Problem 1959

Summary:	stand alone qt application not working
Product:	Geant4	Reporter:	ungaro
Component:	visualization/OpenGL	Assignee:	John.Allison
Status:	RESOLVED FIXED
Severity:	normal	CC:	garnier, laurent.garnier
Priority:	P4
Version:	10.3
Hardware:	Apple
OS:	All
Attachments:	screenshot1 screenshot 2

Description ungaro 2017-03-22 14:51:22 CET

Starting with 10.3 and 10.3.p01 using a 

	QApplication *app = new QApplication(argc, argv);

in main() will cause the opengl window to be non-responsive.
For example, rotating the view will take effect only after I click on another window.

This can be easily checked by adding the above line at the top of any basic example (I was working with exampleB4a.cc).

Looking forward to feedback, this is preventing me to use 10.3.X, as 10.2.X is working properly (is this maybe due to the new opengl refresh?).

Mauri

Comment 1 John.Allison 2017-03-22 15:14:07 CET

Please explain why you need to add

	QApplication *app = new QApplication(argc, argv);

Why not use - or are you also using - G4UIExecutive?

Comment 2 ungaro 2017-03-22 15:34:19 CET

Created attachment 447 [details]
screenshot1

s

Comment 3 ungaro 2017-03-22 15:36:11 CET

We are running a custom Qt-interface, thus the need of a QApplication.

I'm attaching a couple of screenshots.

This is the application website. This is used by several experiments.

https://gemc.jlab.org/gemc/html/index.html

Laurent assisted us in the past to make sure QtGUI was working properly.

Thanks,

Comment 4 ungaro 2017-03-22 15:36:48 CET

Created attachment 448 [details]
screenshot 2

Comment 5 ungaro 2017-03-22 15:40:47 CET

To answer the G4UIExecutive question: using it or not using does not affect the problem. See for example exampleB4a.cc.

Thanks,
Mauri

Comment 6 garnier 2017-03-24 17:05:43 CET

Hi Maurizio, 

I could reproduce your problem, perhaps a openGL refresh problem in Qt with an external QApp. I'll investigate.

Laurent

Comment 7 garnier 2017-03-24 17:34:06 CET

Ok, I think I've got it :

I did a change to prevent extra repaints 6 months ago (10.3 version affected, but not 10.2)

G4OpenGLQtViewer.cc, around line 4643 :

Could you try the following patch:

bool G4OpenGLQtViewer::isCurrentWidget(){

// Add theses lines ==============
  G4Qt* interactorManager = G4Qt::getInstance ();
  if (!interactorManager->IsExternalApp()) {
// End of added lines ==============

    // Prevent from repainting a hidden tab (the current tab name has to be the one of th GL viewer)
    if ( GetName() != fUiQt->GetViewerTabWidget()->tabText(fUiQt->GetViewerTabWidget()->currentIndex()).toStdString().c_str()) {
      return false;
    }


// Add theses lines ==============
  }
// End of added line ==============


  return true;
}


Laurent

Comment 8 ungaro 2017-03-24 19:08:01 CET

Laurent's patch fixed the problem, thanks!