My Jpanel/container disappaer in internalframe
why did my mouse disappaer whan my mouse move out from internalframe?
for note: first time i load internalframe, it's ok. but second time i load internalframe, it's disapppear
this way i load the second time:
jpanel.removeAll();
internlaframe.getContentPane().add(jpanel)
internlaframe.revalidate();
did i wrong?
Edited by: sayunara on Apr 11, 2008 11:23 PM
this the part of my class code, if i post my whole class code, it's to complex
ThumbButton is the JPanel
ThumbButton.box is the Box
ThumbButton.ArrImage is the JButton(ImageIcon)
ThumbFrame is the JInternalframe
and I have a main frame call mainframe, main JPanel call mainpanel
I add mainpanel to mainframe.
mainframe.add(mainpanel);
mainpanel.add(ThumbFrame);
this code i load second time:
ThumbButton.removeAll();
ThumbFrame.validate();
ThumbButton.box = null;
ThumbButton.ArrImage = null;
ThumbButton = null;
System.gc();
ThumbButton = new thumbnail();
ThumbButton.setSize(new Dimension(950, 650));
ThumbFrame.getContentPane().add(ThumbButton);
ThumbButton.requestFocus();
ThumbButton.revalidate();
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[1]. main Program:
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import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
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[2]. Program 2:
package swing.com.test.test;
//File System Tree
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.io.File;
import java.util.Iterator;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.JPanel;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import java.io.Serializable;
public class ListPanel extends JPanel implements Serializable{
protected JTree fileTree;
private FileSystemModel fileSystemModel;
private JTextArea ltextArea = new JTextArea();
protected JTextArea fileDetailsTextArea = new JTextArea();
private String str = "";
public String getlTextArea() {
//textArea.getText();
return str;
public String setlTextArea(String ta) {
ltextArea.setText(ta);
str = ta;
return str;
public ListPanel(String directory) {
//super("JTree FileSystem Viewer");
setLayout(new BorderLayout());
final JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
add(panel, BorderLayout.CENTER);
fileDetailsTextArea.setEditable(false);
fileSystemModel = new FileSystemModel(new File(directory));
fileTree = new JTree(fileSystemModel);
fileTree.setEditable(true);
fileTree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent event) {
System.out.println("1. What we save is: getlTextArea() =" + getlTextArea() );
File file = (File) fileTree.getLastSelectedPathComponent();
fileDetailsTextArea.setText(getFileDetails(file));
final ListRightPanel lrp = new ListRightPanel(this);
lrp.textArea.setText(getFileDetails(file));
setlTextArea(getFileDetails(file));
System.out.println("2. What we save is: getlTextArea() =" + getlTextArea() );
final JSplitPane splitPane = new JSplitPane();
panel.add(splitPane, BorderLayout.CENTER);
final JPanel panel_1 = new JPanel();
splitPane.setLeftComponent(panel_1);
panel_1.add(new JScrollPane(fileTree));
final JPanel panel_2 = new JPanel();
splitPane.setRightComponent(panel_2);
panel_2.add(new JScrollPane(fileDetailsTextArea));
setVisible(true);
private String getFileDetails(File file) {
if (file == null)
return "";
StringBuffer buffer = new StringBuffer();
if (file.listFiles()!=null){
for (int i=0; i< file.listFiles().length; i++){
buffer.append(((file.listFiles())) + "\n");
System.out.println("List all files");
return buffer.toString();
public static void main(String args[]) {
new ListPanel("c:\\");
class FileSystemModel implements TreeModel {
private File root;
private Vector listeners = new Vector();
public FileSystemModel(File rootDirectory) {
root = rootDirectory;
public Object getRoot() {
return root;
public Object getChild(Object parent, int index) {
File directory = (File) parent;
String[] children = directory.list();
return new TreeFile(directory, children[index]);
public int getChildCount(Object parent) {
File file = (File) parent;
if (file.isDirectory()) {
String[] fileList = file.list();
if (fileList != null)
return file.list().length;
return 0;
public boolean isLeaf(Object node) {
File file = (File) node;
return file.isFile();
public int getIndexOfChild(Object parent, Object child) {
File directory = (File) parent;
File file = (File) child;
String[] children = directory.list();
for (int i = 0; i < children.length; i++) {
if (file.getName().equals(children[i])) {
return i;
return -1;
public void valueForPathChanged(TreePath path, Object value) {
File oldFile = (File) path.getLastPathComponent();
String fileParentPath = oldFile.getParent();
String newFileName = (String) value;
File targetFile = new File(fileParentPath, newFileName);
oldFile.renameTo(targetFile);
File parent = new File(fileParentPath);
int[] changedChildrenIndices = { getIndexOfChild(parent, targetFile) };
Object[] changedChildren = { targetFile };
fireTreeNodesChanged(path.getParentPath(), changedChildrenIndices, changedChildren);
private void fireTreeNodesChanged(TreePath parentPath, int[] indices, Object[] children) {
TreeModelEvent event = new TreeModelEvent(this, parentPath, indices, children);
Iterator iterator = listeners.iterator();
TreeModelListener listener = null;
while (iterator.hasNext()) {
listener = (TreeModelListener) iterator.next();
listener.treeNodesChanged(event);
public void addTreeModelListener(TreeModelListener listener) {
listeners.add(listener);
public void removeTreeModelListener(TreeModelListener listener) {
listeners.remove(listener);
private class TreeFile extends File {
public TreeFile(File parent, String child) {
super(parent, child);
public String toString() {
return getName();
[3]. Program 3:
package swing.com.test.test;
import java.awt.BorderLayout;
import java.io.File;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import java.io.Serializable;
public class ListRightPanel extends JPanel implements TreeSelectionListener, Serializable{
protected JTextArea textArea;
// protected ListAllFile laf;
private String str = "";
public String getlTextArea() {
//textArea.getText();
return str;
public String setlTextArea(String ta) {
str = ta;
return str;
* Create the panel
public ListRightPanel(ListPanel laff) {
super();
setLayout(new BorderLayout());
final JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
add(panel, BorderLayout.CENTER);
textArea = new JTextArea();
final String st = laff.getlTextArea();
System.out.println("####################################");
System.out.println("st=" + st);
laff.fileTree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent event) {
//laff.textArea.setText(getFileDetails(file));
textArea.setText(getlTextArea());
System.out.println("ListRightPanel Was Invoked from ListPanel!!getlTextArea() =" + getlTextArea() );
System.out.println("st=" + st);
panel.add(textArea, BorderLayout.CENTER);
public void valueChanged(TreeSelectionEvent e){};
It is runnable program, just compile and run it in Console is ok,
Regards
SunnyThnaks, code post again, see
[1]. package swing.com.test.test;
import javax.swing.JFrame;
import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
import java.io.Serializable;
import swing.com.test.test.ListPanel;
import java.awt.GridLayout;
public class ListPanelMain implements java.io.Serializable{
private JFrame frame;
* Launch the application
* @param args
public static void main(String args[]) {
try {
ListPanelMain window = new ListPanelMain();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
* Create the application
public ListPanelMain() {
initialize();
* Initialize the contents of the frame
private void initialize() {
frame = new JFrame("FileTreePanelMain");
frame.setBounds(100, 100, 900, 675);
// FieTreePanelComm ftreecomm = new FieTreePanelComm();
ListPanel ftree = new ListPanel("C:\\");
// ListAllFile ftree = new ListAllFile("C:\\");
// FileTreePanelText fileTreePanelText = new FileTreePanelText(ftreecomm);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JPanel panel = new JPanel();
panel.setLayout(new GridLayout(0, 2));
frame.getContentPane().add(panel, BorderLayout.CENTER);
// final JSplitPane splitPane = new JSplitPane();
// frame.getContentPane().add(splitPane, BorderLayout.CENTER);
// splitPane.setLeftComponent(ftree);
panel.add(ftree);
final ListRightPanel listRightPanel = new ListRightPanel(ftree);
//splitPane.setRightComponent(listRightPanel);
panel.add(listRightPanel);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.pack();
frame.setVisible(true);
}[2] Program 2
package swing.com.test.test;
//File System Tree
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.io.File;
import java.util.Iterator;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.JPanel;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import java.io.Serializable;
public class ListPanel extends JPanel implements Serializable{
protected JTree fileTree;
private FileSystemModel fileSystemModel;
private JTextArea ltextArea = new JTextArea();
protected JTextArea fileDetailsTextArea = new JTextArea();
private String str = "";
public String getlTextArea() {
//textArea.getText();
return str;
public String setlTextArea(String ta) {
ltextArea.setText(ta);
str = ta;
return str;
public ListPanel(String directory) {
//super("JTree FileSystem Viewer");
setLayout(new BorderLayout());
final JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
add(panel, BorderLayout.CENTER);
fileDetailsTextArea.setEditable(false);
fileSystemModel = new FileSystemModel(new File(directory));
fileTree = new JTree(fileSystemModel);
fileTree.setEditable(true);
fileTree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent event) {
System.out.println("1. What we save is: getlTextArea() =" + getlTextArea() );
File file = (File) fileTree.getLastSelectedPathComponent();
fileDetailsTextArea.setText(getFileDetails(file));
final ListRightPanel lrp = new ListRightPanel(this);
lrp.textArea.setText(getFileDetails(file));
setlTextArea(getFileDetails(file));
System.out.println("2. What we save is: getlTextArea() =" + getlTextArea() );
final JSplitPane splitPane = new JSplitPane();
panel.add(splitPane, BorderLayout.CENTER);
final JPanel panel_1 = new JPanel();
splitPane.setLeftComponent(panel_1);
panel_1.add(new JScrollPane(fileTree));
final JPanel panel_2 = new JPanel();
splitPane.setRightComponent(panel_2);
panel_2.add(new JScrollPane(fileDetailsTextArea));
setVisible(true);
private String getFileDetails(File file) {
if (file == null)
return "";
StringBuffer buffer = new StringBuffer();
if (file.listFiles()!=null){
for (int i=0; i< file.listFiles().length; i++){
buffer.append(((file.listFiles())) + "\n");
System.out.println("List all files");
return buffer.toString();
public static void main(String args[]) {
new ListPanel("c:\\");
class FileSystemModel implements TreeModel {
private File root;
private Vector listeners = new Vector();
public FileSystemModel(File rootDirectory) {
root = rootDirectory;
public Object getRoot() {
return root;
public Object getChild(Object parent, int index) {
File directory = (File) parent;
String[] children = directory.list();
return new TreeFile(directory, children[index]);
public int getChildCount(Object parent) {
File file = (File) parent;
if (file.isDirectory()) {
String[] fileList = file.list();
if (fileList != null)
return file.list().length;
return 0;
public boolean isLeaf(Object node) {
File file = (File) node;
return file.isFile();
public int getIndexOfChild(Object parent, Object child) {
File directory = (File) parent;
File file = (File) child;
String[] children = directory.list();
for (int i = 0; i < children.length; i++) {
if (file.getName().equals(children[i])) {
return i;
return -1;
public void valueForPathChanged(TreePath path, Object value) {
File oldFile = (File) path.getLastPathComponent();
String fileParentPath = oldFile.getParent();
String newFileName = (String) value;
File targetFile = new File(fileParentPath, newFileName);
oldFile.renameTo(targetFile);
File parent = new File(fileParentPath);
int[] changedChildrenIndices = { getIndexOfChild(parent, targetFile) };
Object[] changedChildren = { targetFile };
fireTreeNodesChanged(path.getParentPath(), changedChildrenIndices, changedChildren);
private void fireTreeNodesChanged(TreePath parentPath, int[] indices, Object[] children) {
TreeModelEvent event = new TreeModelEvent(this, parentPath, indices, children);
Iterator iterator = listeners.iterator();
TreeModelListener listener = null;
while (iterator.hasNext()) {
listener = (TreeModelListener) iterator.next();
listener.treeNodesChanged(event);
public void addTreeModelListener(TreeModelListener listener) {
listeners.add(listener);
public void removeTreeModelListener(TreeModelListener listener) {
listeners.remove(listener);
private class TreeFile extends File {
public TreeFile(File parent, String child) {
super(parent, child);
public String toString() {
return getName();
[3] Program 3:
package swing.com.test.test;
import java.awt.BorderLayout;
import java.io.File;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import java.io.Serializable;
public class ListRightPanel extends JPanel implements TreeSelectionListener, Serializable{
protected JTextArea textArea;
// protected ListAllFile laf;
private String str = "";
public String getlTextArea() {
//textArea.getText();
return str;
public String setlTextArea(String ta) {
str = ta;
return str;
* Create the panel
public ListRightPanel(ListPanel laff) {
super();
setLayout(new BorderLayout());
final JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
add(panel, BorderLayout.CENTER);
textArea = new JTextArea();
final String st = laff.getlTextArea();
System.out.println("####################################");
System.out.println("st=" + st);
laff.fileTree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent event) {
//laff.textArea.setText(getFileDetails(file));
textArea.setText(getlTextArea());
System.out.println("ListRightPanel Was Invoked from ListPanel!!getlTextArea() =" + getlTextArea() );
System.out.println("st=" + st);
panel.add(textArea, BorderLayout.CENTER);
public void valueChanged(TreeSelectionEvent e){};
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Thanks,
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How to repaint a JPanel in bouncing balls game?
I want to repaint the canvas panel in this bouncing balls game, but i do something wrong i don't know what, and the JPanel doesn't repaint?
The first class defines a BALL as a THREAD
If anyone knows how to correct the code please to write....
package fuck;
//THE FIRST CLASS
class CollideBall extends Thread{
int width, height;
public static final int diameter=15;
//coordinates and value of increment
double x, y, xinc, yinc, coll_x, coll_y;
boolean collide;
Color color;
Rectangle r;
bold BouncingBalls balls; //A REFERENCE TO SECOND CLASS
//the constructor
public CollideBall(int w, int h, int x, int y, double xinc, double yinc, Color c, BouncingBalls balls) {
width=w;
height=h;
this.x=x;
this.y=y;
this.xinc=xinc;
this.yinc=yinc;
this.balls=balls;
color=c;
r=new Rectangle(150,80,130,90);
public double getCenterX() {return x+diameter/2;}
public double getCenterY() {return y+diameter/2;}
public void move() {
if (collide) {
x+=xinc;
y+=yinc;
//when the ball bumps against a boundary, it bounces off
//bounce off the obstacle
public void hit(CollideBall b) {
if(!collide) {
coll_x=b.getCenterX();
coll_y=b.getCenterY();
collide=true;
public void paint(Graphics gr) {
Graphics g = gr;
g.setColor(color);
//the coordinates in fillOval have to be int, so we cast
//explicitly from double to int
g.fillOval((int)x,(int)y,diameter,diameter);
g.setColor(Color.white);
g.drawArc((int)x,(int)y,diameter,diameter,45,180);
g.setColor(Color.darkGray);
g.drawArc((int)x,(int)y,diameter,diameter,225,180);
g.dispose(); ////////
///// Here is the buggy code/////
public void run() {
while(true) {
try {Thread.sleep(15);} catch (Exception e) { }
synchronized(balls)
move();
balls.repairCollisions(this);
paint(balls.gBuffer);
balls.canvas.repaint();
//THE SECOND CLASS
public class BouncingBalls extends JFrame{
public Graphics gBuffer;
public BufferedImage buffer;
private Obstacle o;
private List<CollideBall> balls=new ArrayList();
private static final int SPEED_MIN = 0;
private static final int SPEED_MAX = 15;
private static final int SPEED_INIT = 3;
private static final int INIT_X = 30;
private static final int INIT_Y = 30;
private JSlider slider;
private ChangeListener listener;
private MouseListener mlistener;
private int speedToSet = SPEED_INIT;
public JPanel canvas;
private JPanel p;
public BouncingBalls() {
super("fuck");
setSize(800, 600);
p = new JPanel();
Container contentPane = getContentPane();
final BouncingBalls xxxx=this;
o=new Obstacle(150,80,130,90);
buffer=new BufferedImage(getSize().width, getSize().height, BufferedImage.TYPE_INT_RGB);
gBuffer=buffer.getGraphics();
//JPanel canvas start
final JPanel canvas = new JPanel() {
final int w=getSize().width-5;
final int h=getSize().height-5;
@Override
public void update(Graphics g)
paintComponent(g);
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
gBuffer.setColor(Color.ORANGE);
gBuffer.fillRect(0,0,getSize().width,getSize().height);
gBuffer.draw3DRect(5,5,getSize().width-10,getSize().height-10,false);
//paint the obstacle rectangle
o.paint(gBuffer);
g.drawImage(buffer,0,0, null);
//gBuffer.dispose();
};//JPanel canvas end
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
addButton(p, "Start", new ActionListener() {
public void actionPerformed(ActionEvent evt) {
CollideBall b = new CollideBall(canvas.getSize().width,canvas.getSize().height
,INIT_X,INIT_Y,speedToSet,speedToSet,Color.BLUE,xxxx);
balls.add(b);
b.start();
contentPane.add(canvas, "Center");
contentPane.add(p, "South");
public void addButton(Container c, String title, ActionListener a) {
JButton b = new JButton(title);
c.add(b);
b.addActionListener(a);
public boolean collide(CollideBall b1, CollideBall b2) {
double wx=b1.getCenterX()-b2.getCenterX();
double wy=b1.getCenterY()-b2.getCenterY();
//we calculate the distance between the centers two
//colliding balls (theorem of Pythagoras)
double distance=Math.sqrt(wx*wx+wy*wy);
if(distance<b1.diameter)
return true;
return false;
synchronized void repairCollisions(CollideBall a) {
for (CollideBall x:balls) if (x!=a && collide(x,a)) {
x.hit(a);
a.hit(x);
public static void main(String[] args) {
JFrame frame = new BouncingBalls();
frame.setVisible(true);
} And when i press start button:
Exception in thread "Thread-2" java.lang.NullPointerException
at fuck.CollideBall.run(CollideBall.java:153)
Exception in thread "Thread-3" java.lang.NullPointerException
at fuck.CollideBall.run(CollideBall.java:153)
Exception in thread "Thread-4" java.lang.NullPointerException
at fuck.CollideBall.run(CollideBall.java:153)
and line 153 is: balls.canvas.repaint(); in Method run() in First class.
Please help.public RepaintManager manager;
public BouncingBalls() {
manager = new RepaintManager();
manager.addDirtyRegion(canvas, 0, 0,canvas.getSize().width, canvas.getSize().height);
public void run() {
while(true) {
try {Thread.sleep(15);} catch (Exception e) { }
synchronized(balls)
move();
balls.repairCollisions(this);
paint(balls.gBuffer);
balls.manager.paintDirtyRegions(); //////// line 153
but when push start:
Exception in thread "Thread-2" java.lang.IllegalMonitorStateException
at java.lang.Object.notifyAll(Native Method)
at fuck.CollideBall.run(CollideBall.java:153)
Exception in thread "Thread-3" java.lang.IllegalMonitorStateException
at java.lang.Object.notifyAll(Native Method)
at fuck.CollideBall.run(CollideBall.java:153)
i'm newbie with Concurrency and i cant handle this exceptons.
Is this the right way to do repaint? -
Why doesn't the Card show up from the CardLayout:used JPanel,JFrame
hello guys,
this is a question regarding. As I did not get nice responses i am posting again today.
http://forum.java.sun.com/thread.jsp?forum=57&thread=235761
Hi, I would like to re-arrange my question and put it in a simpler way. I have a frame(mainframes.java) with border layout. There is a panel on the west(borderlayout.west) which has a few buttons. The center panel(borderlayout.center) has a cardlayout and needless to mention that it contains a deck of panels. When I click on a button in the left panel, an appropriate panel in the deck should be displayed in the center panel. It's all simple so far, but here comes the real problem. I have designed my application in such a way that I have each of my panels in a separate class(each of which extend JPanel) and I am trying to integrate them all in my frame. When I click on the button on the left panel(p.s.:this panel is also in a separate class), then the appropriate panel should be displayed in the frame(i.e. in the center deck).
mainframes.java:-
//This is the local method which takes an argument from the invoking panel and displays the corresponding card in the deck.
void showpanel(String p1)
this.cardLayout2.show(CENTERPANEL,p1);
System.out.println("Inside showpanel "+ p1);
leftpanel.java:-
void B_LOGIN_actionPerformed(ActionEvent e) {
new mainframes().showpanel("lp");
// I am trying to display the card "lp" when I click on a button in the leftpanel, but I can only get the console output as "Inside showpanel lp". This shows that the method showpanel(String lp) is getting invoked but the required card is not being displayed. i.e. this.cardLayout2.show(CENTERPANEL,p1) seems to be not working.
Thanks for your time. Mail me, if you want to access the complete code, at [email protected]I'd check to make sure 3 things...
1) You have added your Panels to the CardLayout Panel
2) You have added the CardLayoutPanel to the center of your BorderLayout JPanel
3) Try giving calls to validate()/invalidate() on the JPanel containing the CardLayoutPanel
void showpanel(String p1)
... invalidate()
this.cardLayout2.show(CENTERPANEL,p1);
System.out.println("Inside showpanel "+ p1);
... validate()
Otherwise, I may just need to check your source code, you can send to [email protected] -
Hi,
In my program I plan to put JPanels, containing Traffic Lights (data calculated somewhere else in my program) inside a JFrame. At the moment I have a problem with getting the panels where I want them.
When I construct the JFrame, I set its size to be screen wide, and a bit less higher than screen height:
public class TlsFrame extends JFrame implements WindowListener,
Observer {
private JComponent component;
public TlsFrame (String title, TlsModel theModel, TlsView theView) {
super(title);
model = theModel;
model.addObserver(this);
view = theView;
// Default close operation
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addWindowListener (new CloseListener() );
setup();
private void setup () {
setBackground (Color.WHITE);
setLayout(new GridBagLayout());
// Set the size of the window so in covers the whole screen
dimension = Toolkit.getDefaultToolkit().getScreenSize();
setBounds (0, 0, dimension.width, dimension.height - 200);
// Create the Menu bar
tlsMenu = new TlsMenu(model);
tlsMenu.createMenuBar();
// Create the Panel used to log in (replaced later with the traffic lights)
logInPanel = new LogInPanel(model);
add(logInPanel);
logInPanel.requestFocusInWindow();
setVisible (true);
}After logging in, I am ready to display the traffic lights:
private void setUpTrafficLights() {
// Remove all previous traffic lights from the panel
if (component != null) {
removeAll();
component = createComponent();
add(component);
setVisible (true);
private JComponent createComponent () {
JPanel panel = new JPanel ();
panel.setBounds (0, 0, dimension.width, 300);
// X coordinate for the different traffic lights
int xCoordinate = 0;
// Add the Customers as TrafficLights to the panel
for (int i = 0; i < view.getTrafficLights().size(); i++) {
TrafficLight light = (TrafficLight) view.getTrafficLights().get(i);
light.setBounds(INSETS + xCoordinate, INSETS, light.getWidth(), light.getHeight());
System.out.printoln ("info", "TlsFrame.createComponent: light.getBounds()=" + light.getBounds());
xCoordinate += light.getWidth();
panel.add(light);
return panel;
}The logging I get about this part is:
TlsFrame.createComponent: light.getBounds()=java.awt.Rectangle[x=2,y=2,width=144,height=266]
TlsFrame.createComponent: light.getBounds()=java.awt.Rectangle[x=146,y=2,width=100,height=266]
TlsFrame.createComponent: light.getBounds()=java.awt.Rectangle[x=246,y=2,width=108,height=266]But although I place my TrafficLight's to be placed on the top row, they are placed in the middle of my screen. And that is not what I expected. Is there a LayoutManager I need to set, or set to null (tried it, but that did not help)?
Abel
Edited by: Abel on Feb 12, 2008 9:31 AM
I just found out I use the BorderLayoutFound it.
private void setUpTrafficLights() {
// Remove all previous traffic lights from the panel
if (component != null) {
removeAll();
component = createComponent();
add(component);
this.setLayout(null);
addItem ("info", "TrlsFrame.setUpTrafficLights: current layoutManager is " +
this.getLayout());
setVisible (true);
}Logging is your friend:
while (problemNotFound) {
addLogging();
} -
AddMouseListener disable events of bottom multiple non opaque JPanel
Hi fellow developpers..
I'm creating an application in which I'm using a JPanel containing multiple JPanel ( a layered system ) with some components laid on them. Everything works fine, events are properly traversing non opaque multiple JPanel, and I can access components of bottom most to top most JPanels.
But when I'm adding MouseListeners on my non opaque JPanels, mouse events are no more going through them, only the top most one is receiving events.. my JPanels are still non opaque because I can see through them but mouse events are working as if they were opaque.
Is there a trick to catch mouse events on non opaque JPanel without blocking event traversing ?
Alexis.How about this?
final ListView<Node> fileList = new ListView<Node>();
fileList.getSelectionModel().selectedIndexProperty().addListener(new ChangeListener<Number>() {
@Override
public void changed(ObservableValue<? extends Number> observableValue, Number oldv, Number newv) {
if (newv.intValue() == 4) {
fileList.getSelectionModel().select(oldv.intValue());
}); -
Hi,
I have three buttons in Jtoolbar and a JPanel inside a JFrame. Now my program is supposed to work in the follwoing way-
when I click a button a new JPanel containing general information comes in that fixed Jpanel place in that JFrame.
When I press another button "a form" should come.
When I press the third button then the a Jtable will come.
Now all these should come in the same place inside that JFrame. So, when I press the JToggleButtons then how to call and set up so that the Jpanels replace each other?
Please post some example if possible along with your advice.
Thanks a lot in advance.I figured what the heck, here's a trivial example of card layout:
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
* main jpanel that is added to a jframe's contentPane
* this main panel uses a borderlayout and places a label
* in the north position, a swap button in the south
* position, and a jpanel in the center position that uses
* the cardlayout.
* @author Pete
public class CardPracticeMainPanel extends JPanel
private static final long serialVersionUID = 1L;
private JButton swapButton = new JButton("Swap Panels");
private CardLayout cardlayout = new CardLayout();
private JPanel cardLayoutPanel = null;
public CardPracticeMainPanel()
int ebGap = 20;
setBorder(BorderFactory.createEmptyBorder(ebGap, ebGap, ebGap, ebGap));
setLayout(new BorderLayout());
cardLayoutPanel = createCardLayoutPanel();
add(createNorthPanel(), BorderLayout.NORTH);
add(cardLayoutPanel, BorderLayout.CENTER);
add(createSouthPanel(), BorderLayout.SOUTH);
public void addCard(JPanel panel, String string)
cardLayoutPanel.add(panel, string);
private JPanel createNorthPanel()
JPanel p = new JPanel();
JLabel titleLabel = new JLabel("CardLayout Practice Program");
titleLabel.setFont(new Font(Font.DIALOG, Font.BOLD, 24));
p.add(titleLabel);
return p;
private JPanel createCardLayoutPanel()
JPanel p = new JPanel();
p.setLayout(cardlayout);
return p;
private JPanel createSouthPanel()
JPanel p = new JPanel();
p.add(swapButton);
swapButton.addActionListener(new SwapButtonListener());
return p;
private class SwapButtonListener implements ActionListener
public void actionPerformed(ActionEvent arg0)
cardlayout.next(cardLayoutPanel);
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
* the "driver" program that creates a JFrame and places a
* CardPracticeMainPanel into the contentpane of this jframe.
* It also adds JPanel "cards" to the CardPracticeMainPanel object.
* @author Pete
public class CardPracticeTest
private static Random rand = new Random();
private static void createAndShowGUI()
// create the main panel and add JPanel "cards" to it
CardPracticeMainPanel mainPanel = new CardPracticeMainPanel();
for (int i = 0; i < 4; i++)
JPanel card = new JPanel();
card.setPreferredSize(new Dimension(600, 400));
card.setBorder(BorderFactory.createLineBorder(Color.blue));
String panelString = "panel " + String.valueOf(i + 1);
card.add(new JLabel(panelString));
mainPanel.addCard(card, panelString);
card.setBackground(new Color(
127 * rand.nextInt(3),
127 * rand.nextInt(3),
127 * rand.nextInt(3)));
JFrame frame = new JFrame("CardLayout Practice Application");
frame.getContentPane().add(mainPanel); // add main to jframe
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
// let's show the jframe in a thread-safe manner
public static void main(String[] args)
EventQueue.invokeLater(new Runnable()
public void run()
createAndShowGUI();
} -
How to add 3 jpanels into 1principal jpanel
Hi, I have a situation with some panels:
there are 3 jpanels, each one has 3 jbuttons inside; and there is 1 jpanel that contains a JLabel with an image.
My question is:
How can I put into the jpanel ppal the 3 jpanels with button; and then this jpanel container put into the main jframe class?
Regardsstudy and learn the Swing layout managers. you can find a decent tutorial on this on the Sun tutorial site.
-
Set a FocusTraversalPolicy for each of the JPanels
I have a JInternalFrame that contains a JTabbedPanel that contains 1...n JPanels
I want to set a FocusTraversalPolicy for each of the JPanels
independently.
Each JTabbedPanel has many JComponents.
Please help MEI don't know much about JTabbedPanel but I imagine you can get each of the JPanels contained in it. So couldn't you just set FocusTraversalPolicy for each of them? I guess I really don't understand what the problem here is.
-
Hi,
Yesterday I had a problem with a Traffic Light I am creating, as a part of a bigger project. I got helped (thanks for the help), and that problem is solved. Today I noticed something else. The construction I use is a JPanel, containing a button above a traffic light. The button contains a customer name. Under this button, the traffic light displays the severity of a customer problem. What I noticed is that the space to the right of the button is bigger than the space to the left of the button. This problem does not exist when I use a Gridlayout. I use the Boxlayout so the button does not get the same size as the lights of the traffic lights. Does anyone know what I can do to get that space to the right of the button away?
The code (which should compile and run without a problem) I use is:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
* Temporary class to be loaded into the TlsFrame for testing purposes
public class TrafficLight extends JPanel
implements ActionListener {
private Border raisedBevel;
private JButton tlsButton;
private JComponent component;
private TlsLight redLight;
private TlsLight yellowLight;
private TlsLight greenLight;
private String name;
private String problemLevel;
private boolean isNewProblem;
public TrafficLight (String theName, String theProblemLevel, boolean theNewProblem) {
name = theName;
problemLevel = theProblemLevel;
isNewProblem = theNewProblem;
// Create the borders
raisedBevel = BorderFactory.createRaisedBevelBorder();
setUp();
* Places all items on this Panel.
private void setUp() {
component = createComponent();
add(component);
if (isNewProblem)
component.setBackground(Color.GRAY);
else
component.setBackground(Color.BLACK);
setVisible (true);
private JComponent createComponent () {
// JPanel panel = new JPanel( new GridLayout(4, 1) );
JPanel panel = new JPanel ();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
panel.setBorder(raisedBevel);
// Create the button containing the Customer name
tlsButton = new JButton(name);
tlsButton.setActionCommand(name);
tlsButton.addActionListener(this);
panel.add(tlsButton);
// Create the lights
boolean isOn = true;
boolean isNewProblem = true;
redLight = new TlsLight (Color.RED, isOn, isNewProblem);
panel.add(redLight);
yellowLight = new TlsLight (Color.YELLOW, !isOn, isNewProblem);
panel.add(yellowLight);
greenLight = new TlsLight (Color.GREEN, isOn, !isNewProblem);
panel.add(greenLight);
return panel;
public void actionPerformed(ActionEvent event) {
String command = event.getActionCommand();
if (name.equals(command)) {
component.setBackground (Color.BLACK);
// Set redLight to black and greenLights background to gray
redLight.setLight(false);
redLight.setBackground(false);
yellowLight.setBackground(false);
greenLight.setBackground(false);
repaint();
static public class TlsLight extends JPanel {
protected boolean isOn;
protected boolean isNewProblem;
protected int xPos;
protected int yPos;
protected int width = 80;
protected int height = 80;
protected Dimension preferredSize;
protected Color theColor;
protected Color background;
private int insets = width/20;
public TlsLight (Color aColor, boolean lightIsOn, boolean hasNewProblem) {
theColor = aColor;
isOn = lightIsOn;
isNewProblem = hasNewProblem;
preferredSize = new Dimension( width, height );
public Dimension getPreferredSize() {
return preferredSize;
public void paint (Graphics graphics) {
int diameter = width - 2 * insets;
// Paint the background (square) based on Customer having a new problem or not
if(isNewProblem) {
background = Color.GRAY;
else {
background = Color.BLACK;
graphics.setColor(background);
graphics.fillRect(xPos + 10, yPos, width, height);
// Set color light based on problemStatus
if(isOn) {
graphics.setColor(theColor);
} else {
graphics.setColor(background);
graphics.fillOval(xPos + insets + 10, yPos + insets, diameter, diameter);
// Set the background of the light
graphics.setColor(Color.WHITE);
// Paint the background
graphics.drawOval(xPos + insets + 10, yPos + insets, diameter, diameter);
public void setLight (boolean setLight) {
isOn = setLight;
public void setBackground (boolean setBackground) {
isNewProblem = setBackground;
public static void main (String [] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
TrafficLight light = new TrafficLight("A Customer", "ERR", true);
frame.add(light);
frame.pack();
frame.setVisible(true);
}The code contains both layouts, so it should not be a big problem to see what I mean. Hope someone can help me.
TIA,
AbelNest panels and layouts. Put the button in its own jpanel, set the panel's opaque to false so the underlying color comes through and then add the panel to the main panel:
// Create the button containing the Customer name
tlsButton = new JButton(name);
tlsButton.setActionCommand(name);
tlsButton.addActionListener(this);
//using flowlayout is redundant here -- it's the default layout
// but i'm doing this to illustrate what's happening.
JPanel btnPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
btnPanel.setOpaque(false); // so underlying color isn't changed
btnPanel.add(tlsButton);
panel.add(btnPanel);
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