveableComponentsContainer(int Weight, int Height ) {
alto = Height;
ancho = Weight;
setOrientation( VERTICAL_SPLIT);
setDividerSize(2);
getMaximumDividerLocation();
getMinimumDividerLocation();
setPreferredSize(new Dimension( (int) ( Weight * .99 ), (int) ( Height * .94 ) ) );
setDividerLocation( getMaximumDividerLocation() );
System.out.println( " getDividerLocation() = " + getDividerLocation() );
topPanel.setName("topPanel");
bottomPanel.setName("bottomPanel");
bottomPanel.setPreferredSize( new Dimension( (int) ( Weight * .99 ), (int) ( ( Height * .94 ) * .15 ) ) );
bottomPanel.setMaximumSize( new Dimension( (int) ( Weight * .99 ), (int) ( ( Height * .94 ) * .15 ) ) );
bottomPanel.setMinimumSize( new Dimension( (int) ( Weight * .99 ), (int) ( ( Height * .94 ) * .15 ) ) );
topPanel. setPreferredSize( new Dimension( (int) ( Weight * .99 ), (int) ( ( Height * .94 ) * .85 ) ) );
topPanel. setMaximumSize( new Dimension( (int) ( Weight * .99 ), (int) ( ( Height * .94 ) * .85 ) ) );
topPanel. setMinimumSize( new Dimension( (int) ( Weight * .99 ), (int) ( ( Height * .94 ) * .85 ) ) );
bottomPanel.setEnabled(true);
bottomPanel.setVisible(true);
bottomPanel.setBackground( new Color( 57,76,123 ) );
topPanel. setEnabled(true);
topPanel. setVisible(true);
topPanel. setBackground( new Color( 57,76,123 ) );
setBottomComponent( bottomPanel );
setTopComponent( topPanel );
setOneTouchExpandable( false );
bottomPanel.setBorder(BorderFactory.createTitledBorder("Drag and Drop Test"));
          setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED, Color.white, Color.gray));
bottomPanel.setLayout( new FlowLayout() );
topPanel.setLayout(new FlowLayout());
          addMoveableComponents();
     private void addMoveableComponents() {
ico1 = new ImageIcon( "/usr/local/installers/java/lll/DnD/switchm.gif");
lab1 = new MoveableLabel("Centrales", ico1, topPanel );
lab1.setName("labelOne");
bottomPanel.add( lab1 );
          lab2 = new MoveableLabel("Destinos", ico1, topPanel);
lab2.setName("labelTwo");
          bottomPanel.add( lab2 );
          lab3 = new MoveableLabel("Registros", ico1, topPanel );
lab3.setName("labelThree");
          bottomPanel.add( lab3 );
          lab4 = new MoveableLabel("Parametros", ico1, topPanel);
lab4.setName("labelFour");
          bottomPanel.add( lab4 );
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
public class MoveableLabel extends JLabel implements Transferable {
final static int FILE = 0;
final static int STRING = 1;
final static int IMAGE = 2;
DataFlavor flavors[] = { DataFlavor.javaFileListFlavor,
DataFlavor.stringFlavor,
DataFlavor.imageFlavor };
public JPanel PanelDestino;
public JPanel PanelOrigen;
public DropTarget dropTarget;
public DropTargetListener dropTargetLis;
     private static final Border border = BorderFactory.createLineBorder(Color.black, 1);
     public MoveableLabel(String text, Icon ic, JPanel DestPanel) {
          super( text, ic, TRAILING);
PanelDestino = DestPanel;
          MouseEventForwarder forwarder = new MouseEventForwarder();
          addMouseListener(forwarder);
          addMouseMotionListener(forwarder);
          setBorder(border);
          setBounds(0,0,50,100);
          setOpaque(true);
setTransferHandler(new TransferHandler("text"));
setBackground( new Color( 57,76,123 ) );
public synchronized DataFlavor[] getTransferDataFlavors() {
     return flavors;
public boolean isDataFlavorSupported(DataFlavor flavor) {
boolean b = false;
b |= flavor.equals(flavors[ FILE ]);
b |= flavor.equals(flavors[STRING]);
b |= flavor.equals(flavors[ IMAGE]);
return (b);
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, java.io.IOException {
return this;
     final class MouseEventForwarder extends MouseInputAdapter {
          public void mousePressed(MouseEvent e) {
               Container parent = getParent();
Container brother = (Container)PanelDestino;
System.out.println( "Parent 1 = " + parent.getName() );
System.out.println( "Destino 1 = " + brother.getName() );
JComponent c = (JComponent) e.getSource();
System.out.println( "getsource() = " + c.getName() );
TransferHandler th = c.getTransferHandler();
th.exportAsDrag( c, e, TransferHandler.COPY_OR_MOVE );
dropTarget = getDropTarget();
System.out.println( "dropTarget.getComponent().getName() = " + dropTarget.getComponent().getName() );
for ( int a=0; a < parent.getComponentCount(); a++ ) {
parent.getComponent( a ).setEnabled( false );
brother.setDropTarget( dropTarget );
System.out.println( "dropTarget.getComponent().getName() = " + dropTarget.getComponent().getName() );
          public void mouseReleased(MouseEvent e) {
               Container parent = getParent();
Container brother = PanelDestino;
System.out.println( "Parent 2 = " + parent.getName() );
System.out.println( "Destino 2 = " + PanelDestino.getName() );
parent.setEnabled( true );
brother.setEnabled( false );
for ( int a=0; a < parent.getComponentCount(); a++ ) {
parent.getComponent( a ).setEnabled( true );
import java.awt.*;
import javax.swing.*;
public class TestDragComponent extends JFrame {
     public TestDragComponent() {
super("TestDragComponent");
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension dm = new Dimension();
dm = tk.getScreenSize();
System.out.println(dm.height);
System.out.println(dm.width );
Container cntn = getContentPane();
cntn.setFont(new Font("Helvetica", Font.PLAIN, 14));
cntn.add(new MoveableComponentsContainer(dm.width,dm.height));
          pack();
          setVisible(true);
     public static void main(String[] args) {
          new TestDragComponent();

Ok I found the answer to your problem. If you download the tutorial they have the code there it's in one folder. I hope this helps.
http://java.sun.com/docs/books/tutorial/

Need help in linking two JPanels

Hi I created a JFrame with layeredpane and I am unable to link the center JPanel to an external JPanel.
private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JPanel jPanel4;
    private javax.swing.JScrollBar jScrollBar1;
    private javax.swing.JScrollBar jScrollBar2;
    private javax.swing.JScrollBar jScrollBar3;
    private javax.swing.JScrollBar jScrollBar4;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
public NewJFrame() {
initComponents();
        jPanel4 = new NewAppletX ();
}New AppletX
    public NewAppletX(){
      JButton jb=new JButton("test button");
      this.add(jb);
      this.setVisible(true);
    }The problem is test button doesnt show up in the screen..
can some one help

It looks like Netbeans generated code, so only the good lord knows. To the original poster: if you want to understand Swing, ditch the code-generation functions of Netbeans and learn to code it on your own. The Sun Java Swing tutorials are a great place to start. Otherwise you'll be fumbling in the dark. Start here:
http://java.sun.com/docs/books/tutorial/uiswing/index.html

How to prevent scrolling if you have two Jpanels in a JScrollPane

I have a JScrollPane with a JPanel for Linenumbers and one for a JTextArea,
each time you have a new line in the JTextarea the propertyListenerEvent call a Method that sets the LineNumbers in the JPanel for Linenumbers, but then you get an unwanted behaviour of the scrollbar: The Scrollbar scrolls down to the last Line. (e.g. if youre writing in the first Line - LineNumber update after pressing return, set's the view to the last Line e.g. 200 - the caret/cursor is on the second) I tried to set the Linenumber Panel not focusable, but it doesn't work. Does anyone got a hint for me?

Thanks for the answers.
@itchyscratchy: didn't get it working with that workarround. but thanks a lot :)
camickr: Since we can't see your code, we can't suggest what you might be doing wrong.I better kick my idea... thought it could be possible like: when
LnNums=false after setLineNum Call in jTPaneCaretUpdate!?
* LineNumberTest.java
* Created on 12. Dezember 2006, 23:40
public class LineNumberTest extends javax.swing.JFrame
    /** Creates new form LineNumberTest */
    public LineNumberTest()
        initComponents();
   // <editor-fold defaultstate="collapsed" desc=" Generated Code ">
    private void initComponents()
    jScrollPane1 = new javax.swing.JScrollPane();
        jPanel1 = new javax.swing.JPanel();
        jTxtArea1 = new javax.swing.JTextArea();
        jTLineNums = new javax.swing.JTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
       jPanel1.setLayout(new java.awt.BorderLayout());
        jTxtArea1.addCaretListener(new javax.swing.event.CaretListener() {
            public void caretUpdate(javax.swing.event.CaretEvent evt)
                jTxtArea1CaretUpdate(evt);
        jPanel1.add(jTxtArea1, java.awt.BorderLayout.CENTER);
        jTLineNums.setBackground(javax.swing.UIManager.getDefaults().getColor("TextField.disabledBackground"));
        jTLineNums.setEditable(false);
        jPanel1.add(jTLineNums, java.awt.BorderLayout.WEST);
        jScrollPane1.setViewportView(jPanel1);
        getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-400)/2, (screenSize.height-300)/2, 400, 300);
    // </editor-fold>
    private void jTxtArea1CaretUpdate(javax.swing.event.CaretEvent evt)
        //Caret
        ci = jTxtArea1.getCaretPosition();
        String sc;
        sc = Integer.toString(ci);
        String s = "0";
        sli=jTxtArea1.getLineCount();
        s = Integer.toString(sli);
        if(LnNums) {
            setLineNums();
           //LnNums =false;
         private void setLineNums()
        jTLineNums.setText("");
        //jTLNums.setFont (new Font (fName, Font.PLAIN, fSize));
        for (int i = 1; i <= sli; i++) {
            jTLineNums.append(i+" \r\n");
        //setFoc ();
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new LineNumberTest().setVisible(true);
    public javax.swing.JPanel jPanel1;
    public javax.swing.JScrollPane jScrollPane1;
    public javax.swing.JTextArea jTLineNums;
    public javax.swing.JTextArea jTxtArea1;
    boolean LnNums = true;
    int iLnNums, iSymBar, iCodeBar, iInv, sli, ci;
}

JTextPane on JPanel with MouseListener doesn't register MouseClicked

I have a JTextPane on a JPanel. The JPanel has a MouseListener on it. If I click anywhere on the JPanel it successfully calls MouseClicked, except when I click on the JPanel over the JTextPane. When I click on the JTextPane, nothing happens. What is it about the JTextPane that my MouseEvents are not being fired when I click on it in the JPanel?
Thanks!

Events go to the component that has focus. By default
a JLabel isn't focusable so I guess the event goes to
the panel.Ok, that's very interesting. I extrapolated that a bit further and set the focusable property of my JTextPane to false, but unfortunately that didn't cause it to behave any more like a JLabel, with respect to the MouseListener on the JPanel.

Formlayout and JPanel

Hi,
Its been some time since I last programmed with Java and I am happy to revisit it, but my knowledge is somewhat rusty. This is so elementary I feel a bit dim for asking it!
I'm trying to create a JApplet which will have two JPanels next to each other, in a FormLayout. The first
JPanel will be something of a canvas allowing the applet to draw images on it; the second is an image that
the routine uploads.
Below is the bare bones programme. I can get the second JPanel to display the image, but the first won't show;
at the moment, its just a simple override of paintComponent showing a green circle to ensure that I can display
something on screen. Is there anything obviously wrong?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class DeaApplet extends JApplet
zapPanel zap_panel;
deaPanel dea_panel;
public void init ()
    Container content_pane = getContentPane ();
    // Grab the image.
    Image img = getImage (getCodeBase (), "zap_perch.PNG");
    // Create an instanceof DrawingPanel
    zap_panel = new zapPanel (img);
    dea_panel = new deaPanel();
    dea_panel.setSize(100,100);
    dea_panel.setVisible(true);
    // Add the DrawingPanel to the content pane.
    content_pane.add (dea_panel);
    content_pane.add (zap_panel);
    content_pane.setVisible(true);
class deaPanel extends JPanel
   deaPanel ()
   public void paintComponent(Graphics g)
       //super.paintComponent(g);
    int width = getWidth();
    int height = getHeight();
    //System.out.println(width);
    g.setColor( Color.GREEN );
    g.drawOval(0, 0, width, height);
class zapPanel extends JPanel implements MouseListener
Image img;
zapPanel (Image img)
{ this.img = img;
public void paintComponent (Graphics g) {
   super.paintComponent (g);
   // Use the image width & height to find the starting point
   int imgX = getSize ().width/2 - img.getWidth (this);
   int imgY = getSize ().height/2 - img.getHeight (this);
   //Draw image centered in the middle of the panel
   g.drawImage (img, imgX, imgY, this);
} // paintComponent
public void mousePressed (MouseEvent e)
public void mouseReleased (MouseEvent e)
public void mouseEntered (MouseEvent e)
public void mouseExited (MouseEvent e)
public void mouseClicked (MouseEvent e)
    //saySomething ("Mouse clicked (# of clicks: "
     //             + e.getClickCount () + ")", e);
    // Between 62,53 and 127,202
      int mx = e.getX();
      int my = e.getY();
}

I'm trying to create a JApplet which will have two JPanels next to each other, in a FormLayout.1. FormLayout isn't a standard JDK class. Why not use one of the standard layouts? For just adding two components side by side, many of them would fit the bill. Or use a JSplitPane if you want the contents to be resizable.
2. The code you posted doesn't in fact use any FormLayout but rather the JApplet's default BorderLayout. So it's expected that you could see only the last component added to the default location of CENTER.\
3. setSize is redundant and undesired when the component is added to a container with a non-null layout manager.

How to embed a Jpanel in JFrame

I have made two JPanel classes
JPanelclass1
JPanelclass2
and a JFrame class
JFrameclass1
in netbean 5.5.1
I want to embed that JPanel in the JFrame and when a button is clicked the ist JPanel dissaper and the second JPanel appears on the same JFrame..... i have tried to declare an object of that JPanel class in the JFrame
Please Help

One word: CardLayout

JPanel problem

I have two JPanels in an applet window. I have attached a mouse event handler to the second JPanel, such that it repaints itself when clicked, or when the mouse moves within it. Trouble is, the contents of the first JPanel(a bunch of JCheckboxes) get painted to the second Panel, before the results of paint() are drawn on top. Why does it do this?

if(evt.getSouce() == Button2) {
remove(myCheckBox);
- and doOtherThings
Checkboxes and textFields have a higher order priority

MouseListener in two JPanels

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