Re: [PATCH v2 2/3] ui: Switch "-display sdl" to use the QAPI parser

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, May 19, 2022 at 09:27:08AM +0200, Thomas Huth wrote:
> On 19/05/2022 09.08, Thomas Huth wrote:
> > On 19/05/2022 08.39, Thomas Huth wrote:
> > > On 18/05/2022 17.08, Markus Armbruster wrote:
> > > > Thomas Huth <thuth@redhat.com> writes:
> > > > 
> > > > > The "-display sdl" option still uses a hand-crafted parser for its
> > > > > parameters since we didn't want to drag an interface we considered
> > > > > somewhat flawed into the QAPI schema. Since the flaws are gone now,
> > > > > it's time to QAPIfy.
> > > > > 
> > > > > This introduces the new "DisplaySDL" QAPI struct that is used to hold
> > > > > the parameters that are unique to the SDL display. The only specific
> > > > > parameter is currently "grab-mod" that is used to specify the required
> > > > > modifier keys to escape from the mouse grabbing mode.
> > > > > 
> > > > > Signed-off-by: Thomas Huth <thuth@redhat.com>
> > > > > ---
> > > > >   qapi/ui.json            | 27 +++++++++++++++-
> > > > >   include/sysemu/sysemu.h |  2 --
> > > > >   softmmu/globals.c       |  2 --
> > > > >   softmmu/vl.c            | 70 +----------------------------------------
> > > > >   ui/sdl2.c               | 10 ++++++
> > > > >   5 files changed, 37 insertions(+), 74 deletions(-)
> > > > > 
> > > > > diff --git a/qapi/ui.json b/qapi/ui.json
> > > > > index 11a827d10f..a244e26e0f 100644
> > > > > --- a/qapi/ui.json
> > > > > +++ b/qapi/ui.json
> > > > > @@ -1295,6 +1295,30 @@
> > > > >         '*swap-opt-cmd': 'bool'
> > > > >     } }
> > > > > +##
> > > > > +# @GrabMod:
> > > > > +#
> > > > > +# Set of modifier keys that need to be hold for shortcut key actions.
> > > > > +#
> > > > > +# Since: 7.1
> > > > > +##
> > > > > +{ 'enum'  : 'GrabMod',
> > > > > +  'data'  : [ 'lctrl-lalt', 'lshift-lctrl-lalt', 'rctrl' ] }
> > > > 
> > > > This is fine now.  If we ever generalize to "arbitrary set of modifier
> > > > keys", it'll become somewhat awkward.  No objection from me.
> 
> Oh well, I just noticed that we already have a GrabToggleKeys enum in
> qapi/common.json ... I wonder whether I should try to use that instead? It
> seems to be used in a slightly different context, though, if I get that
> right ...?

It also doesn't distinguish left & right control/alt/shift keys
for some reason.  So you would end up having to add more enum
entries for SDL, none of which overlap with existing enum entries.
Rather a pity, as the consistency would have been nice

With regards,
Daniel
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