// Java Scribble Applet: with event handling using nested, adapter, and disembodied classes
import java.io.*;
import java.awt.*;
import java.awt.event.*; 
import java.applet.*;
import javax.swing.*;

public class Scribble4 extends JApplet
{
  int last_x=0;
  int last_y=0;
  Color current_color=Color.black;
  JButton clear_button;
  JComboBox color_choices;

  public void init () 
  {
    Container c = getContentPane();
    c.setLayout(new FlowLayout());

    clear_button = new JButton("Clear");
    clear_button.setForeground(Color.black); 
    clear_button.setBackground(Color.gray); 
    c.add(clear_button);

    color_choices = new JComboBox();
    color_choices.addItem("black"); 
    color_choices.addItem("red"); 
    color_choices.addItem("yellow"); 
    color_choices.addItem("green");
    color_choices.addItem("blue");
    color_choices.addItem("cyan");
    color_choices.setForeground(Color.black); 
    color_choices.setBackground(Color.lightGray);
    c.add(new Label("Color:")); 
    c.add(color_choices);

    addMouseMotionListener
      (new MouseMotionAdapter ()
       {
	 public void mouseDragged(MouseEvent e)
	 {
	   int x = e.getX();
	   int y = e.getY();
	   Graphics g = getGraphics();
	   g.setColor(current_color);
	   g.drawLine(last_x,last_y, x,y);
	   last_x = x; 
	   last_y = y;
	 }
       }
       );
    addMouseListener(new MouseAdapter ()
		     {
		      public void mousePressed(MouseEvent e)
		      {
			last_x = e.getX(); last_y = e.getY();
		      }
		      }
		     );

    event_handler ev = new event_handler();
    clear_button.addActionListener(ev);
    color_choices.addActionListener(ev);

  }

  class event_handler implements ActionListener
  {
    // implements the ActionListener interface (the only method in 
    //      the ActionListener interface)
    public void actionPerformed (ActionEvent evt)
      {
	if (evt.getSource() == clear_button){
	  System.err.println("clear clicked...");
	  Container c = getContentPane();
	  Graphics g = c.getGraphics();
	  // Rectangle r = this.bounds();
	  g.setColor(c.getBackground());
	  int height = c.getInsets().right - c.getInsets().left;
	  int width = c.getInsets().bottom - c.getInsets().top;
	  System.err.println("height: " + c.getHeight() + " width: " + 
			     c.getWidth());
	  g.fillRect(0, 0, c.getHeight(), c.getWidth());

	}
	else if (evt.getSource() == color_choices){
	  String arg = (String)(((JComboBox)evt.getSource()).getSelectedItem());
	  if (arg.equals("black")) current_color = Color.black;
	  else if (arg.equals("red")) current_color = Color.red;
	  else if (arg.equals("yellow")) current_color = Color.yellow;
	  else if (arg.equals("green")) current_color = Color.green;
	  else if (arg.equals("blue")) current_color = Color.blue;
	  else if (arg.equals("cyan")) current_color = Color.cyan;
	}
      }
  }
  private void write_error (String x)
  {
    Graphics g = this.getGraphics();
    g.drawString(x, 100, 100);
  }

}