QGraphicsItem selection

Question

Does a simple method exist to select part of a QGraphicsItem (like for a selection, with a dashed border for example), despite its position in the QGraphicsScene

I've found QGraphicsItem::ItemIsSelectable but it doesn't help me much.

Thx

Answer 1

You can't select a part of QGraphicsItem. You can select whole item. Usualy it will draw a dashed rectangle around itself when selected.

You can select item by:

QGraphicsItem::setSelected

or

QGraphicsScene::setSelectionArea

Answer 2

Do you want to select it when you're clicking on it? If yes, you can override the mousePressEvent(QGraphicsSceneMouseEvent event) listener for this item, and use setSelected(). In Java (sorry about it), it would be something like:

@Override
public void mousePressEvent (QGraphicsSceneMouseEvent event) {
    if (event.button() == Qt.MouseButton.LeftButton) {
        this.setSelected(true);
    }
}

If you want to select it with a left button of course. :)