Question

in my .h:

class ImagePixmapItem: public QGraphicsPixmapItem
    {
    public:
    void setSize(qreal size);
    private:
    qreal size;
};

In my class file I now have two functions:

#include "imagepixmapitem.h"
#include <QGraphicsSceneWheelEvent>

ImagePixmapItem::ImagePixmapItem(const QPixmap &pixmap, QGraphicsItem *parentItem)
: QGraphicsPixmapItem(pixmap,parentItem)
    {
    setCacheMode(NoCache);
    }

ImagePixmapItem::~ImagePixmapItem()
    {
    }

void ImagePixmapItem::setSize(qreal size)
    {
    this->size = size;
    }
void wheelEvent ( QGraphicsSceneWheelEvent * event ){
    qreal size = 1.2;
    if (event->delta() < 0)
      size = 1.0 / size;
    setSize(size);
}

yet I am getting an error on setSize:

../IMViewer/imagepixmapitem.cpp:42: error: ‘setSize’ was not declared in this scope

What am I doing wrong here?

Answer 1

void wheelEvent ( QGraphicsSceneWheelEvent * event ) 

should say

void ImagePixmapItem::wheelEvent ( QGraphicsSceneWheelEvent * event )

and also add this to the .h

protected:
    void wheelEvent ( QGraphicsSceneWheelEvent * event );