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

/**
 * Layout games part 1.
 * (part 2 is in file ConverterDemo1a.java - BorderLayout)
 * GridLayouts and FlowLayouts
 * Effect of pack()
 * Default layout of Frame is BorderLayout.
 */
public class ConverterDemo1gridnp extends Frame {

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

	ConverterDemo1gridnp () {
		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:");
		lblTo = new Label("TO:");
		tfFrom = new TextField(20);
		tfTo = new TextField(20);

		//setLayout(new FlowLayout());
		setLayout(new GridLayout(0,2)); // 2 cols, any num rows

		add(lblFrom);
		add(lblTo);
		add(tfFrom);
		add(tfTo);
		add(btnConvert);
		add(btnClear);
		add(btnExit);

		/**
		 * Notice that the width and height args of setBounds() have
		 * no effect on flow layout. The same is true of
		 * with GridLayout if you use pack(); Without pack setSize()
		 * works with Frames.
		 */
		setBounds(400, 300, 300, 400);
		//pack();	// Window class. Sets window to preferred size.
		setVisible(true);

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

	public static void main(String [] args) {
		ConverterDemo1 cd1 = new ConverterDemo1();
	}
}