hugo.rivero@eng 1999-12-09

When creating a Window with JDK 1.1.8_10, the following sequence of events is generated: WINDOW_OPENED, WINDOW_ACTIVATED, FOCUS_GAINED, FOCUS_LOST. The last event is incorrect and should not be posted.

The testcase below has a lightweight component that draws a crosshair in a circle when focus is gained, and removes it when focus is lost. When the window is created, it behaves incorrectly as described above. The right behavior is for the (only) component to obtain the focus after window activation.

Note that on Win32 with the same testcase, focus is never delivered to the lightweight component (see bug 4264600).

import java.awt.*;
import java.awt.event.*;
public class FocusTest extends Frame implements WindowListener
{
static public void main(String[] args) {
(new FocusTest()).setVisible(true);
}
public FocusTest() {
super("Focus Test");
Panel panel = new Panel();
add(panel);
LightWeight lw = new LightWeight();
addWindowListener(this);
panel.add(lw);
pack();
lw.requestFocus();
}
public void windowOpened(WindowEvent e){}
public void windowClosing(WindowEvent e) {
System.exit(0);
}
public void windowClosed(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void windowActivated(WindowEvent e) {
System.out.println("windowActivated");
}
public void windowDeactivated(WindowEvent e){
System.out.println("windowDeactivated");
}

// A very simple lightweight component
class LightWeight extends Component implements FocusListener {

boolean focused = false;

public LightWeight() {
addFocusListener(this);
}

public void paint(Graphics g) {
Dimension size = getSize();
int w = size.width;
int h = size.height;
g.drawOval(0, 0, w-1, h-1);
if (focused) {
g.drawLine(w/2, 0, w/2, h);
g.drawLine(0, h/2, w, h/2);
}

}

public Dimension getPreferredSize() {
return new Dimension(150, 150);
}

public void focusGained(FocusEvent e) {
focused = true;
System.out.println("focusGained");
repaint();
}

public void focusLost(FocusEvent e) {
focused = false;
System.out.println("focusLost");
repaint();
}

        }
}