Stacks of transparent widgets and inputs passing through

Hello. I want to layer widgets in such a way that you can see through them and interact with all layers. The obvious thing seemed to be to subclass QStackedLayout and override the hiding behaviour. So I came up with this:

viewlayout.hpp:

Code:

---

class ViewLayout : public QStackedLayout {
	Q_OBJECT
public:
	ViewLayout (QWidget * =0);
 
	int addWidget (QWidget *);
	int insertWidget (int, QWidget *);
 
public slots:
	void setCurrentIndex (int);
	void setCurrentItem (QWidget *);
 
private:
	//! Shows everything in the widget.
	void show_all ();
};

---

viewlayout.cpp:

Code:

---

ViewLayout :: ViewLayout (QWidget * parent) : QStackedLayout(parent) {
}
 
int ViewLayout :: addWidget (QWidget * w) {
	int r = QStackedLayout :: addWidget (w);
	show_all ();
	return r;
}
 
int ViewLayout :: insertWidget (int i, QWidget * w) {
	int r = QStackedLayout :: insertWidget (i, w);
	show_all ();
	return r;
}
 
void ViewLayout :: setCurrentIndex (int) {
	// Do nothing. There is no notion of "current" item.
}
 
void ViewLayout :: setCurrentItem (QWidget *) {
	// Do nothing. There is no notion of "current" item.
}
 
void ViewLayout :: show_all () {
	for (int i=0; i<count(); i++) {
		itemAt(i)->widget()->raise();
		itemAt(i)->widget()->show();
	}
}

---

The widget that uses it:
view.hpp:

Code:

---

class View : public QWidget {
	Q_OBJECT
public:
	View (QWidget * =0);
 
	//! Remove the window from the view but do not destroy it.
	void removeWidget (QWidget *);
 
	//! \see QStackedLayout
	int addWidget (QWidget *);
 
	//! \see QStackedLayout
	int insertWidget (int, QWidget *);
 
	// \see QStackedLayout
	QWidget * widget (int) const;
};

---

view.cpp:

Code:

---

View :: View (QWidget * parent) : QWidget(parent) {
	ViewLayout * l = new ViewLayout ();
	setLayout(l);
}
 
void View :: removeWidget (QWidget * w) {
	layout() -> removeWidget (w);
}
 
int View :: addWidget (QWidget * w) {
	ViewLayout * l = dynamic_cast<ViewLayout *>(layout());
	return l -> addWidget (w);
}
 
int View :: insertWidget (int i, QWidget * w) {
	ViewLayout * l = dynamic_cast<ViewLayout *>(layout());
	return l -> insertWidget (i, w);
}
 
QWidget * View :: widget (int i) const {
	ViewLayout * l = dynamic_cast<ViewLayout *>(layout());
	return l -> widget (i);
}

---

And here's a demo window to put into such a stack.
bouncetest.hpp:

Code:

---

class BounceTest : public QFrame {
	Q_OBJECT
public:
	BounceTest (QWidget * =0);
 
private:
	QWidget * obj;
	int vx;
	int vy;
 
private slots:
	void timeOut();
};

---

bouncetest.cpp:

Code:

---

#include <stdlib.h>
 
namespace {unsigned int count = 0;}
 
BounceTest :: BounceTest (QWidget * parent) : QFrame(parent) {
	setFrameStyle(QFrame::Panel|QFrame::Plain);
	setLineWidth(3);
	QString s = "%1 %1 %1 %1\n%1 %1 %1 %1\n%1 %1 %1 %1\n%1 %1 %1 %1\n";
	obj = new QPushButton (s.arg(count++),this);
	obj->move(rand()%500,rand()%400);
	vx = 11;
	vy = 7;
	QTimer::singleShot(200,this,SLOT(timeOut()));
}
 
void BounceTest :: timeOut () {
	int X = obj->x();
	int Y = obj->y();
	int W = width();
	int H = height();
	int Wo= obj->width();
	int Ho= obj->height();
	if ((X+Wo)>W || X<0)
		vx = -vx;
	if ((Y+Ho)>H || Y<0)
		vy = -vy;
	obj->move (X+vx,Y+vy);
	QTimer::singleShot(150,this,SLOT(timeOut()));
}

---

And finally, main.cpp:

Code:

---

View * bt = new View ();
		bt->addWidget (new BounceTest());
		bt->addWidget (new BounceTest());
		bt->addWidget (new BounceTest());
		bt->addWidget (new BounceTest());
		bt->addWidget (new BounceTest());
	bt->resize(800,600);
	bt->show ();

---

At first glance, it seems okay except not all the Views have been resized.

Also, you can press the topmost button but none of the others. How do I rewrite BounceTest such that any click or mouse move not hitting any of its children wil propagate to the lower levels?

Thanks for reading this far.