NAME
XkbNoteDeviceChanges - Note device changes reported in an
XkbExtensionDeviceNotify event
SYNOPSIS
void XkbNoteDeviceChanges (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
XkbDeviceChangesRec structure, use XkbGetDeviceInfoChanges.
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
XkbGetDeviceInfoChanges(3)