get QMdiSubWindow Pointer of Current SubWindow

I have the following class which makes it easy for me to get new mdi sub windows

Code:

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#ifndef MDICHILD_H_
#define MDICHILD_H_
 
#include <QtGui/QMdiArea>
#include <QtCore/QString>
#include <QtGui/QDialog>
#include <QtGui/QMdiSubWindow>
 
extern QMdiArea * MainWindowMdiArea;
 
class MdiChild : public QDialog
{
	Q_OBJECT
public:
	MdiChild(QWidget* parent = 0, Qt::WFlags flags = 0);
	virtual ~MdiChild();
 
public:
	void setDescription(const QString & str);
	QString Description();
	void makeMDIChild(QWidget * widget);
 
private:
	QString m_description;
	QWidget * InternalWidget;
 
};
#endif

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Code:

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#include "MdiChild.h"
 
QMdiArea * MainWindowMdiArea;
 
MdiChild::MdiChild(QWidget* parent, Qt::WFlags flags /*= 0*/) 
	: QDialog(parent , Qt::SubWindow | Qt::WindowMinMaxButtonsHint ) 
{		
	setAttribute(Qt::WA_DeleteOnClose);
}
 
MdiChild::~MdiChild()
{	
}
 
void MdiChild::setDescription(const QString & str)
{
	m_description = str;
}
 
QString MdiChild::Description()
{
	return m_description;
}
 
void MdiChild::makeMDIChild(QWidget * widget)
{
	setDescription(widget->windowTitle());
	QMdiSubWindow * win = MainWindowMdiArea->addSubWindow(widget);
	InternalWidget = widget;
	connect(widget, SIGNAL(destroyed()), win, SLOT(close()));    
}

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which can be used as

Code:

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MainWindow::MainWindow(QWidget* parent /*= 0*/, Qt::WFlags flags /*= 0*/) 
	: QMainWindow(parent , Qt::Window) 
{	
	setupUi(this);
	MainWindowMdiArea = mdiArea;
...

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Code:

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#include "MdiChild.h"
 
class DialogRotationStageStanda : public MdiChild, protected Ui_DialogRotationStageStanda
{
	Q_OBJECT
public:
	DialogRotationStageStanda(QWidget* parent = 0, Qt::WFlags flags = 0);
...
};
 
DialogRotationStageStanda::DialogRotationStageStanda(QWidget* parent /*= 0*/, Qt::WFlags flags /*= 0*/) 
	: MdiChild(parent, flags) 
{
	setupUi(this);	
	makeMDIChild(this);
	setDescription(this->windowTitle());	
}

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within this Dialog (which is a SubWindow) I would like to access the QMdiSubWindow it belongs to, is this possible somehow, without saving the window for each class?

If I try to do

Code:

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MainWindowMdiArea->activeSubWindow()->widget()->parentWidget()->resize(width(), height);

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within the dialog, I get the linker error:

Quote:

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Nicht aufgelöstes externes Symbol ""class QPointer<class QMdiArea> MainWindowMdiArea" (?MainWindowMdiArea@@3V?$QPointer@VQMdiArea@@@@A)" .

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Does something like:

Code:

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QMdiSubWindow *sw = qobject_cast<QMdiSubWindow *>(parentWidget());
if (sw) 
    do stuff with parent;

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in the MDI sub window's child widget code work for you?