Solved Remove QGraphicsTextItem from QGraphicsScene

[deleted396]

Hello! I am showing numbers with QGraphicsTextItem in a QGraphicsSene. Now i want to remove the last element of them.

I was thinking in storage every items in a QList<QGraphicsItem*>, get the last element and remove it with some function, but i am no be able to find that kind of function. Any suggerency?

[mrjj]

Hi
Like ?

QList<QGraphicsItem *> items = scene->Items();

and then with
http://doc.qt.io/qt-5/qlist.html#last
and
QGraphicsScene::removeItem(QGraphicsItem * item);
you might need to delete it yourself with
delete item;
check docs.

[deleted396]

@mrjj sorry but i think that in that way is not possible because I am using QGraphicsTextItem, no QGraphicsItem

[mrjj]

@AdrianCruz
Hi
The scene store items as base type (QGraphicsItem) .
Even they are also subclasses types. Like QGraphicsTextItem.
QGraphicsTextItem is also a QGraphicsItem.
So you can just cast them using
http://doc.qt.io/qt-5/qgraphicsitem.html#qgraphicsitem_cast
and if cast is ok (return is not null) then , its that type. and you can delete it.

[deleted396]

Finally, i did a cast how you said and now is working. Thanks so much!

[deleted396]

If someone has the same problem, i did:

QGraphicsItem *item = qgraphicsitem_cast<QGraphicsItem*>(text);
list.push_back(item);

list is a QList<QGraphicsItem*> list.

[mrjj]

@AdrianCruz
hi
Super :)
just as a note
To avoid getting possible NULLs in the list, i would suggest doing

QGraphicsItem *item = qgraphicsitem_cast<QGraphicsItem*>(text);
if (item)
list.push_back(item);