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

XkbGetControlsChanges(3)		  XKB FUNCTIONS 		 XkbGetControlsChanges(3)

       XkbGetControlsChanges  -  Updates  a local copy of a keyboard description with the changes
       previously noted by one or more calls to XkbNoteControlsChanges

       XkbGetControlsChanges ( dpy, xkb, changes )
	     Display * dpy;
	     XkbDescPtr xkb;
	     XkbNameChangesPtr changes;

       - dpy  connection to X server

       - xkb  xkb->ctrls will be updated

       - changes
	      indicates which parts of xkb->ctrls to update

       Whenever a field in the controls structure changes in the server's  keyboard  description,
       the  server  sends an XkbControlsNotify event to all interested clients.To receive XkbCon-
       trolsNotify events under all possible conditions, use XkbSelectEvents and pass XkbControl-
       sNotifyMask in both bits_to_change and values_for_bits.

       To  receive  XkbControlsNotify events only under certain conditions, use XkbSelectEventDe-
       tails using XkbControlsNotify as the event_type and specifying the desired  state  changes
       in bits_to_change and values_for_bits using mask bits from Table 1.

       Table  1  shows the actual values for the individual mask bits used to select controls for
       modification and to enable and disable the control. Note that the same mask bit is used to
       specify general modifications to the parameters used to configure the control (which), and
       to enable and disable the control (enabled_ctrls). The anomalies in the table (no "ok"  in
       column)	are  for controls that have no configurable attributes; and for controls that are
       not boolean controls and therefore cannot be enabled or disabled.

			      Table 1 Controls Mask Bits
       Mask Bit 		 which or	 enabled   Value
				 changed_ctrls	 _ctrls
       XkbRepeatKeysMask	 ok		 ok	   (1L<<0)
       XkbSlowKeysMask		 ok		 ok	   (1L<<1)
       XkbBounceKeysMask	 ok		 ok	   (1L<<2)
       XkbStickyKeysMask	 ok		 ok	   (1L<<3)
       XkbMouseKeysMask 	 ok		 ok	   (1L<<4)
       XkbMouseKeysAccelMask	 ok		 ok	   (1L<<5)
       XkbAccessXKeysMask	 ok		 ok	   (1L<<6)
       XkbAccessXTimeoutMask	 ok		 ok	   (1L<<7)
       XkbAccessXFeedbackMask	 ok		 ok	   (1L<<8)
       XkbAudibleBellMask			 ok	   (1L<<9)
       XkbOverlay1Mask				 ok	   (1L<<10)
       XkbOverlay2Mask				 ok	   (1L<<11)
       XkbIgnoreGroupLockMask			 ok	   (1L<<12)
       XkbGroupsWrapMask	 ok			   (1L<<27)
       XkbInternalModsMask	 ok			   (1L<<28)
       XkbIgnoreLockModsMask	 ok			   (1L<<29)
       XkbPerKeyRepeatMask	 ok			   (1L<<30)
       XkbControlsEnabledMask	 ok			   (1L<<31)
       XkbAccessXOptionsMask	 ok		 ok	   (XkbStickyKeysMask |

       XkbAllBooleanCtrlsMask			 ok	   (0x00001FFF)
       XkbAllControlsMask	 ok			   (0xF8001FFF)

       The changed_ctrls field specifies the controls components that have changed  and  consists
       of bits taken from the masks defined in Table 10.7 with "ok" in the changed_ctrls column.

       The  controls  currently enabled in the server are reported in the enabled_ctrls field. If
       any controls were just enabled or disabled (that is, the  contents  of  the  enabled_ctrls
       field  changed),  they  are  flagged in the enabled_ctrl_changes field. The valid bits for
       these fields are the masks listed in Table 10.7 with "ok" in the enabled_ctrls column. The
       num_groups  field reports the number of groups bound to the key belonging to the most num-
       ber of groups and is automatically updated when the keyboard mapping changes.

       If the change was caused by a request from a client, the keycode and event_type fields are
       set  to	zero  and  the req_major and req_minor fields identify the request. The req_major
       value is the same as the major extension opcode. Otherwise, event_type is set to the  type
       of event that caused the change (one of KeyPress, KeyRelease, DeviceKeyPress, DeviceKeyRe-
       lease, ButtonPress or ButtonRelease),  and  req_major  and  req_minor  are  undefined.  If
       event_type is KeyPress, KeyRelease, DeviceKeyPress, or DeviceKeyRelease, the keycode field
       is set to the key that caused the change. If event_type is ButtonPress  or  ButtonRelease,
       keycode contains the button number.

       When  a	client	receives an XkbControlsNotify event, it can note the changes in a changes
       structure using XkbNoteControlsChanges.

       XkbGetControlsChanges examines the changes parameter, queries the server for the necessary
       information, and copies the results into the xkb->ctrls keyboard description. If the ctrls
       field of xkb is NULL, XkbGetControlsChanges allocates and  initializes  it.  To	free  the
       ctrls field, use XkbFreeControls.

       XkbGetControlsChanges  returns  Success if successful and can generate BadAlloc, BadImple-
       mentation, and BadMatch errors.

       Success	      The XkbGetControlsChanges function returns Success  if  the  query  of  the
		      server was successful.

       The structure for the XkbControlsNotify event is defined as follows:

       typedef struct {
	   int		 type;		/* Xkb extension base event code */
	   unsigned long serial;	/* X server serial number for event */
	   Bool 	 send_event;	/* True => synthetically generated */
	   Display *	 display;	/* server connection where event generated */
	   Time 	 time;		/* server time when event generated */
	   int		 xkb_type;	/* XkbCompatMapNotify */
	   int		 device;	/* Xkb device ID, will not be XkbUseCoreKbd */
	   unsigned int  changed_ctrls; /* bits indicating which controls data have
	   unsigned int  enabled_ctrls; /* controls currently enabled in server */
	   unsigned int  enabled_ctrl_changes; /* bits indicating enabled/disabled
       controls */
	   int		 num_groups;	/* current number of keyboard groups */
	   KeyCode	 keycode;	/* != 0 => keycode of key causing change */
	   char 	 event_type;	/* Type of event causing change */
	   char 	 req_major;	/* major event code of event causing change */
	   char 	 req_minor;	/* minor event code of event causing change */
       } XkbControlsNotifyEvent;

       BadAlloc       Unable to allocate storage

		      Invalid reply from server

       BadMatch       A  compatible version of Xkb was not available in the server or an argument
		      has correct type and range, but is otherwise invalid

       XkbFreeControls(3),    XkbNoteControlsChanges(3),     XkbSelectEventDetails(3),	   XkbSe-

X Version 11				   libX11 1.2.1 		 XkbGetControlsChanges(3)

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