foreach: invalid conversion from 'QGraphicsItem*' to 'QGraphicsItemGroup* - c++

Question

I am implementing copy operation in graphicsView for different entities such as point, ellipse, circle etc. in qt but getting an error
error: invalid conversion from 'QGraphicsItem*' to 'QGraphicsItemGroup*
My code to copy operation in cadgraphicsview.cpp is:
void CadGraphicsScene::copy()
{
selectedItems.clear();
foreach(QGraphicsItemGroup *item, itemList){
QString str;
if (item->isSelected())
{
if(item->type() == Point::Type)
{
Point *pointItem = (Point *) item;
str = QString("Point %1 %2 ")
.arg(pointItem->scenePos().x())
.arg(pointItem->scenePos().y());
}
}
}
}
In cadgraphicsscene.h
#ifndef CADGRAPHICSSCENE_H
#define CADGRAPHICSSCENE_H
#include <QGraphicsScene>
#include <QXmlStreamWriter>
#include <QUndoStack>
#include <QLabel>
#include <QFrame>
#include "cadcommandadd.h"
#include "cadcommanddelete.h"
#include "cadcommandmove.h"
class CadGraphicsScene : public QGraphicsScene
{
Q_OBJECT
public:
explicit CadGraphicsScene(QObject *parent, QUndoStack *);
enum Mode { NoMode, PointMode, LineMode, CircleMode, EllipseMode, TextMode };
QFont font() const
{
return myFont;
}
QColor textColor() const
{
return myTextColor;
}
void setTextColor(const QColor &color);
void setFont(const QFont &font);
void deleteItems();
void writeStream(QXmlStreamWriter *stream);
void readStream(QXmlStreamReader *stream);
public slots:
void setMode(Mode mode);
void selectItems();
void editorLostFocus(mText *item);
void cut();
void copy();
void paste();
void del();
protected:
void contentsContextMenuEvent(QContextMenuEvent *event);
void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);
void setFlags();
void areItemsSelectable(bool);
void dragEnterEvent(QDragEnterEvent *event);
void dropEvent(QDropEvent *event);
void mousePressEvent(QMouseEvent *event);
signals:
void textInserted(QGraphicsTextItem *item);
void itemSelected(QGraphicsItem *item);
private:
Mode entityMode;
QUndoStack *mUndoStack;
bool mFirstClick;
bool mSecondClick;
bool mThirdClick;
bool mPaintFlag;
QVector<QPointF> stuff;
QPointF start_p, mid_p, end_p, move_p, check_p;
QPen paintpen, linePen;
QList<QGraphicsItem *> itemList;
Point *pointItem;
Line *lineItem;
Circle *circleItem;
Ellipse *ellipseItem;
mText *textItem;
QColor myTextColor;
QFont myFont;
typedef QPair<QGraphicsItem *, QPointF> itemPos;
QList<itemPos> selectedItems;
private:
QAction *cutAct;
QAction *copyAct;
QAction *pasteAct;
};
#endif // CADGRAPHICSSCENE_H
Help me out to sought this :)

Answer 1

You define itemList as:
QList<QGraphicsItem *> itemList;
You are then trying to iterate it with:
foreach(QGraphicsItemGroup *item, itemList){
// ...
}
From the documentation you can see that QGraphicsItemGroup inherits from QGraphicsItem. So every QGraphicsItemGroup "is a" QGraphicsItem. But not every QGraphicsItem "is a" QGraphicsItemGroup.
If you want to iterate that itemList then item will have to be a QGraphicsItem, or itemList will have to be a QGraphicsItemGroup. It seems that since you are testing for specific classes then the former is probably what you want.