QWidget/QGlwidget ( + window opacity )

Hi Everybody

I have a graphics scene and I need to have some controls on top of it( like buttons ).
This buttons should be static/unmoved while scene scaled, moved, rotated and so on.
So it seems I can not use any kind of graphicitems.

So I decided to create subclass of QWidget

Code:

---

#include <QPixmap>
#include <QGLWidget>
 
class CLStaticImageWidget : public QGLWidget 
{
	Q_OBJECT
public:
	CLStaticImageWidget(QWidget *parent, QString img, QString name, int max_width);
signals:
	void onPressed(QString name);
protected:
	void paintEvent(QPaintEvent *event);
protected:
	QPixmap m_img;
	QString m_name;
 
	int m_width;
	int m_height;
 
};

---

and cpp file

Code:

---

CLStaticImageWidget::CLStaticImageWidget(QWidget *parent, QString img, QString name, int max_width):
QGLWidget(parent,0)//, Qt::Window)
{
	hide();
	m_img = cached(img);
 
	int w = m_img.width();
	int h = m_img.height();
 
	qreal apect = (qreal)w/h;
 
	m_width = max_width;
	m_height = max_width/apect;
 
	QSize size(m_width, m_height);
 
	setMaximumSize(size);
	setMinimumSize(size);
 
	setWindowOpacity(0.5); // here is an issue 
 
 
 
}
 
void CLStaticImageWidget::paintEvent(QPaintEvent *event)
{
	QPainter painter(this);
	painter.drawPixmap(QRect(0,0,m_width,m_height), m_img, m_img.rect());
	painter.end();
}

---

and I add it to the scene inside my graphicsview like this

Code:

---

CLStaticImageWidget * wgt = new CLStaticImageWidget(this, "./skin/home.bmp", "home", 100);
			wgt->move(1,1);
			wgt->show();

---

So, it works fine except two issues

1) setWindowOpacity does not work. But if widget has flag Qt::Window it works.
Is there any way I can make widget transperent and do not have this Qt::Window flag.

2) If i replace QWidget with QGLWidget and add widget it first dwaws some garbage for a moment(may be something look like part of my desctop or so) and after that works fine.


Any ideas?
Thank you!