Qt4: Placing QMainWindow instance inside other QWidget/QMainWindow

Question

I\'d like to place QMainWindow instance inside another QWidget (for example centralWidget of another QMainWindow).

I\'m wondering why it doesn\'t work ? QMainWindow

Answer 1

centralwidget = new QMainWindow(this);
centralwidget->setWindowFlags(Qt::Widget);
setCentralWidget(centralwidget);

This should help.

Answer 2

Having the same problem, I found the solution here.

QMainWindow sets its window type to Qt::Window so that it will be in an independent window even if it has a parent (you can confirm this by calling show() on your QMainWindow, and you will see it in its own window). Try adding the line

window->setWindowFlags(Qt::Widget);

after you construct the QMainWindow.

Answer 3

QMainWindow provides predefined stuff like toolbars and status bars and menu bars in a platform agnostic way (it "does the right thing", without manual intervention). If all you need is a bunch of buttons in a layout, use QWidget.

You need to make sure each QMainWindow has centralQWidget`, other than that, you should be fine.