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NAME

       XkbChangeMap   -   Update   only   partial  components  of  a  keyboard
       description, modify the  appropriate  fields  in  the  server  and  map
       components of a local copy of the keyboard description

SYNOPSIS

       Bool  XkbChangeMap  (Display  *dpy,  XkbDescPtr  xkb,  XkbMapChangesPtr
              changes);

ARGUMENTS

       - dpy  connection to X server

       - xkb  description from which new values are taken

       - changes
              identifies component parts to update

DESCRIPTION

       To update only partial components of a keyboard description, modify the
       appropriate  fields in the server and map components of a local copy of
       the   keyboard   description,   then   call   XkbChangeMap   with    an
       XkbMapChangesRec structure indicating which components have changed.

       XkbChangeMap  copies  any components specified by the changes structure
       from the keyboard description, xkb, to the X server specified by dpy.

       If any components specified by changes  are  not  present  in  the  xkb
       parameter, XkbChangeMap returns False. Otherwise, it sends a request to
       the server and returns True.

       XkbChangeMap can generate BadAlloc, BadLength,  and  BadValue  protocol
       errors.

RETURN VALUES

       True           The XkbChangeMap function returns True if the components
                      specified by changes are present in the xkb parameter.

       False          The  XkbChangeMap  function   returns   False   if   the
                      components  specified  by changes are not present in the
                      xkb parameter.

STRUCTURES

       Use the  XkbMapChangesRec  structure  to  identify  and  track  partial
       modifications  to  the  mapping  components and to reduce the amount of
       traffic between the server and clients.

       typedef struct _XkbMapChanges {
           unsigned short   changed;            /∗ identifies valid components in
       structure */
           KeyCode          min_key_code;       /∗ lowest numbered keycode for device
       */
           KeyCode          max_key_code;       /∗ highest numbered keycode for device
       */
           unsigned char    first_type;         /∗ index of first key type modified */
           unsigned char    num_types;          /∗ # types modified */
           KeyCode          first_key_sym;      /∗ first key whose key_sym_map changed
       */
           unsigned char    num_key_syms;       /∗ # key_sym_map entries changed */
           KeyCode          first_key_act;      /∗ first key whose key_acts entry
       changed */
           unsigned char    num_key_acts;       /∗ # key_acts entries changed */
           KeyCode          first_key_behavior; /∗ first key whose behaviors changed */
           unsigned char    num_key_behaviors;  /∗ # behaviors entries changed */
           KeyCode          first_key_explicit; /∗ first key whose explicit entry
       changed */
           unsigned char    num_key_explicit;   /∗ # explicit entries changed */
           KeyCode          first_modmap_key;   /∗ first key whose modmap entry changed
       */
           unsigned char    num_modmap_keys;    /∗ # modmap entries changed */
           KeyCode          first_vmodmap_key;  /∗ first key whose vmodmap changed */
           unsigned char    num_vmodmap_keys;   /∗ # vmodmap entries changed */
           unsigned char    pad1;               /∗ reserved */
           unsigned short   vmods;              /∗ mask indicating which vmods changed
       */
       } XkbMapChangesRec,*XkbMapChangesPtr;

DIAGNOSTICS

       BadAlloc       Unable to allocate storage

       BadLength      The length of a request is shorter or longer  than  that
                      required to minimally contain the arguments

       BadValue       An argument is out of range



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