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Description
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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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