Add object to a scene from a sub class

[Andre008]

Hello,

i have create a dialog project with the Qt Creator which contains a code is as follows:


dialog.h:

class Dialog;
}
 
class Dialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
 
private:
    Ui::Dialog *ui;
 
    QGraphicsScene *scene;
 
    MemberClass mClass;
};

class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();

private:
    Ui::Dialog *ui;

    QGraphicsScene *scene;

    MemberClass mClass;
};

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dialog.cpp

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
 
    scene = new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);
}

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);

    scene = new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);
}

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From this point it is possible to add items with " scene->addItem(...)" to the scene.

How it is possible to add items to the scene from outside of the dialog class?

For Example:

memberClass.h

class MemberClass  
{
 
public:
   void addtoScene();
};

class MemberClass  
{

public:
   void addtoScene();
};

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memberClass.cpp

void MemberClass::addtoScene()
{
//Here an item should be add to the scene of the dialog class
}

void MemberClass::addtoScene()
{
//Here an item should be add to the scene of the dialog class
}

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Thx,
Andre

[anda_skoa]

You can either make the scene accessible, or you add "additem" methods to your dialog class and call those.

Cheers,
_

[Andre008]

ok, i got one solution, but i think it is not an elegant one.
The static construct helps in this point.

dialog.h

class Dialog;
}
 
class Dialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
 
private:
    Ui::Dialog *ui;
 
    static QGraphicsScene *scene;
 
    MemberClass mClass;
};

class Dialog;
}
 
class Dialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
 
private:
    Ui::Dialog *ui;
 
    static QGraphicsScene *scene;
 
    MemberClass mClass;
};

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dialog.cpp

QGraphicsScene* Dialog::scene = NULL;
 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
 
    scene = new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);
}

QGraphicsScene* Dialog::scene = NULL;

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
 
    scene = new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);
}

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MemberClass.cpp

void MemberClass::addtoScene()
{
     Dialog::scene->addItem(newItem);
}

void MemberClass::addtoScene()
{
     Dialog::scene->addItem(newItem);
}

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The problem is to get the the specific object of the dialog class.

[anda_skoa]

The problem is to get the the specific object of the dialog class.

Just pass the pointer of the dialog class or the pointer of the scene to the mClass object, e.g. in its constructor.

Cheers,
_

[Andre008]

Ok,t i got it,
Thx