Painting primitive elements-PanelMenu does not show

[MasterBLB]

Hi Brothers

Why the code below does not work?I mean,only the frame is painted.
parallelMenu is a descendant of QWidget.

void parallelMenu::paintEvent(QPaintEvent *e)
{
	QPainter p(this);
 
	QStyleOptionMenuItem menuOpt;
             menuOpt.initFrom(this);//the rect is set in the constructor by setGeometry
 
	QStyle *s=style();
 
	s->drawPrimitive(QStyle::PE_PanelMenu,&menuOpt,&p);
	s->drawPrimitive(QStyle::PE_FrameMenu,&menuOpt,&p);
}

void parallelMenu::paintEvent(QPaintEvent *e)
{
	QPainter p(this);

	QStyleOptionMenuItem menuOpt;
             menuOpt.initFrom(this);//the rect is set in the constructor by setGeometry

	QStyle *s=style();
	
	s->drawPrimitive(QStyle::PE_PanelMenu,&menuOpt,&p);
	s->drawPrimitive(QStyle::PE_FrameMenu,&menuOpt,&p);
}

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[wysota]

What is the exact effect you are trying to achieve?

[MasterBLB]

I'd like to create a popup menu with QAction laying in X parallel columns.
Unfortunetly,there is no such functionality in QMenu (except those when menu exceeds height of the screen,but I can't force to use it)

So I think there is no other way than create my own QParallelMenu from QWidget

[wysota]

I mean what is the reason for trying to perform those drawing operations.

[MasterBLB]

I want to draw menu using QStyle by using it's 'bricks':
http://doc.qt.nokia.com/4.6/style-reference.html#menus

But when I use drawPrimitive(QStyle::PE_PanelMenu,&menuOpt,&p); the panel is not drawn

[wysota]

QMenu itself only draws PE_PanelMenu and CE_MenuItems, it doesn't call PE_FrameMenu.

QStyleOptionMenuItem menuOpt;                                                                                                                             
menuOpt.initFrom(this);                                                                                                                            
menuOpt.state = QStyle::State_None;
menuOpt.checkType = QStyleOptionMenuItem::NotCheckable;
menuOpt.maxIconWidth = 0;
menuOpt.tabWidth = 0;
style()->drawPrimitive(QStyle::PE_PanelMenu, &menuOpt, &p, this);

QStyleOptionMenuItem menuOpt;                                                                                                                             
menuOpt.initFrom(this);                                                                                                                            
menuOpt.state = QStyle::State_None;
menuOpt.checkType = QStyleOptionMenuItem::NotCheckable;
menuOpt.maxIconWidth = 0;
menuOpt.tabWidth = 0;
style()->drawPrimitive(QStyle::PE_PanelMenu, &menuOpt, &p, this);

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[MasterBLB]

I tried this orginal QMenu code-it does not work.And about painting the frame-look down inside QMenu:aintEvent() :]

[wysota]

I tried this orginal QMenu code-it does not work.

What do you mean it doesn't work? Try surrounding the call with QPainter::save() and QPainter::restore().

[MasterBLB]

I mean that only the frame is visible,while I expected an plain,empty space.

[wysota]

Could you provide a mockup picture of what you wanted to obtain and what you did obtain?

[MasterBLB]

Sure,there is is.
As you can see,element QStyle::CE_MenuEmptyArea,as well as QStyle::PE_PanelMenu is not drawn-only the frame is visible.

Although I managed to develop a solution at least-I draw a large QStyle::CE_MenuItem without neither text nor icon,and then paint test items on it.
But still,I don't know why the orginal code does not work.

[wysota]

At least for me the image is not helpful in any way, you provided an image of the whole screen and I wanted two small pictures one of which points to what you get and the other to what you would like to get.

[MasterBLB]

Ok wysota,but in that case you have to wait 'till I come back from work to home.