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

[Clinton Stimpson]

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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