[Qt-interest] setLayout for QMainWindow

[Steven Woody]

On Tue, Jan 20, 2009 at 5:56 PM, Andreas Pakulat <apaku at gmx.de> wrote:
> On 20.01.09 16:57:14, Steven Woody wrote:
>> On Tue, Jan 20, 2009 at 4:38 PM, Andreas Pakulat <apaku at gmx.de> wrote:
>> > On 20.01.09 15:52:57, Steven Woody wrote:
>> >> On Tue, Jan 20, 2009 at 3:12 PM, J-P Nurmi <jpnurmi at gmail.com> wrote:
>> >> > On Tue, Jan 20, 2009 at 5:21 AM, Steven Woody <narkewoody at gmail.com> wrote:
>> >> >>
>> >> >> Hi,
>> >> >>
>> >> >> Does it make any sense if I call setLayout() member for a QMainWindow?
>> >> >
>> >> > You're on the right track. QMainWindow has its own private layout to handle
>> >> > toolbars, dock widgets, status bar etc. so it doesn't make sense, indeed.
>> >> > The main window layout is described in QMainWindow documentation.
>> >> >
>> >>
>> >> Thank you!  And, I am thinking that if QMainWindow can override the
>> >> setLayout() method and raise a exception when it is invoked, thinks
>> >> will be more clear and less confusing.
>> >
>> > Not really, as Qt doesn't use exceptions and more importantly its
>> > technically not possible (in Qt4). setLayout is non-virtual so you can't
>> > override it easily and being sure your overridden method is always called.
>> > All it takes is a cast to QWidget, or some function that takes a QWidget as
>> > input and calls setLayout.
>> >
>> > Besides, nobody stops you from writing your own mainwindow layouting class
>> > and use that instead of the normal layout class that QMainWindow uses.
>>
>> Thank you for your explanation.  And, if not bothering you,  since I
>> am not using C++/Qt and actually using Python Qt, so I am interesting
>> another question:  you know, in Python any method is virtual, so even
>> though the setLayout() is non-virtual in C++,  I think it should be
>> virtual in Python Qt, am I right?
>
> But QMainWindow is a C++ class, so C++ rules apply. PyQt only wraps the C++
> API to make it accessible in Python. What you probably could do is write
> your own QMainWindow subclass in Python that overrides setLayout()
> apropriately and then always use that one instead of QMainWindow directly.
> This might still break if any non-Python code accesses such a mainwindow.
>
> Andreas
>

Get it. Thanks!