How to save/restore DockWidgets created in the course of an application?

Hello all,

Qt allows recovering the position and state of toolbars and QDockWidget using Qsettings. However, if you create in the course of an application a QDockWidget clicking a button and write the settings then, you can't restore the state of this QDockWidget. Can anyone give me a solution?

Qt code:

#include <QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

MainWindow mainWin;
mainWin.resize(800,600);
mainWin.show();

return app.exec();
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

class QAction;
class QListWidget;
class QMenu;
class QTextEdit;

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
MainWindow();

protected:
void closeEvent(QCloseEvent *event);

private slots:
void createDelayDockWindow();


private:
void createActions();
void createMenus();
void createToolBars();
void createStatusBar();
void createDockWindows();

void readSettings();
void writeSettings();


QListWidget *dockList;
QListWidget *delaydockList;


QMenu *fileMenu;
QMenu *editMenu;
QMenu *viewMenu;
QMenu *helpMenu;
QToolBar *fileToolBar;
QToolBar *editToolBar;

QAction *quitAct;

};


#endif

#include <QtGui>

#include "mainwindow.h"

MainWindow::MainWindow()
{
QWidget *window=new QWidget();
QVBoxLayout *vlayout= new QVBoxLayout;
QTextEdit *text1=new QTextEdit("Text1");
QPushButton *button1 = new QPushButton("New Dock Window");
connect(button1, SIGNAL(clicked()),this, SLOT(createDelayDockWindow()));

vlayout->addWidget(text1);
vlayout->addWidget(button1);
window->setLayout(vlayout);
setCentralWidget(window);

createActions();
createMenus();
createToolBars();
createStatusBar();
createDockWindows();

readSettings();

setWindowTitle(tr("Dock Widgets"));

}

void MainWindow::closeEvent(QCloseEvent *event)
{
writeSettings();

}

void MainWindow::createActions()
{
quitAct = new QAction(tr("&Quit"), this);
quitAct->setShortcuts(QKeySequence::Quit);
quitAct->setStatusTip(tr("Quit the application"));
connect(quitAct, SIGNAL(triggered()), this, SLOT(close()));

}

void MainWindow::createMenus()
{
fileMenu = menuBar()->addMenu(tr("&File"));

fileMenu->addAction(quitAct);

editMenu = menuBar()->addMenu(tr("&Edit"));


viewMenu = menuBar()->addMenu(tr("&View"));

menuBar()->addSeparator();

helpMenu = menuBar()->addMenu(tr("&Help"));

}

void MainWindow::createToolBars()
{
fileToolBar = addToolBar(tr("File"));
fileToolBar->addAction(quitAct);

editToolBar = addToolBar(tr("Edit"));

}


void MainWindow::createStatusBar()
{
statusBar()->showMessage(tr("Ready"));
}



void MainWindow::createDockWindows()
{
// DOCK WIDGET
QDockWidget *dock = new QDockWidget(tr("Dock1"), this);
dock->setObjectName(tr("Dock1"));
dockList = new QListWidget(dock);

dock->setWidget(dockList);
addDockWidget(Qt::RightDockWidgetArea, dock);
viewMenu->addAction(dock->toggleViewAction());

}

void MainWindow::createDelayDockWindow(){
// DELAYED DOCK WIDGET
QDockWidget *newdock = new QDockWidget(tr("Dock Delayed"), this);
newdock->setObjectName(tr("Dock Delayed"));
delaydockList = new QListWidget(newdock);
newdock->setWidget(delaydockList);

addDockWidget(Qt::TopDockWidgetArea, newdock);
newdock->setFloating(true);

viewMenu->addAction(newdock->toggleViewAction());

}

void MainWindow::writeSettings(){

QSettings settings("Test", "Test Dock Problem");
settings.setValue("MainWindow/State", saveState());

settings.setValue("MainWindow/Geometry", saveGeometry());
}


void MainWindow::readSettings(){
QSettings settings("Test", "Test Dock Problem");
restoreGeometry(settings.value("MainWindow/Geometry").toByteArray());
restoreState(settings.value("MainWindow/State").toByteArray());
}