Drag in QGraphicsView

[ivanicy]

Hello!

I have a problem with my QGraphicsView object. I put an image inside it but the image is bigger than the QGraphicsView so, when I move the mouse over the image, the image moves too. I don't want this effect. It is like when I drag the image but without pressing it.

How can I fix it?

Thank you very much!

[SGaist]

Hi,

Do you mean when you move the item which contains that big image ?

Can you share the code you use ?

[ivanicy]

Yes, when I run the application, it has a QGraphicsView with an image. The problem is that I can move the image without doing drag, if I move the mouse over the image, I can move it, but this situation only should happen when I do drag on the image. I put the mouseTracking on because I need the image's coordinates.

I would share my code, but it is very long.

Thank you very much!!

[SGaist]

Can you show your code ?

[ivanicy]

@SGaist Ok, here is my code.

This is the constructor of my QGraphicsView class:

imageView::imageView(QWidget *parent)
{
    /* Inicialización de elementos gráficos **************************************** */
    scene = new QGraphicsScene();
    this->setScene(scene);
    //this->resize(788, 1044);

    item = new QGraphicsPixmapItem();

    scene->addItem(item);
    this->setMouseTracking(true);
    this->scene->setItemIndexMethod(QGraphicsScene::NoIndex);
    connect(scene, &QGraphicsScene::selectionChanged, this, &imageView::applySelection);
    //item->setFlag(QGraphicsPixmapItem::ItemIsMovable, false);
    //this->show();

    this->setCacheMode(CacheBackground);
    this->setViewportUpdateMode(BoundingRectViewportUpdate);
    this->setRenderHint(QPainter::Antialiasing);
    this->setTransformationAnchor(AnchorUnderMouse);
}

And this is my declaration code:

In *.h

QSharedPointer<imageView> thermalImage;

In *.cpp

thermalImage.reset(new imageView(this));
// Al connects...
ui->imageLayout->addWidget(thermalImage.data());

Thank you.

[SGaist]

Can you provide a complete minimal sample ?