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

public class ScrollDemo extends JPanel {

    private Rule columnView;
    private Rule rowView;

    private JToggleButton isMetric;
    private ScrollablePicture picture;

    public ScrollDemo() {

	// Start loading the image icon now
	ImageIcon david = new ImageIcon("images/youngdad.jpeg");

	// Create the row and column headers
	columnView = new Rule(Rule.HORIZONTAL, true);
	columnView.setPreferredWidth(david.getIconWidth());
	rowView = new Rule(Rule.VERTICAL, true);
	rowView.setPreferredHeight(david.getIconHeight());

	// Create the corners
	JPanel buttonCorner = new JPanel();
	isMetric = new JToggleButton("cm", true);
	isMetric.setFont(new Font("SansSerif", Font.PLAIN, 11));
	isMetric.setMargin(new Insets(2,2,2,2));
	isMetric.addItemListener(new UnitsListener());
	buttonCorner.add(isMetric); //Use the default FlowLayout

        // Set up the scroll pane
        picture = new ScrollablePicture(david, columnView.getIncrement());
	JScrollPane pictureScrollPane = new JScrollPane(picture);
	pictureScrollPane.setPreferredSize(new Dimension(300, 250));
	pictureScrollPane.setViewportBorder(BorderFactory.createLineBorder(Color.black));

	pictureScrollPane.setColumnHeaderView(columnView);
	pictureScrollPane.setRowHeaderView(rowView);

	pictureScrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, 
					buttonCorner);
	pictureScrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER,
					new Corner());
	pictureScrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER,
					new Corner());

	// Put it in this panel
	setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
        add(pictureScrollPane);
        setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
    }

    class UnitsListener implements ItemListener {
        public void itemStateChanged(ItemEvent e) {
	    if (e.getStateChange() == ItemEvent.SELECTED) {
                //turn it to metric
		rowView.setIsMetric(true);
		columnView.setIsMetric(true);
	    } else {
                //turn it to inches
		rowView.setIsMetric(false);
		columnView.setIsMetric(false);
	    }
	    picture.setMaxUnitIncrement(rowView.getIncrement());
        }
    }


    public static void main(String s[]) {
        JFrame frame;
        WindowListener l = new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
        };
 
        frame = new JFrame("ScrollDemo");
        frame.addWindowListener(l);
        frame.getContentPane().add("Center", new ScrollDemo());
        frame.pack();
        frame.setVisible(true);
    }
}