NAME
XkbSelectEventDetails - Selects or deselects for a specific Xkb event
and optionally places conditions on when events of that type are
reported to your client
SYNOPSIS
Bool XkbSelectEventDetails (Display *display, unsigned int device_spec,
unsigned int event_type, unsigned long int bits_to_change,
unsigned long int values_for_bits);
ARGUMENTS
display
connection to the X server
device_spec
device ID, or XkbUseCoreKbd
event_type
Xkb event type of interest
bits_to_change
determines events to be selected / deselected
values_for_bits
1=>select, 0->deselect; for events in bits_to_change
DESCRIPTION
Xkb events are selected using an event mask, much the same as normal
core X events are selected. However, unlike selecting core X events,
where you must specify the selection status (on or off) for all
possible event types whenever you wish to change the selection criteria
for any one event, Xkb allows you to restrict the specification to only
the event types you wish to change. This means that you do not need to
remember the event selection values for all possible types each time
you want to change one of them.
Many Xkb event types are generated under several different
circumstances. When selecting to receive an Xkb event, you may specify
either that you want it delivered under all circumstances, or that you
want it delivered only for a subset of the possible circumstances.
You can also deselect an event type that was previously selected for,
using the same granularity.
Xkb provides two functions to select and deselect delivery of Xkb
events. XkbSelectEvents allows you to select or deselect delivery of
more than one Xkb event type at once. Events selected using
XkbSelectEvents are delivered to your program under all circumstances
that generate the events. To restrict delivery of an event to a subset
of the conditions under which it occurs, use XkbSelectEventDetails.
XkbSelectEventDetails only allows you to change the selection
conditions for a single event at a time, but it provides a means of
fine-tuning the conditions under which the event is delivered.
To select or deselect for a specific Xkb event and optionally place
conditions on when events of that type are reported to your client, use
XkbSelectEventDetails. This allows you to exercise a finer granularity
of control over delivery of Xkb events with XkbSelectEvents.
While XkbSelectEvents allows multiple events to be selected,
XkbSelectEventDetails changes the selection criteria for a single type
of Xkb event. The interpretation of the bits_to_change and
values_for_bits masks depends on the event type in question.
XkbSelectEventDetails changes the Xkb event selection mask for the
keyboard specified by device_spec and the Xkb event specified by
event_type. To turn on event selection for an event detail, set the
bit for the detail in the bits_to_change parameter and set the
corresponding bit in the values_for_bits parameter. To turn off event
detail selection for a detail, set the bit for the detail in the
bits_to_change parameter and do not set the corresponding bit in the
values_for_bits parameter.
If an invalid event type is specified, a BadValue protocol error
results. If a bit is not set in the bits_to_change parameter, but the
corresponding bit is set in the values_for_bits parameter, a BadMatch
protocol error results. If an undefined bit is set in either the
bits_to_change or the values_for_bits parameter, a BadValue protocol
error results.
For each type of Xkb event, the legal event details that you can
specify in the XkbSelectEventDetails request are listed in the chapters
that describe each event in detail.
DIAGNOSTICS
BadMatch A compatible version of Xkb was not available in the
server or an argument has correct type and range, but is
otherwise invalid
BadValue An argument is out of range
SEE ALSO
XkbSelectEvents(3), XkbUseCoreKbd(3)