Other components appear on updating imagePanel

Question

Hi,
I have a problem probably with repaining issues. i have a JApplet which contains
An ImagePanel (extends JPanel implements Runnable)
A JTextArea
A JTextField
A JButton.
In my imagePanel's run method there is a repaint() process in order to update the image. Everything runs OK at the first sight, but when I click the button or update the caret position on the textField and/or the textArea, the component which is the event source appears on the imagePanel's (0,0) point for a tiny time.
I've searched common problems on swing painting ( http://java.sun.com/docs/books/tutorial/uiswing/14painting/problems.html ) but couldn't find a solution. Thanks for your help.
ANIL

Answer 1

Class2: VideoInform
package com.zzz.media;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractAction;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
public class VideoInform extends JApplet implements ActionListener{
    private static final long serialVersionUID = 3192341190927364167L;
    // GUI
    private Font f = null;
    private JPanel pane = null;
    private VideoPanel vp = null;
    private JScrollPane chatScroll = null;
    private JTextArea chatArea = null;
    private JTextField chatMsg = null;
    private JButton sendMsg = null;
    public VideoInform(){
        super();
    public void init(){
        this.setSize(760, 270);
        this.f = new Font("DialogInput",Font.PLAIN,12);
        this.setContentPane(getPane());
    public void start(){}
    public void stop(){}
    public void destroy(){}
    private JPanel getPane(){
        if(pane == null){
            pane = new JPanel();
            pane.setBackground(new Color(255, 50, 120));
            pane.setLayout(null);
            pane.add(getVp(), null);
            pane.add(getChatScroll(), null);
            pane.add(getChatMsg(), null);
            pane.add(getSendMsg(), null);
        return pane;
    private JPanel getVp(){
        if(vp == null){
            vp = new VideoPanel();
            vp.setSize(320, 240);
            vp.setLocation(2, 2);
            vp.setBackground(Color.BLACK);
        return vp;
    private JScrollPane getChatScroll(){
        if(chatScroll == null){
            chatScroll = new JScrollPane();
            chatScroll.setBounds(new java.awt.Rectangle(324, 2, 434, 240));
            chatScroll.setHorizontalScrollBarPolicy(javax.swing.JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
            chatScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
            chatScroll.setBorder(javax.swing.BorderFactory.createLineBorder(java.awt.Color.magenta, 1));
            chatScroll.setViewportView(getChatArea());
        return chatScroll;
    private JTextArea getChatArea(){
        if(chatArea == null){
            chatArea = new JTextArea();
            chatArea.setLineWrap(true);
            chatArea.setFont(f.deriveFont(Font.BOLD, 11));
            chatArea.setMargin(new java.awt.Insets(0, 10, 0, 6));
            chatArea.setSelectionColor(java.awt.Color.black);
            chatArea.setSelectedTextColor(java.awt.Color.white);
            chatArea.setEditable(true);
        return chatArea;
    private JTextField getChatMsg(){
        if(chatMsg == null){
            chatMsg = new JTextField();
            chatMsg.setFont(f.deriveFont(Font.BOLD, 12));
            chatMsg.setText("jndskj jdnaskjndasknj kas kasdn");
            chatMsg.setBorder(javax.swing.BorderFactory.createLineBorder(java.awt.Color.gray, 1));
            chatMsg.setBounds(new java.awt.Rectangle(324, 244, 380, 22));
            chatMsg.getInputMap().put(KeyStroke.getKeyStroke("ENTER"), new AbstractAction(){
                private static final long serialVersionUID = -4311410938780211364L;
                public void actionPerformed(ActionEvent e){
                    sendMsg.doClick();
        return chatMsg;
    private JButton getSendMsg(){
        if(sendMsg == null){
            sendMsg = new JButton();
            sendMsg.setBounds(new java.awt.Rectangle(704, 244, 54, 22));
            sendMsg.setCursor(new Cursor(Cursor.HAND_CURSOR));
            sendMsg.setText("INFORM");
            sendMsg.setBorder(javax.swing.BorderFactory.createLineBorder(java.awt.Color.black, 1));
            sendMsg.setBackground(new java.awt.Color(255, 240, 255));
            sendMsg.setFont(f.deriveFont(Font.BOLD, 11));
        return sendMsg;
    public void actionPerformed(ActionEvent event){
        Object ori = event.getSource();
        if(ori == sendMsg){
            sendMsg.setEnabled(false);
            try{
                Thread.sleep(1000);
            } catch(InterruptedException e){
                e.printStackTrace();
            sendMsg.setEnabled(true);
}