//  MenuDemoWithPopupMenuSimple.java  (c) 2006 Kari Laitinen

//  http://www.naturalprogramming.com

//  2006-11-22  File created.
//  2006-11-22  Last modification.


//  This is a simplified version of program MenuDemoWithPopupMenu-
//  Application.java. This version does not provide a conventional
//  Settings menu, i.e., Settings can be changed only through the
//  pop-up menu. In MenuDemoWithPopupMenuApplication.java you can
//  modify the settings either through the conventional Settings menu
//  or through the pop-up Settings menu.

//  At least in a Windows PC, you have to use the RIGHT mouse button to
//  make the pop-up menu active.


import java.awt.* ;
import java.awt.event.*;

import javax.swing.* ;

class MenuDemoFrame extends JFrame implements ActionListener,
                                              MouseListener
{
   static final int WINDOW_WIDTH   =  500 ;
   static final int WINDOW_HEIGHT  =  400 ;

   JMenuItem  file_open_menu_item  =  new  JMenuItem( "Open" ) ;
   JMenuItem  file_save_menu_item  =  new  JMenuItem( "Save" ) ;
   JMenuItem  file_exit_menu_item  =  new  JMenuItem( "Exit" ) ;

   JMenuItem  edit_copy_menu_item  =  new  JMenuItem( "Copy" ) ;
   JMenuItem  edit_paste_menu_item =  new  JMenuItem( "Paste" ) ;

   JCheckBoxMenuItem  cyan_background_menu_item  =
                           new JCheckBoxMenuItem( "Cyan background" ) ;

   JRadioButtonMenuItem  small_text_menu_item  =
                                   new JRadioButtonMenuItem( "Small" ) ;
   JRadioButtonMenuItem  medium_text_menu_item  =
                                   new JRadioButtonMenuItem( "Medium" ) ;
   JRadioButtonMenuItem  large_text_menu_item  =
                                   new JRadioButtonMenuItem( "Large" ) ;

   JMenuItem  about_menu_item  =  new  JMenuItem( "About" ) ;

   String  last_selected_menu_item  =  "NO SELECTIONS MADE." ;

   JPopupMenu  settings_popup_menu  =  new  JPopupMenu() ;


   public MenuDemoFrame()
   {
      getContentPane().setBackground( Color.white ) ;

      setSize( WINDOW_WIDTH, WINDOW_HEIGHT ) ;

      setTitle( "GUI APPLICATION WITH MENUS" ) ;

      file_open_menu_item.setMnemonic( 'O' ) ;
      file_open_menu_item.addActionListener( this ) ;
      file_save_menu_item.setMnemonic( 'S' ) ;
      file_save_menu_item.addActionListener( this ) ;
      file_exit_menu_item.setMnemonic( 'x' ) ;
      file_exit_menu_item.addActionListener( this ) ;

      JMenu  file_menu  =  new  JMenu( "File" ) ;
      file_menu.setMnemonic( 'F' ) ;

      file_menu.add( file_open_menu_item ) ;
      file_menu.add( file_save_menu_item ) ;
      file_menu.add( file_exit_menu_item ) ;

      edit_copy_menu_item.addActionListener( this ) ;
      edit_paste_menu_item.addActionListener( this ) ;

      JMenu  edit_menu  =  new  JMenu( "Edit" ) ;

      edit_menu.add( edit_copy_menu_item ) ;
      edit_menu.add( edit_paste_menu_item ) ;

      // JMenu  settings_menu  =  new  JMenu( "Settings" ) ;

      cyan_background_menu_item.addActionListener( this ) ;

      // settings_menu.add( cyan_background_menu_item ) ;

      small_text_menu_item.addActionListener( this ) ;
      medium_text_menu_item.addActionListener( this ) ;
      large_text_menu_item.addActionListener( this ) ;

      medium_text_menu_item.setSelected( true ) ;

      ButtonGroup  text_size_button_group  =  new  ButtonGroup() ;

      text_size_button_group.add( small_text_menu_item ) ;
      text_size_button_group.add( medium_text_menu_item ) ;
      text_size_button_group.add( large_text_menu_item ) ;

      JMenu  text_size_menu  =  new  JMenu( "Text size" ) ;
      
      text_size_menu.add( small_text_menu_item ) ;
      text_size_menu.add( medium_text_menu_item ) ;
      text_size_menu.add( large_text_menu_item ) ;

      // settings_menu.add( text_size_menu ) ;

      JMenu  help_menu  =  new  JMenu( "Help" ) ;

      about_menu_item.addActionListener( this ) ;
      help_menu.add( about_menu_item ) ;

      JMenuBar menubar_of_this_window  =  new JMenuBar() ;

      menubar_of_this_window.add( file_menu ) ;
      menubar_of_this_window.add( edit_menu ) ;
      // menubar_of_this_window.add( settings_menu ) ;
      menubar_of_this_window.add( help_menu ) ;

      setJMenuBar( menubar_of_this_window ) ;

      setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ) ;

      //  Let's put the items of the settings menu also to the popup menu.

      settings_popup_menu.add( cyan_background_menu_item ) ;
      settings_popup_menu.add( text_size_menu ) ;

      addMouseListener(this);
   }


   //  This program implements the MouseListener interface.
   //  The pop-up menu must be shown when the mouse is pressed and
   //  released.


   public void mouseClicked( MouseEvent event ) {}
   public void mouseEntered( MouseEvent event ) {}
   public void mouseExited( MouseEvent event ) {}

   public void mousePressed( MouseEvent event )
   {
      if ( event.isPopupTrigger() )
      {
         settings_popup_menu.show( event.getComponent(), event.getX(),
                                                         event.getY() ) ;
      }
   }

   public void mouseReleased( MouseEvent event )
   {
      if ( event.isPopupTrigger() )
      {
         settings_popup_menu.show( event.getComponent(), event.getX(),
                                                         event.getY() ) ;
      }
   }

   //  NOTE:  The rest of this program is the same as the corresponding
   //         part of program MenuDemoApplication.java.


   //  The following method reacts to the menu selections.
   //  In most cases the only reaction is that the text that
   //  appears on the screen is changed.
   //  Background color is set to cyan if that selection is made.
   //  Help -> About selection brings a message dialog to the screen.
   //  File -> Exit selection terminates the application.

   public void actionPerformed( ActionEvent event )
   {
      if ( event.getSource() instanceof JMenuItem )
      {
         JMenuItem selected_menu_item  = (JMenuItem) event.getSource() ;

         last_selected_menu_item  =  selected_menu_item.getText() ;

         if ( cyan_background_menu_item.isSelected() == true )
         {
            getContentPane().setBackground( Color.cyan ) ;
         }
         else
         {
            getContentPane().setBackground( Color.white ) ;
         }

         if ( selected_menu_item  ==  file_exit_menu_item )
         {
            setVisible( false ) ;
            System.exit( 0 ) ;
         }
         else if ( selected_menu_item  ==  about_menu_item )
         {
            JOptionPane.showMessageDialog( this, 
                                 "This is a simple GUI application"
                               + "\nwith menus.",
                                 "About", JOptionPane.PLAIN_MESSAGE ) ;
         }

         repaint() ;
      }
   }


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

      if ( small_text_menu_item.isSelected() == true )
      {
         graphics.setFont( new Font( "Serif", Font.PLAIN, 10 ) ) ;
      }

      if ( medium_text_menu_item.isSelected() == true )
      {
         graphics.setFont( new Font( "Serif", Font.PLAIN, 14 ) ) ;
      }

      if ( large_text_menu_item.isSelected() == true )
      {
         graphics.setFont( new Font( "Serif", Font.PLAIN, 18 ) ) ;
      }

      graphics.drawString( "Last selected menu item: \""
                        +   last_selected_menu_item  +  "\"",
                           100, 200 ) ;
   }
}

public class MenuDemoWithPopupMenuSimple
{
   public static void main( String[] not_in_use )
   {
      MenuDemoFrame  this_application_window  =
                                     new  MenuDemoFrame() ;

      this_application_window.setVisible( true ) ;
   }
}