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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,  XkbControlsNotifyEvent  *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 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 1 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 1 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.

       The  wanted parameter is a bitwise inclusive OR of bits taken from the set of masks speci-
       fied in Table 1 with "ok" in the changed_ctrls column.  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 1.6.0 		XkbNoteControlsChanges(3)
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