Name: rmT116609 Date: 04/25/2001


java version "1.3.0_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0_01)
Java HotSpot(TM) Client VM (build 1.3.0_01, mixed mode)

I am using JTextPane to allow user to type char or add JButton inside.

The problem is I always get the wrong number of components in a JTextPane:

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.border.*;
import java.awt.event.*;
import java.util.*;

//*********************************************************************
//
// demo application
//
//*********************************************************************

public class JTextPaneBugDemo extends javax.swing.JFrame implements ActionListener, KeyListener
{
final int cWidth = 488;
final int cHeigh = 350;
final int cInset = 15;
final int cFaqHeigh = cHeigh - 80;
final int cFaqWidth = cWidth - 100;


JTextPane mTxtFaq = new JTextPane();

public JTextPaneBugDemo()
{
setTitle("JFC Application");
getContentPane().setLayout (new FlowLayout (FlowLayout.LEFT));
setSize(cWidth,cHeigh);
setVisible(true);

getContentPane().add(getFaqPanel());

}


private void loadData()
{
        JOptionPane.showMessageDialog(this, "You will get exceptions after this message if you are running version 1.3.0 or 1.3.0_01.", "JTextPane Bugs", JOptionPane.WARNING_MESSAGE);

Document doc = mTxtFaq.getDocument();

mTxtFaq.setText("");

for (int i =0; i < 20; i++)
{
try
{
int nEndPos = doc.getEndPosition().getOffset()-1;
if (i == 0)
{
doc.insertString(nEndPos, "For version 1.3.0 and 1.3.0_01, the component can't be inserted correctly. In the case that components can be inserted properly, the vertical scrollbar doesn't show in version 1.3.0 or 1.3.0_01. So where is the problem ???", null);
}
else
{
doc.insertString(nEndPos, "Line " + i + "**********************", null);
}

}
catch (Exception ex) {} // bad position

if (i < 5)
{
JButton button = new JButton("JButton");
                insertButton(mTxtFaq,button);
            }
}

}


private JPanel getFaqPanel()
{
JPanel faqPanel = new JPanel();

        Dimension d = new Dimension(cWidth - cInset * 3,cFaqHeigh);
        faqPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
        faqPanel.setPreferredSize(d);
        faqPanel.setBorder( new CompoundBorder(new TitledBorder(new EtchedBorder(),"Faq:"),
        new EmptyBorder(0,0,0,0)));
        
                
        // Faq text area
JScrollPane faqPane = new JScrollPane(mTxtFaq);
faqPane.setPreferredSize(new Dimension(cFaqWidth,160));

mTxtFaq.addKeyListener(this);
try
{
mTxtFaq.getDocument().insertString(0, "After you type in and add several JButtons inside this JtextPane, select one of these JButton and press delete button.", null);
}
catch (Exception ex) {}

faqPanel.add(faqPane);


        faqPanel.add(getButtonsPanel());
                
        return faqPanel;
}



protected JPanel getButtonsPanel()
{
JButton addButton = new JButton("Add JButton");
        addButton.addActionListener(this);
        
JButton clearButton = new JButton("Clear JTextPane");
        clearButton.addActionListener(this);
        
        JButton loadButton =new JButton("Load Data");
        loadButton.addActionListener(this);
        
        JPanel btnPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
        Dimension d5 = new Dimension(cFaqWidth-50,40);
        btnPanel.setPreferredSize(d5);
        btnPanel.add(addButton);
        btnPanel.add(clearButton);
        btnPanel.add(loadButton);
        return btnPanel;
}


public void actionPerformed(ActionEvent e)
    {
        if (e.getActionCommand().trim().equals("Add JButton"))
        {
            JButton button = new JButton(" JButton ");
            insertButton(mTxtFaq,button);
        }
        else if (e.getActionCommand().trim().equals("Clear JTextPane"))
        {
            mTxtFaq.setText("");
        }
        else
        {
            loadData();
        }
    }
    
    private void insertButton(JTextPane txtPane, JButton button)
    {
        button.setBackground(Color.white);
        button.setBorder(new EmptyBorder(0,0,0,0));
        button.setForeground(Color.blue);
        button.setAlignmentY(0.8f);
        button.addKeyListener(this);
        txtPane.insertComponent(button);
    }
    
public void keyTyped(KeyEvent e)
{
// nothing
}

public void keyPressed(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_DELETE )
        {
            deleteButtonFrom(mTxtFaq,e);
        }
}

private void deleteButtonFrom(JTextPane txtPane, KeyEvent e)
{
        int nCount = txtPane.getComponentCount();
        for (int i = 0; i < nCount; i++)
        {
            JOptionPane.showMessageDialog(this, "There are " + nCount + " JButtons in this JTextPane. The number showing here is probably wrong if you are running 1.3.0 or 1.3.0_01.\n You will get an exception after this message if you are running version 1.3.0 or 1.3.0_01.", "JTextPane Bugs", JOptionPane.WARNING_MESSAGE);
            Component b1 = e.getComponent();
            Component b2 = txtPane.getComponent(i+1);
            
            // Why I can't use remove method to remove a component from JTextPane ????
            // txtPane.remove(b2);
            // txtPane.repaint();
            // return;
                
            Component b3 = ((Container)b2).getComponent(0);
            if (b1.equals(b3))
            {
                int nStart = txtPane.viewToModel(new Point(b2.getX(),b2.getY()));
                txtPane.select(nStart, nStart + 1);
                
                txtPane.replaceSelection(null);
                return;
            }
        }
}

public void keyReleased(KeyEvent e)
{
        // nothing
}


static public void main(String args[])
{
try {
(new JTextPaneBugDemo()).setVisible(true);
}
catch (Throwable t) {
t.printStackTrace();
System.exit(0);
}
}

}

With 1.2.2, the application is working fine and showing the correct number of
components in JTextPane, but when deleting the very first component from
the JTextPane , it throws the following exception.

Exception occurred during event dispatching:
java.lang.ArrayIndexOutOfBoundsException: No such child: 4
        at java.awt.Container.getComponent(Container.java, Compiled Code)
        at JTextPaneBugDemo.deleteButtonFrom(JTextPaneBugDemo.java, Compiled Code)
        at JTextPaneBugDemo.keyPressed(JTextPaneBugDemo.java:161)
        at java.awt.Component.processKeyEvent(Component.java:3127)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:1582)
        at java.awt.Component.processEvent(Component.java, Compiled Code)
        at java.awt.Container.processEvent(Container.java, Compiled Code)
        at java.awt.Component.dispatchEventImpl(Component.java, Compiled Code)
        at java.awt.Container.dispatchEventImpl(Container.java, Compiled Code)
        at java.awt.Component.dispatchEvent(Component.java, Compiled Code)
        at java.awt.LightweightDispatcher.processKeyEvent(Container.java:1791)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java, Compiled Code)
        at java.awt.Container.dispatchEventImpl(Container.java, Compiled Code)
        at java.awt.Window.dispatchEventImpl(Window.java, Compiled Code)
        at java.awt.Component.dispatchEvent(Component.java, Compiled Code)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java, Compiled Code)
        at java.awt.EventDispatchThread.pumpOneEventForComponent(EventDispatchThread.java, CompiledCode)
        at java.awt.EventDispatchThread.pumpEventsForComponent(EventDispatchThread.java:95)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:90)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
(Review ID: 114601)
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