It's compounded a bit by the fact that Apple's implementation of
PopupFactory doesn't seem to get the algorithm for deciding when to
use a heavyweight window quite right - sometimes, apparently
randomly, it will use a heavyweight window even though a lightweight
popup would work just fine.
I think heavyweights are used for two reasons. One to get the shadow,
two to get the translucent effect that pop-ups/menus have on OS X. I
wasn't sure if lightweight pop-ups were ever used.
In an earlier 1.4.2 release on Mac OS, heavyweight popups were always
on - the ivar in PopupFactory was hardcoded to the heavyweight
constant, with a note in the sources about "Steve will fix this...";
in a later release this was fixed, but lightweight popups were broken
(I had to put a mac-os version-specific hack into some code in NetBeans
that uses PopupFactory to *force* the popups to be heavyweight). In
the latest version, you sometimes get heavyweight popups, sometimes
lightweight popups; it doesn't seem to be solely determined by whether
a lightweight popup could be used - sometimes you get one, sometimes
you don't. I haven't read the sources for the latest version of
PopupFactory, but I'm guessing it's just reusing a heavyweight popup if
it has a recently used one that hasn't been GC'd or something such.
Anyway, since the drop shadow is provided by the OS for the native
window, my best bet is to implement my own PopupFactory which will do
lightweight popups where possible - that's not hard. But heavyweight
popups will still sometimes be needed - I just need them without the
drop shadow border. I'm not above reflection-based hacks on the window
peer if that's what it takes - it's easy enough to make them fail
gracefully.
Does anyone know a way to turn off the drop shadow for a native window
via Cocoa Java (yes, I know, bad bad bad, don't do that) or a less
egregious client property or something that will do the trick?
-Tim
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