//  WindowingDemoApplet.java  (c) 2007 Kari Laitinen

//  http://www.naturalprogramming.com

//  2007-02-04  File created.
//  2007-02-04  Latest modification.

//  This program demonstrates how a Java program can open additional
//  windows to the screen.

//  A JDialog-based dialog can be parented only by a another JDialog or
//  a JFrame-based window. This means that you cannot open a JDialog in
//  an applet. You can, however, use the static methods of class
//  JOptionPane to open dialogs in applets.

import java.awt.* ;
import java.awt.event.* ;
import javax.swing.* ;

class PasswordDialog extends JDialog
{
   JTextField     user_name_field  =  new JTextField( "" ) ;
   JPasswordField password_field   =  new JPasswordField( "" ) ;

   TextWindow  parent_window ;

   public PasswordDialog( JFrame  given_parent_window,
                          String  given_title )
   {
      super( given_parent_window, given_title ) ;

      parent_window  =  (TextWindow) given_parent_window ;

      setSize( 200, 130 ) ;

      getContentPane().setLayout( new GridLayout( 2, 2, 10, 10 ) ) ;

      add( new JLabel( "USER NAME:" ) ) ;
      add( user_name_field ) ;
      add( new JLabel( "PASSWORD:" ) ) ;
      add( password_field ) ;
   }
}



class TextWindow extends JFrame
                 implements ActionListener
{
   String  text_inside_this_window  =  "This is default text" ;

   PasswordDialog password_dialog  =  new PasswordDialog( this,
                                                "THIS IS PasswordDialog" ) ;

   JButton  change_password_button =  new JButton( "Change Password" ) ;

   public TextWindow( String given_window_title )
   {
      super( given_window_title ) ;

      change_password_button.addActionListener( this ) ;

      add( "South", change_password_button ) ;
   }

   public void change_text( String  given_new_text )
   {
      text_inside_this_window  =  given_new_text ;
      repaint() ;
   }

   public void actionPerformed( ActionEvent event )
   {
      if ( event.getSource() instanceof JButton )
      {
         if ( event.getSource()  ==  change_password_button )
         {
            password_dialog.setVisible( true ) ;
         }

         repaint() ;
      }
   }

   public void paint( Graphics graphics )
   {
      super.paint( graphics ) ;

      graphics.drawString( text_inside_this_window,
                           100, getHeight() / 2 ) ;

   }
}




public class WindowingDemoApplet extends    JApplet
                                 implements ActionListener
{
   JButton  open_window_button     =  new JButton( "Open Window" ) ;
   JButton  close_window_button    =  new JButton( "Close Window" ) ;
   JButton  change_text_button     =  new JButton( "Change Text " ) ;


   int  applet_width, applet_height ;

   int  ball_position_x, ball_position_y ;

   TextWindow  text_window  =  new  TextWindow( "THIS IS TextWindow" ) ;


   public void init()
   {
      text_window.setSize( 300, 200 ) ;

      setLayout( new BorderLayout() ) ;

      JPanel operations_panel  =  new  JPanel() ;

      open_window_button.addActionListener( this ) ;
      close_window_button.addActionListener( this ) ;
      change_text_button.addActionListener( this ) ;

      operations_panel.add( open_window_button ) ;
      operations_panel.add( close_window_button ) ;
      operations_panel.add( change_text_button ) ;

      add( "South", operations_panel ) ;


      //  Let's get the size of the applet (defined in .html file)

      applet_width   =  getSize().width ;
      applet_height  =  getSize().height ;

      ball_position_x  =  applet_width / 2  -  40 ;
      ball_position_y  =  applet_height / 2  -  40 ;

   }

   public void actionPerformed( ActionEvent event )
   {
      if ( event.getSource() instanceof JButton )
      {
         if ( event.getSource()  ==  open_window_button )
         {
            text_window.setVisible( true ) ;   // show the window
         }
         else if ( event.getSource()  ==  close_window_button )
         {
            text_window.setVisible( false ) ;  // hide the window
         }
         else if ( event.getSource()  ==  change_text_button )
         {
            String  given_text  =  JOptionPane.showInputDialog( this, 
                                        "Type new text for the TextWindow",
                                        "This is Input Dialog",
                                        JOptionPane.PLAIN_MESSAGE ) ;

            if ( given_text  !=  null )
            {
               text_window.change_text( given_text ) ;
            }

         }

         repaint() ;
      }
   }

}