QMdiArea not adding subwindow - qt

Question

I have an one function which is responsible for initializing custom widget and add it in to the MdiArea.When I call this at first time it is working fine.But if i will call again, it is initializing custom widget but not adding in into the MdiArea. I have mentioned that function here:-
void CArbWaveViewWidget::newFile()
{
m_ptrWavePresenter = new CArbWavePresenter;
QMdiSubWindow *subWindow1 = new QMdiSubWindow;
subWindow1->setWidget(m_ptrWavePresenter->getTableView()); // getting customWidget
qDebug()<<"Table View ==="<<m_ptrWavePresenter->getTableView();
subWindow1->setAttribute(Qt::WA_DeleteOnClose);
QMdiSubWindow *subWindow2 = new QMdiSubWindow;
subWindow2->setWidget(m_ptrWavePresenter->getGraphView()); // getting customWidget
qDebug()<<"Graph View ==="<<m_ptrWavePresenter->getGraphView();
subWindow2->setAttribute(Qt::WA_DeleteOnClose);
mdiArea->addSubWindow(subWindow1);
mdiArea->addSubWindow(subWindow2);
}
How can i solve this problem?

Answer 1

1. Declare your QMdiSubWindow
When you declare a QMdiSubWindow, give mdiArea as argument
QMdiSubWindow *subWindow = new QMdiSubWindow(mdiArea);
or you can use setParent ( QWidget * parent )
QMdiSubWindow *subWindow = new QMdiSubWindow();
subWindow->setParent(mdiArea);
2. Create and add your QWidget in your QMdiSubWindow
QWidget *myWidget = new QWidget();
subWindow->setWidget(myWidget);
3. Update QMdiSubWindow content
If you need to update the subwindow content, declare your QMdiSubWindow as class variable, initialize your QMdiArea and QMdiSubWindow and set QWidget
yourClass.h
class yourClass {
public:
yourClass();
void newFile();
private:
QMdiArea *m_area;
QMdiSubWindow *m_subWindow1, *m_subWindow2;
void init();
};
yourClass.cpp
yourClass::yourClass()
{
init();
}
void yourClass::init()
{
m_area = new QMdiArea();
m_subWindow1 = new QMdiSubWindow(m_area);
m_subWindow2 = new QMdiSubWindow(m_area);
// continue to init your QMdiSubWindow
}
void yourClass::newFile()
{
// Set your QWidget (yourWidget) into your QMdiSubWindow
m_subWindow1->setWidget(yourWidget);
m_subWindow2->setWidget(anotherWidget);
}

Answer 2

You need invoke method "show"
QMdiSubWindow *subWindow = new QMdiSubWindow();
subWindow->setParent(mdiArea);
subWindow->setWidget(yourWidget);
subWindow->show();