[osg-users] MousepressEvent not able to capture from osg::Viewer by Qt

[Sujan Dasmahapatra]

I am trying to implement a mouse press event with QT and OSG but unable to do it. Pls help.

Below is my ViewerWidget class which is derived from QWidget and osg::CompositeViewer......In the constructor I got gView which is a osg::GLWidget, I am trying override mousePressEvent but when I click message not coming. What I am doing wrong pls help..

My gView pointer is of class CSGraphicsView as below

/////////////////////////////////////////////////////////////////////////////////

#ifndef GVIEW_H

#define GVIEW_H

#include <osg\GraphicsContext>

#include <osgQt\GraphicsWindowQt>

#include <QtGui\qwidget.h>

#include <QtCore\qobject.h>

#include <QtGui\qmouseeventtransition.h>

class CSGraphicsView : public osgQt::GLWidget

{

public:

CSGraphicsView(QWidget* parent=0);

~CSGraphicsView();

virtual void mousePressEvent(QMouseEvent *e);

};

#endif // GVIEW_H

//Implementations is 

void CSGraphicsView::mousePressEvent(QMouseEvent *e)

{

QMessageBox msg;

msg.setText("Mouse pressed");

msg.exec();

}//But this msg is not coming when i am pressing mouse.

/////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////

ViewerWidget::ViewerWidget(osgViewer::ViewerBase::ThreadingModel threadingModel, osg::Group* scene) : QWidget()

    {

        setThreadingModel(threadingModel);

        gView = static_cast<CSGraphicsView*> (addViewWidget( createCamera(0,0,100,100), scene ));

        QGridLayout* grid = new QGridLayout;

        grid->addWidget( gView, 0, 0 );

        setLayout( grid );

        connect( &_timer, SIGNAL(timeout()), this, SLOT(update()) );

        _timer.start( 10 );

    }

osgQt::GLWidget* ViewerWidget::addViewWidget( osg::Camera* camera, osg::Group* scene )

{

osgViewer::View* view = new osgViewer::View;

        view->setCamera( camera );

        addView( view );

        

        view->setSceneData( scene );

        view->addEventHandler( new osgViewer::StatsHandler );

        view->setCameraManipulator( new osgGA::TrackballManipulator );

        

        gw = dynamic_cast<osgQt::GraphicsWindowQt*> ( camera->getGraphicsContext() ); 

        return gw ? gw->getGLWidget() : NULL;

}

osg::Camera* ViewerWidget::createCamera( int x, int y, int w, int h, const std::string& name, bool windowDecoration )

    {

        osg::DisplaySettings* ds = osg::DisplaySettings::instance().get();

        osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;

        traits->windowName = name;

        traits->windowDecoration = windowDecoration;

        traits->x = x;

        traits->y = y;

        traits->width = w;

        traits->height = h;

        traits->doubleBuffer = true;

        traits->alpha = ds->getMinimumNumAlphaBits();

        traits->stencil = ds->getMinimumNumStencilBits();

        traits->sampleBuffers = ds->getMultiSamples();

        traits->samples = ds->getNumMultiSamples();

        

        osg::ref_ptr<osg::Camera> camera = new osg::Camera;

        camera->setGraphicsContext( new osgQt::GraphicsWindowQt(traits.get()) );

        

        camera->setClearColor( osg::Vec4(0.2, 0.2, 0.6, 1.0) );

        camera->setViewport( new osg::Viewport(0, 0, traits->width, traits->height) );

        camera->setProjectionMatrixAsPerspective(

            30.0f, static_cast<double>(traits->width)/static_cast<double>(traits->height), 1.0f, 10000.0f );

        return camera.release();

 }

void ViewerWidget::paintEvent( QPaintEvent* event )

{

frame();

}

/////////////////////////////////////////////////////////////////////////////////

--

Thanks & Regards

Sujan

[Robert Milharcic]

On 8.5.2013 7:04, Sujan Dasmahapatra wrote:
> I am trying to implement a mouse press event with QT and OSG but
> unable to do it. Pls help.
>
> Below is my ViewerWidget class which is derived from QWidget and
> osg::CompositeViewer......In the constructor I got gView which is a
> osg::GLWidget, I am trying override mousePressEvent but when I click
> message not coming. What I am doing wrong pls help..
>

> [snip]

I don't know why this code didn't crash, I think it should. Anyway, you
should create an instance of the CSGraphicsView somewhere within
createCamera:

CSGraphicsView* gView = new CSGraphicsView;
gView->setGeometry(x, y, w, h);
traits->inheritedWindowData = new osgQt::GraphicsWindowQt::WindowData(
gView );

...
or you can pass an instance of the CSGraphicsView to the
osgQt::GraphicsWindowQt constructor.


Robert Milharcic
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[Sujan Dasmahapatra]

Thanks Robert. It is working fine...

On the left mouse press I am showing a message using QMessagBox. But on the middle mouse press was having pan and right mouse press was having zoom in zoom out. How can I retain those functionalities. With this these functionalities are gone. 

void CSGraphicsView::mousePressEvent(QMouseEvent *e)

{

if(e->button()==Qt::LeftButton) 

{

QMessageBox msg;

msg.setText("Mouse pressed");

msg.exec();

}

}

osg-users@lists.openscenegraph.org
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[Robert Milharcic]

On 8.5.2013 10:16, Sujan Dasmahapatra wrote:

Thanks Robert. It is working fine...

On the left mouse press I am showing a message using QMessagBox. But on the middle mouse press was having pan and right mouse press was having zoom in zoom out. How can I retain those functionalities. With this these functionalities are gone. 

void CSGraphicsView::mousePressEvent(QMouseEvent *e)

{

if(e->button()==Qt::LeftButton) 

{

QMessageBox msg;

msg.setText("Mouse pressed");

msg.exec();

}

}

Call base class implementation in a case where you need to retain original functionality:

void CSGraphicsView::mousePressEvent(QMouseEvent *e)

{

if(e->button()==Qt::LeftButton) 

{

QMessageBox msg;

msg.setText("Mouse pressed");

msg.exec();

}
        else
GLWidget::mousePressEvent(e);

}

Also, calling frame on paintEvent might not be enough. You should also call frame on every user input, on all mouse and keyboard events for example... or you can mount a QTimer and make it call frame at some interval.

Robert Milharcic

[Sujan Dasmahapatra]

Thats right Robert. Thanks a lot for your suggestions I appreciate it. Thanks Sujan

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