/*  
 *  File:  PopUpFrame.java
 *
 *  This applet shows how to create and show a separate frame with
 *  control buttons.
 *  
 */

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

public class PopUpFrame extends Applet 
			implements ActionListener
{
  Color backcolor = Color.magenta;
  NewFrame myframe;
  Canvas justcolor;
  Button getframe;
  
  public void init() 
  { 
    setLayout(new BorderLayout());
    myframe = new NewFrame(this);    // see class definition below

    getframe = new Button("Get Control Frame");
    getframe.addActionListener(this);
    add(getframe, BorderLayout.SOUTH);

    justcolor = new Canvas();
    justcolor.setBackground(backcolor);
    add(justcolor, BorderLayout.CENTER);
  }
  
  // this class is the listener for the button in the applet as
  // well as the three buttons on the separate frame.

  public void actionPerformed(ActionEvent evt) 
  {
    if (evt.getSource() == getframe)
      { myframe.setVisible(true); } // shows the frame

    else if (evt.getActionCommand().equals ("Quit"))
      { myframe.setVisible(false);  // hides the frame
        justcolor.setBackground (backcolor); }

    else if (evt.getActionCommand().equals ("Change to Blue"))
      { justcolor.setBackground (Color.blue); }

    else if (evt.getActionCommand().equals ("Change to Cyan"))
      { justcolor.setBackground (Color.cyan); }
  }
}

class NewFrame extends Frame 
{
  Button closewindow = new Button("Quit");
  Button bluebutton = new Button("Change to Blue");
  Button cyanbutton = new Button("Change to Cyan");
  
  // many Java programmers call the pointer to the calling class
  // the "outerparent" - here it is the "caller"

  NewFrame(ActionListener caller) 
  { 
    setTitle("Change Color");
    setSize(300,300);
    setLayout(new GridLayout(3,1,2,2));

    bluebutton.addActionListener(caller);
    add(bluebutton);
    cyanbutton.addActionListener(caller);
    add(cyanbutton);
    closewindow.addActionListener(caller);
    add(closewindow);

    // all components can generate WindowEvents
    addWindowListener (new CloseWindow());
  }
}

// responds to an event generated by the close window button

class CloseWindow extends WindowAdapter
{
  public void windowClosing (WindowEvent e)
  {
    e.getWindow().setVisible (false);
  }
}