connect qaction from menubar to a slot in a different class

hobbyProgrammer

I would like to connect a qAction to a slot that exists in a different class, but I don't seem to get it right.
I get the error QObject::connect: No such slot QGraphicsView::zoomIn() in ..

This is my code:

    GraphicsView *graphicsview = new GraphicsView;

    connect(ui->actionZoom_in, SIGNAL(triggered()), graphicsview, SLOT(zoomIn()));
    connect(ui->actionZoom_ou, SIGNAL(triggered()), graphicsview, SLOT(zoomOut()));

As you can see, I created my own QGraphicsView class called GraphicsView and this is the code for the zoomIn() and zoomOut() functions:

void GraphicsView::zoomIn()
{
    qDebug() << "Zoom in";
}

void GraphicsView::zoomOut()
{
    qDebug() << "Zoom out";
}

J.Hilk

@hobbyProgrammer
yep, Q_OBJECT is missing

class GraphicsView : public QGraphicsView
{
    Q_OBJECT
public:
    GraphicsView(QWidget *parent = 0);

public slots:
    void zoomIn();
    void zoomOut();
}

it is essential for Signal & Slots to work

J.Hilk

@hobbyProgrammer
can you show the header of GraphicsView class?

Probably a macro error/missing

hobbyProgrammer

@J-Hilk

#include <QGraphicsView>
#include <QDebug>

class GraphicsView : public QGraphicsView
{
public:
    GraphicsView(QWidget *parent = 0);

public slots:
    void zoomIn();
    void zoomOut();
}

J.Hilk

@hobbyProgrammer
yep, Q_OBJECT is missing

class GraphicsView : public QGraphicsView
{
    Q_OBJECT
public:
    GraphicsView(QWidget *parent = 0);

public slots:
    void zoomIn();
    void zoomOut();
}

it is essential for Signal & Slots to work

hobbyProgrammer

@J-Hilk okay but now I have a LNK2001 error. Saying "unresolved external symbol : public: virtual struct QMetaObject const*............"

J.Hilk

@hobbyProgrammer clean the build, and rerun qmake

hobbyProgrammer

@J-Hilk thank you so much for your time and effort! It works now :)

J.Hilk

No problem 😀

Make sure to set the topic to solved, by using the topic tools, thanks!