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.TH XkbAddGeomOverlayKey __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
.SH NAME
XkbAddGeomOverlayKey \- Add a key to an existing overlay row
.SH SYNOPSIS
.HP
.B XkbOverlayKeyPtr XkbAddGeomOverlayKey
.BI "(\^XkbOverlayPtr " "overlay" "\^,"
.BI "XkbRowPtr " "row" "\^,"
.BI "_Xconst char *" "over" "\^,"
.BI "_Xconst char *" "under" "\^);"
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I \- overlay
overlay to be updated
.TP
.I \- row
row in overlay to be updated
.TP
.I \- under
primary name of the key to be considered 
.SH DESCRIPTION
.LP
Xkb provides functions to add a single new element to the top-level keyboard 
geometry. In each case the 
.I num_ * 
fields of the corresponding structure is incremented by 1. These functions do 
not change 
.I 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 
.I geometry properties. 
A geometry property associates an arbitrary string with an equally arbitrary 
name. Programs that display images of keyboards can use geometry properties as 
hints, but they are not interpreted by Xkb. No other geometry structures refer 
to geometry properties.

.I XkbAddGeomOverlayKey 
adds one key to the 
.I row 
in the 
.I overlay. 
If there is no key named 
.I under 
in the row of the underlying section, 
.I XkbAddGeomOverlayKey 
returns NULL.
.SH STRUCTURES
.LP
.nf

    typedef struct _XkbOverlayKey {
        XkbKeyNameRec           over;      /\&* name of this overlay key */
        XkbKeyNameRec           under;     /\&* name of the key under this overlay key */
    } XkbOverlayKeyRec,*XkbOverlayKeyPtr;
.fi