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

/**
 * Layout games part 2.
 * (part 1 is in file ConverterDemo1.java - BorderLayout)
 * BorderLayout
 * Default layout of Frame is BorderLayout.
 * BorderLayout has 5 'places':NORTH, SOUTH, EAST,WEST, CENTER
 * Our program has 7 components. A problem.
 * Solution: Panels
 *
 * Add some action -- ConverterDemo2.java
 */
public class ConverterDemo1a extends Frame {

	Button btnConvert, btnClear, btnExit;
	Label lblFrom, lblTo;
	TextField tfFrom, tfTo;

	ConverterDemo1a () {
		super("Unit Conversion Demo"); // call a parent constructor
						 // (must come first)
		btnConvert = new Button("Convert");
		btnClear = new Button("Clear");
		btnExit = new Button("Exit");
		lblFrom = new Label("FROM:", Label.CENTER);
		lblTo = new Label("TO:", Label.CENTER);
		tfFrom = new TextField(20);
		tfTo = new TextField(20);

		// Using the default BorderLayout for Frames
		// Panels (and therefore Applets) default to FlowLayout

		Panel pnlTop = new Panel();

		// change default layout
		pnlTop.setLayout(new GridLayout(0,2));

		// This time we keep the default
		Panel pnlBottom = new Panel();

		pnlTop.add(lblFrom);
		pnlTop.add(lblTo);

		pnlBottom.add(btnConvert);
		pnlBottom.add(btnClear);
		pnlBottom.add(btnExit);

		// peculiar results due to the policy of BorderLayout
		// unless you use pack() to let the layoutmanager choose
		// a useful frame size.

		add(pnlTop, BorderLayout.NORTH);
		add(pnlBottom, BorderLayout.SOUTH);

		add(tfFrom, BorderLayout.WEST);
		add(tfTo, BorderLayout.EAST);

		setBounds(400, 300, 300, 400);
		 pack();	// Window class. Lets layout manager choose
						// perferred size for Frame.
		setVisible(true);

		this.addWindowListener(new WindowAdapter () {
				public void windowClosing(WindowEvent wev) {
						dispose();
					}
				}
		);
	}

	public static void main(String [] args) {
		ConverterDemo1a cd1a = new ConverterDemo1a();
	}
}