How to draw QGraphicsItem at the same location?

[Zikoel]

Hi,

I have the same problem. I have an Item that must stay always on top edge of an viewport. I want try whit a widget on my viewport but I have some problem.

void CMCanvasManager::createMenu(QWidget *canvas_parent)
{
	QWidget *w=new QWidget(canvas_parent, Qt::Popup | Qt::WindowStaysOnTopHint);
	w->setGeometry(100, 100, 100, 100);
	w->setMaximumSize(100,100);
	w->setMinimumSize(100,100);
	w->setFocusPolicy(Qt::NoFocus);
	w->show();
}

void CMCanvasManager::createMenu(QWidget *canvas_parent)
{
	QWidget *w=new QWidget(canvas_parent, Qt::Popup | Qt::WindowStaysOnTopHint);
	w->setGeometry(100, 100, 100, 100);
	w->setMaximumSize(100,100);
	w->setMinimumSize(100,100);
	w->setFocusPolicy(Qt::NoFocus);
	w->show();
}

To copy to clipboard, switch view to plain text mode 

Whit the code above I expect that my popup widget stay at 100,100 respect the parent geometry, but this does not happen. The widget appear at 100,100 respect the desktop, olso if I click on viewport the popup disappear. Any advice?

[wysota]

What is canvas_parent? And why are you setting those flags in the constructor?

[Zikoel]

canvas_parent is the widget that contain my custom QGraphicsView class, and I have set the flags in the costructo because I thought it was the best way to do it. I think that I have wrong all.
I am proceeding to attempts because I did not quite clear how the widgets work. Sorry.. Councils do what I described? Thank you!

[wysota]

canvas_parent is the widget that contain my custom QGraphicsView class

So how is this supposed to work? Do you understand the relationship between a widget and its parent?

I think that I have wrong all.

I think so too

I am proceeding to attempts because I did not quite clear how the widgets work. Sorry.. Councils do what I described? Thank you!

Looking at my earlier explanation, I write that you should position the widget on the viewport. To do that the widget needs to be a child of the viewport, not of an arbitrary widget.

If you have no idea about how things work, kindly please consider posting in the Newbie section and please be very explicit about what you are doing, it will save you a lot of time.

[Zikoel]

When I say "I am proceeding to attempts because I did not quite clear how the widgets work" I mean that I do not know the widget, but I work with Qt at least a year ;D.

I have modified the code in this mode:

void CMCanvas::createMenu(){
	m_menu_canvas=new QWidget();
	m_menu_canvas->setWindowFlags(Qt::Window | Qt::CustomizeWindowHint | Qt::WindowStaysOnTopHint);
	m_menu_canvas->setGeometry(100, 100, 100, 100);
	m_menu_canvas->setMaximumSize(100,100);
	m_menu_canvas->setMinimumSize(100,100);
	m_menu_canvas->show();
}
void CMCanvas::destroyMenu(){
	m_menu_canvas->close();
}

void CMCanvas::createMenu(){
	m_menu_canvas=new QWidget();
	m_menu_canvas->setWindowFlags(Qt::Window | Qt::CustomizeWindowHint | Qt::WindowStaysOnTopHint);
	m_menu_canvas->setGeometry(100, 100, 100, 100);
	m_menu_canvas->setMaximumSize(100,100);
	m_menu_canvas->setMinimumSize(100,100);
	m_menu_canvas->show();
}
void CMCanvas::destroyMenu(){
	m_menu_canvas->close();
}

To copy to clipboard, switch view to plain text mode 

The two metod is inside my custom class of QGraphicsView, but I do not know how to anchor the two windows.

[wysota]

Please get familiar with the concept or parent-child relationship between widgets. And I don't mean Qt but rather the GUI architecture currently used on desktop systems. So far you are trying to stack two top-level windows on top of each other which is unlikely to do what you want. Of course unless you want something else than what this thread is about.