[vtkusers] Qt with QVTKWidget: Setting a QLabel's parent widget to a QVTKWidget Problem

[Clinton Stimpson]

Ok, I was able to reproduce.  It is transparent by default, so you can call 
setAutoFillBackground(true) on the QLabel.

Clint

On Monday 04 January 2010 01:29:58 pm Steven Ferrell wrote:
> Just call winId() on it?  No visible change.
>
> On Mon, Jan 4, 2010 at 1:12 PM, Clinton Stimpson 
<clinton at elemtech.com>wrote:
> > Can you try calling winId() on the QLabel to force Qt to let the
> > operating system do the image composition for those widgets.
> >
> > Clint
> >
> > On Monday 04 January 2010 11:02:20 am Steven Ferrell wrote:
> > > *(including VTK Users in the discussion)*
> > >
> > > http://imgur.com/8OU4E
> > >
> > > Brief on what you're seeing: this is a Qt window that uses
> > > QDockWidgets. The center widget is a qt mdi actor which holds four
> > > QVTKWidgets.  Each
> >
> > of
> >
> > > those widgets has two renderers, one for the actor and one for the xyz
> >
> > axis
> >
> > > actor.  There is a label for each vtkwidget which you can see in the
> > > top left of each of the four render windows.. they are for some reason
> >
> > rendered
> >
> > > as black and no text is visible.
> > >
> > > The first image is what it looks like when it starts up.  Just a black
> >
> > area
> >
> > > where the label should be, no text.  When I resize the left dock
> > > widget, something happens with the text (garbled) in the label as you
> > > can see in the second image.
> > >
> > > Based on your responses so far I would imagine that this is unusual and
> > > that it should be fine as I have described it.  I have encountered
> >
> > similar
> >
> > > things before in Qt/VTK and they tend to just clear themselves up
> > > almost randomly (e.g. among a couple of other weird things I've run
> > > into so far, for some reason titles weren't displayed in my dock
> > > widgets for a while until I removed a few unused and seemingly
> > > unrelated event handlers for other processes).  I was looking to find
> > > out if there was some obvious behaviour I didn't know about that Qt/VTK
> > > required in order to properly display a widget within a QVTKWidget, but
> > > it's not looking like that's
> >
> > the
> >
> > > case.
> > >
> > > On Mon, Jan 4, 2010 at 11:37 AM, Clinton Stimpson
> >
> > <clinton at elemtech.com>wrote:
> > > > It should work except maybe if you're setting a transparent
> > > > background for the label.  What platform is this problem on?
> > > >
> > > > Clint
> > > >
> > > >
> > > > On 01/04/2010 09:08 AM, Steven Ferrell wrote:
> > > >
> > > > I have created a QLabel which has as its parent a QVTKWidget, ie
> > > > QLabel *renderTitle = new QLabel(title, vtkWidget);
> > > >
> > > > The label text does not render at all normally.  If I resize the
> >
> > windows
> >
> > > > and play around with their size it will eventually show some of the
> >
> > text,
> >
> > > > but it becomes garbled.
> > > >
> > > > Do I need to perform some sort of update within some sort of event in
> > > > order to have a QLabel within a QVTKWidget display properly?
> > > >
> > > >
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