To determine whether the X server allows Xkb access to particular capabilities of input devices other
than the core X keyboard, or to determine the status of indicator maps, indicator names or button actions
on a non-KeyClass extension device, use XkbGetDeviceInfo.XkbGetDeviceInfo returns information about the input device specified by device_spec. Unlike the
device_spec parameter of most Xkb functions, device_spec does not need to be a keyboard device. It must,
however, indicate either the core keyboard or a valid X Input Extension device.
The which parameter is a mask specifying optional information to be returned. It is an inclusive OR of
one or more of the values from Table 1 and causes the returned XkbDeviceInfoRec to contain values for the
corresponding fields specified in the table.
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
The XkbDeviceInfoRec returned by XkbGetDeviceInfo always has values for name (may be a null string, ""),
type,supported,unsupported,has_own_state,dflt_kbd_fd, and dflt_kbd_fb. Other fields are filled in as
specified by which.
Upon return, the supported field will be set to the inclusive OR of zero or more bits from Table 1; each
bit set indicates an optional Xkb extension device feature supported by the server implementation, and a
client may modify the associated behavior.
If the XkbButtonActionsMask bit is set in which, the XkbDeviceInfoRec returned will have the button
actions (btn_acts field) filled in for all buttons.
If which includes one of the bits in XkbXI_IndicatorsMask, the feedback class of the indicators must be
specified in ind_class, and the feedback ID of the indicators must be specified in ind_id. If the
request does not include any of the bits in XkbXI_IndicatorsMask, the ind_class and ind_id parameters are
ignored. The class and ID can be obtained via the input device extension XListInputDevices request.
If any of the XkbXI_IndicatorsMask bits are set in which, the XkbDeviceInfoRec returned will have filled
in the portions of the leds structure corresponding to the indicator feedback identified by ind_class and
ind_id. The leds vector of the XkbDeviceInfoRec is allocated if necessary and sz_leds and num_leds
filled in. The led_class,led_id and phys_indicators fields of the leds entry corresponding to ind_class
and ind_id are always filled in. If which contains XkbXI_IndicatorNamesMask, the names_present and names
fields of the leds structure corresponding to ind_class and ind_id are returned. If which contains
XkbXI_IndicatorStateMask, the corresponding state field is updated. If which contains
XkbXI_IndicatorMapsMask, the maps_present and maps fields are updated.
Xkb provides convenience functions to request subsets of the information available via XkbGetDeviceInfo.
These convenience functions mirror some of the mask bits. The functions all take an XkbDeviceInfoPtr as
an input argument and operate on the X Input Extension device specified by the device_spec field of the
structure. Only the parts of the structure indicated in the function description are updated. The
XkbDeviceInfoRec structure used in the function call can be obtained by calling XkbGetDeviceInfo or can
be allocated by calling XkbAllocDeviceInfo.
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