How to get a return value from QUndoCommand::redo?

[wayfaerer]

I'm using a custom QGraphicsScene in which you can click to create a custom QGraphicsItem, then drag (with the mouse still held down) to resize it. To do this, overrode QGraphicsItem::mousePressEvent and mouseMoveEvent, and it worked fine. It was something like this:

MyScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    itemBeingCreated = new MyItem(event->pos()) // "itemBeingCreated" is declared in myscene.h
}
 
MyScene::mouseMoveEvent(QGraphicsMouseEvent *event)
{
    itemBeingCreated->resize(/* etc */) // basically how far you drag it from its origin, that's how big it'll be
}

MyScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    itemBeingCreated = new MyItem(event->pos()) // "itemBeingCreated" is declared in myscene.h
}

MyScene::mouseMoveEvent(QGraphicsMouseEvent *event)
{
    itemBeingCreated->resize(/* etc */) // basically how far you drag it from its origin, that's how big it'll be
}

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Now I am trying to add undo/redo capability with QUndoStack and QUndoCommand. So now my mousePressEvent does this

MyScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    undoStack->push(new AddNewItem(/* etc */)); // "AddNewItem" is a QUndoCommand
}

MyScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    undoStack->push(new AddNewItem(/* etc */)); // "AddNewItem" is a QUndoCommand
}

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But I don't understand how I can access the item created by "AddNewItem" in order to resize it in MyScene:nMouseMove. Should I just implement a "QGraphicsItem *AddNewItem::getCreatedItem()", or will that "break" the command pattern and lead to problems?