XkbNoteDeviceChanges(3)   XKB FUNCTIONS   XkbNoteDeviceChanges(3)



NAME
       XkbNoteDeviceChanges  - Note device changes reported in an
       XkbExtensionDeviceNotify 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 Xkb-
       DeviceChangesRec  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 XkbDeviceChangesRec structure, use XkbGetDevi-
       ceInfoChanges.

STRUCTURES
       Changes to an Xkb extension device may be tracked by  lis-
       tening to XkbDeviceExtensionNotify events and accumulating
       the  changes  in  an  XkbDeviceChangesRec  structure.  The
       changes  noted in the structure may then be used in subse-
       quent operations to update either a  server  configuration
       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)