import javax.swing.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.*;
import java.util.ArrayList;

/**
 * Created by IntelliJ IDEA.
 * Date: 28.12.2005
 * Time: 11:36:12
 */
public class ExplorerPane extends JList {

    private Point start;
    private Point end;

    public void paint(Graphics g) {
        super.paint(g);
        if (start!=null && end!=null) {
            Graphics2D g2 = (Graphics2D) g;
            g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,  0 .5f));
            g2.setPaint(Color.blue);
            g2.fillRect(
                    new Long(Math.min(Math.round(start.getX()), Math.round(end.getX()))).intValue(),
                    new Long(Math.min(Math.round(start.getY()), Math.round(end.getY()))).intValue(),
                    new Long(Math.round(Math.abs(end.getX() - start.getX()))).intValue(),
                    new Long(Math.round(Math.abs(end.getY() - start.getY()))).intValue()
            );
        }
    }

    public ExplorerPane() {
        getSelectionModel().setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        addMouseListener(new MouseAdapter() {
            public void mouseReleased(MouseEvent e) {
                end = e.getPoint();
                doSelection(start, end);
                start = null;
                end = null;
                repaint();
            }
        });
        addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseDragged(MouseEvent e) {
                if (start == null) {
                    start = e.getPoint();
                }
                end = e.getPoint();
                doSelection(start, end);
                repaint();
            }
        });
        setLayoutOrientation(HORIZONTAL_WRAP);
        setVisibleRowCount( 0 );
    }


    public void doSelection(Point start, Point end) {
        if (start==null || end==null) {
            return;
        }
        Rectangle r = new Rectangle(
                new Long(Math.min(Math.round(start.getX()), Math.round(end.getX()))).intValue(),
                new Long(Math.min(Math.round(start.getY()), Math.round(end.getY()))).intValue(),
                new Long(Math.round(Math.abs(end.getX() - start.getX()))).intValue(),
                new Long(Math.round(Math.abs(end.getY() - start.getY()))).intValue()
        );
        java.util.List selected = new ArrayList();
        for (int i =  0 ; i < getModel().getSize(); i++) {
            //Point p = indexToLocation(i);
            Rectangle cellr = getCellBounds(i, i);
            if (!(r.intersection(cellr).isEmpty())) {
                selected.add(new Integer(i));
            }
        }
        int[] sel = new int[selected.size()];
        for (int i =  0 ; i < sel.length; i++) {
            sel[i] = ((Integer)selected.get(i)).intValue();
        }
        setSelectedIndices(sel);

        Component[] items = getComponents();
        //setSelectedIndices();
    }


    public static void main(String[] args) {
        JFrame f = new JFrame("ss");
        f.setSize( 500 ,  500 );
        Panel p = new Panel(new BorderLayout());


        DefaultListModel model = new DefaultListModel();
        model.addElement("test1");
        model.addElement("test2");
        model.addElement("test3");
        model.addElement("test4");
        model.addElement("test1");
        model.addElement("test2");
        model.addElement("test3");
        model.addElement("test4");
        model.addElement("test1");
        model.addElement("test2");
        model.addElement("test3");
        model.addElement("test4");
        model.addElement("test1");
        model.addElement("test2");
        model.addElement("test3");
        model.addElement("test4");

        ExplorerPane pane = new ExplorerPane();
        pane.setModel(model);

        p.add(pane, BorderLayout.CENTER);
        f.getContentPane().add(p);
        f.show();
    }
}