Name: nkR10003 Date: 10/16/2000


JavaDoc comments for method BasicListUI.locationToIndex state:
"Convert a point in JList coordinates to the index of the cell
at that location. Returns -1 if there's no cell the specified
location". Actually locationToIndex method returns positive value
for any point with valid Y coordinate. For example (-1, 0) point
locationToIndex method converts to 0 index instead of -1.
The same problem appears with JList.locationToIndex method because
it forwards the call to UI delegate locationToIndex method.

Example below demonstrates this problem:
------------------example--------------------
import javax.swing.*;
import java.lang.*;
import java.lang.reflect.*;
import java.awt.*;

public class test {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Test");
        String[] data = {"one", "two", "three"};
        final JList list = new JList(data);
        frame.getContentPane().add(list);
        frame.setSize(list.getPreferredScrollableViewportSize());
        frame.setVisible(true);
        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                public synchronized void run() {
                    System.out.println("x: -1");
                    System.out.println("y: 0");
                    System.out.println("index: "
                            + list.locationToIndex(new Point(-1,0)));
                    System.out.println("UI: " + list.getUI());
                    System.out.println("UI.index: "
                            + list.getUI().locationToIndex(list, new Point(-1,0)));
                }
            });
        } catch (InterruptedException ie) {
            ie.printStackTrace();
        } catch (InvocationTargetException ite) {
            ite.printStackTrace();
        } finally {
            try {
                Thread.sleep(10000);
            } catch (InterruptedException ie) {}
            frame.dispose();
            System.exit(0);
        }
    }
}
----------------output:----------------------
x: -1
y: 0
index: 0
UI: javax.swing.plaf.basic.BasicListUI@16ab4e
UI.index: 0
---------------------------------------------
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