XkbNoteDeviceChanges(3) XKB FUNCTIONS XkbNoteDeviceChanges(3)

# [NAME](#NAME)

XkbNoteDeviceChanges - Note device changes reported in an XkbExtensionDeviceNotify event

# [SYNOPSIS](#SYNOPSIS)

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

# [ARGUMENTS](#ARGUMENTS)

[*old*](#old)

structure tracking state changes

[*new*](#new)

event indicating state changes

[*wanted*](#wanted)

mask indicating changes to note

# [DESCRIPTION](#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 XkbDeviceChangesRec structure, use *XkbGetDeviceInfoChanges.*

# [STRUCTURES](#STRUCTURES)

Changes to an Xkb extension device may be tracked by listening to XkbDeviceExtensionNotify events and accumulating the changes in an XkbDeviceChangesRec structure. The changes noted in the structure may then be used in subsequent 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](#SEE_ALSO)

[**XkbGetDeviceInfoChanges**(3)](/man/os/libx11/XkbGetDeviceInfoChanges.3)

libX11 1.8.14 X Version 11

---

Document: XkbNoteDeviceChanges(3) from libx11 1.8.14-r3 (Chainguard OS)
Source: https://gitlab.freedesktop.org/xorg/lib/libx11.git