Qt-interest Archive, December 2006
Sheet fails to open [SOLUTION]
Message 1 in thread
This took me a little while to figure out, so I thought I'd just post
the question and answer to the list for future reference for others.
I was trying to open a QDialog on MacOS X as a sheet. This was
failing and I was seeing the following message being printed to the
debugger: "Qt: QWidget: Unable to show as sheet [-50]". Previously
this had been working.
The Macintosh error code -50 is paramErr. Qt is making a call to
WindowSheet() which is returning this error. It was not immediately
clear to me what was causing this error.
It turns out that the when you make the call setWindowTitle() on the
QDialog, this will cause it not to open correctly as a sheet. This is
probably causing the QDialog to create the wrong attributes for the
window to be a sheet which may be the cause for the paramErr.
Someone (like me) may add this call so that on platforms other than
MacOS X (Windows, Linux), the dialog will be shown with a correct
title. With sheets, obviously you don't need a windowTitle.
One solution for this is simply not to call setWindowTitle() on your
QDialog on MacOS X. This can be accomplished by using #ifndef
Q_WS_MAC around the call to setWindowTitle().
Brant Sears
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Message 2 in thread
Hi,
Brant Sears wrote:
> It turns out that the when you make the call setWindowTitle() on the
> QDialog, this will cause it not to open correctly as a sheet. This is
> probably causing the QDialog to create the wrong attributes for the
> window to be a sheet which may be the cause for the paramErr.
>
> Someone (like me) may add this call so that on platforms other than
> MacOS X (Windows, Linux), the dialog will be shown with a correct title.
> With sheets, obviously you don't need a windowTitle.
Did you file this as a defect? Seems like one to me... (apologies if
someone already suggested this)
Tim
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