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Bug ID: 4524015 WINDOW_ACTIVATED and WINDOW_ DEACTIVATED events are not always fired
4524015 : WINDOW_ACTIVATED and WINDOW_ DEACTIVATED events are not always fired

Details
Type:
Bug
Submit Date:
2001-11-07
Status:
Closed
Updated Date:
2002-03-21
Project Name:
JDK
Resolved Date:
2002-02-28
Component:
client-libs
OS:
linux
Sub-Component:
java.awt
CPU:
x86
Priority:
P4
Resolution:
Duplicate
Affected Versions:
1.3.1_01
Fixed Versions:

Related Reports
Duplicate:
JDK-4503980 - Focus lost/gain events get lost when gaining focus on external CDE component
Relates:
JDK-4504821 - Focus is not regained sometimes when alt-tabbing between applications

Sub Tasks

Description
Config: Linux + Sawfish/Enligntenment + jdk 1.3.1_01

WINDOW_DEACTIVATED and WINDOW_ACTIVATED events are expected to be fired when the
user switches the focus from/to an AWT Frame.   This does not happen if the user uses Alt+TAB
to do the switching.   This causes a  significant problem for Forte for Java/NetBeans IDE. 
See the IDE bug description at
 
	http://www.netbeans.org/issues/show_bug.cgi?id=16755

After playing with xev utility and studying JDK source code I conclude
that this is a bug in JDK.  XEvent of FocusIn/FocusOut type
is mapped and routed to java.awt.Window iff xev->mode == NotifyNormal,
which does not hold when switching b/w native windows using Alt+Tab.

For jdk 1.3.1 we can work around the bug by hooking into AWTEvent queue
(using AWTEventListener) and react to FOCUS_GAINED event.  The hack is
extremely ugly but it works.  On JDK 1.4 beta3 even FOCUS_GAINED is not
fired so we are out of luck.

Although the testing environment is Linux + Sawfish, I suspect that the same
defect is present on Solaris+CDE

Comments
EVALUATION

Commit to fix in Merlin (Forte)
###@###.### 2001-11-07 

Some text from the responsible engineer, ###@###.### 

the cause of this bug the same as for 4503980 (Focus lost/gain events
get lost when gaining focus on external CDE component).
When we use Alt-Tab to switch between toplevels window receives
FocusIn/FocusOut with NotifyWhileGrabbed mode instead of NormalNotify
expected by our code. This WM behavior looks like a hack (Alt-Tab is not
a standard feature for X11).

When you and Denis discussed 4503980, you decided that now it is too
late/risky to fix this problem, because to fix it we have to change
Solaris native code (this is always too risky :), and so we have a
chance to catch a few new regressions. For example, the same type of
events (FocusIn/Out with NotifyWhileGrabbed mode) arrives when menus
are opened. So potentially we can break a lot of things.

BTW this bug is not a regression, we have the same behavior in 1.3, and
so i suggest to resolve this bug and 4503980 in Hopper/Tiger.  I think
we should commit one of these bugs to Hopper/Tiger and close another
one as duplicate.  

###@###.### 2001-11-08

If we can't fix this for Merlin, we should fix it for Hopper/Tiger.  

###@###.### 2001-11-08


Name: rpR10076			Date: 11/16/2001

commit to hopper and tiger
======================================================================

It's getting too late to put this into Merlin
###@###.### 2001-11-19

Name: dmR10075			Date: 02/28/2002


The bug was fixed along with the 4503980. Closing as duplicate.
###@###.### 2002-02-28



======================================================================
2002-02-28


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