#include <QApplication>
#include <QGridLayout>
#include <QLabel>
#include <QLineEdit>
#include <QMainWindow>
#include <QPalette>

const int COL_SIZE	= 10;
const int ROW_SIZE	= 20;

void CreateGrid(QMainWindow* mainWindow)
{
	int columnCount = 12;
	int rowCount	= 5;
	
	mainWindow->setWindowTitle("Test Grid");
	// resizing mainWindow to at most its desired size (
	mainWindow->resize(columnCount * COL_SIZE, rowCount * ROW_SIZE);

	QWidget*		container	= new QWidget(mainWindow);
	container->resize(columnCount * COL_SIZE, rowCount * ROW_SIZE);
	
	QGridLayout*	gridLayout	= new QGridLayout(container);

	gridLayout->setHorizontalSpacing(0);
	gridLayout->setVerticalSpacing(0);

	for (int c = 0; c < columnCount; ++c) {
		gridLayout->setColumnMinimumWidth(c, COL_SIZE);
		gridLayout->setColumnStretch(c, 0);
	}
	for (int r = 0; r < rowCount; ++r) {
		gridLayout->setRowMinimumHeight(r, ROW_SIZE);
		gridLayout->setRowStretch(r, 0);
	}

	// Add an outer row/column that can resize freely
	gridLayout->setColumnMinimumWidth(columnCount, 0);
	gridLayout->setColumnStretch(columnCount, 1);
	gridLayout->setRowMinimumHeight(rowCount, 0);
	gridLayout->setRowStretch(rowCount, 1);

	
	QPalette	odd, even;
	odd.setColor(QPalette::Background, Qt::black);
	even.setColor(QPalette::Background, Qt::white);

	for (int c = 0; c < columnCount; ++c) {
		QWidget* square = new QWidget(container);
		square->setAutoFillBackground(true);
		square->setPalette((c + rowCount - 1) % 2 ? odd : even);
		gridLayout->addWidget(square, rowCount - 1, c);
	}
	for (int r = 0; r < rowCount; ++r) {
		QWidget* square = new QWidget(container);
		square->setAutoFillBackground(true);
		square->setPalette((columnCount - 1 + r) % 2 ? odd : even);
		gridLayout->addWidget(square, r, columnCount - 1);
	}

	QLabel*			field1		= new QLabel("somelabel", container);
	gridLayout->addWidget(field1, 0, 3, 1, 5);
	QLabel*			field2		= new QLabel("label", container);
	gridLayout->addWidget(field2, 1, 0, 1, 3);
	QLineEdit*		field3		= new QLineEdit("somelabel", container);
	gridLayout->addWidget(field3, 1, 4, 1, 6);
	QLabel*			field4		= new QLabel("label", container);
	gridLayout->addWidget(field4, 2, 0, 1, 3);

	QPalette	palette1;
	palette1.setColor(QPalette::Background, Qt::yellow);
	field1->setAutoFillBackground(true);
	field1->setPalette(palette1);
	QPalette	palette2;
	palette2.setColor(QPalette::Background, Qt::red);
	field2->setAutoFillBackground(true);
	field2->setPalette(palette2);
	QPalette	palette3;
	palette3.setColor(QPalette::Background, Qt::blue);
	field3->setAutoFillBackground(true);
	field3->setPalette(palette3);
	QPalette	palette4;
	palette4.setColor(QPalette::Background, Qt::green);
	field4->setAutoFillBackground(true);
	field4->setPalette(palette4);

	mainWindow->setCentralWidget(container);
}

int main(int argc, char** argv)
{
	QApplication	a(argc, argv);

	QMainWindow		mainWindow;

	CreateGrid(&mainWindow);
	mainWindow.show();

	return a.exec();
}