[Qt-interest] Dragging QDockWidget between multiple windows in Qt4

[John Cummings]

I have a few QDockWidgets that I would like to share between multiple
QMainWindows. In Qt3, I simply had to say something like:

mainWindow1->setDockEnabled(dockWindow, Qt::DockTop, true);
mainWindow2->setDockEnabled(dockWindow, Qt::DockTop, true);

and then dockWindow could be dragged between the top dock areas of
mainWindow1 and mainWindow2. That is exactly what I want (I enable more of
the dock areas, however) but I don't see this functionality in Qt4 apart
from Q3MainWindow.

I started off calling:

mainWindow1->addDockWidget(Qt::TopDockWidgetArea, dockWidget);
mainWindow2->addDockWidget(Qt::TopDockWidgetArea, dockWidget);

but this code simply reparents dockWidget twice and it ends up in mainWindow2 
and I cannot drag dockWidget between mainWindow1 and mainWindow2. I then 
tried intercepting events, but it appears that QDockWidget uses internal 
calls to place itself into the main window (i.e., not drag/drop type events 
or a QDrag object that I could tell).

So, I started down the path of doing a full up drag and drop, but that seems 
too complicated for something that previously worked without much fuss. So, I 
scoured this list and some other forums, looking for some details on how to 
accomplish this seemingly simple task. None of them seem to talk about this 
issue. I hope I have simply missed something obvious.

So, is it possible to drag and drop dock widgets between main windows? In
other words, can a QDockWidget object be easily docked to different
QMainWindow objects (only one at a time of course)?

Thank you
John Cummings