[vtkusers] vtkEventQtSlotConnect

[imran khan]

Thanks. That did the trick :-)

On Thu, Feb 10, 2011 at 11:46 AM, Clinton Stimpson <clinton at elemtech.com>wrote:

> On Thursday, February 10, 2011 07:17:24 am imran khan wrote:
> > Hmmm.... that is weird as I can get mouse moves. Please see code below.
> >
> > vtkEventQtSlotConnect *  connections = vtkEventQtSlotConnect::New();
> >
> > ..  connections->Connect(interactorROI,
> >                        vtkCommand::MouseMoveEvent,
> >                        this,
> >                        SLOT(handleMouseMove()));
> >
> > ..
> >
> > // The slot
> > void myScene::handleMouseMove()
> > {
> >   // get event position
> >   int event_pos[2];
> >   interactorROI->GetEventPosition(event_pos);
> >   qDebug("Move: x=%d : y=%d\n", event_pos[0], event_pos[1]);
> > }
> >
> >
> >
> > Unfortunately the mouse release of any button is still dysfunctional,
> which
> > is a travesty as this
> > is otherwise a very useful class. I wish someone would fix this.
>
>
> vtkEventQtSlotConnect is functional.
>
> Your problem is the vtkInteractorStyle also processes the mouse and
> keyboard
> events along with your Qt slots that you have added.
>
> When vtkInteractorStyle processes mouse down, it grabs focus of mouse and
> key
> events, so you cannot get any mouse or key events until it releases focus.
>
> For example, vtkInteractorStyleTrackballCamera::OnRightButtonDown calls
> this->GrabFocus(this->EventCallbackCommand)
> which then calls
> this->Interactor->GrabFocus(mouseEvents,keypressEvents)
> so only it can get the mouse/key events until it releases focus.
>
> If you instead do this:
>  connections->Connect(interactorROI->GetInteractorStyle(), ... );
> then you won't have this problem.  That prevents vtkInteractorStyle from
> processing any VTK events that you are observing.
>
> --
> Clinton Stimpson
> Elemental Technologies, Inc
> Computational Simulation Software, LLC
> www.csimsoft.com
>
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