[Wayland-bugs] [Bug 770745] wayland: Warn when an application tries to map popup incorrectly

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770745

--- Comment #9 from Eric Williams <ericwill at redhat.com> ---
(In reply to Jonas Ådahl from comment #7)
> (In reply to Eric Williams from comment #6)
> > What protocol does this violate? And why only on Wayland and not X11? 
> 
> The xdg-shell protocol. It doesn't violate anything on X11 because X11 is
> more of a "you're on your own" windowing system, while Wayland is much less
> so.
> 
> > 
> > I am dealing with a bug in SWT that is related to this fix -- if you could
> > explain the logic here it would help understand the issue further.
> 
> The warning should happen when you map a popup (i.e. a popup menu that grabs
> input) above some other window that is not the top most popup or the
> toplevel.
> 
> For example, lets say you have a toplevel window (e.g. the "main" window of
> your application) and an already open popup menu with the toplevel as a
> parent. Then you open another popup menu before closing the first one, but
> the new popup menu also has the toplevel window as the parent. In xdg-shell
> (the Wayland protocol that provides methods for creating "windows", "menus"
> etc), this is now allowed, since that would mean two menus would "grab" the
> same input device at the same time, which makes no sense.
> 
> If you need to have multi level menus, what you need to do is to make sure
> that each new child menu is mapped with the old top most child menu as
> parent. If you are not using GtkMenu, you might be interested in bug 791845.

Okay thanks, this was very helpful. We could definitely make use of that public
API so I'll comment in that bug.

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