// MyPanel.java
//   -- continuing the example of EmptyFrame1.java

/**
 * Our main goal is to add panels to a frame.
 * In swing, panels are extensions of JPanels, and the main
 * method we need to override is the "paintComponent" method:
 *
 *	class MyPanel extends JPanel {
 *	  // override the paintComponent method
 *	  public void paintComponent(Graphics g) {
 *	    super.paintComponent(g);	// calls the default method first!
 *	    g.drawString("Hello Panel!", 75, 100); // our own renderings...
 *	  } //paintComponent
 *	} //class MyPanel
 *	
 * A JFrame has several layers, but the main one for
 * adding components is called "content pane".
 * We need to get this pane:
 *	Container contentPane = frame.getContentPane();
 * Then add various components to it.  In the present
 * example, we add a JPanel:
 *	contentPane.add( new MyPanel()); 
 **/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

// text panel

class textPanel extends JPanel {
  // override the paintComponent method
  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawString("Hello Panel!", 75, 100);
  } //paintComponent
} //class textPanel

class MyFrame extends JFrame {
  public MyFrame(String s) {
	// Frame Parameters
	setTitle(s);
	setSize(300,200); // default size is 0,0
	setLocation(10,200); // default is 0,0 (top left corner)

	// Window Listeners
	addWindowListener(new WindowAdapter() {
	  public void windowClosing(WindowEvent e) {
		dispose();
		System.exit(0);  // exit is still needed after dispose()!
	  } //windowClosing
	}); //addWindowLister

	// Add Panels
	Container contentPane = getContentPane();
	contentPane.add(new textPanel());
	contentPane.setBackground(Color.pink);
  } //constructor MyFrame
} //class MyFrame

public class MyPanel {
  public static void main(String[] args) {
    JFrame f = new MyFrame("My Hello Panel!");
    f.setVisible(true); // equivalent to f.show()!
  } //main
} //class MyPanel


/* NOTES:
	WindowAdapter() is class that implements WindowListers
	with null methods for all the 7 methods of WindowListeners!
	It is found in java.awt.event.*.
 */