Why doesn't my dialog window close when the mainwindow is closed?

[jpn]

Try to set attribute Qt::WA_DeleteOnClose for the main window. This assures that the main window is deleted upon closing and so the dialog should be destructed also.

[pir]

I thought that the MainWindow was set to this as default. Thanks, I will try that. It's good to know, but I solved the problem with implementing the closeEvent() and close down all dialogs there. I needed to save the state of the dialogs anyway...

But is the parent child relation ok?
Because I'm a bit unsure about how the destruction of the widgets work. Can't find it explained in detail on the homepage. According to what I've understaned , is the children automatically destructed when the parent is destructed. But what about orphins? Do I need to destroy them myself, or does Qt's main loop take care of this when I close down the Qt session?

thanks
pir

[wysota]

Because I'm a bit unsure about how the destruction of the widgets work.

If a QObject is destructed, it destroys all its children each of which in turn destroy all its children, etc.

But what about orphins? Do I need to destroy them myself, or does Qt's main loop take care of this when I close down the Qt session?

You have to destroy them yourself. Qt doesn't do anything *magic*, it's just a C++ library.