Qt best way to invoke methods of QMainWindow from other widget

[umen242]

I have main window from type QMainWindow, then I set some widget and give this widget the QMainWindow as parent in its constructor , the QMainWindow passed as Object. now I need from this widget invoke method from the QMainWindow. what will be the best way to do it ?

this is how the widget looks like:

@DataListModel::DataListModel( QObject *parent ) :
QStandardItemModel( 0, 0, parent )

{
// here I like to invoke some QMainWindow method?
//can I cast somehow the parent ? or use some pointer ?

}
@

[lgeyer]

@
QMainWindow mainWindow = qobject_cast<QMainWindow>(parent());
if(mainWindow != 0)
{
...
}
@

[goetz]

Or if you always pass a QMainWindow as parent, change the constructor to take only QMainWindow pointers as parent and save the parent in a class attribute.