How to override a function QGraphicsScene::items()
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And why can't you simply call QGraphicsScene::items() in there?
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Hi,
Might be silly question but since you are not using any feature of QObject in your MoveItem why make it a QObject ?
If you really need that, there's already an existing class called QGraphicsObject.
Next, if your scene is only composed of your MoveItem, then you can go through the list and cast each pointer to the correct class and do whatever you need with it.
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@mikeeeeee
Hi
When using items(),
you just have to cast to your own type to use any function you defined.
(if cast dont fail, it IS your type)https://doc.qt.io/qt-5/qgraphicsitem.html#qgraphicsitem_cast
and please note it says
Reimplement the type() function
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As items() to cause my type?
I write such objects of the MoveItem class :
```
for (int i = 0; i< id1.size(); i++)
{
MoveItem *item = new MoveItem();
item->setPos(x1[i], y1[i]);
item->id = id1[i]; // set id
item->width = width1[i];
item->height = height1[i];
scene->addItem(item);
}Class MoveItem :class MoveItem : public QObject, public QGraphicsItem
{
Q_OBJECT
public:
explicit MoveItem(QObject *parent = 0);
~MoveItem();
int id;
int width, height;
QImage image;int getId() const; void setImageDark(int id);signals:
private:
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);public slots:
}; -
What text ?
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You really are not clear.
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@mikeeeeee You don't need to modify items() or QGraphicsScene to do what you want. If you add your custom items to the scene, they will be in the list of items returned. Just have some other function where you iterate through the pointers to items to do what you want with the ones that are the type you are looking for. It's a very normal use case, and modifying QGraphicsScene to have an unusual behavior for items() is only going to make your life difficult.
