dockmanager savesate only save the layout of first dock area

[BarryArch]

I want to save the dock layout to a file and reload it when reopen.
the code of save dock layout :

    QFile file("VisualLayout.ini");
	if (file.open(QIODevice::WriteOnly))
	{
		QDataStream out(&file);
		out << _dockMan->saveState();
		file.close();
	}

and the code of load the config file:

 QFile file("VisualLayout.ini");
	if (file.open(QIODevice::ReadOnly))
	{
		QByteArray ba;
		QDataStream in(&file);
		in >> ba;
		file.close();
        
		if (_dockMan->restoreState(ba))
		{
			qDebug() << QString("good");
		}
		else
		{
			qDebug() << QString("failed");
		}
	}

but it just reload the 1st dock area layout, and totally ignored other dock area.

[githubuser0xFFFF]

Please have a look into the demo application to learn how to save and restore dock manager states.

[BarryArch]

I have learned from the demo application, and modified the code like :

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
 // .... 
    restoreSettings();

}

MainWindow::~MainWindow()
{

}

void MainWindow::closeEvent(QCloseEvent * event)
{
	saveSettings();
    _dockMan->deleteLater();
	QMainWindow::closeEvent(event);
}


void MainWindow::saveSettings()
{
    QSettings settings("Settings.ini", QSettings::IniFormat);
    settings.setValue("mainWindow/Geometry", saveGeometry());
	settings.setValue("mainWindow/State", saveState());
	settings.setValue("mainWindow/DockingState", _dockMan->saveState());
}


void MainWindow::restoreSettings()
{
    QSettings settings("Settings.ini", QSettings::IniFormat);
    restoreGeometry(settings.value("mainWindow/Geometry").toByteArray());
	restoreState(settings.value("mainWindow/State").toByteArray());
	_dockMan->restoreState(settings.value("mainWindow/DockingState").toByteArray());
}

But it just doesn't work , dockmanager savesate still only save the layout of first dock area. Is there any key point that I have overlooked here? I really need your help .

[githubuser0xFFFF]

Does save and restore work in the demo application?

[BarryArch]

Indeed, your demo program is functioning very well. However, I feel that my method of usage has been correct and in line with your demo program. Is there perhaps some key aspect that I might have overlooked?

[BarryArch]

DockWidget must have a widget set in order to be reloaded from configuration. This note is recorded here for anyone who might encounter the same issue.