// File: MoreComplexExample.java
// Author: Rahul Simha
// Date created: August 14, 1998
// Modified: Sept 2007
//
// NOTE:
//   Illustrates advanced syntax/features of Java
//   Not commented

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

public class MoreComplexExample
  extends Frame 
  implements ActionListener {

  // Store current location of mouse
  int currentX=0, currentY=0;

  // Peculiarities of the Java GUI model -- listener objects
  public void createListeners ()
  {
    this.addMouseListener (
      new MouseAdapter ()
      {
	public void mousePressed (MouseEvent m)
	  {
	    System.out.println ("mousePressed event: " + m.paramString());
	    int x = m.getX();
	    int y = m.getY();
	    Graphics g = MoreComplexExample.this.getGraphics();
	    g.drawLine (currentX, currentY, x, y);
	    currentX = x;
	    currentY = y;
	  }
      }
    );

    this.addMouseMotionListener (
      new MouseMotionAdapter ()
      {
	public void mouseDragged (MouseEvent m)
	  {
	    System.out.println ("mouseDragged event: " + m.paramString());
	    int x = m.getX();
	    int y = m.getY();
	    Graphics g = MoreComplexExample.this.getGraphics();
	    g.drawLine (currentX, currentY, x, y);
	    currentX = x;
	    currentY = y;
	  }
      }
    );

  }

  // Button-pressed events
  public void actionPerformed (ActionEvent a)
  {
    String eventDesc = a.getActionCommand();
    System.out.println ("Button event: " + eventDesc);
    Color c = Color.gray;
    if (eventDesc.equalsIgnoreCase ("quit")) 
      System.exit(0);
    else if (eventDesc.equalsIgnoreCase ("red")) 
      c = Color.red;
    else if (eventDesc.equalsIgnoreCase ("blue")) 
      c = Color.blue;
    else if (eventDesc.equalsIgnoreCase ("green")) 
      c = Color.green;
    this.setBackground (c);
    this.repaint();
  }

  // Test the code via a static function
  public static void test ()
  {
    MoreComplexExample f = new MoreComplexExample ();
    FlowLayout fl = new FlowLayout();
    f.setLayout (fl);

    Button qb = new Button ("Quit");
    qb.addActionListener (f);
    f.add (qb);

    Button rb = new Button ("Red");
    rb.addActionListener (f);
    f.add (rb);

    Button bb = new Button ("Blue");
    bb.addActionListener (f);
    f.add (bb);

    Button gb = new Button ("Green");
    gb.addActionListener (f);
    f.add (gb);

    f.createListeners ();
    f.setResizable (true);
    f.setSize (500,600);
    f.setVisible (true);

  }

  // To start execution, "main" is needed
  public static void main (String[] argv)
  {
    test ();
  }

}