[Sugar-devel] Hacking onto the "appearing" and "hiding" of OSK

[Ajay Garg]

Hi all.

A simple solution was found :)

I hacked the "KP_Prior" and "KP_Next" keys, and now they are used for
making-window-smaller and restoring-original-window-size respectively :)

All thanks to
       * /usr/share/X11/xkb/keycodes/evdev
       * sugar/src/jarabe/view/keyhandler.py



Just one thing I noticed when  I tried to have the above keys take effect
ONLY in ebook-mode (via the "evtest --query" test), that when I ran this
again and again via the "suprocess" module, the XO-4 behaved very
erratically. However, when I made the keys take effect irrespective of the
test of ebook-mode, things worked cool. However, I will keep on looking
into the reason.


Thanks a ton to all :)


On Thu, Jan 24, 2013 at 10:45 PM, Paul Fox <pgf at laptop.org> wrote:

> gonzalo wrote:
>  > Write does not know what is the ebook switch state, that logic is in the
>  > osk.
>  >
>  > Looking in the wiki and sugar code, I could not find information about
> how
>  > read the switch,
>  > but in ticket http://dev.laptop.org/ticket/12326 found this:
>  >
>  > If you do:
>  >
>  > evtest --query /dev/input/event4 EV_SW SW_TABLET_MODE; echo $?
>  >
>  >
>  > If the xo is in ebook mode returns 10, if not, returns 0.
>  >
>  > There are any official doc about the switches I am missing? There are a
> way
>  > to catch a event when the switch is activated, using dbus or something
>  > similar?
>
> if you open the device and read it, you'll get a stream of "struct
> input_event" structures (/usr/include/linux/input.h) representing
> opening and closing of the SW_TABLET_MODE switch.  here's a C code
> snippet from olpc-switchd (part of powerd):
>
>     void ebook_event()
>     {
>         struct input_event ev[1];
>
>         if (read(ebk_fd, ev, sizeof(ev)) != sizeof(ev))
>             die("bad read from ebook switch");
>
>         dbg(3, "ebk: ev sec %d usec %d type %d code %d value %d",
>             ev->time.tv_sec, ev->time.tv_usec,
>             ev->type, ev->code, ev->value);
>
>         if (ev->type == EV_SW && ev->code == SW_TABLET_MODE) {
>             if (ev->value)
>                 send_event("ebookclose", round_secs(ev), ebk_device);
>             else
>                 send_event("ebookopen", round_secs(ev), ebk_device);
>         }
>     }
>
>
> perhaps there's an evdev to dbus gateway of some sort, but i don't know
> about it, if so.
>
> the "evtest" commandline example, above, uses an ioctl on the input
> device to determine current state.  here's snippet from the evtest source:
> (full source:  git://anongit.freedesktop.org/evtest)
>
>     static int query_device(const char *device, const struct query_mode
> *query_mode>
>     {
>             int fd;
>             int r;
>             unsigned long state[NBITS(query_mode->max)];
>
>             fd = open(device, O_RDONLY);
>             if (fd < 0) {
>                     perror("open");
>                     return EXIT_FAILURE;
>             }
>             memset(state, 0, sizeof(state));
>             r = ioctl(fd, query_mode->rq, state);
>             close(fd);
>
>             if (r == -1) {
>                     perror("ioctl");
>                     return EXIT_FAILURE;
>             }
>
>             if (test_bit(keycode, state))
>                     return 10; /* different from EXIT_FAILURE */
>             else
>                     return 0;
>     }
>
>
>
> paul
>
>
>  >
>  > Gonzalo
>  >
>  >
>  > On Thu, Jan 24, 2013 at 12:16 PM, Martin Langhoff <
> martin.langhoff at gmail.com
>  > > wrote:
>  >
>  > > On Thu, Jan 24, 2013 at 10:13 AM, Paul Fox <pgf at laptop.org> wrote:
>  > > > i believe sugar already has code to detect the two modes, since
>  > > > that's how it knows whether to present the OSK or not.
>  > >
>  > > Yep. Ajay, I think Write shows you the way :-)
>  > >
>  > >
>  > >
>  > >
>  > > m
>  > > --
>  > >  martin.langhoff at gmail.com
>  > >  martin at laptop.org -- Software Architect - OLPC
>  > >  - ask interesting questions
>  > >  - don't get distracted with shiny stuff  - working code first
>  > >  - http://wiki.laptop.org/go/User:Martinlanghoff
>  > >
>
> =---------------------
>  paul fox, pgf at laptop.org
> _______________________________________________
> Devel mailing list
> Devel at lists.laptop.org
> http://lists.laptop.org/listinfo/devel
>



-- 
Regards,

Ajay Garg
Dextrose Developer
Activity Central: http://activitycentral.com
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