package examples;
import java.awt.*;
import javax.swing.*;

public class CascadingLayout extends FlowLayout {
	static final int OFFSET = 15;

	/* (non-Javadoc)
	 * @see java.awt.FlowLayout#preferredLayoutSize(java.awt.Container)
	 */
	@Override
	public Dimension preferredLayoutSize(Container c) {
		layoutContainer(c);
		Component[] children = c.getComponents();
		if (children.length > 0) {
			Rectangle r = children[children.length-1].getBounds();
			return new Dimension(r.x+r.width, r.y+r.height);
		}
		return super.preferredLayoutSize(c);
	}

	/* (non-Javadoc)
	 * @see java.awt.FlowLayout#layoutContainer(java.awt.Container)
	 */
	@Override
	public void layoutContainer(Container c) {
		Component[] children = c.getComponents();
		int i = 0;
		for (Component comp: children) {
			comp.setLocation(i,i);
			comp.setSize(comp.getPreferredSize());
			((JComponent) comp).setOpaque(false);
			i += OFFSET;
		}
	}
	
	public static void main(String[] args) {
		JFrame f = new JFrame("Cascade");
		f.setLayout(new CascadingLayout());
		for (int i = 0; i < 10; i++)
			f.add(new JButton("button " + i));
		f.pack();
		f.setVisible(true);
	}
}