[Solved] How correctly inherit from QGraphicsPixmapItem?
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Compiler show error:
C:\Qt\Examples\Qt-5.3\widgets\widgets\imageviewer\debug\moc_imageitem.cpp:71: ошибка: invalid static_cast from type 'QObject*' to type 'ImageItem*'
ImageItem *_t = static_cast<ImageItem *>(_o);What I do wrong?
"imageitem.h"
@#ifndef IMAGEITEM_H
#define IMAGEITEM_H#include <QGraphicsPixmapItem>
class ImageItem : public QGraphicsPixmapItem
{
Q_OBJECT
public:
ImageItem(QPixmap pixmap) : QGraphicsPixmapItem(pixmap){}public slots:
void changeVisibility(int state){
if(state == 0)hide();
else show();
}
void changeOpacity(int level){
setOpacity(level/10);
}
};#endif // IMAGEITEM_H@
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QGraphicsPixmapItem does not inherit QObject so macro Q_OBJECT is incorrect here. If you need it to be QObject too then you need to inherit QObject explicitly.
