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CentOS 7.0 - man page for xkbaddgeomkey (centos section 3)

XkbAddGeomKey(3)			  XKB FUNCTIONS 			 XkbAddGeomKey(3)

       XkbAddGeomKey - Add one key at the end of an existing row of keys

       XkbKeyPtr XkbAddGeomKey (XkbRowPtr row);

       - row  row to be updated

       Xkb  provides functions to add a single new element to the top-level keyboard geometry. In
       each case the num_ * fields of the corresponding structure  is  incremented  by	1.  These
       functions  do  not  change  sz_*  unless there is no more room in the array. Some of these
       functions fill in the values of the element's structure	from  the  arguments.  For  other
       functions, you must explicitly write code to fill the structure's elements.

       The  top-level  geometry  description  includes a list of geometry properties.  A geometry
       property associates an arbitrary string with an equally arbitrary name. Programs that dis-
       play  images  of  keyboards  can use geometry properties as hints, but they are not inter-
       preted by Xkb. No other geometry structures refer to geometry properties.

       Keys are grouped into rows.  XkbAddGeomKey adds one key to the end of the  specified  row.
       The  key is allocated and zeroed.  XkbAddGeomKey returns NULL if row is empty or if it was
       not able to allocate space for the key. To allocate space for an arbitrary number of  keys
       to a row, use XkbAllocGeomKeys.

	   typedef struct _XkbKey {		 /* key in a row */
	       XkbKeyNameRec   name;		 /* key name */
	       short	       gap;		 /* gap in mm/10 from previous key in row */
	       unsigned char   shape_ndx;	 /* index of shape for key */
	       unsigned char   color_ndx;	 /* index of color for key body */
	   } XkbKeyRec, *XkbKeyPtr;


X Version 11				   libX11 1.6.0 			 XkbAddGeomKey(3)

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