/*  MenuTest.java
 *
 *  Bruce M. Bolden
 *  March 5, 1998
 */

import java.awt.*;
import java.awt.event.*;
import java.util.Random;

import corejava.*;


public class MenuTest extends CloseableFrame
    implements ActionListener
{
    protected Color textColor = Color.magenta;
   
    public static void main(String args[]) {
	    MenuTest f = new MenuTest();
		
	    InitializeMenu( f );
	    
	    f.setSize( 300, 300 );
	    f.show();
    }

	/**  Event handler
	 */
	public void actionPerformed( ActionEvent e )
	{
	    Color oldColor = textColor;
	    String cmd = e.getActionCommand();
	    
	    if( cmd.equals("clear") )        //  File menu
	        clear();
	    else if( cmd.equals("quit") )
	        System.exit(0);
	    else if( cmd.equals("undo") )    //  Edit menu
	        /* do nothing  */ ;
	    else if( cmd.equals("cut") )
	        /* do nothing  */ ;
	    else if( cmd.equals("copy") )
	        /* do nothing  */ ;
	    else if( cmd.equals("paste") )
	        /* do nothing  */ ;
	    else if( cmd.equals("red") )     //  Color menu
	        textColor = Color.red ;
	    else if( cmd.equals("green") )
	        textColor = Color.green ;
	    else if( cmd.equals("blue") )
	        textColor = Color.blue ;
	    
	    if( oldColor != textColor )
            repaint();   //  Note:  calls paint() indirectly!
	}
	
	/**  Clear the graphics context. 
	 */
	protected void clear()
	{
	    Graphics g = this.getGraphics();
	    g.setColor( this.getBackground() );
	    g.fillRect( 0, 0, this.getSize().width, this.getSize().height );
	}
	
	public void paint( Graphics g )
	{
	    Random r = new Random();
	    
	    for( int i = 0 ; i < 100 ; i++ )
	    {
	        int x = r.nextInt() % this.getSize().width;
	        int y = r.nextInt() % this.getSize().height;

	        g.setColor( textColor );
	        g.drawString( "Hello!", x, y );
	    }
	}
	
	/**  Initialize the menu
	 */
	protected static void InitializeMenu( MenuTest f )
	{
		MenuBar mBar = new MenuBar();
	    f.setMenuBar( mBar );
	    
	        //  Create/Add menus to Menu bar
	    Menu file  = new Menu( "File"  );
	    Menu edit  = new Menu( "Edit"  );
	    Menu color = new Menu( "Color" );
	    
	    mBar.add( file  );
	    mBar.add( edit  );
	    mBar.add( color );
	    
	        //  Create and add menu items to menus
	        
	        //  "File" menu
	    MenuItem clear = new MenuItem( "Clear", new MenuShortcut(KeyEvent.VK_C) );
	    clear.addActionListener(f);
	    clear.setActionCommand( "clear" );
	    file.add(clear);
	    
	    MenuItem quit = new MenuItem( "Quit", new MenuShortcut(KeyEvent.VK_Q) );
	    quit.addActionListener(f);
	    quit.setActionCommand( "quit" );
	    file.add(quit);
	    
	        //  "Edit" menu
	    /*
	    MenuItem undo = new MenuItem( "Undo", new MenuShortcut(KeyEvent.VK_Z) );
	    undo.addActionListener(f);
	    undo.setActionCommand( "undo" );
	    edit.add(undo);
	    
	    ....
	    
	    MenuItem paste = new MenuItem( "Paste", new MenuShortcut(KeyEvent.VK_V) );
	    paste.addActionListener(f);
	    paste.setActionCommand( "paste" );
	    edit.add(paste);
	    */
	    
	    createMenuItem( edit,  f, "Undo",  "undo",  KeyEvent.VK_Z );
	    createMenuItem( edit,  f, "Cut",   "cut",   KeyEvent.VK_X );
	    createMenuItem( edit,  f, "Copy",  "copy",  KeyEvent.VK_C );
	    createMenuItem( edit,  f, "Paste", "paste", KeyEvent.VK_V );
	    
	        //  "Color" menu
	    createMenuItem( color, f, "Red",   "red",   KeyEvent.VK_R );
	    createMenuItem( color, f, "Green", "green", KeyEvent.VK_G );
	    createMenuItem( color, f, "Blue",  "blue",  KeyEvent.VK_B );
	}
	
	/** A utility function for creating and adding menu items to a menu.
	 */
	protected static void createMenuItem( Menu m, ActionListener listener,
	    String label, String cmdString, int shortcut )
	{
	    MenuItem mi = new MenuItem( label, new MenuShortcut(shortcut) );
	    mi.addActionListener(listener);
	    mi.setActionCommand( cmdString );
	    m.add(mi);
	}
}