// KeyboardApplicationAnonAdapter.java applet for ICS21/80J

// By N. Jacobson 11/02 to demonstrate event handling via a full GUI stand-alone interface

// Display a rectangle in a panel by providing its upper-left x,y coordinates

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


public class KeyboardApplicationAnonAdapter
{
	public static void main(String[] args)
	{
		// Make a rectangle frame that
		// ...closes on exit
		// Then display the pane
		JFrame appFrame = new RectangleFrame();
		appFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		appFrame.setVisible(true);
	}

}

class RectangleFrame extends JFrame
{
	private RectanglePanel rectPanel;
	private ControlPanel controlPanel;

	// Make new rectangle panel (user-defined object)
	// Get the current control pane and add the rectangle pane to it
	// Make a new control panel (user-defined object)
	// Get the current control pane and add the control pane to it
	// Fit the control pane to the frame
	public RectangleFrame()
	{
		rectPanel = new RectanglePanel();
		getContentPane().add(rectPanel, BorderLayout.CENTER);
		controlPanel = new ControlPanel(rectPanel);
		getContentPane().add(controlPanel, BorderLayout.SOUTH);
		pack();
	}
}


class RectanglePanel extends JPanel
{
	private Rectangle box;

	// Set the screen to 300 X 300 pixels
	// Make the rectangle
	public RectanglePanel()
	{
		setPreferredSize(new Dimension(300,300));
		box = new Rectangle(100,100,20,30);
	}

	// Move the rectabgle and froce the
	// screen to repaint, so we see the
	// rectangle i the new position
	public void setLocation(int x, int y)
	{
		box.setLocation(x,y);
		repaint();
	}
	
	// Redraw the rectangle
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);		
		Graphics2D g2 = (Graphics2D)g;
		g2.draw(box);
	}
}

class ControlPanel extends JPanel
{
	public ControlPanel(final RectanglePanel rectPanel)
	{
		// vars used in inner classes in another method
		// must be 'final'
		final JTextField xField = new JTextField(5);
		final JTextField yField = new JTextField(5);

		JButton moveButton = new JButton("Move");

		// When 'move' button pressed, update
		// rectangle's location and redisplay;
		// done via used of anonymous inner class
		moveButton.addActionListener(
			new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					int x = Integer.parseInt(xField.getText());
					int y = Integer.parseInt(yField.getText());
					rectPanel.setLocation(x,y);
				}
			});

		// Define labels
		JLabel xLabel = new JLabel("x = ");
		JLabel yLabel = new JLabel("y = ");

		// Place components into panel
		add(xLabel);
		add(xField);
		add(yLabel);
		add(yField);
		add(moveButton);
	}
}