// This class illustrates some objects that can be placed in the user interface
// and some interactions that can take place with them.  There is a TextArea
// object, a TextField object, a Button object, and a Menu object.  Actions
// that are handled are mouse clicks, menu selections, typing in the text area, 
// and button selections.  All actions are echoed in the TextArea.

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

public class Interact extends Applet implements MouseListener, ActionListener,
                                                ItemListener {

// Variables used by the Applet
     int last_x = 0;
     int last_y = 0;
     Button clear_button;
     Choice user_choices;
     TextArea echo_area;  
     TextField user_typing;

// Initializing the Frame
    public void init() {
        // Set the background color and listen for the mouse
        setBackground(Color.white);
        addMouseListener(this);
		
        // Create a button and add it to the Frame.
        clear_button = new Button("Clear");
        clear_button.setForeground(Color.black);
        clear_button.setBackground(Color.lightGray);
        add(clear_button);
        clear_button.addActionListener(this);

        // Create a menu of user choices and add it to the 
        // Frame.
        user_choices = new Choice();
        user_choices.addItem("North");
        user_choices.addItem("East");
        user_choices.addItem("South");
        user_choices.addItem("West");
        add(user_choices);
        user_choices.addItemListener(this);

        // Create a TextArea and a TextField and add them to
        // the Frame.
        echo_area = new TextArea(5, 40);
        echo_area.setEditable(false);
        add(echo_area);
        user_typing = new TextField(40);
        add(new Label("User input: "));
        add(user_typing);
        user_typing.addActionListener(this);
    }
    
    // Called when the user depresses the mouse button
    public void mousePressed (MouseEvent e)
    {
       echo_area.setText(echo_area.getText() + "Mouse Down at " + 
                         e.getX() + ", " + e.getY() + "\n");
       Graphics g = this.getGraphics();
       g.drawOval(e.getX(), e.getY(), 2, 2);  // echo that point in the Frame
       last_x = e.getX();
       last_y = e.getY();
    }
    
    // Called when the user releases the mouse button
    public void mouseReleased (MouseEvent e)
    {
       echo_area.setText(echo_area.getText() + "Mouse Up at " + 
                         e.getX() + ", " + e.getY() + "\n");
    }

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

    // Called when the user selects a Button or TextArea
    public void actionPerformed (ActionEvent e) {
        Graphics g = this.getGraphics();

        // If the Clear button was clicked, handle it.
        if (e.getSource() == clear_button) {
            Rectangle r = this.bounds();
            g.setColor(this.getBackground());
            g.fillRect(r.x, r.y, r.width, r.height);
            echo_area.setText(echo_area.getText() + 
                              "Clear button selected " + "\n");
        }
        // Otherwise if some text was typed, handle that
        else if (e.getSource() == user_typing) {
            String s = user_typing.getText();
            echo_area.setText(echo_area.getText() + 
                              "User Typing: " + s + "\n");
        }
    }
    
    // Called when the user makes a Choice selection
    public void itemStateChanged (ItemEvent e) {
        echo_area.setText(echo_area.getText() + 
                          "Choice selected: " + e.getItem() + "\n");
    }
    
}