Name: aaR10142 Date: 06/28/2000


SwingUtilities.convertPointToScreen() and
SwingUtilities.convertPointFromScreen() methods throw unspecified
IllegalComponentStateException
The javadoc says nothing about it.

The javadoc says:"
public static void convertPointFromScreen(Point p,
                                          Component c)

      Convert a point from a screen coordinates to a
      component's coordinate system
      Parameters:
            p - a Point object (converted to the new
            coordinate system)
            c - a Component object


"

All works correctly in jdk1.3
See example

------------------------- example ----------------
import javax.swing.*;
import java.awt.Point;

public class Test {

    public static void main(String argv[]) {
        JFrame c = new JFrame();
        Point pt=new Point(0,0);

        SwingUtilities.convertPointToScreen(pt, c);
        System.out.println("result:"+ pt);

        SwingUtilities.convertPointFromScreen(pt, c);
        System.out.println("result:"+ pt);

     }

}

------------------------- jdk1.4 output ----------------
Exception in thread "main" java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
        at java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:1316)
        at java.awt.Component.getLocationOnScreen(Component.java:1290)
        at javax.swing.SwingUtilities.convertPointToScreen(SwingUtilities.java:255)
        at Test.main(Test.java:10)
------------------------- jdk1.3 output ----------------
result:java.awt.Point[x=0,y=0]
result:java.awt.Point[x=0,y=0]

======================================================================