When QGraphicsScene empty space in the Scene ?

Pada_

Is there a way to prevent QGraphicsScene from selecting previously selected items when I click the control after multiple selection and click on empty space in the Scene?

dheerendra

Can you help us with sample program & behaviour you are expecting ? This helps the forum team to help you.

Pada_

@dheerendra

If you select one or more items in QGraphicsView and then hold down the Ctrl key on the keyboard and click on an empty space in the GraphicsView, will the selected items be initialized and can be resolved?

mrjj

Hi
Normally when you click on empty space while holding down CTRL, nothing will happen.
However, if you do not hold CTRL down and click on empty space, the selection will
be cleared.
Is that what you want to remove? So selection stays even if user click on empty space ?

Pada_

@mrjj
Yes. Hopefully the previously selected items will be retained when the user presses the Ctrl key on the key squeeze, clicks on an empty space, or drags and drops on an empty space to create the region.

mrjj

@Pada_

Hi
You can do something like

void MyScene::mousePressEvent (QGraphicsSceneMouseEvent *mouseEvent)
{
   // if left mouse pressed  and there is items under the mouse pos.
    if ((mouseEvent->buttons () & Qt::LeftButton) && items (mouseEvent->scenePos ()).count()) {
        QGraphicsScene::mousePressEvent (mouseEvent);
    } else {
        mouseEvent->accept (); // eat event
    }
}

Pada_

@mrjj
If you do, the rubber band will not be created with an empty space click drag drop!

mrjj

@Pada_
Hmm, you have to use a variable to know you are rubberband and and include in check.