[PyQt] setLayout for a QDockWidget

[TP]

Hi,

Try the small script below. I cannot manage to do setLayout for a
QDockWidget: QDockWidget.setWidget() works correctly, but not
QDockwidget.setLayout(), I obtain the following message:

QWidget::setLayout: Attempting to set QLayout "" on QDockWidget "", which
already has a layout

So, with some googling, I found:

http://lists.trolltech.com/pipermail/qt-interest/2008-December/000524.html
http://www.qtcentre.org/forum/f-newbie-4/t-changing-layout-21394.html

It seems that there is a default layout inside a QDockWidget when it is
created. How to delete this default layout in PyQt, and then set as new
layout "vboxlayout" with the spin box in the following code?

Thanks a lot,

Julien

############
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys

app = QApplication( sys.argv )

spin = QSpinBox()
vboxlayout = QVBoxLayout( )
vboxlayout.addWidget( spin )

qmainwin = QMainWindow()

qdock = QDockWidget( )
existing_layout = qdock.layout()
print existing_layout
# how to delete the existing layout??
qdock.setLayout( vboxlayout )

qmainwin.addDockWidget( Qt.TopDockWidgetArea, qdock )
qmainwin.show()

app.exec_()

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