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'\" t
.\" Copyright 1999 Sun Microsystems, Inc.  All rights reserved.
.\"
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.TH XkbSelectEvents __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
.SH NAME
XkbSelectEvents \-  Selects and / or deselects for delivery of one or more Xkb 
events and has them delivered under all conditions 
.SH SYNOPSIS
.HP
.B Bool XkbSelectEvents
.BI "(\^Display *" "display" "\^,"
.BI "unsigned int " "device_spec" "\^,"
.BI "unsigned long int " "bits_to_change" "\^,"
.BI "unsigned long int " "values_for_bits" "\^);"
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I display
connection to the X server 
.TP
.I device_spec
device ID, or XkbUseCoreKbd
.TP
.I bits_to_change
determines events to be selected / deselected
.TP
.I values_for_bits
1=>select, 0->deselect; for events in bits_to_change
.SH DESCRIPTION
.LP
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. 
.I XkbSelectEvents 
allows you to select or deselect delivery of more than one Xkb 
event type at once. Events selected using 
.I 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 
.I 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.

This request changes the Xkb event selection mask for the keyboard specified by 
.I device_spec.

Each Xkb event that can be selected is represented by a bit in the
.I bits_to_change 
and 
.I values_for_bits 
masks. Only the event selection bits specified by the 
.I bits_to_change 
parameter are affected; any unspecified bits are left unchanged. To turn on 
event selection for an event, set the bit for the event in the 
.I bits_to_change 
parameter and set the corresponding bit in the 
.I values_for_bits 
parameter. To turn off event selection for an event, set the bit for the event 
in the 
.I bits_to_change 
parameter and do not set the corresponding bit in the 
.I values_for_bits 
parameter. The valid values for both of these parameters are an inclusive 
bitwise OR of the masks shown in Table 1. There is no interface to return your 
client's current event selection mask. Clients cannot set other clients' event 
selection masks.

The X server reports the events defined by Xkb to your client application only 
if you have requested them via a call to 
.I XkbSelectEvents 
or 
.I XkbSelectEventDetails. 
Specify the event types in which you are interested in a mask.

Table 1 lists the event mask constants that can be specified with the 
.I XkbSelectEvents 
request and the circumstances in which the mask should be specified.

.TS
c s s
l l l
l l l.
Table 1 XkbSelectEvents Mask Constants
_
Event Mask	Value	Notification Wanted
_
XkbNewKeyboardNotifyMask	(1L<<0)	Keyboard geometry change 
XkbMapNotifyMask	(1L<<1)	Keyboard mapping change 
XkbStateNotifyMask	(1L<<2)	Keyboard state change 
XkbControlsNotifyMask	(1L<<3)	Keyboard control change 
XkbIndicatorStateNotifyMask	(1L<<4)	Keyboard indicator state change 
XkbIndicatorMapNotifyMask	(1L<<5)	Keyboard indicator map change 
XkbNamesNotifyMask	(1L<<6)	Keyboard name change 
XkbCompatMapNotifyMask	(1L<<7)	Keyboard compat map change 
XkbBellNotifyMask	(1L<<8)	Bell 
XkbActionMessageMask	(1L<<9)	Action message 
XkbAccessXNotifyMask	(1L<<10)	AccessX features 
XkbExtensionDeviceNotifyMask	(1L<<11)	Extension device 
XkbAllEventsMask	(0xFFF)	All Xkb events
.TE
 
If a bit is not set in the 
.I bits_to_change 
parameter, but the corresponding bit is set in the 
.I values_for_bits 
parameter, a BadMatch protocol error results. If an undefined bit is set in 
either the 
.I bits_to_change 
or the 
.I values_for_bits 
parameter, a BadValue protocol error results.

All event selection bits are initially zero for clients using the Xkb extension. 
Once you set some bits, they remain set for your client until you clear them via 
another call to 
.I XkbSelectEvents. 

.I XkbSelectEvents 
returns False if the Xkb extension has not been initilialized and True 
otherwise.
.SH "RETURN VALUES"
.TP 15
True
The 
.I XkbSelectEvents 
function returns True if the Xkb extension has been initilialized.
.TP 15
False
The 
.I XkbSelectEvents 
function returns False if the Xkb extension has not been initilialized.
.SH "SEE ALSO"
.BR XkbSelectEventDetails (__libmansuffix__),
.BR XkbUseCoreKbd (__libmansuffix__)