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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 ( 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 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.

       c s s s l l l l l l l l l l l l.  Table 1 Controls  Mask  Bits  _  Mask
       Bit  which  or    enabled   Value       changed_ctrls  _ctrls  _ XkbRe-
       peatKeysMask   ok   ok   (1L<<0)  XkbSlowKeysMask     ok   ok   (1L<<1)
       XkbBounceKeysMask   ok   ok   (1L<<2)                         XkbStick-
       yKeysMask   ok   ok   (1L<<3)     XkbMouseKeysMask    ok   ok   (1L<<4)
       XkbMouseKeysAccelMask    ok   ok   (1L<<5)                       XkbAc-
       cessXKeysMask  ok   ok   (1L<<6)                     XkbAccessXTimeout-
       Mask    ok   ok   (1L<<7)    XkbAccessXFeedbackMask   ok   ok   (1L<<8)
       XkbAudibleBellMask       ok   (1L<<9)                          XkbOver-
       lay1Mask          ok   (1L<<10)  XkbOverlay2Mask          ok   (1L<<11)
       XkbIgnoreGroupLockMask        ok   (1L<<12)              XkbGroupsWrap-
       Mask   ok        (1L<<27) XkbInternalModsMask ok        (1L<<28) XkbIg-
       noreLockModsMask    ok        (1L<<29)                 XkbPerKeyRepeat-
       Mask ok        (1L<<30)     XkbControlsEnabledMask   ok        (1L<<31)
       XkbAccessXOptionsMask    ok   ok   (XkbStickyKeysMask | XkbAccessXFeed-
       backMask)   XkbAllBooleanCtrlsMask        ok   (0x00001FFF)  XkbAllCon-
       trolsMask  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 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
       major extension opcode. Otherwise, event_type is set  to  the  type  of
       event  that  caused the change (one of KeyPress, KeyRelease, DeviceKey-
       Press, DeviceKeyRelease, 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 ButtonRe-
       lease, 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 1.1.5        XkbNoteControlsChanges(3)