-
Bug
-
Resolution: Unresolved
-
P5
-
None
-
1.4.2, 5.0, 6
-
Cause Known
-
x86, itanium
-
windows_nt, windows_2000
Name: diC59631 Date: 02/05/98
Symptoms: AWT windows "flash" or "vibrate" rapidly and are hard to close
To reproduce the problem:
[1] compile the enclosed awtwin.java
[2] run "appletviewer awtwin.html"
[3] click the AWT window 5 times quickly to create 5 windows
The problem will not occur if clicked slowly,
i.e. one click after one window is created.
What appears to be happening is that the AWT is not detecting that a window
has been activated if focus is requested and there is a processing load prior
to launching the window.
================ awtwin.html ================
<HTML>
<HEAD>
<TITLE> AWT Window Problem Demonstration </TITLE>
</HEAD>
<BODY>
<APPLET CODE="awtwin.class" WIDTH=300 HEIGHT=350>
</APPLET>
</BODY>
</HTML>
================ awtwin.java ================
// Test of requestFocus() calls within multiple windows.
//
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class awtwin extends Applet implements MouseListener {
static int Count = 0;
static final String maxed_out = new String("Maximum of 5 test windows.");
static final int margin = 100;
FontMetrics fm;
Dimension d;
Label l;
public void init() {
setLayout(new BorderLayout());
add ("North", l = new Label("Demonstration of AWT Window problem.", Label.CENTER));
addMouseListener(this);
}
public void addNotify() {
super.addNotify();
Font f = getFont();
if (f != null)
fm = getFontMetrics(f);
}
public void mouseClicked (MouseEvent evt) {
if (Count < 5) {
Count++;
String Title = new String("Test Window " + Count);
int wd = fm.stringWidth(Title) + margin;
d = new Dimension(wd, wd);
TestWindow tw = new TestWindow(Title, d);
tw.show();
// Addition of the line below increased the chances of inducing the problem significantly.
// This suggests a timing problem.
try { Thread.sleep(1000); } catch ( InterruptedException e) { ; }
}
else l.setText(maxed_out);
}
public void mouseEntered (MouseEvent evt) { }
public void mouseExited (MouseEvent evt) { }
public void mousePressed (MouseEvent evt) { }
public void mouseReleased (MouseEvent evt) { }
class TestWindow extends Frame implements WindowListener {
public TestWindow(String Title, Dimension d) {
super (Title);
setSize(d);
addWindowListener(this);
}
public void windowActivated(WindowEvent e) {
requestFocus();
}
public void windowClosed(WindowEvent e) {
}
public void windowClosing(WindowEvent e) {
this.dispose();
Count--;
}
public void windowDeactivated(WindowEvent e) { }
public void windowDeiconified(WindowEvent e) { }
public void windowIconified(WindowEvent e) { }
public void windowOpened(WindowEvent e) { }
}
}
(Review ID: 24619)
======================================================================
Name: skT88420 Date: 08/20/99
We have been experiencing a whole load of problems with windowActivated
and JRE 1.2.2.
1. With some programs which subclass Frame or Dialog, when launched
from another Frame or Dialog, focus is not given to a component
which requests it from windowActivated.
2. A requestFocus, issued from windowActivated, only appears to work
once, the first time it is called; that is when it does work.
The following code demonstrates this. When the windows Activate2 and
Activate3 appear, click in the second field, lose focus on the Frame
by clicking on another window, gain focus back on the first window by
clicking on it. Focus remains on the second field, even though the
windowActivated method is executed and it explicitly requests focus on
the first field.
The example code will also show a windows focus war if a certain line,
in Activate2, is uncommented.
import java.awt.*;
import java.awt.event.*;
class ActivateTest extends Frame
{
TextField tf = new TextField();
public ActivateTest( String name)
{
super( name);
tf.setColumns( 20);
add( tf);
addWindowListener(
new WindowAdapter()
{
public void windowActivated( WindowEvent we)
{
///tf.requestFocus();
}
public void windowOpened( WindowEvent we)
{
Activate2 at2 = new Activate2("Activate2");
at2.pack();
at2.show();
}
public void windowClosing( WindowEvent we)
{
dispose();
}
}
);
}
public static void main(String argv[] )
{
ActivateTest at = new ActivateTest("ActivateTest");
at.pack();
at.show();
}
}
import java.awt.*;
import java.awt.event.*;
class Activate2 extends Frame
{
TextField tf = new TextField();
TextField tf2 = new TextField();
public Activate2( String name)
{
super(name);
setLayout( new FlowLayout());
tf.setColumns( 20);
tf2.setColumns( 20);
tf2.setText( "Hello");
add( tf);
add( tf2);
addWindowListener(
new WindowAdapter()
{
public void windowActivated( WindowEvent we)
{
System.out.println("Activate2 Activated and Requesting focus");
//
//tf should always get focus when window activated. Not with JRE 1.2.2
//Only first time this is executed does the field in question normally,
//but not always, get focus.
tf.requestFocus();
System.out.println("Focus owner post requestFocus: " + getFocusOwner().toString());
}
public void windowClosing( WindowEvent we)
{
dispose();
}
public void windowOpened( WindowEvent we)
{
Activate3 at3 = new Activate3( "Activate3");
at3.pack();
at3.show();
//
//Uncomment the next line to start vibrator. In JRE 1.1.3, focus wars with
//all three windows until one is killed. In JRE 1.2.2 focus wars with all three
//windows until one is minimised!! Then focus wars stop, even when minimised
//window is maximised!?!?!
///tf.requestFocus();
}
}
);
}
}
import java.awt.*;
import java.awt.event.*;
class Activate3 extends Frame
{
TextField tf = new TextField();
TextField tf2 = new TextField();
public Activate3( String name)
{
super(name);
setLayout( new FlowLayout());
tf.setColumns( 20);
tf2.setColumns( 20);
tf2.setText( "Act3");
add( tf);
add( tf2);
addWindowListener(
new WindowAdapter()
{
public void windowActivated( WindowEvent we)
{
System.out.println("Activate3 Activated and Requesting focus");
tf.requestFocus();
System.out.println("Activate3 Focus owner post requestFocus: " + getFocusOwner().toString());
}
public void windowClosing( WindowEvent we)
{
dispose();
}
}
);
}
}
(Review ID: 94162)
======================================================================
###@###.### 10/4/04 16:42 GMT
Symptoms: AWT windows "flash" or "vibrate" rapidly and are hard to close
To reproduce the problem:
[1] compile the enclosed awtwin.java
[2] run "appletviewer awtwin.html"
[3] click the AWT window 5 times quickly to create 5 windows
The problem will not occur if clicked slowly,
i.e. one click after one window is created.
What appears to be happening is that the AWT is not detecting that a window
has been activated if focus is requested and there is a processing load prior
to launching the window.
================ awtwin.html ================
<HTML>
<HEAD>
<TITLE> AWT Window Problem Demonstration </TITLE>
</HEAD>
<BODY>
<APPLET CODE="awtwin.class" WIDTH=300 HEIGHT=350>
</APPLET>
</BODY>
</HTML>
================ awtwin.java ================
// Test of requestFocus() calls within multiple windows.
//
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class awtwin extends Applet implements MouseListener {
static int Count = 0;
static final String maxed_out = new String("Maximum of 5 test windows.");
static final int margin = 100;
FontMetrics fm;
Dimension d;
Label l;
public void init() {
setLayout(new BorderLayout());
add ("North", l = new Label("Demonstration of AWT Window problem.", Label.CENTER));
addMouseListener(this);
}
public void addNotify() {
super.addNotify();
Font f = getFont();
if (f != null)
fm = getFontMetrics(f);
}
public void mouseClicked (MouseEvent evt) {
if (Count < 5) {
Count++;
String Title = new String("Test Window " + Count);
int wd = fm.stringWidth(Title) + margin;
d = new Dimension(wd, wd);
TestWindow tw = new TestWindow(Title, d);
tw.show();
// Addition of the line below increased the chances of inducing the problem significantly.
// This suggests a timing problem.
try { Thread.sleep(1000); } catch ( InterruptedException e) { ; }
}
else l.setText(maxed_out);
}
public void mouseEntered (MouseEvent evt) { }
public void mouseExited (MouseEvent evt) { }
public void mousePressed (MouseEvent evt) { }
public void mouseReleased (MouseEvent evt) { }
class TestWindow extends Frame implements WindowListener {
public TestWindow(String Title, Dimension d) {
super (Title);
setSize(d);
addWindowListener(this);
}
public void windowActivated(WindowEvent e) {
requestFocus();
}
public void windowClosed(WindowEvent e) {
}
public void windowClosing(WindowEvent e) {
this.dispose();
Count--;
}
public void windowDeactivated(WindowEvent e) { }
public void windowDeiconified(WindowEvent e) { }
public void windowIconified(WindowEvent e) { }
public void windowOpened(WindowEvent e) { }
}
}
(Review ID: 24619)
======================================================================
Name: skT88420 Date: 08/20/99
We have been experiencing a whole load of problems with windowActivated
and JRE 1.2.2.
1. With some programs which subclass Frame or Dialog, when launched
from another Frame or Dialog, focus is not given to a component
which requests it from windowActivated.
2. A requestFocus, issued from windowActivated, only appears to work
once, the first time it is called; that is when it does work.
The following code demonstrates this. When the windows Activate2 and
Activate3 appear, click in the second field, lose focus on the Frame
by clicking on another window, gain focus back on the first window by
clicking on it. Focus remains on the second field, even though the
windowActivated method is executed and it explicitly requests focus on
the first field.
The example code will also show a windows focus war if a certain line,
in Activate2, is uncommented.
import java.awt.*;
import java.awt.event.*;
class ActivateTest extends Frame
{
TextField tf = new TextField();
public ActivateTest( String name)
{
super( name);
tf.setColumns( 20);
add( tf);
addWindowListener(
new WindowAdapter()
{
public void windowActivated( WindowEvent we)
{
///tf.requestFocus();
}
public void windowOpened( WindowEvent we)
{
Activate2 at2 = new Activate2("Activate2");
at2.pack();
at2.show();
}
public void windowClosing( WindowEvent we)
{
dispose();
}
}
);
}
public static void main(String argv[] )
{
ActivateTest at = new ActivateTest("ActivateTest");
at.pack();
at.show();
}
}
import java.awt.*;
import java.awt.event.*;
class Activate2 extends Frame
{
TextField tf = new TextField();
TextField tf2 = new TextField();
public Activate2( String name)
{
super(name);
setLayout( new FlowLayout());
tf.setColumns( 20);
tf2.setColumns( 20);
tf2.setText( "Hello");
add( tf);
add( tf2);
addWindowListener(
new WindowAdapter()
{
public void windowActivated( WindowEvent we)
{
System.out.println("Activate2 Activated and Requesting focus");
//
//tf should always get focus when window activated. Not with JRE 1.2.2
//Only first time this is executed does the field in question normally,
//but not always, get focus.
tf.requestFocus();
System.out.println("Focus owner post requestFocus: " + getFocusOwner().toString());
}
public void windowClosing( WindowEvent we)
{
dispose();
}
public void windowOpened( WindowEvent we)
{
Activate3 at3 = new Activate3( "Activate3");
at3.pack();
at3.show();
//
//Uncomment the next line to start vibrator. In JRE 1.1.3, focus wars with
//all three windows until one is killed. In JRE 1.2.2 focus wars with all three
//windows until one is minimised!! Then focus wars stop, even when minimised
//window is maximised!?!?!
///tf.requestFocus();
}
}
);
}
}
import java.awt.*;
import java.awt.event.*;
class Activate3 extends Frame
{
TextField tf = new TextField();
TextField tf2 = new TextField();
public Activate3( String name)
{
super(name);
setLayout( new FlowLayout());
tf.setColumns( 20);
tf2.setColumns( 20);
tf2.setText( "Act3");
add( tf);
add( tf2);
addWindowListener(
new WindowAdapter()
{
public void windowActivated( WindowEvent we)
{
System.out.println("Activate3 Activated and Requesting focus");
tf.requestFocus();
System.out.println("Activate3 Focus owner post requestFocus: " + getFocusOwner().toString());
}
public void windowClosing( WindowEvent we)
{
dispose();
}
}
);
}
}
(Review ID: 94162)
======================================================================
###@###.### 10/4/04 16:42 GMT
- duplicates
-
-
- Closed
-
-
-
- Closed
-