/*
 * JPanelDemo.java
 *
 * This program demonstrates using Panels to:
 * - Group Components into a single unit that can be
 *	 laid out together by a layout manager
 * - Protect a component from being stretched by a layout
 *	 manager.
 *
 * Copyright (c) 2000, 2004, 2011 - Russell C. Bjork
 *
 */

import java.awt.*;
import javax.swing.*;
 
public class JPanelDemo
{
	public static void main(String [] args)
	{
		// Create a window that uses a border layout to display six
		// buttons labelled NORTH, SOUTH, EAST, WEST, UP, and DOWN.
		// The four compass directions are placed in the corresponding
		// positions using a BorderLayout; the Up and Down buttons are
		// put into a single panel that is then placed in the center of
		// the BorderLayout.
		
		JFrame frame1 = new JFrame("Panel Demo 1");
		// Since BorderLayout is the default for a Frame, we don't need a setLayout()		
		frame1.getContentPane().add(new JButton("NORTH"), BorderLayout.NORTH);
		frame1.getContentPane().add(new JButton("SOUTH"), BorderLayout.SOUTH);
		frame1.getContentPane().add(new JButton("EAST"), BorderLayout.EAST);
		frame1.getContentPane().add(new JButton("WEST"), BorderLayout.WEST);
		JPanel centerPanel1 = new JPanel();
		centerPanel1.setLayout(new GridLayout(2, 1));
		centerPanel1.add(new JButton("UP"));
		centerPanel1.add(new JButton("DOWN"));
		frame1.getContentPane().add(centerPanel1, BorderLayout.CENTER);
		
		frame1.pack(); frame1.show();
		
		// Create a second window the same as the above, but using a
		// JPanel with a FlowLayout to protect each button from being
		// stretched to fill its space in the layout
		
		JFrame frame2 = new JFrame("Panel Demo 2");
		// Since BorderLayout is the default for a Frame, we don't need a setLayout()		
		frame2.getContentPane().add(protectedJButton("NORTH"), BorderLayout.NORTH);
		frame2.getContentPane().add(protectedJButton("SOUTH"), BorderLayout.SOUTH);
		frame2.getContentPane().add(protectedJButton("EAST"), BorderLayout.EAST);
		frame2.getContentPane().add(protectedJButton("WEST"), BorderLayout.WEST);
		JPanel centerPanel2 = new JPanel();
		centerPanel2.setLayout(new GridLayout(2, 1));
		centerPanel2.add(protectedJButton("UP"));
		centerPanel2.add(protectedJButton("DOWN"));
		frame2.getContentPane().add(centerPanel2, BorderLayout.CENTER);
		
		frame2.pack(); frame2.show();
	  }
	 
	// Create a protected button by wrapping it in a JPanel
	
	private static JPanel protectedJButton(String label)
	{
		JPanel panel = new JPanel();
		// Since FlowLayout is the default for a JPanel we don't need a setLayout()
		panel.add(new JButton(label));
		return panel;
	}
}