[vtkusers] QVTKInteractor problem

[Clinton Stimpson]

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
>>
>>
>>         
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>
>
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