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

XkbAddGeomOverlay(3)			  XKB FUNCTIONS 		     XkbAddGeomOverlay(3)

       XkbAddGeomOverlay - Add one overlay to a section

       XkbOverlayPtr XkbAddGeomOverlay ( section, name, sz_rows )
	     XkbSectionPtr section;
	     Atom name;
	     int sz_rows;

       - section
	      section to which an overlay will be added

       - name name of the overlay

       - sz_rows
	      number of rows to reserve in the overlay

       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.

       XkbAddGeomOverlay adds an overlay with the specified name to the specified  section.   The
       new overlay is created with space allocated for sz_rows rows. If an overlay with name name
       already exists in the section, a pointer to the existing overlay is returned.   XkbAddGeo-
       mOverlay  returns NULL if any of the parameters is empty or if it was not able to allocate
       space for the overlay. To allocate space for an arbitrary number of overlays to a section,
       use the XkbAllocGeomOverlay function.

	   typedef struct _XkbOverlayRec {
	       Atom		     name;	      /* overlay name */
	       XkbSectionPtr	     section_under;   /* the section under this overlay */
	       unsigned short	     num_rows;	      /* number of rows in the rows array */
	       unsigned short	     sz_rows;	      /* size of the rows array */
	       XkbOverlayRowPtr      rows;	      /* array of rows in the overlay */
	       XkbBoundsPtr	     bounds;	      /* bounding box for the overlay */
	   } XkbOverlayRec,*XkbOverlayPtr;


X Version 11				   libX11 1.2.1 		     XkbAddGeomOverlay(3)

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