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XkbNoteControlsChanges(3)	 XKB FUNCTIONS	     XkbNoteControlsChanges(3)

       XkbNoteControlsChanges  - Notes the changes in a	changes	structure when
       a client	receives an XkbControlsNotify event

       void XkbNoteControlsChanges (XkbControlsChangesPtr changes, XkbControl-
	      sNotifyEvent *new, unsigned int wanted);

       - changes
	      records changes indicated	by new

       - new  tells which things have changed

       - wanted
	      tells which parts	of new to record in changes

       Whenever	a field	in the controls	structure changes in the server's key-
       board description, the server sends an XkbControlsNotify	event  to  all
       interested clients.To receive XkbControlsNotify events under all	possi-
       ble conditions, use XkbSelectEvents and pass  XkbControlsNotifyMask  in
       both bits_to_change and values_for_bits.

       To  receive XkbControlsNotify events only under certain conditions, use
       XkbSelectEventDetails using XkbControlsNotify  as  the  event_type  and
       specifying  the	desired	 state	changes	 in  bits_to_change  and  val-
       ues_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  1
       with "ok" in the	changed_ctrls column.

       The  controls  currently	 enabled in the	server are reported in the en-
       abled_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 1 with "ok" in the enabled_ctrls column. The
       num_groups field	reports	the number of groups bound to the key  belong-
       ing  to the most	number 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 ma-
       jor extension opcode. Otherwise,	event_type is set to the type of event
       that caused the change (one of  KeyPress,  KeyRelease,  DeviceKeyPress,
       DeviceKeyRelease,  ButtonPress  or  ButtonRelease),  and	 req_major and
       req_minor are undefined.	If event_type  is  KeyPress,  KeyRelease,  De-
       viceKeyPress,  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.

       The wanted parameter is a bitwise inclusive OR of bits taken  from  the
       set  of	masks specified	in Table 1 with	"ok" in	the changed_ctrls col-
       umn.  XkbNoteControlsChanges copies any changes	reported  in  new  and
       specified in wanted into	the changes record specified by	old.

       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 changed*/
	   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;

       XkbSelectEventDetails(3), XkbSelectEvents(3)

X Version 11			 libX11	1.6.12	     XkbNoteControlsChanges(3)


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