QWidget and addanchor?

SPlatten

Is there something wrong with the information on this page?
https://doc.qt.io/qt-6/qtwidgets-graphicsview-simpleanchorlayout-example.html

Because I am trying to add a widget and I get the error message:

error: Cannot initialize a parameter of type 'QGraphicsLayoutItem *' with an lvalue of type 'QWidget *'

However looking again, its not a QWidget at all, its defined as Widget.

What I am trying to do is add anchor functionality to my widgets, is this possible ?

JoeCFD

@SPlatten
Look at the source code here:
https://code.qt.io/cgit/qt/qtbase.git/tree/examples/widgets/graphicsview/simpleanchorlayout/main.cpp?h=6.6

class Widget : public QGraphicsWidget
{
public:
   Widget(const QColor &color, const QColor &textColor, const QString &caption,
          QGraphicsItem *parent = nullptr)
       : QGraphicsWidget(parent)
       , caption(caption)
       , color(color)
       , textColor(textColor)
   {
   }

   void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget * = nullptr) override
   {
       QFont font;
       font.setPixelSize(0.75 * qMin(boundingRect().width(), boundingRect().height()));

       painter->fillRect(boundingRect(), color);
       painter->save();
       painter->setFont(font);
       painter->setPen(textColor);
       painter->drawText(boundingRect(), Qt::AlignCenter, caption);
       painter->restore();
   }

private:
   QString caption;
   QColor color;
   QColor textColor;
};

SPlatten

@JoeCFD said in QWidget and addanchor?:

https://code.qt.io/cgit/qt/qtbase.git/tree/examples/widgets/graphicsview/simpleanchorlayout/main.cpp?h=6.6

Thank you, however it doesn't look it supports regular QWidgets, If I want to add a QPushButton with anchors can that be done with this code?

JoeCFD

@SPlatten Are you trying to add a widget on top of a scene graph?
If yes, check here out
https://forum.qt.io/topic/71151/adding-a-qwidget-to-a-qgraphicsscene-clearing-it-then-adding-the-qwidget-again/7

SPlatten

@JoeCFD said in QWidget and addanchor?:

https://forum.qt.io/topic/71151/adding-a-qwidget-to-a-qgraphicsscene-clearing-it-then-adding-the-qwidget-again/7

What I am trying to do is add the capability for any widgets to be added to any layout with any anchors.

I believe I can write my own implementation.

SGaist

@SPlatten hi,

You can add a widget to a QGraphicsScene and you get a QGraphicsProxyWidget that you can then add to your layout.