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X11R7.4 - man page for xkbvirtualmodstoreal (x11r4 section 3)

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XkbVirtualModsToReal(3) 		  XKB FUNCTIONS 		  XkbVirtualModsToReal(3)

       XkbVirtualModsToReal - Determines the mapping of virtual modifiers to core X protocol mod-

       Bool XkbVirtualModsToReal ( xkb, virtual_mask, mask_rtrn )
	     XkbDescPtr  xkb ;
	     unsigned int  virtual_mask ;
	     unsigned int * mask_rtrn ;

       - xkb  keyboard description for input device

       - virtual_mask
	      virtual modifier mask to translate

       - mask_rtrn
	      backfilled with real modifiers

       Xkb maintains a virtual modifier mapping, which lists  the  virtual  modifiers  associated
       with, or bound to, each key. The real modifiers bound to a virtual modifier always include
       all of the modifiers bound to any of the keys that specify that virtual modifier in  their
       virtual	modifier  mapping. The server.vmodmap array indicates which virtual modifiers are
       bound to  each  key;  each  entry  is  a  bitmask  for  the  virtual  modifier  bits.  The
       server.vmodmap array is indexed by keycode.

       The  vmodmap and vmods members of the server map are the "master" virtual modifier defini-
       tions. Xkb automatically propagates any changes to these fields to all other  fields  that
       use virtual modifier mappings.

       For  example,  if Mod3 is bound to the Num_Lock key by the core protocol modifier mapping,
       and the NumLock virtual modifier is bound to they Num_Lock key  by  the	virtual  modifier
       mapping, Mod3 is added to the set of modifiers associated with NumLock.

       The  virtual  modifier  mapping	is  normally  updated  whenever actions are automatically
       applied to symbols and few applications should need to change the virtual modifier mapping

       Use  XkbGetMap  to  get	the virtual modifiers from the server or use XkbGetVirtualMods to
       update a local copy of the virtual modifiers bindings from the server. To set the  binding
       of a virtual modifier to a real modifier, use XkbGetVirtualMods

       If  the	keyboard description defined by xkb includes bindings for virtual modifiers, Xkb-
       VirtualModsToReal uses those bindings to determine the set of real modifiers  that  corre-
       spond to the set of virtual modifiers specified in virtual_mask.  The virtual_mask parame-
       ter is a mask specifying the virtual modifiers to translate; the i-th bit (0 relative)  of
       the mask represents the i-th virtual modifier. If mask_rtrn is non-NULL, XkbVirtualModsTo-
       Real backfills it with the resulting real modifier mask. If the	keyboard  description  in
       xkb does not include virtual modifier bindings, XkbVirtualModsToReal returns False; other-
       wise, it returns True.

       True	      The XkbVirtualModsToReal function returns True if the keyboard  description
		      in xkb does include virtual modifier bindings.

       False	      The XkbVirtualModsToReal function returns False if the keyboard description
		      in xkb does not include virtual modifier bindings.

       XkbGetMap(3), XkbGetVirtualMods(3)

       It is possible for a local (client-side) keyboard description (the xkb parameter)  to  not
       contain	any virtual modifier information (simply because the client has not requested it)
       while the server's corresponding definition may contain virtual modifier information.

X Version 11				   libX11 1.2.1 		  XkbVirtualModsToReal(3)
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