Method setCentralWidget

src/3rdparty/Qt-Advanced-Docking-System/src/DockManager.cpp:1145–1179

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//============================================================================
CDockAreaWidget* CDockManager::setCentralWidget(CDockWidget* widget)
{
	if (!widget)
	{
		d->CentralWidget = nullptr;
		return nullptr;
	}

	// Setting a new central widget is now allowed if there is already a central
	// widget or if there are already other dock widgets
	if (d->CentralWidget)
	{
		qWarning("Setting a central widget not possible because there is already a central widget.");
		return nullptr;
	}

	// Setting a central widget is now allowed if there are already other
	// dock widgets.
	if (!d->DockWidgetsMap.isEmpty())
	{
		qWarning("Setting a central widget not possible - the central widget need to be the first "
			"dock widget that is added to the dock manager.");
		return nullptr;
	}


	widget->setFeature(CDockWidget::DockWidgetClosable, false);
	widget->setFeature(CDockWidget::DockWidgetMovable, false);
	widget->setFeature(CDockWidget::DockWidgetFloatable, false);
	widget->setFeature(CDockWidget::DockWidgetPinnable, false);
	d->CentralWidget = widget;
	CDockAreaWidget* CentralArea = addDockWidget(CenterDockWidgetArea, widget);
	CentralArea->setDockAreaFlag(CDockAreaWidget::eDockAreaFlag::HideSingleWidgetTitleBar, true);
	return CentralArea;
}

//============================================================================
QAction* CDockManager::addToggleViewActionToMenu(QAction* ToggleViewAction,