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

XkbResizeKeyActions(3)			  XKB FUNCTIONS 		   XkbResizeKeyActions(3)

       XkbResizeKeyActions - Change the number of actions bound to a key

       XkbAction * XkbResizeKeyActions ( xkb, key, needed )
	     XkbDescRec * xkb;
	     int key;
	     int needed;

       - xkb  keyboard description to change

       - key  keycode of key to change

       - needed
	      new number of actions required

       The  xkb  parameter  points to the keyboard description containing the key whose number of
       actions is to be changed. The key parameter is the keycode  of  the  key  to  change,  and
       needed specifies the new number of actions required for the key.

       XkbResizeKeyActions reserves the space needed for the actions and returns a pointer to the
       beginning of the new array that holds the actions. It can change the acts,  num_acts,  and
       size_acts fields of xkb->server if it is necessary to reallocate the acts array.

       If  needed  is greater than the current number of keysyms for the key, XkbResizeKeyActions
       initializes all new actions in the array to NoAction.

       Because the number of actions needed by a key is normally computed as width  *  number  of
       groups,	and  XkbResizeKeyActions does not modify either the width or number of groups for
       the key, a discrepancy exists on return from XkbResizeKeyActions between the  space  allo-
       cated  for  the actions and the number required. The unused entries in the list of actions
       returned by XkbResizeKeyActions are not preserved across future calls to any  of  the  map
       editing	functions, so you must update the key actions (which updates the width and number
       of groups for the key) before calling another allocator function. A call to XkbChangeType-
       sOfKey updates these.

       If  any	allocation  errors  occur  while resizing the number of actions bound to the key,
       XkbResizeKeyActions returns NULL.

       XkbChangeTypesOfKey(3), XkbResizeKeySyms(3)

       A change to the number of actions bound to a key should be accompanied by a change in  the
       number of symbols bound to a key. Refer to XkbResizeKeySyms for more information on chang-
       ing the number of symbols bound to a key.

X Version 11				   libX11 1.2.1 		   XkbResizeKeyActions(3)

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