[vtkusers] QVTKInteractor problem

[Clinton Stimpson]

 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
>
>
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