[Qt-interest] QMainWindow stays below other windows on Windows

[John Weeks]

I haven't had much success with getting answers here; maybe I ask  
difficult questions or maybe I am too wordy. I'd be curious to know...  
When I get answers they are generally excellent.

Anyway, I am developing an application with the ability to switch from  
MDI mode to SDI mode, a la Qt Designer. One window is special and in  
SDI mode it is parented with a QMainWindow; the special compound  
widget is set as the central widget. Other (future document windows)  
are just plain QWidgets with the Window flag set.

On Macintosh, this works fine.

On Windows, it almost works fine, but the special QMainWidget window  
stays below the other windows even when it is the active window! I was  
wondering if anyone might have some insight into this problem- ideas  
of where to look for a solution.

I just noticed- on Windows, the whole application remains on top, even  
when another application (Visual Studio or Windows Explorer) is  
active! Is my problem some application setting?

I have pasted below the code that makes the switch, and creates the  
QMainWindow for the special window.

Thanks in advance!

Regards,
John Weeks

WaveMetrics, Inc.
Phone (503) 620-3001
Fax   (503) 620-6754
email   support at WaveMetrics.com

void IgorAppObject::initializeMDIstyle(bool doMDI, bool force)
{
	QList<windowInfo> WindowInfoList;

	if (!force)
	{
		if (doMDI == isMDI)
			return;
	}

	// IgorQtWindowGroup is a partial emulation of Macintosh window  
groups. It is not involved in
	// in the problem; the problem exists even when there are no groups  
instantiated.

	IgorQtWindowGroup::defilterForStateChange();
	if (!_IgorWindowList.isEmpty())			// list of all the document  
windows: these are derived
										// from QWidget
	{
		// gather information on position, etc., to be restored after app  
style switch
		for (int i = 0; i < _IgorWindowList.size(); ++i)
		{
			windowInfo wi;
			
			IgorWindow *w = _IgorWindowList[i];
			wi.isVisible = w->isVisible();
			wi.geometry = w->WMgetGeometry();
			wi.f = w->windowFlags();
			WindowInfoList.push_back(wi);
			w->setParent(0);
		}
	}

	// MDI mode is not a problem
	if (doMDI)
	{
		MDIParent = new QMainWindow(NULL);
		mdiArea = new QMdiArea(MDIParent);
		MDIParent->setCentralWidget(mdiArea);
		commandWindowDock = new QDockWidget(mdiArea);
		MLCommandWindow * commandWindow = getMLCommandWindow();
		QSize commandWindowSize = commandWindow->size();
		commandWindowDock->resize(commandWindowSize);
		commandWindow->setParent(commandWindowDock);
		commandWindowDock->setWidget(getMLCommandWindow());
		MDIParent->addDockWidget(Qt::BottomDockWidgetArea, commandWindowDock);
		MDIParent->show();

#ifndef Q_WS_MAC
		QMenuBar * mbar = IgorAppObject::getIgorMenuBar();
		mbar->setParent(0);
		MDIParent->setMenuBar(mbar);
		mbar->show();
#endif		

		delete commandWindowMain;
		commandWindowMain = NULL;

		isMDI = true;
		if (!_IgorWindowList.isEmpty())
		{
			for (int i = 0; i < _IgorWindowList.size(); ++i)
			{
				IgorWindow *w = _IgorWindowList[i];
				Qt::WindowFlags f = WindowInfoList[i].f;
				QMdiSubWindow *sw = mdiArea->addSubWindow(w, f);
				w->WMSetGeometry(WindowInfoList[i].geometry);
				sw->show();
			}
		}
	}
	else		// SDI mode exhibits the problem
	{
		// MLCommandWindow is the special window

		// make a QMainWindow for the MLCommandWindow to live in
		commandWindowMain = new QMainWindow(NULL);
		getMLCommandWindow()->setParent(commandWindowMain);
		commandWindowMain->setCentralWidget(getMLCommandWindow());
		commandWindowMain->show();

#ifndef Q_WS_MAC
		QMenuBar * mbar = IgorAppObject::getIgorMenuBar();
		mbar->setParent(0);
		commandWindowMain->setMenuBar(mbar);
		mbar->show();
#endif
		QWidget *tempMDIParent = MDIParent;

		// MDIParent is used as the parent widget for all document windows  
when in SDI mode
		MDIParent = commandWindowMain;


		delete tempMDIParent;

		isMDI = false;

		// restore document window characteristics
		if (!_IgorWindowList.isEmpty())
		{
			for (int i = 0; i < _IgorWindowList.size(); ++i)
			{
				IgorWindow *w = _IgorWindowList[i];
				w->setParent(MDIParent);
				Qt::WindowFlags f = WindowInfoList[i].f;
				f |= Qt::Window;
				w->setWindowFlags(f);
				QRect r = WindowInfoList[i].geometry;
				w->WMSetGeometry(r);
				if (WindowInfoList[i].isVisible)
					w->show();
			}
		}
	}
		
	IgorQtWindowGroup::refilterForStateChange();

	// this is code that I added trying to solve my problem. It makes no  
difference.
	if (commandWindowMain)
	{
		Qt::WindowFlags f = commandWindowMain->windowFlags();
		f |= (Qt::WindowStaysOnTopHint | Qt::CustomizeWindowHint);
		commandWindowMain->setWindowFlags(f);
		commandWindowMain->show();
		commandWindowMain->activateWindow();
	}
}

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