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#include <QtGui>

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow()
{

QTextEdit *edit1 = new QTextEdit(this);
setCentralWidget(edit1);

QDockWidget *topDock = new QDockWidget(this);
topDock->setObjectName("Top dock");
topDock->setWidget(new QLineEdit("Top dock", topDock));
addDockWidget(Qt::TopDockWidgetArea, topDock);

dock1 = new QDockWidget(this);
dock1->setObjectName("Dock 1");
dock1->setWidget(new QLineEdit("First dock", dock1));
dock2 = new QDockWidget(this);
dock2->setObjectName("Dock 2");
dock2->setWidget(new QPushButton("Second dock", dock2));

addDockWidget(Qt::BottomDockWidgetArea, dock1);
addDockWidget(Qt::BottomDockWidgetArea, dock2, Qt::Vertical);
QTimer timer = new QTimer(this);
timer->start(3000);
connect(timer, SIGNAL(timeout()), this, SLOT(testSlot()));
dockList = findChildren<QDockWidget>();

}
public slots:
void testSlot()
{
for (int i = 0; i < dockList.count(); i++) {
QDockWidget *dock = dockList.at(i);

int dockTopLeft = dock->geometry().topLeft().y();
int  centralWidBottom = centralWidget()->geometry().bottomLeft().y();
int offset = dockTopLeft  - centralWidBottom;

if (dockWidgetArea(dock) == Qt::BottomDockWidgetArea && dock->geometry().bottomLeft().x() == 0 && offset < 10) {
 qDebug() << dock->objectName() << " is first in the bottom dock area";
}

}}

private:
QDockWidget *dock1;
QDockWidget dock2;
QList<QDockWidget> dockList;

};

#include "main.moc"
int main(int argc, char** argv)
{
QApplication app(argc, argv);
MainWindow window;
window.show();
return app.exec();

}
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