c++ - 在我的类中声明的函数未显示在范围内

Question

在我的 .h 中:

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

在我的类文件中，我现在有两个函数:

#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);
}

但是我在 setSize 上遇到错误:

../IMViewer/imagepixmapitem.cpp:42: 错误: ‘setSize’ 未在此范围内声明

我在这里做错了什么？

Answer 1

void wheelEvent ( QGraphicsSceneWheelEvent * event ) 

应该说

void ImagePixmapItem::wheelEvent ( QGraphicsSceneWheelEvent * event )

并将其添加到 .h

protected:
    void wheelEvent ( QGraphicsSceneWheelEvent * event );