JPanel inside a JFrame

How do you make a JPanel resize automatically with its parent JFrame?
Thanks,
-Zom.

Use BorderLayout for the JFrame and set the JPanel at centre like this:myJFrame.getContentPane().setLayout(new BorderLayout());
myJFrame.getContentPane().add(myPanel, JFrame.CENTER);

Similar Messages

Set size JPanel inside a JFrame

I�m trying to set the size of a custom JPanel inside of a custom JFrame
my code looks like this
public class myFrame extends JFrame
    public myFrame()
     //This set the size of JFrame but i dont want this
        //setSize(300,600);
        //add panel to frame
        MyPanel panel = new myPanel();
        Container contentPane = getContentPane();
        contentPane.add(panel);
class MyPanel extends JPanel
     public MyPanel()
          setSize(300, 600); //This don�t work, why??
          validate();
}Why wont setSize(300, 600) work inside class myPanel ???

@Op
You need to read a tutorial on layout managers. It looks like you don't know how they work.
The panel should call setPreferredSize, and the frame should call pack just before you are displaying the frame.
Kaj

Maximizing JPanel inside a JFrame

Hi guys. I have a jpanel inside a part of a jframe (1/4 of it) and I want to do two things
1) Suppose I have a 'maximize' button inside this jpanel. I want when I press this button to make the jpanel take up the whole jframe's space instead of just 1/4 of it.
2) When I maximize the jframe ( completely different than before) the jpanel's size remains the same. What I want is to make it take as much space as it "deserves" - 1/4 of the jframe.
Could anyone help with these things? Thanks in advance

I am only interested at (1) now. So what I have is a jpanel with flowlayout and two components inside. Another jpanel with flowlayout with a textpane inside and a jpanel with boxlayout that contains the two panels (placed vertically). Finally a jframe that contains this jpanel

Open an applet inside a JFrame?

Hi all!
I know this subject is kind of covered in previous topics, but my situation here is a little different.
I have a TRENDnet TV-IP100 Internet Camera that uses a Java-Applet to show in a browser window the video it captures, using an xview.class file.
I built a swing application that extends JFrame and I want to open in a JPanel, inside the JFrame, the applet-class that my camera uses.
My problem is that I can't take and decompile that class file from the camera, in order to compile from the scratch the Applet; some could say illegal.
So, I wonder if there is a way to open the class file inside my JFrame application. Also, I want to know if I can pass argumets in the JFrame file, like PARAM, NAME, VALUE, as there are important to start the applet.
Thank you all, in advance.
John_Astralidis.

I have not tried this but if the Applet or JApplet class is to be used only as far as a component in a Container (JFrame.getContentPane() returns a Container) I see no problem with explicitly casting into a Panel or even a Container
Panel p=(Panel)theAppletInstance;
this.getContentPane().add(p);//this being the JFrame;There be problem of which I have not considered as the applet class is 'different' to many classes.
Bamkin
Message was edited by:
bamkin-ov-lesta
Container and Panel examples were used as Applet is derived from Panel, which is derived from Containter

Several Jpanels in a JFrame

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();
}

Placing JPanels in a JFrame

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 BorderLayout

Found 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();
}

How do I add multiple JPanels to a JFrame?

I've been trying to do my own little side project to just make something for me and my friends. However, I can't get multiple JPanels to display in one JFrame. If I add more than one JPanel, nothing shows up in the frame. I've tried with SpringLayout, FlowLayout, GridBagLayout, and whatever the default layout for JFrames is. Here is the code that's important:
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.*;
public class CharSheetMain {
      * @param args
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          CharSheetFrame frame=new CharSheetFrame();
          abilityPanel aPanel=new abilityPanel();
          descripPanel dPanel=new descripPanel();
          frame.setLayout(new FlowLayout());
          abilityScore st=new abilityScore();
          abilityScore de=new abilityScore();
          abilityScore co=new abilityScore();
          abilityScore in=new abilityScore();
          abilityScore wi=new abilityScore();
          abilityScore ch=new abilityScore();
          frame.add(aPanel);
          frame.add(dPanel);
          frame.validate();
          frame.repaint();
          frame.pack();
          frame.setVisible(true);
}aPanel and dPanel both extend JPanel. frame extends JFrame. I can get either aPanel or dPanel to show up, but not both at the same time. Can someone tell me what I'm doing wrong?

In the future, Swing related questions should be posted in the Swing forum.
You need to read up on [How to Use Layout Managers|http://download.oracle.com/javase/tutorial/uiswing/layout/index.html]. The tutorial has working example of how to use each layout manager.
By default the content pane of the frame uses a BorderLayout.
For more help create a [SSCCE (Short, Self Contained, Compilable and Executable, Example Program)|http://sscce.org], that demonstrates the incorrect behaviour.
The code you posted in NOT a SSCCE, since we don't have access to any of your custom classes. To do simple tests of adding a panel to frame then just create a panel, give it a preferred size and give each panel a different background color so you can see how it works with your choosen layout manager.

How do I replace one JPanel on a JFrame with another?

I want to replace one JPanel on a JFrame with a different JPanel when the user clicks on a certain menu item. The menu item is working corrrectly but I cant seem to repaint / refresh the component.
My code is as follows:
c.add(knotPanel, BorderLayout.CENTER);
c.add(stepPanel, BorderLayout.NORTH);
     if (stepChoice != 9) {
     c.remove(ownPanel);
     c.add(lessonPanel, BorderLayout.EAST);
     else {
     c.remove(lessonPanel);
     c.add(ownPanel, BorderLayout.EAST);
     c.invalidate();
     c.validate();
     c.update(c.getGraphics());
Any ideas?

I think you should use CardLayout manager.
With CardLayout you can switch beetwen JPanels without removing or adding.

Viewing JavaDoc HTML files inside a JFrame

hi all,
how can I display any of JavaDoc HTML files (as overview-summary.html or index.html) inside a JFrame?
in addition, the user should be able to use hyperlinks.
I used JEditorPane, but in it I can't use hyperlinks.
thanks for your answers. :)

Hey thats something like a bew browser right if you want to i can send you an example for you but i'm curious you want to use JFileChooser or just open the html page like internet and provide links however send me a message to [email protected] to send you the example and watch if it works for you

Having trouble displaying a JPanel on a JFrame

Hello all,
I'm fairly new to Java and I am having trouble displaying a JPanel on a JFrame. Pretty much I have a class called Task which has a JPanel object. Everytime the user creates a new task, a JPanel with the required information is created on screen. However, I cannot get the JPanel to display.
Here is some of the code I have written. If you guys need to see more code to help don't hesitate to ask.
The user enters the information on the form and clicks the createTask button. If the information entered is valid, a new task is created and the initializeTask method is called.
private void createTaskButtonMouseClicked(java.awt.event.MouseEvent evt) {
    if (validateNewTaskEntry())
     String name = nameTextField.getText().trim();
     Date dueDate = dueDateChooser.getDate();
     byte hourDue = Byte.parseByte(hourFormattedTextField.getText());
     byte minuteDue = Byte.parseByte(minuteFormattedTextField.getText());
     String amOrPm = amPmComboBox.getSelectedItem().toString();
     String group = groupComboBox.getSelectedItem().toString();
     numberTasks++;
//     if (numberTasks == 1)
//     else
     Task newTask = new Task(mainForm, name, dueDate, hourDue, minuteDue,
         amOrPm, group);
     newTask.initializeTask();
     this.setVisible(false);
}This is the code that I thought would display the JPanel. If I put this code in anther form's load event it will show the panel with the red border.
public void initializeTask()
     taskPanel = new JPanel();
     taskPanel.setVisible(true);
     taskPanel.setBorder(BorderFactory.createLineBorder(Color.RED));
     taskPanel.setBounds(0,0,50,50);
     taskPanel.setLayout(new BorderLayout());
     mainForm.setLayout(new BorderLayout());
     mainForm.getContentPane().add(taskPanel);
}I was also wondering if this code had anything to do with it:
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new AddTaskForm(new MainForm()).setVisible(true);
    }As you can see I create a new MainForm. The MainForm is where the task is supposed to be drawn. This code is from the AddTaskForm (where they enter all the information to create a new task). I had to do this because AddTaskForm needs to use variables and methods from the MainForm class. I tried passing the mainForm I already created, but I get this error: non-static variable mainForm cannot be referenced from a static context. So to allow the program to compile I passed in new MainForm() instead. However, in my AddTaskForm class constructor, I pass the original MainForm. Here is the code:
public AddTaskForm(MainForm mainForm)
   initComponents();
   numberTasks = 0;
   this.mainForm = mainForm;
}Is a new mainForm actually being created and thats why I can't see the JPanel on the original mainForm? If this is the case, how would I pass the mainForm to addTaskForm? Thanks a ton for any help/suggestions!
Brian

UPDATE
While writing the post an idea popped in my head. I decided to not require a MainForm in the AddTaskForm. Instead to get the MainForm I created an initializeMainForm method.
This is what I mean by not having to pass new MainForm():
    public static void main(String args[])
     java.awt.EventQueue.invokeLater(new Runnable()
         public void run()
          new MainForm().setVisible(true);
    }Even when I don't create the new MainForm() the JPanel still doesn't show up.
Again, thanks for any help.
Brian

How to have focus in 2 JPanels on 1 JFrame?

Hey all..
Like i wrote in the subject, how can i do that?
I have 2 JPanels in 1 JFrame. 1 top JPanel and 1 buttom JPanel. I've a keylistener in top JPanel and a buttonslistener in buttom JPanel. When i press on the button on the buttom JPanel, then my keylistener wont trigger in the top JPanel.
Plz help.
Thx.

The whole point to window focus is to avoid this! There is at most one focused component per window.
As a rule of thumb, when someone uses a KeyListener, they're mistaken. You should be using key binding. This can make your focus problems go away, since you can choose to associate the keyStoke with the whole window, not just the focused component.
[http://java.sun.com/docs/books/tutorial/uiswing/misc/keybinding.html]

Run non-Java program inside a JFrame

A quick question, would it be possible to run a non-java application inside a JFrame? By this, I mean restrict the program to be running only inside that frame.

You could do some of what you need using the JAWT api:
http://download.java.net/jdk6/docs/technotes/guides/awt/AWT_Native_Interface.html
Thanks,
Dmitri
Java2D Team

Plotting Functions inside a JFrame

Hi!,
Right now I'm developing an application and I need to plot the solution of a differentiate equation inside a JFrame... actually any function plotter will do... I recently downlodaded a JAR created by Stanford University called JASHist but I don't feel comfortable with it... is there any package available for download that plots any given function????

You can try out JFreeChart - it's free with complete source code (GNU LGPL):
http://www.object-refinery.com/jfreechart/index.html
There are some links at the bottom of the JFreeChart page for other free chart libraries...for plotting mathematical functions I would recommend looking at PtPlot.
Regards,
Dave Gilbert
www.object-refinery.com

JPanel inside a main JFrame (Internal Panel) realtime graphing

Hello All,
I am looking for assistance. I am working on a project where I need to log realtime stream of data coming from a 3 axis digital accelerometer which is connected to a PIC16F877A I/LP which in turn sends its data packets to an onboard bluetooth module and finally this data should be returned to an internal Jpanel in my GUI application. The issues are: when I click on the menu item to display the internal panel, I need to be able to see the 3 axis data being written onto the Jpanel. This whole process is a bit confusing to me, but I have a feeling it can still be done. Can you help me please?
Mark

rotnevni wrote:
Thanks, the information is very helpful, however please allow me to actually present a question or two. Creating the GUI was pretty easy while using Netbeans IDE 6.7.1, but I'm trying to add the TODO handling code for some menu items in my GUI. For example, how do I launch an internal JPanel that will contain a text area (where the numerical data will display in realtime )? The idea here is when the GUI application is launched, the only thing visible to the user is an empty main frame with a menu bar containing menu items. When a menu item is clicked, a jpanel should appear and have some functionality within the context of that menu item, so each menu item for example, 3 axis mode, numerical mode, pass/fail mode, etc will have their own panel which appears only when that particular menu item is clicked and it appears inside the main frame. I hope I have explained my difficulties well enough to get more of your help. This should be just a simple setter type of call: your internal JPanel will have visibility to your parent, which I will assume, is where you will be collecting the data.
The data from the accelerometer should be output to XML and or text. most preferably XML (two other menu items). Does the use of threads come into play ????
As I become more exposed to writing the code I will improve.Are you using an XML Db, XML files, or are you streaming to one large file.

Putting a jpanel into a jframe

I have a main JFrame which was created by:
public class ControllerGUI extends javax.swing.JFrameand inside this somewhere is a JPanel called myPanel.
I have a seperate class which is a JPanel created by:
public class Calc extends javax.swing.JPanelI am quite new to swing and have been using the GUI builder in Netbeans, so could someone please tell me how to put the seperate Calc JPanel into the JPanel myPanel which is in the JFrame. Is it something to do with creating a container for it? Thanks.
Thanks.

Not sure if you're still around, but here's a very simple example of putting a JPanel derived object into another JPanel. The Calc class here extends JPanel. It does nothing but shows a 3 by 3 grid of JLabels:
import java.awt.Color;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
class Calc extends JPanel
    public Calc()
        setBorder(BorderFactory.createEmptyBorder(15, 0, 15, 0));
        // what the heck, have it show a 3x3 label grid
        setLayout(new GridLayout(0, 3, 10, 10)); // sets layout for the grid
        for (int i = 0; i < 3; i++)
            for (int j = 0; j < 3; j++)
                String labelString = "[" + (i + 1) + ", " + (j + 1) + "]";
                JLabel label = new JLabel(labelString);
                label.setBorder(BorderFactory.createLineBorder(Color.blue));
                label.setHorizontalAlignment(SwingConstants.CENTER);
                add(label); // adds each label to the grid
}Now I'll add it to myPanel which is a JPanel object, but before adding it, I'll set the myPanel's layout to be BorderLayout, and I'll add the Calc class to the CENTER position:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class FooFrame extends JFrame
    // declare and initialize the myPanel JPanel object and
    // the myCalc Calc object:
    private JPanel myPanel = new JPanel();
    private Calc myCalc = new Calc();
    public FooFrame(String s)
        super(s);
        getContentPane().add(myPanel); // add myPanel to the contentPane making it the main panel
        setPreferredSize(new Dimension(500, 400));
        myPanel.setLayout(new BorderLayout()); // here set the layout of mypanel
        myPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
        // create a title panel and add it to the top of myPanel
        JLabel title = new JLabel("Application Title");
        JPanel titlePanel = new JPanel(new FlowLayout()); // redundant since jpanels
                                                        //use flowlayout by default
        titlePanel.add(title);
        myPanel.add(titlePanel, BorderLayout.PAGE_START); // adds title to top of myPanel
        // create a button panel and add it to the bottom of myPanel
        // here we'll use gridlayout
        JPanel buttonPanel = new JPanel(new GridLayout(1, 2, 15, 0));
        JButton okButton = new JButton("OK"); // create buttons
        JButton cancelButton = new JButton("Cancel");
        buttonPanel.add(okButton); // add buttons to button panel
        buttonPanel.add(cancelButton);
        myPanel.add(buttonPanel, BorderLayout.PAGE_END); // adds buttonpanel to bottom of myPanel
        //** add the myCalc object to the center of the myPanel via borderlayout
        myPanel.add(myCalc, BorderLayout.CENTER);
    // initialize and show the JFrame
    private static void createAndShowUI()
        JFrame frame = new FooFrame("FooFrame");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    // but be careful to show the JFrame in a thread-safe manner:
    public static void main(String[] args)
        java.awt.EventQueue.invokeLater(new Runnable()
            public void run()
                createAndShowUI();
}

JPanel inside a JFrame

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