How to add a graphicsrectitem to a graphicslayout?

StudentScripter

Can't find much information on how to achieve that, so any hint is appreciated. :D
My goal is to have all items in a layout with adjustable margins between the items. The graphicsitems themself should still be scalable in height if the layout is horizontal and scalable in width if the layout is vertical.

        // Erstellen Sie ein QGraphicsWidget
        QGraphicsWidget *widget = new QGraphicsWidget();
        widget->setFlag(QGraphicsItem::ItemIsMovable);
        QGraphicsWidget *item1 = new QGraphicsWidget;
        item1->setAutoFillBackground(true);

        QGraphicsWidget *item2 = new QGraphicsWidget;
        item2->setAutoFillBackground(true);
        // Erstellen Sie ein Layout
        
        QGraphicsRectItem *RectItem = new QGraphicsRectItem();
        QGraphicsLinearLayout *layout = new QGraphicsLinearLayout();
        
        


        layout->addItem(item1);
        layout->addItem(RectItem);
        layout->addItem(item2);

          layout->setSpacing(50);
         layout->setOrientation(Qt::Vertical);
        // Setzen Sie das Layout für das Widget
        widget->setLayout(layout);

        // Fügen Sie das Widget zur Szene hinzu
        addItem(widget);

Pl45m4

@StudentScripter

Read what's written here

https://doc.qt.io/qt-6/qgraphicslinearlayout.html#qgraphicslinearlayout-compared-to-other-layouts

QGraphicsLayout is for QGraphicsWidgets, not QGraphicsItems.

JonB

@StudentScripter
As @Pl45m4 has written. Which means I don't understand how you got the following through the compiler:

QGraphicsLinearLayout *layout = new QGraphicsLinearLayout();
QGraphicsRectItem *RectItem = new QGraphicsRectItem();
layout->addItem(RectItem);

? If this generated a compiler error you would surely have said so, no?

StudentScripter

@Pl45m4 But isn't there anyway to create layouts for graphicsitems?

Pl45m4

@StudentScripter

This example shows how a use case could look like

https://doc.qt.io/qt-6/qtwidgets-graphicsview-basicgraphicslayouts-example.html

But as you can see, the custom items inherit from QGraphicsLayoutItem and QGraphicsItem.
So to properly use a QGraphicsItem in a layout, you have to inherit QGraphicsLayoutItem or use QGraphicsWidget directly... however I don't know how it fits in your existing logic/structure. It might break something... using layouts and "moving free / free resizable by user" is kinda counterproductive.