Desktop Icon for JInternalFrame goes behind an existing icon

Name: sv35042 Date: 10/18/2002


FULL PRODUCT VERSION :
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

FULL OPERATING SYSTEM VERSION :

Linux 2.4.12 #2 i686

A DESCRIPTION OF THE PROBLEM :
The Location for JInternalFrame's Desktop icon is computed
only once when the first time the internal frame is being
iconified. The bounds computed at the first instance will be
used for subsequent iconifications.

If i may quote from the java source, i observed that the
method: inconifyFrame() DefaultDesktopManager.java invokes
getBoundsForIconOf() only when wasIcon() method returns false.

Now, this wasIcon() relies on the property
HAS_BEEN_ICONIFIED_PROPERTY which is set when the
internalframe is iconified for the first time and this TRUE
value is used subsequently.

As a result, if you de-iconify an internalframe and then
minimize at a later point in time, the icon is placed at the
previos location without checking if any other icon has
taken its place in the meantime.

The net effect is that the latest icon goes behind an
existing icon.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create a JDesktopPane of a smaller size.
2. Add 2 internalframes to the above JDesktopPane
3. Resize the desktop pane to so small a size that when the
internal frames are iconified, they get stacked up one on other.
4. De-iconify the bottom icon and move the top icon to bottom.
5. Now, Iconify the previosly de-iconified internal-frame.
6. This one disappears because the new icon tried to occupy
previos location which is now occupied by a new icon. So,
the second icon goes behind the first icon and hence appears
to have been disappeared.

EXPECTED VERSUS ACTUAL BEHAVIOR :
I expect Java to compute the best possible location for each
iconify action and not only for the first time and keep
using the same location without worrying if any other icon
has been positioned at the old location

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER WORKAROUND :
Extend DefaultDesktopManager.java and overried

protected boolean wasIcon(JInternalFrame f)

to always return false. This forces iconifyFrame() method in
DefaultDesktopManager to always compute the location.
(Review ID: 159779)
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