/**
 * A Simple stand-alone GUI program based on Swing.
 * The program displays all the command line args in a JFrame,
 * each arg becomes a JButton.
 * 
 * There are a number of methods defined in this program that
 * use various layout managers, one one should get called.
 * Try using different layout managers to see how they change 
 * the appearance of things...
 * (by default you will only see one button!)
 *
 * @author Dave Hollinger
 * @version 1.0
 */

import javax.swing.*;
import java.awt.*;       // needed for Container

class ListArgs {
  static private final String label = "Hello World";
  static private final String title = "Simple Java GUI";

  public static void main(String [] args) {
	// create a top-level container with a title
	JFrame frame = new JFrame(title);

	// set the size
	frame.setSize(400,200);

	// establish what happens when the window is closed
	// (without this the program would keep running!)
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	// grab the content container associated with the frame.
	Container c = frame.getContentPane();


	/* uncomment one of the lines below to establish which layout manager 
	   is used (these methods are defined below). 
	*/

	defaultLayout(c,args);   
	//flowLayout(c,args);	
	//gridLayout(c,args);
	//gridLayout2(c,args);


	// make the frame visible
	frame.setVisible(true);
  }

  /**
   * defaultLayout doesn't specify a layout manager.
   * (the default is BorderLayout).
   *
   * The result is that all the buttons are placed on top of each other
   * and you can only see the last one added
   * @param c is the container to which we add the buttons
   * @param args list of strings used to create buttons.
   */
  static void defaultLayout(Container c, String [] args) {
	// add each command line arg as a button
	for (int i=0;i<args.length;i++) {
	  c.add( new JButton(args[i]));
	  System.out.println("Adding " + args[i]);
	}
  }

  /**
   * flowLayout 
   * when adding each button the layout manager tries to get things to 
   * fit as best as possible
   * 
   * @param c is the container to which we add the buttons
   * @param args list of strings used to create buttons.
   */
  static void flowLayout(Container c, String [] args) {

	// set layout manager to FlowLayout, alignment is left,
	// with 5 pixels space between elements (horiz and vertical).
	c.setLayout(new FlowLayout(FlowLayout.LEFT,5,5));

	// add each command line arg as a button
	for (int i=0;i<args.length;i++) {
	  c.add( new JButton(args[i]));
	  System.out.println("Adding " + args[i]);
	}
  }


  /**
   * gridLayout created so that each button is in a row by itself
   * 
   * @param c is the container to which we add the buttons
   * @param args list of strings used to create buttons.
   */
  static void gridLayout(Container c, String [] args) {

	// use grid layout with enough rows and 5 pixels between elements.
	c.setLayout(new GridLayout(args.length,1,5,5));

	// add each command line arg as a button
	for (int i=0;i<args.length;i++) {
	  c.add( new JButton(args[i]));
	  System.out.println("Adding " + args[i]);
	}
  }

  /**
   * gridLayout2 created so that there are 2 buttons on each row
   * 
   * @param c is the container to which we add the buttons
   * @param args list of strings used to create buttons.
   */
  static void gridLayout2(Container c, String [] args) {

	// use grid layout with enough rows and 5 pixels between elements.
	c.setLayout(new GridLayout(args.length/2+1,2,5,5));

	// add each command line arg as a button
	for (int i=0;i<args.length;i++) {
	  c.add( new JButton(args[i]));
	  System.out.println("Adding " + args[i]);
	}
  }



}