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

XkbNoteControlsChanges(3)		  XKB FUNCTIONS 		XkbNoteControlsChanges(3)

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

       void XkbNoteControlsChanges ( changes, new, wanted )
	     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 1.2.1 		XkbNoteControlsChanges(3)

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