Problem with GUIs

[trallallero]

I have a class derived from QGraphicsView that creates a GUI only if created by the main.
So, this works:

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
 
	QGraphicsScene scene;
	scene.setSceneRect(0, 0, 1024, 768);
	scene.setBackgroundBrush(QColor::fromRgb(47, 51, 47));
 
	gui view(&scene);
	view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	view.setWindowFlags(Qt::FramelessWindowHint) ;
	view.setCacheMode(QGraphicsView::CacheBackground);
	view.setDragMode(QGraphicsView::NoDrag);
	view.setFixedSize(1024, 768);
	view.show();
 
	return a.exec();
}

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);

	QGraphicsScene scene;
	scene.setSceneRect(0, 0, 1024, 768);
	scene.setBackgroundBrush(QColor::fromRgb(47, 51, 47));

	gui view(&scene);
	view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	view.setWindowFlags(Qt::FramelessWindowHint) ;
	view.setCacheMode(QGraphicsView::CacheBackground);
	view.setDragMode(QGraphicsView::NoDrag);
	view.setFixedSize(1024, 768);
	view.show();

	return a.exec();
}

To copy to clipboard, switch view to plain text mode 

And this doesn't work:

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	Starter s;
	return a.exec();
}

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	Starter s;
	return a.exec();
}

To copy to clipboard, switch view to plain text mode 

class Starter : public QObject
{
	Q_OBJECT
 
	public:
		Starter();
};

class Starter : public QObject
{
	Q_OBJECT

	public:
		Starter();
};

To copy to clipboard, switch view to plain text mode 

Starter::Starter()
{
	QGraphicsScene s;
	s.setSceneRect(0, 0, 1024, 768);
	s.setBackgroundBrush(QColor::fromRgb(47, 51, 47));
 
	gui view(&s);
 
	view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	view.setWindowFlags(Qt::FramelessWindowHint) ;
	view.setCacheMode(QGraphicsView::CacheBackground);
	view.setDragMode(QGraphicsView::NoDrag);
	view.setFixedSize(1024, 768);
	view.show();
}

Starter::Starter()
{
	QGraphicsScene s;
	s.setSceneRect(0, 0, 1024, 768);
	s.setBackgroundBrush(QColor::fromRgb(47, 51, 47));

	gui view(&s);

	view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	view.setWindowFlags(Qt::FramelessWindowHint) ;
	view.setCacheMode(QGraphicsView::CacheBackground);
	view.setDragMode(QGraphicsView::NoDrag);
	view.setFixedSize(1024, 768);
	view.show();
}

To copy to clipboard, switch view to plain text mode 

Why ?

The main problem is that I need a GUI with an empty constructor as my main application will load a plugin (the GUI) that will create a GUI based on a QGraphicsScene.
So the Starter could create the QGraphicsScene and pass it to the gui class, but it doesn't work.

[mcosta]

IN the constructor of Starter you declare s into the
stack.
When the constructor exits, this instance is destroyed and
then your scene doesn't exists.

Try declaring s as member of Starter

[trallallero]

Thanks but no, doesn't work

[mcosta]

Sorry,

also the gui instance is destroyed when Starter constructor exits.
Then, also the gui instance must be a Starter Member

[trallallero]

Sorry,

also the gui instance is destroyed when Starter constructor exits.
Then, also the gui instance must be a Starter Member

Yes of course, I've seen it and I've just corrected it and it works.

Thanks a lot