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XkbNoteDeviceChanges(3)          XKB FUNCTIONS         XkbNoteDeviceChanges(3)



NAME
       XkbNoteDeviceChanges - Note device changes reported in an XkbExtension-
       DeviceNotify event

SYNOPSIS
       void XkbNoteDeviceChanges ( old, new, wanted )
             XkbDeviceChangesPtr old;
             XkbExtensionDeviceNotifyEvent * new;
             unsigned int wanted;

ARGUMENTS
       - old  structure tracking state changes

       - new  event indicating state changes

       - wanted
              mask indicating changes to note

DESCRIPTION
       The wanted field specifies the changes that should be noted in old, and
       is  composed  of  the  bitwise inclusive OR of one or more of the masks
       from Table 1. The reason field of the event in new indicates the  types
       of  changes  the  event is reporting.  XkbNoteDeviceChanges updates the
       XkbDeviceChangesRec specified by old with the  changes  that  are  both
       specified in wanted and contained in new->reason.

                                Table 1 XkbDeviceInfoRec Mask Bits
       ____________________________________________________________________________________
       Name                         XkbDeviceInfoRec Value     Capability If Set
                                    Fields Effected
       ____________________________________________________________________________________
       XkbXI_KeyboardsMask                           (1L <<0) Clients can use all
                                                              Xkb requests and events
                                                              with KeyClass devices
                                                              supported by the input
                                                              device extension.

       XkbXI_ButtonActionsMask       num_btns        (1L <<1) Clients can assign key
                                     btn_acts                 actions to buttons
                                                              non-KeyClass input
                                                              extension devices.

       XkbXI_IndicatorNamesMask      leds->names     (1L <<2) Clients can assign
                                                              names to indicators on
                                                              non-KeyClass input
                                                              extension devices.

       XkbXI_IndicatorMapsMask       leds->maps      (1L <<3) Clients can assign
                                                              indicator maps to
                                                              indicators on
                                                              non-KeyClass input
                                                              extension devices.

       XkbXI_IndicatorStateMask      leds->state     (1L <<4) Clients can request
                                                              the status of indicators
                                                              on non-KeyClass input
                                                              extension devices.

       XkbXI_IndicatorsMask          sz_leds         (0x1c)   XkbXI_IndicatorNamesMask |
                                     num_leds                 XkbXI_IndicatorMapsMask |
                                     leds->*                  XkbXI_IndicatorStateMask

       XkbXI_UnsupportedFeaturesMask unsupported     (1L <<15)

       XkbXI_AllDeviceFeaturesMask   Those selected  (0x1e)   XkbXI_IndicatorsMask |
                                     by Value Column          XkbSI_ButtonActionsMask
                                     masks

       XkbXI_AllFeaturesMask         Those selected  (0x1f)   XkbSI_AllDeviceFeaturesMask |
                                     by Value Column          XkbSI_KeyboardsMask
                                     masks

       XkbXI_AllDetailsMask          Those selected  (0x801f) XkbXI_AllFeaturesMask |
                                     by Value column          XkbXI_UnsupportedFeaturesMask
                                     masks

       To  update  a  local  copy of the state and configuration of an X input
       extension device  with  the  changes  previously  noted  in  an  XkbDe-
       viceChangesRec structure, use XkbGetDeviceInfoChanges.

STRUCTURES
       Changes  to an Xkb extension device may be tracked by listening to Xkb-
       DeviceExtensionNotify events and accumulating the changes in an  XkbDe-
       viceChangesRec  structure.  The changes noted in the structure may then
       be used in subsequent operations to update either a  server  configura-
       tion  or  a  local  copy  of an Xkb extension device configuration. The
       changes structure is defined as follows:

       typedef struct _XkbDeviceChanges {
           unsigned int         changed;       /* bits indicating what has changed */
           unsigned short       first_btn;     /* number of first button which changed, if any */
           unsigned short       num_btns;      /* number of buttons that have changed */
           XkbDeviceLedChangesRec leds;
       } XkbDeviceChangesRec,*XkbDeviceChangesPtr;


SEE ALSO
       XkbGetDeviceInfoChanges(3)



X Version 11                     libX11 1.1.5          XkbNoteDeviceChanges(3)