Qt best way to invoke methods of QMainWindow from other widget

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Qt best way to invoke methods of QM...

January 25, 2012

umen242

Ant Farmer
328 posts

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 ?
}

2 replies

January 25, 2012

Lukas Geyer

Gene Splicer
2074 posts

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

January 25, 2012

Volker

Robot Herder
5428 posts

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.

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January 25, 2012