On Jun 6, 2006, at 11:07 AM, David Niemeijer wrote:
At 8:07 -0700 6/6/06, Eric Schlegel wrote:
Yes, this is definitely a bug. The Window Manager (actually the
CoreGraphics window server) is supposed to layer a newly visible
window behind the active window of the active app, not in front.
The bug is actually not in the application that is showing the
window, but in the active application; somehow its active window
is not being properly recorded and passed to the window server.
If you, or David, can reliable reproduce this problem, please file
bugs and send me the bug numbers. We need repro cases to determine
why the active window isn't being properly recorded.
It took me some time to figure out the exact conditions that cause
the problem, because when I built a test app of course the problem
first did not appear. But in the end I figured it out and build a
test app and filed a bug. See bug: 4575443. The problem only occurs
when the background app has a visible utility window. I guess that
confuses the window ordering.
Ah, yes, I see the problem. When you show the new document window,
the Window Manager tells the window server to position it behind the
window that it is behind in your app's window list. That's the
utility window. Since the utility window is at a higher window level
than the document windows of the frontmost app, this causes your
document to be positioned above the windows of the frontmost app.
I doubt this is causing all of the problems that Steve mentioned
seeing, though. Steve, if you come up with any other reproducible
cases, please let me know.
I have some ideas for how to fix this in the Window Manager for
Leopard. As a workaround for pre-Leopard, I suggest disabling screen
updates, hiding all of the visible windows in the utility window
group, showing your document window, showing the windows in the
utility group again, and then enabling screen updates. I tested this
in your sample app and it worked. Here's my modifications to HandleNew
():
group = GetWindowGroupOfClass( kUtilityWindowClass );
windowCount = CountWindowGroupContents( group,
kWindowGroupContentsReturnWindows | kWindowGroupContentsRecurse |
kWindowGroupContentsVisible );
windows = (WindowRef*) alloca( sizeof( WindowRef ) * windowCount );
GetWindowGroupContents( group, kWindowGroupContentsReturnWindows |
kWindowGroupContentsRecurse | kWindowGroupContentsVisible,
windowCount, &windowCount, (void**) windows );
for ( i = 0; i < windowCount; i++ )
ShowHide( windows[i], false );
// The window was created hidden, so show it
ShowWindow( window );
for ( i = 0; i < windowCount; i++ )
ShowHide( windows[i], true );
EnableScreenUpdates();
-eric
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