[maemo-developers] Howto grab all Maemo5 zoom key events in SDL/SDL_gles app?

[From: Kimmo Hämäläinen]

On Sun, 2010-05-02 at 13:26 +0200, ext Till Harbaum / Lists wrote:
> Hi,
> 
> i'd like to access the zoom keys in a SDL/SDL_gles app (the 3d globe
> i uploaded to extras-devel).
> 
> The odd thing is that my solution only partly works. Some key presses actually
> reach my app as function key presses, but still most of them reach the volume
> control. So when repeatedly pressing the zoom buttons my app zooms but also
> the volume is changed.
> 
> I am using the following code which is inspired by code from scummvm. I am 
> calling this code once immediately after the SDL setup is done.
> 
> Any idea why this still delivers some key events to the volume control?

It could be that _NET_ACTIVE_WINDOW or MB_CURRENT_APP_WINDOW on the root
window does not correspond to your window.  The volume app is tracking
one of these (I think _NET_ACTIVE_WINDOW) to determine the window whose
ZOOM_KEY window property matters.

-Kimmo

> 
>   SDL_SysWMinfo info;
>   SDL_VERSION(&info.version);                                                                                                                          
>   if ( SDL_GetWMInfo(&info) ) {                                                                                                                        
> 
>     /* We use the SDL GFX display (we're using the GFX window too after all) */
>     Display *dpy = info.info.x11.display;
>     unsigned long val = 1;
>     Atom atom_zoom = XInternAtom(dpy, "_HILDON_ZOOM_KEY_ATOM", 0);
>     info.info.x11.lock_func();
>     Window win = info.info.x11.window;
>     XUnmapWindow(dpy,win);
>     XChangeProperty (dpy,win,atom_zoom,XA_INTEGER,32,PropModeReplace,(unsigned char *) &val,1);
>     XMapWindow(dpy,win);
>     info.info.x11.unlock_func();
>   }
> 
> Till
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