QGridLayout woes

[para]

I'm not exactly new to Qt, I've written 2-3 decent programs that use it before, but this is the first time I've used Qt4 and I'm having some basic layout problems.

I'm trying to create a single window with a 2x2 grid, where the top row is merged together and has a single push button titles "Top". The lower row should have one push button per cell, "Bottom-Left" and "Bottom-Right".

The problem is the top button does not appear to be expanding along both columns as it should. It also seems the QGridLayout is ignoring the second row -- while that row is being rendered, it overlaps the first and does not appear to be properly spaced.

Has the method of doing this changed since Qt3?

Here's the code:

#include <qapplication.h>
 
#include <qwidget.h>
#include <qpushbutton.h>
#include <qgridlayout.h>
 
class gui : public QWidget {
	Q_OBJECT
 
	public:
		gui();
 
	private:
		QPushButton* pb;
		QPushButton* pb1;
		QPushButton* pb2;
 
		QGridLayout* base;
};
 
gui::gui() {
	base = new QGridLayout(this);
 
	pb = new QPushButton("Top");
	pb1 = new QPushButton("Bottom-Left");
	pb2 = new QPushButton("Bottom-Right");
 
	base->addWidget(pb1, 1, 0);
	base->addWidget(pb2, 1, 1);
	base->addWidget(pb, 0, 0, 0, 1);
}
 
int main(int argc, char** argv) {
 
	QApplication app(argc, argv);
 
 
 
	gui* w = new gui();
 
 
 
	w->show();
 
 
 
	app.exec();
 
 
 
	delete w;
 
	return 0;
 
}

#include <qapplication.h>

#include <qwidget.h>
#include <qpushbutton.h>
#include <qgridlayout.h>

class gui : public QWidget {
	Q_OBJECT

	public:
		gui();

	private:
		QPushButton* pb;
		QPushButton* pb1;
		QPushButton* pb2;

		QGridLayout* base;
};

gui::gui() {
	base = new QGridLayout(this);
	
	pb = new QPushButton("Top");
	pb1 = new QPushButton("Bottom-Left");
	pb2 = new QPushButton("Bottom-Right");

	base->addWidget(pb1, 1, 0);
	base->addWidget(pb2, 1, 1);
	base->addWidget(pb, 0, 0, 0, 1);
}

int main(int argc, char** argv) {

	QApplication app(argc, argv);

	

	gui* w = new gui();

	

	w->show();

	

	app.exec();

	

	delete w;

	return 0;

}

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Thanks.

[jacek]

base->addWidget(pb, 0, 0, 0, 1);

It works with "base->addWidget(pb, 0, 0, 1, 0);". It looks like rowSpan and columnSpan parameters are switched.

[para]

I can't believe I didn't notice that! Thanks a lot.
I seem to remember Qt3's parameters being (fromRow, toRow, FromCol, toCol) -- really had me stumped.

[jacek]

I seem to remember Qt3's parameters being (fromRow, toRow, FromCol, toCol)

In Qt4 they are (fromRow, fromCol, rowSpan, colSpan), so actually it should be:

base->addWidget(pb, 0, 0, 1, 2)

base->addWidget(pb, 0, 0, 1, 2)

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