[PyQt] MdiSubWindows: what causes inactive (or hidden) subwindows?

[Anonymous]

> From: David Boddie <david at boddie.org.uk>
> Subject: Re: [PyQt] MdiSubWindows: what causes inactive (or hidden) subwindows?
> To: pyqt at riverbankcomputing.com
> Date: Monday, November 24, 2008, 6:41 PM
> 
> 
> What happens when the QMdiArea is configured to use
> SubWindowView?

The following messages show up in standard output:

QPainter::begin: Cannot paint on a null pixmap
QPainter::setRenderHint: Painter must be active to set rendering hints


> If you post a minimal or short code example then maybe we
> can help you figure
> out what's happening.

Here's the relevant function, it gets called when the itemDoubleClicked() signal is emitted:

def addTab(self, cItem = None, col = None):
       sub = QtGui.QMdiSubWindow(self.ui.BibleArea);
       sub.setAttribute(Qt.WA_DeleteOnClose);
       textEdit = QtGui.QTextEdit();
       textEdit.setReadOnly(True);
       textEdit.setFocusPolicy(Qt.NoFocus);
       textEdit.setMouseTracking(True);
       textEdit.__class__.mouseMoveEvent = self.getLinkRef;
       sub.setWidget(textEdit);
       if cItem is not None:
              sub.setWindowTitle(str(cItem.text(col)));
              self.viewBook(str(cItem.text(col)), textEdit);
       else:
              sub.setWindowTitle(self.defBible);
              self.viewBook(self.defBible, textEdit);