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Thread: jpanel and using the timer class

  1. #1
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    Default jpanel and using the timer class

    hi all, im making a school management system using netbeans java desktop application
    just need help displaying moving text on a jpanel at the bottom of my mainform. i used a timer class bt doesnt work.
    i also have another jpanel that displays the current user and current time and date which also uses a timer class and an actionperformed method to update the time every 1 second.
    my code is as follows


     
    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
     
    /*
     * MainForm.java
     *
     * Created on Mar 19, 2011, 8:48:29 PM
     */
     
    package sms;
     
    import java.awt.event.ActionListener;
    import java.util.Locale;
    import javax.swing.Timer;
    //import sms.MainForm.MovMsgJPanel.TimerListener;
     
    /**
     *
     * @author makswizzy
     */
    public class MainForm extends javax.swing.JFrame implements ActionListener {
     
     [B][COLOR="blue"]//CODE FOR THE JPANEL TO DISPLAY THE MOVING MESSAGE[/COLOR][/B]
     
        private static class MovMsgJPanel extends javax.swing.JPanel {
            private String message = "Welcome to java";
            private int xCoordinate = 0;
            private int yCoordinate = 20;
     
            public MovMsgJPanel() {
     
                Timer timer = new Timer(1000, new TimerListener());
     
                timer.start();
            }
     
            //paint message
            @Override
            public void paintComponent(java.awt.Graphics g){
                super.paintComponent(g);
                if(xCoordinate >getWidth()){
                    xCoordinate = -20;
                }
                xCoordinate +=5;
                g.drawString("message moving", xCoordinate, yCoordinate);
     
            }
     
            class TimerListener implements ActionListener{
                //handle ActionEvent
               public void actionPerformed(java.awt.event.ActionEvent e){
                   repaint();
                }
            }
        }
     
         private java.sql.Connection dbconn = null;
     
    [B][COLOR="blue"]TIMER CLASS TO UPDATE THE TIME[/COLOR][/B]
     
         Timer timer = new Timer(1000, (ActionListener) this);
     
     
     
        /** Creates new form MainForm */
     
        public MainForm(java.sql.Connection databaseConnection) {
            dbconn = databaseConnection;
            initComponents();
     
           this.add(new MovMsgJPanel());
     
            CurrentUserLbl.setText("Current user" + " "+System.getProperty("active user"));//setting the current user as the logged in user
     
     
     
              timer.start();
     
     
        }
     
     
     
     
     
     
     
     
        public void actionPerformed(java.awt.event.ActionEvent e){
            java.util.Calendar calendar = new java.util.GregorianCalendar();//creating a calender object and setting it to the gregorian calendar
            java.text.DateFormat formatter = java.text.DateFormat.getDateTimeInstance(java.text.DateFormat.FULL, java.text.DateFormat.MEDIUM,Locale.getDefault());///formatting the date and time
            java.util.TimeZone timezone = java.util.TimeZone.getDefault();//getting the default time zone as per the system time zone and assigning it to the variable timezone
            formatter.setTimeZone(timezone);//setting the time zone to the format and can also be done as below
            //formatter.setTimeZone(java.util.TimeZone.getDefault());
     
            CurrentTimeLbl.setText(formatter.format(calendar.getTime()));
     
     
     
        }
     
     
     
     
     
     
     
     
     
     
     
        /** 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.
         */
        @SuppressWarnings("unchecked")
        // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
        private void initComponents() {
            java.awt.GridBagConstraints gridBagConstraints;
     
            TaskBarJPanel = new javax.swing.JPanel();
            CurrentUserLbl = new javax.swing.JLabel();
            CurrentTimeLbl = new javax.swing.JLabel();
            MainDesktopPane = new javax.swing.JDesktopPane();
            MovMsgJPanel = new javax.swing.JPanel();
            MenuBar = new javax.swing.JMenuBar();
            jMenu1 = new javax.swing.JMenu();
            jMenu2 = new javax.swing.JMenu();
     
            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
            org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance().getContext().getResourceMap(MainForm.class);
            setTitle(resourceMap.getString("Form.title")); // NOI18N
            setName("Form"); // NOI18N
            getContentPane().setLayout(new java.awt.GridBagLayout());
     
            TaskBarJPanel.setName("TaskBarJPanel"); // NOI18N
            TaskBarJPanel.setLayout(new java.awt.GridBagLayout());
     
            CurrentUserLbl.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
            CurrentUserLbl.setText(resourceMap.getString("CurrentUserLbl.text")); // NOI18N
            CurrentUserLbl.setName("CurrentUserLbl"); // NOI18N
            gridBagConstraints = new java.awt.GridBagConstraints();
            gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
            gridBagConstraints.weightx = 1.0;
            TaskBarJPanel.add(CurrentUserLbl, gridBagConstraints);
     
            CurrentTimeLbl.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
            CurrentTimeLbl.setText(resourceMap.getString("CurrentTimeLbl.text")); // NOI18N
            CurrentTimeLbl.setName("CurrentTimeLbl"); // NOI18N
            gridBagConstraints = new java.awt.GridBagConstraints();
            gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
            gridBagConstraints.weightx = 1.0;
            TaskBarJPanel.add(CurrentTimeLbl, gridBagConstraints);
     
            gridBagConstraints = new java.awt.GridBagConstraints();
            gridBagConstraints.gridx = 0;
            gridBagConstraints.gridy = 3;
            gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
            gridBagConstraints.anchor = java.awt.GridBagConstraints.SOUTH;
            gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
            getContentPane().add(TaskBarJPanel, gridBagConstraints);
     
            MainDesktopPane.setBackground(resourceMap.getColor("MainDesktopPane.background")); // NOI18N
            MainDesktopPane.setName("MainDesktopPane"); // NOI18N
            gridBagConstraints = new java.awt.GridBagConstraints();
            gridBagConstraints.gridx = 0;
            gridBagConstraints.gridy = 0;
            gridBagConstraints.gridheight = 2;
            gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
            gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
            gridBagConstraints.weightx = 1.0;
            gridBagConstraints.weighty = 150.0;
            gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
            getContentPane().add(MainDesktopPane, gridBagConstraints);
     
            MovMsgJPanel.setName("MovMsgJPanel"); // NOI18N
            gridBagConstraints = new java.awt.GridBagConstraints();
            gridBagConstraints.gridx = 0;
            gridBagConstraints.gridy = 2;
            gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
            gridBagConstraints.anchor = java.awt.GridBagConstraints.SOUTH;
            gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
            getContentPane().add(MovMsgJPanel, gridBagConstraints);
     
            MenuBar.setName("MenuBar"); // NOI18N
     
            jMenu1.setText(resourceMap.getString("jMenu1.text")); // NOI18N
            jMenu1.setName("jMenu1"); // NOI18N
            MenuBar.add(jMenu1);
     
            jMenu2.setText(resourceMap.getString("jMenu2.text")); // NOI18N
            jMenu2.setName("jMenu2"); // NOI18N
            MenuBar.add(jMenu2);
     
            setJMenuBar(MenuBar);
     
            pack();
        }// </editor-fold>                        
     
        /**
        * @param args the command line arguments
        */
        /*
        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new MainForm().setVisible(true);
                }
            });
     
        }
         *
         */
     
     
        // Variables declaration - do not modify                     
        private javax.swing.JLabel CurrentTimeLbl;
        private javax.swing.JLabel CurrentUserLbl;
        private javax.swing.JDesktopPane MainDesktopPane;
        private javax.swing.JMenuBar MenuBar;
        private javax.swing.JPanel MovMsgJPanel;
        private javax.swing.JPanel TaskBarJPanel;
        private javax.swing.JMenu jMenu1;
        private javax.swing.JMenu jMenu2;
        // End of variables declaration                   
     
    }
    Last edited by copeg; March 31st, 2011 at 11:55 AM.


  2. #2
    Administrator copeg's Avatar
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    Default Re: jpanel and using the timer class

    For future posts, please flank your code with the code tags.

    What about this 'doesn't work'? Are there exceptions thrown? If it misbehaves, how? To demonstrate the problem, it helps to break it down to only the necessary portions of code and post an SSCCE

  3. #3
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    Default Re: jpanel and using the timer class

    there are no errors but no text is shown on the jpanel that is supposed to show a moving message. the code that doesnt work is:

     private static class MovMsgJPanel extends javax.swing.JPanel {
            private String message = "Welcome to java";
            private int xCoordinate = 0;
            private int yCoordinate = 20;
     
            public MovMsgJPanel() {
     
                Timer timer = new Timer(1000, new TimerListener());
     
                timer.start();
            }
     
            //paint message
            @Override
            public void paintComponent(java.awt.Graphics g){
                super.paintComponent(g);
                if(xCoordinate >getWidth()){
                    xCoordinate = -20;
                }
                xCoordinate +=5;
                g.drawString("message moving", xCoordinate, yCoordinate);
     
            }
     
            class TimerListener implements ActionListener{
                //handle ActionEvent
               public void actionPerformed(java.awt.event.ActionEvent e){
                   repaint();
                }
            }
        }

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