[vtkusers] QVTKInteractor problem

[Luis Roberto P. Paula]

Hi Clint,

In the main window of my application I have a QVTKWidget. I have set some
callbacks to detect mouse events and in this window everything is working
fine.

Then I tried to open a second window (QDialog for example) by clicking on a
button of the main window. In this second window I have also a QVTKWidget
object. I'm displaying an 2D image on it with the vtkImageViewer2 and the
zoom control with the mouse wheel is working fine (default action). The
problem is with the callback that I have created. In the constructor of my
QDialog class it is set like this:

   vtkImageInteractionCallback* callback =
vtkImageInteractionCallback::New();
   imageStyle->AddObserver(vtkCommand::MouseMoveEvent, callback);
   imageStyle->AddObserver(vtkCommand::LeftButtonPressEvent, callback);
   imageStyle->AddObserver(vtkCommand::LeftButtonReleaseEvent, callback);


vtkWidget->GetRenderWindow()->GetInteractor()->SetInteractorStyle(imageStyle);

None of this events are being captured.

I thought it could be something wrong in the code, but when I tried to load
this second window as the main window, everything worked.

   int main(int argc, char *argv[])
   {
      QApplication app(argc, argv);

      /*MyGui* mainWindow = new MyGui;
      mainWindow->show();*/

      MyDialog* dialog = new MyDialog; // HERE IT WORKS, BUT THE DIALOG
SHOULD BE PART OF THE MAIN WINDOW.
      dialog>show();

      return app.exec();
   }

Do you know why this is happening?

Thanks,
Luis

On Wed, Feb 11, 2009 at 2:15 AM, Clinton Stimpson <clinton at elemtech.com>wrote:

>
> So which callbacks aren't working?  I don't see how trying to make another
> event loop would solve a callback problem.
> If its a dialog, why not call exec() on it instead of show() ?  exec() will
> create a temporary local event loop (see QEventLoop).
> Also, each thread can only have one event loop active at a time, and all Qt
> widgets are on the same thread.
>
> Clint
>
> Luis Roberto P. Paula wrote:
>
>> I have set the second window as a Dialog window and open it as modal. For
>> some reason, the callback for this new window are not being observed.
>>
>> On Tue, Feb 10, 2009 at 1:04 AM, Luis Roberto P. Paula <luisrpp at gmail.com<mailto:
>> luisrpp at gmail.com>> wrote:
>>
>>    Hi All,
>>
>>    Since QVTKInteractor cannot control the event loop, how do I start
>>    a second window after the click of a button and make this new
>>    window to have its own event loop?
>>
>>    When the button is clicked, this action is performed:
>>
>>      MyWidget* widget = new   MyWidget();
>>      widget->show();
>>
>>    The new window appears, but to make the interactor to work, there
>>    should be a command like:
>>
>>      qApp->exec();
>>
>>    but QT does not allow me to start a new GUI event loop.
>>
>>    Does anybody can help me?
>>
>>    Thanks,
>>    Luis
>>
>>
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