Mouse controls over Qt 3D Window

dsell002

I have a QWidget containing a Qt3DWindow(). I'd like to be able to "zoom" in and out on a QtEntity, within the Qt3DWindow, using the mouse scroll wheel, while hovering over the window.

I have the functionality working, but only when hovering the mouse outside of the Qt3DWindow frame. Here's my code for initializing the window and processing mouse wheel events.

Window Initialization:

mainView = new Qt3DExtras::Qt3DWindow();
mainView->defaultFramegraph()->setClearColor(QColor(QRgb(0x4d4d4f)));

QWidget *container = QWidget::createWindowContainer(mainView);

Processing wheel events:

void ModelView::wheelEvent(QWheelEvent *event){

    QVector3D vec;

    vec = cameraEntity->position() - modifier->m_transform->translation();

    vec = vec.normalized();

    QPoint delta = event->angleDelta();

    int zoom_distance = delta.y()*0.01;

    vec = cameraEntity->position() - zoom_distance*vec;

    cameraEntity->setPosition(vec);
}

What's the trick for overriding the window's mouse grab when hovering over the Qt3DWindow frame?

Thanks in advance for any help.

kshegunov

You need a mouse controller in Qt3D, not an override of the view's mouse handling routines. Take a look at the Qt3DInput's module docs, for example here's a place to start.

dsell002

@kshegunov I ended up using an event filter to catch the mouse wheel events over the window.

    mainView = new Qt3DExtras::Qt3DWindow();
    mainView->defaultFramegraph()->setClearColor(QColor(QRgb(0x4d4d4f)));

    mainView->installEventFilter(this);

bool ModelView::eventFilter(QObject *obj, QEvent *event)
{
    switch(event->type())
    {
    case QEvent::KeyPress:
    {
        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
        return true;
    }
        break;
    case QEvent::Wheel:
    {
        QWheelEvent *wheelEvent = static_cast<QWheelEvent *>(event);

        QVector3D vec;

        vec = cameraEntity->position() - modifier->m_transform->translation();

        vec = vec.normalized();

        QPoint delta = wheelEvent->angleDelta();

        int zoom_distance = delta.y()*0.01;

        vec = cameraEntity->position() - zoom_distance*vec;

        cameraEntity->setPosition(vec);
        return true;
    }
        break;
    default:
        // standard event processing
        return QObject::eventFilter(obj, event);
        break;

    }

}

Saitodepaula

I've posted a similar question here: https://forum.qt.io/topic/92804/simplest-way-to-get-mouse-events-on-qt3dwindow

Could any of you help?