Layout Problem

[Chirag Jakharia]

I have a total of three classes
two of them extends JPanel
and one of them extends JFrame
Classes Extends to JPanel
--------------------------
DerivedLabelText
DerivedNames
Classes Extends to JFrame
--------------------------
Test
There are 2 panels in DerivedNames and both of them are of DerivedLabelText type. They are arranged in GridLayout in DerivedNames.
A Panel of type DerivedNames is placed into Test JFrame and there is null layout. When the frame is resized the panel's size is made equal to JFrame's size.Now the problem is When we resize the Frame i.e. Test the Panel i.e. DerivedNames is also resized but the Panels i.e. DerivedLabelText in DerivedNames does not increases its width or height at that time.
According to me that should have happened due to Layout
The following is the code
DerivedLabelText

  
/*
 * DerivedLabelText.java
 *
 * Created on April 14, 2004, 10:17 AM
 */
package BeanPract.PRACTICE;
/**
 *
 * @author  SpShah
 */
public class DerivedLabelText extends javax.swing.JPanel {
    
    /** Creates new form DerivedLabelText */
    public DerivedLabelText() {
        constructor();
    }
    
    /** Creates new form DerivedLabelText */
    public DerivedLabelText(java.lang.String mstrLabelCaption,java.lang.String mstrTextCaption) {
        constructor(mstrLabelCaption,mstrTextCaption);
    }
    
    /** Creates new form DerivedLabelText */
    public DerivedLabelText(java.lang.String mstrLabelCaption) {
        constructor(mstrLabelCaption);
    }
    
    /** Creates new form DerivedLabelText */
    public DerivedLabelText(java.lang.String mstrLabelCaption,java.lang.String mstrTextCaption,int mintLabelWidth) {
        constructor(mstrLabelCaption,mstrTextCaption,mintLabelWidth);
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {
        jlblName = new javax.swing.JLabel();
        jtxfName = new javax.swing.JTextField();
        setLayout(null);
        setBackground(java.awt.Color.cyan);
        addComponentListener(new java.awt.event.ComponentAdapter() {
            public void componentResized(java.awt.event.ComponentEvent evt) {
                DerivedLabelTextComponentListener(evt);
            }
        });
        jlblName.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jlblName.setText("Name");
        add(jlblName);
        jlblName.setBounds(0, 0, 40, 20);
        jtxfName.setColumns(30);
        jtxfName.setMinimumSize(new java.awt.Dimension(10, 20));
        jtxfName.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jtxfNameActionPerformed(evt);
            }
        });
        jtxfName.addFocusListener(new java.awt.event.FocusAdapter() {
            public void focusLost(java.awt.event.FocusEvent evt) {
                jtxfNameFocusLost(evt);
            }
        });
        add(jtxfName);
        jtxfName.setBounds(40, 0, 300, 20);
    }
    private void jtxfNameActionPerformed(java.awt.event.ActionEvent evt) {
        // Add your handling code here:
    }
    private void jtxfNameFocusLost(java.awt.event.FocusEvent evt) {
        // Add your handling code here:
        if(!evt.isTemporary())
            setStrTextCaption(jtxfName.getText());
    }
    private void DerivedLabelTextComponentListener(java.awt.event.ComponentEvent evt) {
        // Add your handling code here:
        //jtxfName.setBounds(jlblName.getX()+jlblName.getWidth(),jlblName.getY(),getWidth()-jlblName.getX()-jlblName.getWidth()-50,jtxfName.getHeight());
        resizecontrols();
    }
    /** Getter for property strLabelCaption.
     * @return Value of property strLabelCaption.
     */
    public java.lang.String getStrLabelCaption() {
        return strLabelCaption;
    }    
    
    /** Setter for property strLabelCaption.
     * @param strLabelCaption New value of property strLabelCaption.
     */
    public void setStrLabelCaption(java.lang.String strLabelCaption) {
        this.strLabelCaption = strLabelCaption;
    }    
    
    /** Getter for property strTextCaption.
     * @return Value of property strTextCaption.
     */
    public java.lang.String getStrTextCaption() {
        return strTextCaption;
    }
    
    /** Setter for property strTextCaption.
     * @param strTextCaption New value of property strTextCaption.
     */
    public void setStrTextCaption(java.lang.String strTextCaption) {
        this.strTextCaption = strTextCaption;
    }
    
    /** Getter for property intLabelWidth.
     * @return Value of property intLabelWidth.
     */
    public int getIntLabelWidth() {
        return intLabelWidth;
    }
    
    /** Setter for property intLabelWidth.
     * @param intLabelWidth New value of property intLabelWidth.
     */
    public void setIntLabelWidth(int intLabelWidth) {
        this.intLabelWidth = intLabelWidth;
        resizecontrols();
        //DerivedLabelTextComponentListener(new java.awt.event.ComponentEvent());
    }
    
    private void constructor()
    {
        initComponents();
    }
    
    private void constructor(java.lang.String mstrLabelCaption,java.lang.String mstrTextCaption)
    {
        setStrTextCaption(mstrTextCaption);
        constructor(mstrLabelCaption);
    }
    
    private void constructor(java.lang.String mstrLabelCaption,java.lang.String mstrTextCaption,int mintLabelWidth)
    {
        constructor(mstrLabelCaption,mstrTextCaption);
        setIntLabelWidth(mintLabelWidth);
    }
    
    private void constructor(java.lang.String mstrLabelCaption)
    {
        setStrLabelCaption(mstrLabelCaption);
        constructor();
    }
    
    private void resizecontrols()
    {
        jtxfName.setBounds(jlblName.getX()+jlblName.getWidth(),jlblName.getY(),getWidth()-jlblName.getX()-jlblName.getWidth()-1,jtxfName.getHeight());
    }
    // Variables declaration - do not modify
    private javax.swing.JLabel jlblName;
    private javax.swing.JTextField jtxfName;
    // End of variables declaration
    
    private java.lang.String strLabelCaption;
    private java.lang.String strTextCaption;
    private int intLabelWidth;
}

DerivedNames.java

  
/*
 * DerivedNames.java
 *
 * Created on April 13, 2004, 8:19 AM
 */
package BeanPract.PRACTICE;
/**
 *
 * @author  SpShah
 */
public class DerivedNames extends javax.swing.JPanel {
    
    /** Creates new form DerivedNames */
    public DerivedNames() {
        //initComponents();
        setLayout(new java.awt.GridLayout(0,1));
        ctlName=new DerivedLabelText("Name");
        ctlName.addFocusListener(new java.awt.event.FocusAdapter(){
            public void focusLost(java.awt.event.FocusEvent e)
            {
                if(!e.isTemporary())
                    getObjName().setStrName(ctlName.getStrTextCaption());
            }
        });
        add(ctlName);
        ctlShortName=new DerivedLabelText("Short Name");
        ctlShortName.addFocusListener(new java.awt.event.FocusAdapter(){
            public void focusLost(java.awt.event.FocusEvent e)
            {
                if(!e.isTemporary())
                    getObjName().setStrShortName(ctlShortName.getStrTextCaption());
            }
        });
        add(ctlShortName);
        setObjName(new DerivedNamesObject());
        setBackground(java.awt.Color.blue);
        addComponentListener(new java.awt.event.ComponentAdapter(){
            public void componentResized(java.awt.event.ComponentEvent e)
            {
/*                a.setBounds(0,0, getContentPane().getWidth()-10,getContentPane().getHeight()-10);
                a.repaint();*/
/*                repaint();
                new javax.swing.JOptionPane().showMessageDialog(null, "alert", "alert", javax.swing.JOptionPane.ERROR_MESSAGE);*/
                setPreferredSize(new java.awt.Dimension(getSize()));
            }
        }); 
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {
        setLayout(new java.awt.GridLayout(1, 0));
    }
    /** Getter for property objName.
     * @return Value of property objName.
     */
    public BeanPract.PRACTICE.DerivedNamesObject getObjName() {
        return objName;
    }    
    
    /** Setter for property objName.
     * @param objName New value of property objName.
     */
    public void setObjName(BeanPract.PRACTICE.DerivedNamesObject objName) {
        this.objName = objName;
        ctlName.setStrTextCaption(objName.getStrName());
        ctlShortName.setStrTextCaption(objName.getStrShortName());
    }
    
    // Variables declaration - do not modify
    // End of variables declaration
    private DerivedNamesObject objName;
    private DerivedLabelText ctlName;
    private DerivedLabelText ctlShortName;
}

Test.java

  
/*
 * Test.java
 *
 * Created on April 14, 2004, 10:46 AM
 */
package BeanPract.PRACTICE;
/**
 *
 * @author  SpShah
 */
public class Test extends javax.swing.JFrame {
    
    /** Creates new form Test */
    public Test() {
/*       getContentPane().setLayout(new java.awt.GridLayout(0,1));
        a= new DerivedLabelText();
        getContentPane().add(a);
        a.setSize(500,500);
        b= new DerivedLabelText();
        getContentPane().add(b);
        setSize(400,400);
        //initComponents();*/
        setSize(500,500);
        getContentPane().setLayout(null);
        a=new DerivedNames();
        a.setBounds(0,0,getWidth(),getHeight());
        getContentPane().add(a);
        addComponentListener(new java.awt.event.ComponentAdapter(){
            public void componentResized(java.awt.event.ComponentEvent e)
            {
                a.setBounds(0,0, getContentPane().getWidth()-10,getContentPane().getHeight()-10);
                /*a.repaint();
                repaint();*/
                //new javax.swing.JOptionPane().showMessageDialog(null, "alert", "alert", javax.swing.JOptionPane.ERROR_MESSAGE);
            }
        });
        setBackground(java.awt.Color.black);
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {
        getContentPane().setLayout(new java.awt.GridLayout());
        setTitle("This is a Test Demo");
        addComponentListener(new java.awt.event.ComponentAdapter() {
            public void componentResized(java.awt.event.ComponentEvent evt) {
                TestComponentResized(evt);
            }
        });
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
            }
        });
        pack();
    }
    private void TestComponentResized(java.awt.event.ComponentEvent evt) {
        // Add your handling code here:
        //a.setBounds(a.getX(),a.getY(),getWidth(),a.getHeight());
    }
    
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        new Test().show();
    }
    
    
    // Variables declaration - do not modify
    // End of variables declaration
/*    private DerivedLabelText a;
    private DerivedLabelText b;*/
    private DerivedNames a;
}

I think i have to change the preferred size of the controls and then use pack() method
Is it true But Where should i write this code
I can't find a answer to this question
please help me regarding this
Thanks in advance
Chirag

[Chirag Jakharia]

I got myself right by adding a ComponentListener which will fire componentResized event
In this event we will call updateUI() method Which will update the panel according to its Layout
My problem was that despite the size of the panel changes the controls do not change their size according to layout
Now the improved code for DerivedNames is

  
/*
 * DerivedNames.java
 *
 * Created on April 13, 2004, 8:19 AM
 */
package BeanPract.PRACTICE;
/**
 *
 * @author  SpShah
 */
public class DerivedNames extends javax.swing.JPanel {
    
    /** Creates new form DerivedNames */
    public DerivedNames() {
        //initComponents();
        setLayout(new java.awt.GridLayout(0,1));
        ctlName=new DerivedLabelText("Name");
        ctlName.addFocusListener(new java.awt.event.FocusAdapter(){
            public void focusLost(java.awt.event.FocusEvent e)
            {
                if(!e.isTemporary())
                    getObjName().setStrName(ctlName.getStrTextCaption());
            }
        });
        add(ctlName);
        ctlShortName=new DerivedLabelText("Short Name");
        ctlShortName.addFocusListener(new java.awt.event.FocusAdapter(){
            public void focusLost(java.awt.event.FocusEvent e)
            {
                if(!e.isTemporary())
                    getObjName().setStrShortName(ctlShortName.getStrTextCaption());
            }
        });
        add(ctlShortName);
        setObjName(new DerivedNamesObject());
        setBackground(java.awt.Color.blue);
        addComponentListener(new java.awt.event.ComponentAdapter(){
            public void componentResized(java.awt.event.ComponentEvent e)
            {
/*                a.setBounds(0,0, getContentPane().getWidth()-10,getContentPane().getHeight()-10);
                a.repaint();*/
/*                repaint();
                new javax.swing.JOptionPane().showMessageDialog(null, "alert", "alert", javax.swing.JOptionPane.ERROR_MESSAGE);*/
                //setPreferredSize(new java.awt.Dimension(getSize()));
                updateui();
            }
        }); 
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {
        setLayout(new java.awt.GridLayout(1, 0));
    }
    /** Getter for property objName.
     * @return Value of property objName.
     */
    public BeanPract.PRACTICE.DerivedNamesObject getObjName() {
        return objName;
    }    
    
    /** Setter for property objName.
     * @param objName New value of property objName.
     */
    public void setObjName(BeanPract.PRACTICE.DerivedNamesObject objName) {
        this.objName = objName;
        ctlName.setStrTextCaption(objName.getStrName());
        ctlShortName.setStrTextCaption(objName.getStrShortName());
    }
    
    // Variables declaration - do not modify
    // End of variables declaration
    private DerivedNamesObject objName;
    private DerivedLabelText ctlName;
    private DerivedLabelText ctlShortName;
}