On 4 May 2013, at 3:54 AM, Josh Faust wrote:

> There doesn't appear to be any way of handling Window close events in QtQuick 
> (nor, now that I look at it, in QWindow). Am I missing something obvious?

onVisibleChanged or onVisibilityChanged perhaps?  But it happens after the 
window is already closed, so you can do some auto-saving of data for example, 
but it's a bit late to pop up a FileDialog to prompt the user where to save 
(the FileDialog would have no visible parent window).  Otherwise you could 
override QWindow::event() and handle the close event, but it's inconvenient to 
write the C++ and then change your QML to use the custom subclass, for such an 
expected feature.  I guess we will need to think of an easier way.

https://bugreports.qt-project.org/browse/QTBUG-31019

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