[vtkusers] QVTKInteractor problem

[Luis Roberto P. Paula]

Hi Clint,

It is working now.

I just added this at the end of the constructor: QDialog::exec();

I was calling exec outside the class and It wasn't the exec implemented by
QDialog.

Thanks for your help!

Luis

On Wed, Feb 11, 2009 at 2:01 PM, Clinton Stimpson <clinton at elemtech.com>wrote:

>
> Are you showing this dialog on another thread?
>
> Clint
>
> Clinton Stimpson wrote:
>
>>
>> From what you've given, I can't tell what your problem is.  Forget the
>> second event loop idea, its impossible and wouldn't solve anything.  You've
>> already got one running, and that's good enough.
>> How about using a debugger and following where the execution goes from
>> QVTKWidget::mousePressEvent.
>>
>> Clint
>>
>> Luis Roberto P. Paula wrote:
>>
>>> 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<mailto:
>>> 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>
>>>        <mailto: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
>>>
>>>
>>>
>>>  ------------------------------------------------------------------------
>>>
>>>        _______________________________________________
>>>        Powered by www.kitware.com <http://www.kitware.com>
>>>
>>>        Visit other Kitware open-source projects at
>>>        http://www.kitware.com/opensource/opensource.html
>>>
>>>        Please keep messages on-topic and check the VTK FAQ at:
>>>        http://www.vtk.org/Wiki/VTK_FAQ
>>>
>>>        Follow this link to subscribe/unsubscribe:
>>>        http://www.vtk.org/mailman/listinfo/vtkusers
>>>
>>>
>>>
>>>
>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20090211/be68a469/attachment.htm>